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Electrocatalytic reduction of nitrate using Pd-Cu modified carbon nanotube membranes
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作者 Zhijun Liu Xi Luo +1 位作者 Senlin Shao Xue Xia 《Frontiers of Environmental Science & Engineering》 SCIE EI CSCD 2023年第4期1-11,共11页
Excessive nitrate in water is harmful to the ecological environment and human health.Electrocatalytic reduction is a promising technology for nitrate removal.Herein,a Pd-Cu modified carbon nanotube membrane was fabric... Excessive nitrate in water is harmful to the ecological environment and human health.Electrocatalytic reduction is a promising technology for nitrate removal.Herein,a Pd-Cu modified carbon nanotube membrane was fabricated with an electrodeposition method and used to reduce nitrate in a flowthrough electrochemical reactor.The optimal potential and duration for codeposition of Pd and Cu were-0.7 V and 5 min,respectively,according to linear scan voltammetry results.The membrane obtained with a Pd:Cu ratio of 1:1 exhibited a relatively high nitrate removal efficiency and N_(2)selectivity.Nitrate was almost completely reduced(~99%)by the membrane at potentials lower than-1.2 V.However,-0.8 V was the optimal potential for nitrate reduction in terms of both nitrate removal efficiency and product selectivity.The nitrate removal efficiency was 56.2%,and the N_(2)selectivity was 23.8%for the Pd:Cu=1:1 membrane operated at-0.8 V.Nitrate removal was enhanced under acidic conditions,while N_(2)selectivity was decreased.The concentrations of Cl-ions and dissolved oxygen showed little effect on nitrate reduction.The mass transfer rate constant was greatly improved by 6.6 times from 1.14×10^(-3)m/h at a membrane flux of 1 L/(m^(2)·h)to 8.71×10^(-3)m/h at a membrane flux of 15 L/(m^(2)·h),which resulted in a significant increase in the nitrate removal rate from 13.6 to 133.5 mg/(m^(2)·h).These findings show that the Pd-Cu modified CNT membrane is an efficient material for nitrate reduction. 展开更多
关键词 Pd-Cu modified CNT membrane Nitrate reduction FLOW-THROUGH ELECTRODEPOSITION Electrocatalytic reduction
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Preparation and Blood Compatibility of Oxidized-chitosan Films 被引量:2
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作者 YueDongYANG JiuGaoYU +1 位作者 YongGuoZHOU PeiGuoLI 《Chinese Chemical Letters》 SCIE CAS CSCD 2005年第7期991-994,共4页
Chitosan membrane was modified by the selective oxidization of chitosan molecules on its surface with NO2 gas. FTIR spectra indicated there were plenty of –COOH and –COO- groups on the modified membrane surface. The... Chitosan membrane was modified by the selective oxidization of chitosan molecules on its surface with NO2 gas. FTIR spectra indicated there were plenty of –COOH and –COO- groups on the modified membrane surface. The SEM study showed the modified membrane surface was rough rather than smooth as chitosan membrane. All antithrombosis test, hemolysis test and blood cell morphology observation with SEM revealed that modified chitosan membranes have superior blood compatibility to chitosan. 展开更多
关键词 CHITOSAN blood compatibility modified chitosan membrane nitrogen dioxide.
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Low-cost method of fabricating large-aperture,high efficiency,Fresnel diffractive membrane optic using a modified moir technique 被引量:4
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作者 张健 栗孟娟 +4 位作者 阴刚华 焦建超 刘正坤 徐向东 付绍军 《Chinese Optics Letters》 SCIE EI CAS CSCD 2016年第10期10-14,共5页
To reduce the cost and achieve high diffraction efficiency, a modified moir@ technique for fabricating a large- aperture multi-level Fresnel membrane optic by a novel design of alignment marks is proposed. The modifie... To reduce the cost and achieve high diffraction efficiency, a modified moir@ technique for fabricating a large- aperture multi-level Fresnel membrane optic by a novel design of alignment marks is proposed. The modified moire fringes vary more sensitively with the actual misalignment. Hence, the alignment accuracy is significantly improved. Using the proposed method, a 20 μm thick, four-level Fresnel diffractive polyimide membrane optic with a 200 mm diameter is made, which exhibits over 62% diffraction efficiency into the +1 order, and an efficiency root mean square of 0.051. 展开更多
关键词 technique Low-cost method of fabricating large-aperture high efficiency Fresnel diffractive membrane optic using a modified moir high
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Mixed Matrix Membranes of Polysulfone/Polyimide Reinforced with Modified Zeolite Based Filler: Preparation, Properties and Application 被引量:1
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作者 Sedra Tul Muntha Muhammad Siddiq +1 位作者 Ayesha Kausar Anum Khan 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2018年第1期65-77,共13页
In this work, polysulfone/polyimide(PSf/PI) mixed matrix membranes were fabricated by reinforcement of modified zeolite(MZ) particles through solution casting method for investigation of antibacterial activity aga... In this work, polysulfone/polyimide(PSf/PI) mixed matrix membranes were fabricated by reinforcement of modified zeolite(MZ) particles through solution casting method for investigation of antibacterial activity against two gram negative bacteria(Salmonella typhi, Klebsella pneumonia) and two gram positive bacteria(Staphylococcus aureus, Bacillus subtilis). The modified zeolite particles were incorporated to PSf and PI matrix and the influence of these particles on thermal, mechanical and structural properties was evaluated. The morphological evolution was investigated through scanning electron microscopy(SEM) and transmission electron microscopy(TEM) analysis, which revealed good compatibility between organic polymer matrix and inorganic filler. Mechanical stability was investigated by tensile testing while thermal analysis was evaluated by thermogravimetric analysis(TGA) and differential scanning calorimetry(DSC). This revealed improvement in thermal properties with increasing filler concentration from 1 wt% to 10 wt%. Structural analysis was successfully done using X-ray diffraction analysis(XRD) and Fourier transform infrared(FTIR) spectroscopy. Solvent content of fabricated mixed matrix membranes was observed to decrease while moving from more hydrophilic to less hydrophilic solvent. However, addition of filler content enhanced the porosity of fabricated membranes. The synthesized mixed matrix membranes exhibited good antibacterial activity and the highest activity was shown by PSf/PI/MZ mixed matrix membrane. Therefore, the combination effect of PSf, PI and MZ sufficiently enhanced the antibacterial activity of mixed matrix membranes. 展开更多
关键词 modified zeolite Polysulfone/polyimide blend membrane Mixed matrix membrane Thermal analysis Antibacterial activity
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Preparation,characterization and performance of poly(m-phenylene isophthalamide)/organically modified montmorillonite nanocomposite membranes in removal of perfluorooctane sulfonate
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作者 Qin Luo Yanxia Liu +1 位作者 Guixia Liu Changwei Zhao 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2016年第8期126-133,共8页
Nanocomposite membranes containing poly(m-phenylene isophthalamide)(PMIA) and organically modified montmorillonite(OMMT) were prepared by a combination of solution dispersion and wet-phase inversion methods, and... Nanocomposite membranes containing poly(m-phenylene isophthalamide)(PMIA) and organically modified montmorillonite(OMMT) were prepared by a combination of solution dispersion and wet-phase inversion methods, and the effects of OMMT addition on the properties and performance of fabricated nanofiltration membranes were investigated. The membranes were characterized by contact angle measurements, scanning electron microscopy(SEM), atomic force microscopy(AFM), thermogravimetric analysis, and zeta potential.The performance of the membranes was elucidated by the removal of perfluorooctane sulfonate(PFOS) at neutral p H. Increasing OMMT concentration improved the thermal stability and hydrophilicity of the membranes. The permeation and rejection of PFOS were significantly improved. The performance of fabricated nanofiltration membranes in removal of PFOS varied depending on the solute and membrane properties as well as solution conditions. Finally,a comparison between fabricated membranes and a commercial NF membrane(ESNA1-K1,Hydecanme) proved that the OMMT addition is a convenient procedure for producing nanocomposite membranes with superior properties and performance. 展开更多
关键词 Nanofiltration membrane Organically modified montmorillonite PFOS removal
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