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232 results on '"Hu, Meihua"'

9. One-Step Synthesis of Polydopamine-Coated Dummy Molecularly Imprinted Polymers on the Surface of Fe.sub.3O.sub.4 for Selective Extraction and Enrichment of Aflatoxin B in Foods Prior to High-Performance Liquid Chromatography Detection

Author

Suo, Lili and Hu, Meihua

Subjects
Aflatoxins -- Analysis, High performance liquid chromatography -- Usage, Iron oxides -- Usage, Adsorption -- Analysis, Polymers -- Analysis, Chemical synthesis -- Usage -- Methods, Chemistry
Abstract

A new specific sorbent entitled molecularly imprinted polymer (Fe.sub.3O.sub.4@PDA MIP) was fabricated on the surface of ferroferric oxide nanoparticles with the dummy template of 5,7-dimethoxycoumarin through self-assembly of dopamine which is efficient for recognition and determination of aflatoxin B in food samples coupled with UPLC-FLD with a large volume flow cell. The prepared MIPs were characterized, and the adsorption properties were evaluated. The maximum adsorption capacities were 0.46 mg/g for aflatoxin B1 and 0.047 mg/g for aflatoxin B2. Under optimized conditions, the calibration plots are linear in the range of 0.005-0.5 and 0.001-0.1 ng/mL with LODs of 0.0024 and 0.0004 ng/mL for aflatoxin B1 and aflatoxin B2, respectively. The recoveries from spiked samples are 89.0-105.0% with RSDs of 5.6-7.7% in case of corn, peanut and edible oil. And after 7 cycles, the adsorption capacity of the MIPs did not decrease significantly., Author(s): Lili Suo [sup.1] , Meihua Hu [sup.2] Author Affiliations: (1) grid.507007.5, The collaboration Unit for Field Epidemiology of State Key Laboratory for Infectious Prevention and Control, Jiangxi Provincal Key [...]

Published
2023
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32. Thermoelectric performance of Te composited with FeTe2 and co-doped with Sb and Se.

Author

Lu, Weikang, Li, Shangsheng, Zhou, Xubiao, Zhu, Hongyu, Hu, Meihua, Qin, Bingke, and Su, Taichao

Abstract

In recent years, the element semiconductor Te has been considered as a potential thermoelectric material in the middle temperature region due to its excellent thermoelectric performance and high stability. However, it is necessary to dop with high toxic As element or low toxic Bi or Sb under high pressure conditions to obtain a moderate carrier concentration. In this study, we synthesized Sb-Se doped and FeTe2 composited Te under lower pressure conditions. The results show that the solid solubility of Fe in Te does not exceed 5 at%. After exceeding its solid solubility, Fe is precipitated in the form of FeTe2. The electrical transport properties and thermal conductivity of Te were tuned effectively by FeTe2 composite and Sb doping. The maximum ZT value of the sample with the composition of Fe0.1Te0.9Sb0.003 reaches 0.65 at 607 K, which is much higher than that of the pristine Te. The thermal conductivity was further reduced by Se doping. Thereby, the ZT value of the sample Fe0.1Te0.872Sb0.003Se0.025 was enhanced to 0.76 at 580 K. These results show that combining with doping and composite can improve the thermoelectric properties of Te effectively. [ABSTRACT FROM AUTHOR]

Published
2024
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35. High-efficiency nickel recovery from spent electroless nickel plating solution: effective degradation of high-concentration nickel complexes to form a nickel ferrite nanomaterial viaFe3O4catalytic oxidationElectronic supplementary information (ESI) available. See DOI: https://doi.org/10.1039/d3en00876b

Author

Lu, Kaibin, Qin, Jiemin, Hu, Meihua, Hu, Limeng, Mao, Minlin, Li, Xiaoqin, Lin, Zhang, and Liu, Weizhen

Abstract

The widespread use of electroless nickel plating inevitably leads to substantial discharge of spent electroless nickel plating solution (SENPS), which poses a serious threat to the environment. It remains highly challenging to efficiently treat SENPS, as it mostly contains organic nickel complexes that have high stability and low biodegradability. In this work, we verified that nickel mostly existed as nickel lactate and Ni–EDTA in SENPS, and then developed a highly effective hydrothermal method to oxidatively degrade these complexes in an alkaline environment containing Fe3O4, to ultimately recover Ni in the form of NiFe2O4as a valuable nanomaterial available for use in electrodes and catalysts. Under optimal conditions, this method could attain a remarkable Ni removal efficiency of 99.99%, and the residual Ni content was only 0.98 mg L−1from an initial concentration of 12 448.8 mg L−1. Mechanistic investigations revealed that in an alkaline environment, nickel lactate was transformed by OH−into Ni(OH)3−and lactate, and Ni–EDTA was converted to the much less stable NiOHEDTA3−. Hydroxyl radicals generated by the reaction between active oxygen groups and Fe3O4could then degrade the NiOHEDTA3−complex to release Ni2+, and NiFe2O4was formed after Ni2+entered the octahedral lattice of Fe3O4and replaced Fe2+. This work presents a novel approach for treating SENPS, which serves as an example of recovering heavy metals from their organic complexes to create useful nanomaterial resources.

Published
2024
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48. Improve thermoelectric performance of Bi2Te3 by incorporation of Mo2C MXene with N-type conductivity.

Author

Guo, Yitong, Du, Jingyang, Hu, Meihua, Wei, Bin, Su, Taichao, and Zhou, Aiguo

Abstract

In this paper, the thermoelectric (TE) performance of Bi2Te3 was improved by the incorporation of Mo2C MXene, which is a novel two-dimensional material with moderate TE performance. The TE properties of Mo2C MXene were characterized from bulk samples bonded with 5 wt% Al sintered by spark plasma sintering (SPS) at 623 K for 6 min. Due to the very weak TE performance of Al, the performance of Mo2C MXene/Al composite reflects that of Mo2C MXene. It is an N-type conductor with the Seebeck coefficient of − 9.25 µV/K at 600 K. This is the first report to characterize the TE performance of Mo2C MXene bulk samples. Thereafter, Bi2Te3/Mo2C MXene composite powders were prepared from Mo2C MXene powers and precursors of Bi2Te3 by hydrothermal method at 453 K for 24 h. The bulk samples of Bi2Te3 incorporated with Mo2C MXene was obtained by SPS at 523 K for 7 min. The composites are N-type conductors. The electrical conductivity was remarkably increased with the content of Mo2C MXene, while the thermal conductivity slightly decreased. The sample with 5 vol% Mo2C MXene showed the optimal thermoelectric properties, and its ZT value was 0.26 at 473 K. At 450 K, the ZT value (~ 0.25) of that sample was 78.6% higher than that of Bi2Te3 (~ 0.14). This is the first report on regulating TE performance by the incorporation of Mo2C MXene, a 2D material with intrinsic TE performance. [ABSTRACT FROM AUTHOR]

Published
2023
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