18 results on '"Qirong WU"'
Search Results
2. Steel slag as a potential adsorbent for efficient removal of Fe(II) from simulated acid mine drainage: adsorption performance and mechanism
- Author
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Cunfang Lu, Xuejun Quan, Haixing Chang, Qirong Wu, Duanning Cao, and Mingyuan Yang
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Materials science ,Health, Toxicology and Mutagenesis ,Metal ions in aqueous solution ,Enthalpy ,Industrial Waste ,General Medicine ,Hydrogen-Ion Concentration ,Acid mine drainage ,Pollution ,Endothermic process ,Kinetics ,Adsorption ,Chemical engineering ,Steel ,Chemisorption ,Metals, Heavy ,Environmental Chemistry ,Freundlich equation ,Ferrous Compounds ,Prospective Studies ,Leachate ,Water Pollutants, Chemical - Abstract
Acid mine drainage is an extraordinarily acidic and highly heavy metal ion-contaminated leachate, seriously threatening the environment. In this work, an industrial solid waste of steel slag is the adsorbent to remediate the simulated acid mine drainage containing a large amount of Fe(II) ions. Due to the excellent physicochemical properties and structures, steel slag exhibited remarkable Fe(II) removal performance. Its maximum removal efficiency was up to 100%. The initial pH, the dosage and particle size of steel slag, and initial concentration of heavy metal ions on Fe(II) removal efficiency were determined. The pseudo-second-order model and Freundlich isotherm model well described the adsorption behavior of steel slag, implying that the adsorption of Fe(II) by steel slag was mainly multilayer chemisorption. The thermodynamic study demonstrated that the adsorption process was endothermic and spontaneous; the enthalpy change was calculated to equal 91.21 kJ/mol. Mechanism study showed that the entire removal process of Fe(II) by steel slag was completed by electrostatic adsorption, chemical precipitation, and surface complexation in cooperation, and the chemical precipitation was the dominant mechanism. Meaningfully, this study provides a valuable strategy and path for engineering applications of AMD remediation by steel slag, which is prospective as an ideal candidate for Fe(II) ions elimination, inspiring the future development of "Treating the wastes with wastes." more...
- Published
- 2021
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Catalog
3. Influence of slab structure on the performance of bamboo based concrete formwork
- Author
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Cai Liu, Jinguo Lin, Xin Guan, Mengzhu Han, Xiao-Lian Wu, and Qirong Wu
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Bamboo ,Environmental Engineering ,Materials science ,business.industry ,Middle layer ,Slab ,Formwork ,Bioengineering ,Structural engineering ,business ,Porosity ,Waste Management and Disposal ,Building construction - Abstract
To reduce the density of bamboo-based concrete formwork on the premise of meeting the performance requirements, the bamboo was first treated by cold plasma, and then by increasing the distance between the adjacent bamboo strips of the radial bamboo curtain in the middle layer, the internal porosity was increased. The production of lightened bamboo based concrete formwork, which meets China’s forestry industry standards, was achieved. Four groups of bamboo-based concrete formworks with different slab structures were designed. The key results showed that slab structures have an extremely significant effect on the density, MOR, MOE, IB, and TS of the bamboo-based concrete formwork. A group of optimal slab structures was obtained by comparing their physical and mechanical properties (1st and 9th floor-phenolic resin impregnated paper, 2nd and 8th floor-bamboo mat, 3rd and 7th floor-tangential bamboo curtain, 4th and 6th floor-radial spaced bamboo curtain). Based on the required physical and mechanical properties, its density was 0.62 g·cm-3, which was 27.1% lower than that of traditional bamboo plywood template (0.85 g·cm-3) circulating on the current market. This lightened BBCF can save raw materials, facilitate transportation and reduce labor intensity in the application process so that it will be widely used in building construction. more...
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- 2020
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4. Dynamics adsorption of the enhanced <scp> CH 4 </scp> recovery by <scp> CO 2 </scp> injection
- Author
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Qirong Wu, Shuo Duan, and Min Gu
- Subjects
Environmental Engineering ,Chemistry ,General Chemical Engineering ,Analytical chemistry ,Fraction (chemistry) ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Mole fraction ,Adsorption ,020401 chemical engineering ,Desorption ,Phase (matter) ,Gravimetric analysis ,Stage (hydrology) ,0204 chemical engineering ,0210 nano-technology ,Selectivity ,Biotechnology - Abstract
The dynamic adsorption isotherms of CO2-EGR were measured by using a Intelligent Gravimetric Analysis system.In the beginning stage of CO2 injection, all the injected CO2 enters into the adsorbent and the mole fraction of CH4 (yCH4) keeps 1.0. The CH4 recovery factor (RCH4) increases. The during of this stage (tcd) depends on the selectivity of CO2 over CH4 ( SCO2/CH4). A adsorbent with large SCO2/CH4 has long tCD. When SCO2/CH4 is greater than 1.0, CO2 reduces the fraction of CH4 in the adsorbed phase (xCH4) and more CH4 is driven out. In the second stage,the injected CO2 competes with CH4 for adsorption. The cumulative RCH4 of this stage is much larger than that of the initial stage. However, yCH4 decrease sharply. pCH4 in the whole CO2 injection is always larger than that before CO2 injection, suggesting CH4 desorption results from the displacement by CO2 rather than from pressure depletion. more...
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- 2021
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5. Dynamics adsorption of the enhanced CH4 recovery by CO2 injection
- Author
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Shuo Duan, Min Gu, and Qirong Wu
- Subjects
Adsorption ,Chemistry ,Desorption ,Phase (matter) ,Analytical chemistry ,Gravimetric analysis ,Fraction (chemistry) ,Stage (hydrology) ,Mole fraction ,Selectivity - Abstract
The dynamic adsorption isotherms of CO2-EGR were measured by using a Intelligent Gravimetric Analysis system.In the beginning stage of CO2 injection, all the injected CO2 enters into the adsorbent and the mole fraction of CH4 (yCH4) keeps 1.0. The CH4 recovery factor (RCH4) increases. The during of this stage (tcd) depends on the selectivity of CO2 over CH4 ( SCO2/CH4). A adsorbent with large SCO2/CH4 has long tCD. When SCO2/CH4 is greater than 1.0, CO2 reduces the fraction of CH4 in the adsorbed phase (xCH4) and more CH4 is driven out. In the second stage,the injected CO2 competes with CH4 for adsorption. The cumulative RCH4 of this stage is much larger than that of the initial stage. However, yCH4 decrease sharply. pCH4 in the whole CO2 injection is always larger than that before CO2 injection, suggesting CH4 desorption results from the displacement by CO2 rather than from pressure depletion. more...
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- 2021
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6. The Poisoning of V2O5-WO3/TiO2 and V2O5-Ce(SO4)(2)/TiO2 SCR Catalysts by KCl and The Partial Regeneration by SO2
- Author
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Hua Nie, Xuesen Du, Vesna Rakić, Wei Li, Vladislav Rac, and Qirong Wu
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inorganic chemicals ,Vanadium ,chemistry.chemical_element ,SO2 regeneration ,02 engineering and technology ,010402 general chemistry ,lcsh:Chemical technology ,01 natural sciences ,Catalysis ,kcl ,KCl ,lcsh:Chemistry ,lcsh:TP1-1185 ,Physical and Theoretical Chemistry ,Chemistry ,nh3-scr ,021001 nanoscience & nanotechnology ,Alkali metal ,0104 chemical sciences ,alkali-poisoning ,lcsh:QD1-999 ,so2 regeneration ,0210 nano-technology ,NH3-SCR ,Deposition (chemistry) ,Nuclear chemistry - Abstract
Poisoning effects by alkali metal chlorides is one of the major reasons for the deactivation of SCR catalyst in biomass-fired plants. In this study, the influence of KCl on two vanadium-based catalysts with different promoters, V2O5-WO3/TiO2 and V2O5-Ce(SO4)2/TiO2, was investigated. The catalytic activity of the fresh V2O5-WO3/TiO2 was higher than that of V2O5-Ce(SO4)2/TiO2 at low temperatures. V2O5-Ce(SO4)2/TiO2 performed better than V2O5-WO3/TiO2 when KCl was deposited on the catalyst surface. Both poisoned catalysts were efficiently regenerated by SO2 treatment. The characterization results show that the reducibility and acidity of the catalysts were weakened by KCl deposition but regenerated by SO2. more...
- Published
- 2020
7. Development of lightweight overlaid laminated bamboo lumber for structural uses
- Author
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Meng Gong, Qirong Wu, Xin Guan, Xueshen Liu, and Haining Yin
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0106 biological sciences ,Bamboo ,Materials science ,Significant difference ,0211 other engineering and technologies ,High density ,Young's modulus ,02 engineering and technology ,Building and Construction ,01 natural sciences ,Hot press ,symbols.namesake ,Flexural strength ,010608 biotechnology ,021105 building & construction ,symbols ,General Materials Science ,Adhesive ,Composite material ,Civil and Structural Engineering - Abstract
The overlaid laminated bamboo lumber (OLBL) was developed for structural applications with an aim to substitute commonly-used building materials such as steel and concrete. The OLBL was, via a hot press, fabricated by cross-laminating bamboo layers, bamboo mats and phenolic impregnated adhesive papers. Since the weight of OLBL was governed by the high density bamboo layer, the panels made of OLBL had a relatively high density value of about 850 kg/m3. In this study, a lightweight panel was developed by a proper arrangement of radial bamboo curtain. The major and minor directions of a panel were the parallel- and perpendicular-to-its length direction, respectively. It was found that 1) the density of an OLBL panel could be reduced by about 20%; 2) the failure occurred in the bamboo node(s); 3) there was a significant difference in effective modulus of elasticity and effective modulus of rupture between two panel directions; and 4) there was a good relationship between the density and strength in the minor direction. more...
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- 2018
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8. Development of laminated bamboo lumber with high bond strength for structural uses by O2 plasma
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Jiqing Li, Jinguo Lin, Wei Wang, Xin Guan, Jianfei Wu, QiRong Wu, and Hong-mei Yuan
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Bamboo ,Materials science ,Bond strength ,0211 other engineering and technologies ,020101 civil engineering ,02 engineering and technology ,Building and Construction ,0201 civil engineering ,O2 plasma ,Wet bonding ,Flexural strength ,021105 building & construction ,Structure design ,Perpendicular ,General Materials Science ,Wetting ,Composite material ,Civil and Structural Engineering - Abstract
To improve the reuse rate of bamboo materials, laminated bamboo lumber (LBL) with high bond strength has been developed for structural use using bamboo residues (BRs). The laminated structure design is an important factor affecting LBL performance, and thus, it is essential to study various LBL blank structures. The major direction is parallel to the panel length, and the minor direction is perpendicular to the panel length. In this study, BRs were cut into A and B units along the major and minor directions, respectively. The LBL with good performance was selected by different forming methods and modified by O2 plasma. It was found that 1) the volume utilization rate of BRs in LBL is above 85%; 2) the wet bonding strength of LBL products is increased by 58.58% compared to ordinary plywood, when the O2 plasma modification time is 6 min and 12 min respectively, the wet bonding strength is increased by 75.69% and 76.27% compared to ordinary plywood; 3) when bamboo pieces are arranged in parallel, the modulus of rupture in the major direction is ~ 2 times greater than in the minor direction, while a staggered arrangement can effectively reduce the bamboo anisotropic effect; 4) the destruction of LBL mainly occurs at the joints; 5) after O2 plasma modification, the wettability of green bamboo and yellow bamboo was significantly improved, followed by bamboo flesh. more...
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- 2021
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9. Design and Implementation of Matrix Converter with Unipolar IGBT
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Qirong Wu, Jiajia Jing, Yanzhe Li, and Wenxia Zhang
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Computer science ,business.industry ,Electrical engineering ,Matrix converters ,Insulated-gate bipolar transistor ,business - Published
- 2018
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10. Effect of A2A receptor antagonist (SCH 442416) on the mRNA expression of glutamate aspartate transporter and glutamine synthetase in rat retinal Müller cells under hypoxic conditions in vitro
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Xin Huang, Peiquan Zhao, Jun Wang, Qirong Wu, Jun Yu, and Xiaoyan Yu
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Cancer Research ,Oncogene ,biology ,medicine.drug_class ,Cell ,Articles ,General Medicine ,Cell cycle ,Receptor antagonist ,Molecular biology ,In vitro ,medicine.anatomical_structure ,Immunology and Microbiology (miscellaneous) ,Biochemistry ,Apoptosis ,Glutamine synthetase ,medicine ,Glutamate aspartate transporter ,biology.protein ,sense organs - Abstract
The purpose of the present study was to investigate the effect of the A(2A) receptor antagonist (SCH 442416) on the mRNA expression of glutamate aspartate transporter (GLAST) and glutamine synthetase (GS) in rat retinal Müller cells under hypoxic conditions in vitro. Immunofluorescent staining of GS and GFAP was used for the identification of Müller cells. The GLAST and GS mRNA expression of Müller cells treated with 0.1, 1 and 10 μM SCH 442416 under hypoxic conditions was examined by real-time PCR. Müller cells increased the mRNA expression of GLAST under hypoxic conditions; those treated with 0.1 μM SCH 442416 showed a further significant increase in the mRNA expression of GLAST in vitro. Although the mRNA expression of GS was decreased under hypoxic conditions, the mRNA expression was increased when Müller cells were treated with 0.1 μM SCH 442416. A(2A) receptor antagonist increased the GLAST and GS expression of Müller cells and accelerated the clearance of extracellular glutamate under hypoxic conditions in vitro. more...
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- 2012
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11. In vitro effect of adenosine on the mRNA expression of Kir 2.1 and Kir 4.1 channels in rat retinal Müller cells at elevated hydrostatic pressure
- Author
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Yu Cheng, Qirong Wu, Chongda Chen, Jun Yu, Yisheng Zhong, Jun Wang, and Xi Shen
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Cancer Research ,Retina ,Oncogene ,Hydrostatic pressure ,Cell ,chemical and pharmacologic phenomena ,hemic and immune systems ,Articles ,General Medicine ,Biology ,Adenosine ,Molecular biology ,In vitro ,medicine.anatomical_structure ,Immunology and Microbiology (miscellaneous) ,Downregulation and upregulation ,immune system diseases ,Apoptosis ,embryonic structures ,Immunology ,otorhinolaryngologic diseases ,medicine ,medicine.drug - Abstract
The aim of this study was to investigate the expression of Kir 2.1 and Kir 4.1 channels at an elevated hydrostatic pressure in vitro, and to determine whether adenosine may modulate the mRNA expression of Kir 2.1 and Kir 4.1 channels in retinal Müller cells at an elevated hydrostatic pressure in vitro. Müller cells treated with 1 μM adenosine at 40 mmHg/24 h, and mRNA expression of Kir 2.1 and Kir 4.1 channels were examined using real-time PCR. Müller cells significantly increased the mRNA expression of Kir 2.1 and Kir 4.1 channels at 40 mmHg/24 h. When further treated with 1 μM adenosine at 40 mmHg/24 h, the mRNA expression of the Kir 2.1 channels decreased, while the mRNA expression of the Kir 4.1 channels continued to increase. When the pressure was elevated, Müller cells were still able to take up K(+) and mediate the potassium concentration of the retina. Adenosine upregulated the expression of the Kir 4.1 channels, but weakly affected the expression of the Kir 2.1 channels. more...
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- 2012
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12. Developments toward a complete micro-total analysis system for Duchenne muscular dystrophy diagnosis
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Casandra Hernandez, Qirong Wu, Steve Thibodeau, Karen Snow, Jerome P. Ferrance, James P. Landers, Yien Kwok, and Braden C. Giordano
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Chemistry ,Duchenne muscular dystrophy ,medicine.disease ,Biochemistry ,DNA extraction ,Molecular biology ,Analytical Chemistry ,law.invention ,Matrix (chemical analysis) ,genomic DNA ,Exon ,law ,medicine ,Environmental Chemistry ,Total analysis system ,Spectroscopy ,Polymerase chain reaction ,Southern blot - Abstract
The diagnosis of Duchenne muscular dystrophy (DMD) has historically utilized either PCR or requires Southern blot analysis, a southern blot analysis, however, is not amenable to incorporation in a microdevice format. A PCR amplification-based method has been developed, and we have previously coupled this amplification with microchip separation of the PCR fragments for DMD diagnosis. Diagnoses of affected patients were performed by comparing exon concentrations to those of control samples amplified at the same time. To accurately identify mutations in patient samples, this work established normal ranges for the concentration of each amplified exon fragment using control samples amplified over successive days. Our studies show that the number of cycles used in the amplification process affects this range. Affected patient samples were analyzed using these normal ranges and the mutations detected by Southern blot analysis were also diagnosed using the microchip separation method. Employing the microchip separation method decreases the time required for the analysis, but the time required for DNA purification and PCR amplification must also be decreased for faster total analysis of patient samples. Development of microchip methods for these processing steps is one approach for reducing the individual times, while also providing the possibility of integrating these steps in a single device. Here we report on the microchip extraction of genomic DNA from whole blood using a novel sol–gel matrix that is easily formed in microdevices. IR-mediated PCR amplification of a β-globin fragment from genomic DNA followed by electrophoretic analysis on a single integrated microdevice is presented for the first time. Work towards the development of a micro-total analysis device for DMD diagnosis, through integration of all processing steps on a single device, is also discussed. more...
- Published
- 2003
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13. Performance of metal complex substituted polysiloxanes in capillary electrophoresis and capillary electrochromatography
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Roger G. Harrison, Milton L. Lee, and Qirong Wu
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chemistry.chemical_classification ,Capillary electrochromatography ,Chromatography ,Siloxanes ,Organic Chemistry ,Electrophoresis, Capillary ,Reproducibility of Results ,General Medicine ,Polymer ,Biochemistry ,Analytical Chemistry ,Electrophoresis ,chemistry.chemical_compound ,Sulfonate ,Capillary electrophoresis ,chemistry ,Electrochromatography ,Metals ,Covalent bond ,Alkylbenzenes ,Chromatography, Micellar Electrokinetic Capillary - Abstract
Two novel polysiloxanes containing the metal complex, Co(TACN)(3+)2 (TACN= 1,4,7-triazacyclononane) were used as coatings for capillary electrophoresis (CE) and capillary electrochromatography (CEC). Through crosslinking and covalent bonding, the positively charged polymers were bonded to silica supports. In both CE and CEC, these coatings exhibited strong, pH-independent, and anodic electroosmotic flow (EOF), and had excellent long-term stability. Successful separations of aromatic acids were achieved in CE. In CEC, separation of alkylbenzenes (7 min) and basic compounds (20 min) was achieved with higher resolving power than conventional octadecyl silica packings. These polymers represent a new class of coatings for CE and CEC that generate pH-independent EOF. more...
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- 2002
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14. Metal complex-substituted polysiloxanes as novel coatings for capillary electrophoresis and capillary electrochromatography
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Qirong Wu, Milton L. Lee, and Roger G. Harrison
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Magnetic Resonance Spectroscopy ,Siloxanes ,Inorganic chemistry ,chemistry.chemical_element ,Ligands ,Biochemistry ,Analytical Chemistry ,Metal ,Capillary electrophoresis ,Electrochromatography ,Chromatography, Micellar Electrokinetic Capillary ,chemistry.chemical_classification ,Capillary electrochromatography ,Chromatography ,Organic Chemistry ,Electrophoresis, Capillary ,General Medicine ,Polymer ,Kinetics ,Electrophoresis ,Hydrocarbon ,chemistry ,visual_art ,visual_art.visual_art_medium ,Thermodynamics ,Cobalt - Abstract
Two novel polysiloxane-based polymers, which contain metal complexes, have been prepared. To prepare the Co(TACN)3+(2) (TACN= 1,4,7-triazacyclononane) based polymers, an orthoamide derivative of TACN was added to bromobutane-substituted methylpolysiloxane and hydrolyzed with base. Co(II) was then coordinated to the TACN, followed by cobalt oxidation to make polymer A or followed by N-octyl TACN coordination and cobalt oxidation to make polymer B. In both materials, TACN forms thermodynamically and kinetically stable Co(TACN)3+(2) complexes in which the six coordination sites of the Co(III) are occupied by nitrogens from the TACN. The polymers were coated on fused-silica capillary columns and spherical silica particles, which were used for capillary electrophoresis and capillary electrochromatography, respectively. The open and packed columns showed strong and pH-independent reversed electroosmotic flow. more...
- Published
- 2002
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15. Microchip-based macroporous silica sol-gel monolith for efficient isolation of DNA from clinical samples
- Author
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Pamela M. Norris, Benjamin J. Hassan, Braden C. Giordano, Qirong Wu, Jerome P. Ferrance, James P. Landers, Joan M. Bienvenue, and Yien C. Kwok
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DNA, Bacterial ,geography ,geography.geographical_feature_category ,Chromatography ,Chemistry ,Silica gel ,Extraction (chemistry) ,DNA ,DNA separation by silica adsorption ,DNA extraction ,Polymerase Chain Reaction ,Phase Transition ,Analytical Chemistry ,chemistry.chemical_compound ,Tetramethyl orthosilicate ,DNA, Viral ,Microchip Analytical Procedures ,Humans ,Organosilicon Compounds ,Solid phase extraction ,Monolith ,Ethylene glycol ,Porosity - Abstract
Effective microchip extraction of deoxyribonucleic acid (DNA) from crude biological matrixes has been demonstrated using silica beads or hybrid phases composed of beads and sol-gel. However, the use of monolithic sol-gels alone for extraction of human genomic DNA has been more difficult to define. Here we describe, for the first time, the successful use of monolithic tetramethyl orthosilicate-based sol-gels for effective micro-solid-phase extraction (muSPE) of DNA in a glass microchip format. A functional monolithic silica phase with micrometer-scale pores in the silica matrix resulted from addition of poly(ethylene glycol), a poragen, to the precursor mixture. This allowed a monolithic sol-gel bed to be established in a microchip channel that provided large surface area for DNA extraction with little flow-induced back pressure. DNA extraction efficiencies for simple systems (lambda-phage DNA) were approximately 85%, while efficiencies for the reproducible extraction of human genomic DNA from complex biological matrixes (human blood) were approximately 70%. Blockage of the sol-gel pores by components in the lysed blood was observed in repeat extraction on a single device as a decrease in the extraction efficiency. The developed muSPE protocol was further evaluated to show applicability to clinical samples and bacterial cultures, through extraction of PCR-amplifiable DNA. more...
- Published
- 2006
16. Monolithic Sol-gel Microchip Device for Efficient Isolation of Nucleic Acid From Clinical Samples
- Author
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Braden C. Giordano, Michael C. Breadmore, Yien C. Kwok, James P. Landers, Jerome P. Ferrance, Pamela A. Norris, James M. Karlinsey, Benjamin J. Hassan, Sushil Shrinivasan, and Qirong Wu
- Subjects
endocrine system ,Materials science ,Chromatography ,Extraction (chemistry) ,Nucleic acid ,DNA extraction ,Sol-gel - Abstract
The feasibility of using monolithic sol-gels for micro-solid phase extraction (μSPE) of deoxyribonucleic acid (DNA) in a microchip format is explored in this work. The monolithic sol-gel bed in a microchip allows efficient DNA purification and extraction with back pressures that are significantly lower than a particle-packed extraction bed. The applicability of the developed μSPE DNA extraction protocol to clinical samples, for example blood and serum, is successfully demonstrated. more...
- Published
- 2002
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17. Committee on Pesticide and Disinfectant Formulations
- Author
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Adrian W Burns, Diane M Rains, Warren Robert Bontoyan, Doug Marsh, Christopher L Ritland, Earlene Erbe, Rose Nelson, Qirong Wu, Rodney Noel, and Jung K Lee
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Pharmacology ,Environmental Chemistry ,Agronomy and Crop Science ,Food Science ,Analytical Chemistry - Published
- 2008
- Full Text
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18. Simulation of DeNOx mass balance based on visual component library (VCL)
- Author
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Xiu Yang, Qirong Wu, Yu Yu, and Yungui Du
- Subjects
Environmental Engineering ,Balance (accounting) ,Control theory ,Component (UML) ,Environmental science ,Management, Monitoring, Policy and Law ,Pollution
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