Search

As key regulators, long non-coding RNAs (lncRNAs) play a crucial role in the ruminant mammary gland. However, the function of lncRNAs in milk fat synthesis from dairy cows is largely unknown. In this study, we used the weighted gene co-expression network analysis (WGCNA) to comprehensive analyze the expression profile data of lncRNAs from the group's previous Illumina PE150 sequencing results based on bovine mammary epithelial cells from high- and low-milk-fat-percentage (MFP) cows, and identify core_lncRNAs significantly associated with MFP by module membership (MM) and gene significance (GS). Functional enrichment analysis (Gene Ontology, Kyoto Encyclopedia of Genes and Genomes) of core_lncRNA target genes (co-localization and co-expression) was performed to screen potential lncRNAs regulating milk fat metabolism and further construct an interactive regulatory network of lipid metabolism-related competing endogenous RNAs (ceRNAs). A total of 4876 lncRNAs were used to construct the WGCNA. The MEdarkturquoise module among the 19 modules obtained was significantly associated with MFP (r = 0.78, p-value0.05) and contained 64 core_lncRNAs (MM 0.8, GS 0.4). Twenty-four lipid metabolism-related lncRNAs were identified by core_lncRNA target gene enrichment analysis. TCONS_00054233, TCONS_00152292, TCONS_00048619, TCONS_00033839, TCONS_00153791 and TCONS_00074642 were key candidate lncRNAs for regulating milk fat synthesis. The 22 ceRNAs most likely to be involved in milk fat metabolism were constructed by interaction network analysis, and TCONS_00133813 and bta-miR-2454-5p were located at the network's core. TCONS_00133813_bta-miR-2454-5p_TNFAIP3, TCONS_00133813_bta-miR-2454-5p_ARRB1 and TCONS_00133813_bta-miR-2454-5p_PIK3R1 are key candidate ceRNAs associated with milk fat metabolism. This study provides a framework for the co-expression module of MFP-related lncRNAs in ruminants, identifies several major lncRNAs and ceRNAs that influence milk fat synthesis, and provides a new understanding of the complex biology of milk fat synthesis in dairy cows.

The central role of tropical sea surface temperature (SST) variability in modulating Northern Hemisphere (NH) extratropical climate has long been known. However, the prevailing pathways of teleconnections in observations and the ability of climate models to replicate these observed linkages remain elusive. Here, we apply maximum covariance analysis between atmospheric circulation and tropical SST to reveal two co-existing tropical-extratropical teleconnections albeit with distinctive spatiotemporal characteristics. The first mode, resembling the Pacific-North American (PNA) pattern, favors a Tropical-Arctic in-phase (warm-Pacific-warm-Arctic) teleconnection in boreal spring and winter. The second mode, predominant in summer and autumn, is manifested as an elongated Rossby-wave train emanating from the tropical eastern Pacific that features an out-of-phase relationship (cold-Pacific-warm-Arctic) between tropical Pacific SST and temperature variability over the Arctic. This Pacific-Arctic teleconnection (PARC) mode partially explains the observed summertime warming around the Arctic. The reliability of climate models to replicate these leading teleconnections is of primary interest in this study to improve decadal prediction on regional climate. While climate models participating in CMIP6 appear to successfully simulate the PNA mode and its temporal characteristics, the majority of models’ skill in reproducing the PARC mode is obstructed by apparent biases in simulating low-frequency SST and rainfall variability over the tropical eastern Pacific and the summer climatological mean flow over the North Pacific. Considering the contribution of the PARC mode in shaping low frequency climate variations over the recent decades from the tropics to the Arctic, improving models’ capability to capture the PARC mode is essential to reduce uncertainties associated with decadal prediction and climate change projection over the NH.

Consistent with the northward migration of the annual mean latitude of tropical cyclone (TC) lifetime maximum intensity (LMI), the basin-wide mean location of TC formation shifted northward in the western North Pacific (WNP) basin over the past four decades. Whether such a shift was related to the anthropogenic influence is important to understanding the response of TC activity to climate change. Instead of detecting the effects of individual environmental factors on this shift, here we focus on the interdecadal variability of the monsoon trough (MT), within which most TCs in the WNP basin occur, and its roles in the shift of the basin-wide mean location of TC formation using 60-year reanalysis data. Interdecadal variations of the MT exhibit two main modes: one associated with the Pacific decadal oscillation (PDO) and the other associated with the interdecadal Pacific oscillation (IPO). In addition, the north–south shift of the mean latitude of TC formation is accompanied by east–west extension of the tropical upper tropospheric trough (TUTT) and the tropical eastern Pacific cold tongue indicated by the east–west contrast of sea surface temperature (SST) anomalies. The poleward shift of the mean TC formation latitude is closely associated with the IPO mode of the MT. The westward retreat of the northwest-to-southeast-oriented MT and the accompanied westward extension of the TUTT reduced TC formation in the eastern part of the WNP basin when the cold tongue shifted westward. It is indicated that the observed poleward shift of TC formation was mainly attributed to natural variability in recent decades.

In the past 40 years, the global annual mean surface temperature has experienced a nonuniform warming, differing from the spatially uniform warming simulated by the forced responses of large multimodel ensembles to anthropogenic forcing. Rather, it exhibits significant asymmetry between the Arctic and Antarctic, with intermittent and spatially varying warming trends along the Northern Hemisphere (NH) midlatitudes and a slight cooling in the tropical eastern Pacific. In particular, this “wavy” pattern of temperature changes over the NH midlatitudes features strong cooling over Eurasia in boreal winter. Here, we show that these nonuniform features of surface temperature changes are likely tied together by tropical eastern Pacific sea surface temperatures (SSTs), via a global atmospheric teleconnection. Using six reanalyses, we find that this teleconnection can be consistently obtained as a leading circulation mode in the past century. This tropically driven teleconnection is associated with a Pacific SST pattern resembling the interdecadal Pacific oscillation (IPO), and hereafter referred to as the IPO-related bipolar teleconnection (IPO-BT). Further, two paleo-reanalysis reconstruction datasets show that the IPO-BT is a robust recurrent mode over the past 400 and 2000 years. The IPO-BT mode may thus serve as an important internal mode that regulates high-latitude climate variability on multidecadal time scales, favoring a warming (cooling) episode in the Arctic accompanied by cooling (warming) over Eurasia and the Southern Ocean (SO). Thus, the spatial nonuniformity of recent surface temperature trends may be partially explained by the enhanced appearance of the IPO-BT mode by a transition of the IPO toward a cooling phase in the eastern Pacific in the past decades.

Two-dimensional titanium carbide (MXene) with an adjustable bandgap (0.92–1.75eV), excellent structural stability, high conductivity and hydrophilicity has always been a hotspot in the field of environmental photocatalysis. However, the rapid recombination of light-excited carriers of a single photocatalytic material decreases quantum efficiency and photocatalytic performance. The modification of MXene could overcome these problems to improve photocatalytic properties. Among various improvement strategies, the composition of MXene heterostructure and Schottky junction is an effective and straightforward strategy for adjusting electronic structure and accelerating photocatalytic performance. This review aims to design typical, cost-effective heterojunctions and Schottky junctions and their progress, mechanisms, and trends in environmental organic pollutants' degradation. This review detailed the heterogeneous catalytic mechanism of MXene-based photocatalysts for the degradation of organic pollutants. It is discussed the way to improve the photocatalytic performance of MXene by constructing heterojunction and Schottky junction. The surface properties, catalyst performance and pollution management of various MXene-based catalysts were compared, and then some dilemmas and application strategies of MXene development were analyzed in depth. This review can open up ideas for new approaches and provide valuable clues for designing MXene as a cocatalyst to develop more effective photocatalysts for practical application in environmental pollution management.

There is existing evidence that elevated homocysteine (Hcy) levels are risk factors for some neurodegenerative disorders. The pathogenesis of neurological diseases could be contributed to excessive cell dysfunction and death caused by defective DNA damage response (DDR) and accumulated DNA damage. Hcy is a neurotoxic amino acid and acts as a DNA damage inducer. However, it is not clear whether Hcy participates in the DDR. To investigate the effects of Hcy on DNA damage and the DDR, we employed mitomycin C (MMC) to cause DNA damage in NE4C murine neural stem cells (NSCs). Compared to treatment with MMC alone, we found that co-treatment with MMC and Hcy worsened DNA damage and increased death in NE4C cells. Intriguingly, in this DNA damage model mimicked by MMC, immunoblotting results showed that the monoubiquitination levels of Fanconi anemia complementation group I (Fanci) and Fanconi anemia complementation group D2 (Fancd2) were decreased to about 60.3% and 55.7% by supplementing cell culture medium with Hcy, indicating Hcy inactivates the function of Fanci and Fancd2 in DNA damage conditions. Given Breast Cancer 1 (BRCA1) is an important downstream of FANCD2, we next detected the interaction between Fancd2 and Brca1 in NE4C cells. Compared to treatment with MMC alone, the Fancd2-Brca1 interaction and the amount of Brca1 on chromatin were decreased when cells were co-exposed to MMC and Hcy, suggesting Hcy could impair the Fanconi anemia (FA)/Brca1 pathway. Taken together, our study demonstrates that Hcy may enhance cell death, which contributes to the accumulation of DNA damage and promotion of hypersensitivity to cytotoxicity by impairing the FA/Brca1 pathway in murine NSCs in the presence of DNA damage.

Milk fat is the most important and energy-rich substance in milk, and its content and composition are important reference elements in the evaluation of milk quality. However, the current identification of valuable candidate genes affecting milk fat is limited. IlluminaPE150 was used to sequence bovine mammary epithelial cells (BMECs) with high and low milk fat rates (MFP), the weighted gene co-expression network (WGCNA) was used to analyze mRNA expression profile data in this study. As a result, a total of 10,310 genes were used to construct WGCNA, and the genes were classified into 18 modules. Among them, violet (r = 0.74), yellow (r = 0.75) and darkolivegreen (r = − 0.79) modules were significantly associated with MFP, and 39, 181, 75 hub genes were identified, respectively. Combining enrichment analysis and differential genes (DEs), we screened five key candidate DEs related to lipid metabolism, namely PI4K2A, SLC16A1, ATP8A2, VEGFD and ID1, respectively. Relative to the small intestine, liver, kidney, heart, ovary and uterus, the gene expression of PI4K2A is the highest in mammary gland, and is significantly enriched in GO terms and pathways related to milk fat metabolism, such as monocarboxylic acid transport, phospholipid transport, phosphatidylinositol signaling system, inositol phosphate metabolism and MAPK signaling pathway. This study uses WGCNA to form an overall view of MFP, providing a theoretical basis for identifying potential pathways and hub genes that may be involved in milk fat synthesis.

Milk fat is the most important and energy-rich substance in milk and plays an important role in the metabolism of nutrients during human growth and development. It is mainly used in the production of butter and yogurt. Milk fat not only affects the flavor and nutritional value of milk, but also is the main target trait of ruminant breeding. There are many key genes involve in ruminant milk fat synthesis, including ACSS2, FASN, ACACA, CD36, ACSL, SLC27A, FABP3, SCD, GPAM, AGPAT, LPIN, DGAT1, PLIN2, XDH, and BTN1A1. Taking the de novo synthesis of fatty acids (FA) and intaking of long-chain fatty acids (LCFA) in blood to the end of lipid droplet secretion as the mainline, this manuscript elucidates the complex regulation model of key genes in mammary epithelial cells (MECs) in ruminant milk fat synthesis, and constructs the whole regulatory network of milk fat synthesis, to provide valuable theoretical basis and research ideas for the study of milk fat regulation mechanism of ruminants.

To obtain low k materials with good comprehensive performances, fluorinated poly(aryl ether nitrile)s containing pendant cyclohexyl groups (FCPEN) have been designed and synthesized via nucleophilic aromatic substitution polymerization. The polymer exhibits excellent dielectric properties with a dielectric constant of 2.96 and a dielectric loss of 3.95 × 10-3 at at 1 MHz. Besides, FCPEN displays satisfactory thermostability with a 5% weight loss temperature (T d5%) of 489 °C and a glass transition temperature (T g) of 191 °C. The resultant film shows good mechanical performance and optical transmittance. The outstanding comprehensive properties indicate that FCPEN is a promising low k material for the fabrication of microelectronic devices used in 5G communication.

Polyarylene ether nitrile (PEN) is a new type of super engineering polymer with excellent high-temperature resistance, radiation resistance, good electrical insulation, and mechanical properties. In this work, boron nitride (BN) and copper phthalocyanine (CuPc) hybrids were integrated as fillers, which were further dispersed into PEN matrix by solution casting method to obtain a series of PEN composite films. The successful preparation of hybrid fillers was proved by means of X-ray photoelectron spectroscopy and scanning electron microscopy. The test results of the dielectric properties of the composite films show that the CuPc-BN/PEN films exhibit good dielectric properties. When the mass fraction of filler reaches 10 wt%, the dielectric constant of the PEN composite film increases by 17%. This study shows that the composites composed of modified BN and PEN has excellent dielectric properties and has great application potential in heat-resistance thin-film capacitors.

Background: Long noncoding RNAs (lncRNAs) play an important regulatory role in various biological processes as a key regulatory factor. However, there are largely unknown for the function and expression profile of lncRNAs in milk fat synthesis of dairy cows. Results: In this study, RNA sequencing (RNA-seq) was used to research the whole genome expression of lncRNAs and mRNA transcripts in bovine mammary epithelial cells (BMECs) of dairy cows with high and low milk fat percentage (MFP), and joint analysis was carried out. We identified a total of 47 differentially expressed genes (DEGs) and 38 differentially expressed lncRNAs (DELs, Padj < 0.05), 11 candidate DEGs that may regulate milk fat metabolism were screened by enrichment analysis. Downregulated differential gene ENPP2 and upregulated differential gene BCAT1 are more likely to participate in the milk fat metabolism, and its function needs further experiments verification. The enrichment analysis of target genes predicted by DELs identified 7 cis (co-localization) and 10 trans (co-expression) candidate target genes related to milk lipid metabolism, corresponding to a total of 18 DELs. Among them, the targeting relationship between long intervening/intergenic noncoding RNA (lincRNA) TCONS_00082721 and FABP4 gene that predicts milk fat metabolism by co-localization and co-expression is worthy of attention. Based on the expression information of DELs, differential microRNAs (miRNAs), and lipid metabolism-related target genes, 156 competing endogenous RNAs (ceRNAs) interaction regulation networks related to milk fat metabolism were constructed. The regulatory network centered on miR-145 will be the focus of subsequent experimental research. The ceRNAs regulatory network related to TCONS_00082721 and TCONS_00172817 are more likely to be involved in milk fat synthesis. Conclusions: These results will provide new ways to understand the complex biology of dairy cow milk fat synthesis and provide valuable information for the breed improvement of Chinese Holstein cattle.

In the study, the reduced graphene oxide/graphitic Bi12O17Cl2–TiO2 heterojunctions sheet membrane(RGO/PDA/Bi12O17Cl2–TiO2) was fabricated by the dopamine modification and assembling the RGO/PDA/Bi12O17Cl2–TiO2 composites on the surface of commercial CA(cellulose acetate) membrane to degrade methylene blue (MB) and p-chlorophenol (4-CP) to harmless products. These membrane materials were comprehensively characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and UV–vis diffuse reflectance spectra (DRS). The results showed that RGO/PDA/Bi12O17Cl2–TiO2 nanofiber membrane exhibited extremely high degradation performance with a good distribution of RGO/PDA/Bi12O17Cl2–TiO2 on the CA nanofiber membrane surface. Besides, the complete photodegradation of 100 mL MB (15 mg L−1) solution and 100 mL 4-CP (15 mg L−1) solution with artificial visible-light was achieved after 100 min and 160 min, respectively. The RGO/PDA/Bi12O17Cl2–TiO2-CA composite membrane revealed the ability of continuous and simultaneous flow-through separation of oil/water emulsion and degradation of soluble organic dye under visible-light irradiation in a short time. Moreover, the nanofiber membranes exhibited excellent stability and reusability for MB-containing oil–water mixed emulsion separation has great potential to be applied in industrial application.

Heavy metals in the water environment seriously threaten human health and the ecological environment. As an effective method for removing heavy metals in water, adsorption has attracted wide attention. Traditional LDHs materials are difficult to recover as adsorbents. This study provides a new type of adsorption material for Ni/Fe-LDH coated with sodium alginate(SA) synthesized by a simple hydrothermal method and treated with NaOH. Obtain the alkalized adsorption material alk-Ni/Fe-LDH-SA. It was characterized by SEM, XRD, FTIR, TGA and XPS, and its adsorption effect on Ni(II) and Cu(II) was studied. The experimental results show that the prepared Ni/Fe-LDH-SA adsorbent has an adsorption capacity of 182.8 mg/g for Ni2+ and 196.2 mg/g for Cu2+ at 25℃. It has good performance when pH ≥ 7, and after four cycles, the removal rate of the two ions remains above 80%. The analysis mechanism shows that the removal process is mainly through physical adsorption precipitation, electrostatic adsorption, ion exchange, and chelation. Compared with traditional adsorbents, the adsorbent prepared in this study is easy to be recycled and reused, and has potential application value to other heavy metal ions. It is a promising adsorbent material.

Heavy metal pollution is highly toxic and persistent, posing a severe threat to human health, agriculture, and the safe environment. Therefore, there is an urgent need for fast and efficient heavy metal removal technology to deal with emergency response to heavy metal leakage. In recent years, the development of a unique layered double hydroxide material has attracted widespread attention in sewage treatment. Due to these fundamental scientific issues, the general concern about environmental pollution management of LDH-based materials, and the recent significant developments in this field, it is necessary to conduct a thematic review. This article summarizes 474 related articles published since 2005 and outlines functionalized layered double hydroxide (LDH) research status as heavy metal adsorption materials. In addition, there is still a lack of reviews on the adsorption characteristics, interaction mechanism, and application of LDHs-based nanomaterials in heavy metal removal. Here, the primary purpose of this article is to systematically summarize LDHs-based materials and their applications in removing heavy metals from aqueous solutions ( Figure 1 ). First, we will focus on its preparation and modification methods to understand LDH intuitively. Subsequently, the effects of different environmental conditions on factors such as pH, temperature, and contact time were summarized. Finally, the interaction mechanism between LDHs composites and heavy metals is briefly described, and a quick conclusion is given.

Railway freight loading and reinforcement plays an essential role in transportation security. China has an enormous spread of freight operation, however, a great number of freight stations still use manual drawing and calculation based on the staff's experience, which causes poor practicability and low efficiency. In this research, a method of generating schemes based on Case-based Reasoning (CBR) and extension theory was proposed. The study combines intelligent algorithms and theoretical knowledge in railway freight loading and reinforcement, which can implement auto-matching and generation of loading and reinforcement schemes under complex loading scenarios. The reliability of the scheme is also verified through an example. The research simplifies the generation process of loading and reinforcement scheme. It has a great significance in increasing freight operation efficiency and developing intelligent control technology.

Background: Improving broiler production efficiency and delivering good quality chicken has become an exciting area of research. Many factors affect the quality of chicken, and the IMF content is one of the critical factors determining the quality of chicken. At present, there are many reports on the molecular mechanism of IMF-specific deposition in chicken; however, only a few reports discuss the specific deposition of IMF in different parts of a chicken.Methods: In order to analyze the molecular mechanism of IMF specific deposition in different parts of chickens, the present study has selected 180-days old Jingyuan chicken breast and leg muscles as the research materials, using proteomics technology and screening of PRM protein quantitative detection methods, identification and quantitative verification of proteins that control the IMF-specific deposition in the leg muscles and breast muscles of Jingyuan chickens. The protein was analyzed by advanced bioinformatics using GO, KEGG, R language, Gallus_gallus_UniPort, and other biological software, including tools and related databases for screening and identification.Results: By screening and identifying LC-MS/MS mass spectrometry data and comparing it with the Gallus_gallus_UniPort database, a total of 1940.0 proteins were screened and identified, of which 1317.0 proteins were quantified. Compared with the breast muscles, there are 190 differentially expressed proteins between leg and breast muscles. In the leg muscles, 121 proteins are up-regulated, whereas 69 are down-regulated. Gene Ontology (GO) function annotation and enrichment analysis were done for 190 differential proteins. These proteins participate in a biological process (BP), cellular component (CC), and molecular function (MF) pathways. However, a total of 286 signaling pathways involved 190 differential proteins using a KEGG pathway. Significantly different proteins between the leg and breast muscles were primarily enriched with gga00500Starchandsucrosemetabolism, gga00071 Fattyaciddegradation, gga01212Fattyacidmetabolism, gga03320PPAR signaling pathway. PRM was used to confirm and identify the differential proteins by screening quantitatively; 10 of them are related to fat deposition, namely E1BTT4, E1C0Q5 (ACAT1), F1NC38 (ACADL), Q5F420 (ACSL1), A0A1D5P3S9 (ECI1), Q5ZL56 (ACADS), F1NUQ3 (FABP3), A0A1D5PL36 (ACAA2), F1NR44 (ECHS1), Q5ZIR7 (FABP5) using STRING and Cytoscape software to analyze the network interactions of 10 differentially expressed proteins, resulting in 19 network interaction paths.Conclusion: We used modern omics technology, omics software, and related databases to screen and identify 3 key signal pathways, including 10 key functional proteins that control IMF-specific deposition in different parts of chickens. At the same time, the present results can be used for different parts of the chicken. Specifically, the molecular mechanism of IMF-specific deposition has been explained, and a key regulatory role is played by the network interaction analysis of proteins that control IMF-specific deposition in different parts of chickens. The results have a scientific value and theoretical significance for improving chicken quality and molecular breeding of high-quality local chicken breeds.

Background Hepatocellular carcinoma (HCC) is one of the most lethal and malignant tumours worldwide. New therapeutic targets for HCC are urgently needed. CYCLOPS (copy number alterations yielding cancer liabilities owing to partial loss) genes have been noted to be associated with cancer-targeted therapies. Therefore, we intended to explore the effects of the CYCLOPS gene RBM17 on HCC oncogenesis to determine if it could be further used for targeted therapy. Methods We collected data on 12 types of cancer from the Cancer Genome Atlas (TCGA) and Gene Expression Omnibus (GEO) queries for comparison with adjacent non-tumour tissues. RBM17 expression levels, clinicopathological factors and survival times were analysed. RNAseq data were downloaded from the Encyclopaedia of DNA Elements database for molecular mechanism exploration. Two representative HCC cell models were built to observe the proliferation capacity of HCC cells when RBM17 expression was inhibited by shRBM17. Cell cycle progression and apoptosis were also examined to investigate the pathogenesis of RBM17. Results Based on 6,136 clinical samples, RBM17 was markedly overexpressed in most cancers, especially HCC. Moreover, data from 442 patients revealed that high RBM17 expression levels were related to a worse prognosis. Overexpression of RBM17 was related to the iCluster1 molecular subgroup, TNM stage, and histologic grade. Pathway analysis of RNAseq data suggested that RBM17 was involved in mitosis. Further investigation revealed that the proliferation rates of HepG2 (P = 0.003) and SMMC-7721 (P = 0.030) cells were significantly reduced when RBM17 was knocked down. In addition, RBM17 knockdown also arrested the progression of the cell cycle, causing cells to halt at the G2/M phase. Increased apoptosis rates were also found in vitro. Conclusion These results suggest that RBM17 is a potential therapeutic target for HCC treatment.

Ti3C2 MXene contains suitable elements that are effective for photocatalysis, but it is usually not directly used for photocatalysis, which hinders its application in photocatalytic water treatment. In this work, we used the solvothermal method to grow MOF (Fe) in situ on Ti3C2 MXene to construct a composite schottky photocatalytic adsorbent. The morphology of the material is characterized by XRD, SEM, XPS, etc. The adsorption kinetic model and photocatalytic performance of the material were studied. The introduction of MXene avoids the agglomeration of MOF, increases the effective area of the composite material, and acts as a photo-generated electron trap in the photocatalytic process to enhance the charge separation efficiency of MOF. 10 mg composite material can remove more than 90% of MB (50 ppm) within 30 min, and remove 83.41% RhB (25 ppm) and 44.26% MO (20 ppm) within 120 min. In the case of a small amount of use, it shows good adsorption and photodegradation properties to a variety of dyes. Based on the experimental results, a dye removal mechanism based on adsorption performance and schottky knot synergistic Fenton effect is proposed. Its application can be used to eliminate and degrade pollutants in water.

In order to effectively solve the two major problems of photocatalyst recovery and membrane fouling, this research combines photocatalyst and membrane separation technology. In this study, the NH2-MIL-88B(Fe)/CDs@GO material with good photocatalytic properties was synthesized by hydrothermal method and mechanical stirring, and the photocatalytic membrane was obtained by vacuum filtration. The results show that the NH2-MIL-88B(Fe)/CDs@GO membrane can effectively intercept and degrade methylene blue (MB). After 10 cycles, the rejection rate of MB can still reach 99.5%, which is about 2.5 times of pure GO membrane (40%). After 15 min of visible light irradiation, the Flux recovery rate (FRR) of NH2-MIL-88B(Fe)/CDs@GO membrane can reach 95%, and the antifouling performance is excellent. In this study, the composite photocatalytic membrane shows excellent stability, photocatalytic performance and self-cleaning property, which is conducive to widening the application prospect of wastewater treatment.

A novel visible-light-driven uniform Schottky junction MXene/Ag2S catalyst is constructed by chemical deposition and electrostatically driven self-assembly to deposit Ag2S 3D MXene gel’s surface. In this study, various characterization tests show that MXene/Ag2S-2 photocatalyst has excellent visible light absorption performance under visible light (>420 nm). To explore the source of the excellent charge separation performance of Schottky junction, possible charge transfer mechanisms of Schottky junction, and the synergistic effect of silver ion plasmon resonance effect are proposed. We proved the charge transfer mechanism of the Schottky junction and also captured the active species capture experiments. It can be speculated that all active species affect the photocatalytic reaction in the order of O2− > e− > h+ > OH. Simultaneously, the photocatalytic system would have a small amount of silver ion reduction in the plasmon resonance effect during the photocatalysis process, which can be synergistic with the Schottky junction. Besides, the Schottky junction MXene/Ag2S has relatively stable photocatalytic performance and recovery capability. The current work demonstrates a mild, feasible, low-cost all-solid-state Schottky junction synthesis method to improve pollutants’ photocatalytic ability.

The high recombination rate of Bi12O17Cl2 carrier and the limitation of visible light absorption of TiO2 seriously hinder the application of photocatalytic water treatment pollution. In this work, we grow Fe2O3 and Fe2TiO5 uniformly in situ on TiO2–Bi12O17Cl2 (hydrothermally constructed) heterojunction nanomaterials by the ion exchange method. Thus constructing a kind of three-heterojunction composite photocatalyst. XRD, SEM, XPS and other characterization tests were performed on the product to show the sample's morphology, composition, and photoelectric properties. The prepared photocatalyst induces photoelectrons under visible light and shows excellent photodegradation mineralization properties for methylene blue. Besides, the catalyst has cycle practicability and stability. Finally, through the valence band theory and the active species capture experiment, the degradation mechanism of the heterojunction's synergistic effect and the Fenton effect is proposed. The construction of nanocomposite provides a promising photocatalytic strategy for the Fenton reaction system based on heterojunction.