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A reverse particle grading strategy for design and fabrication of porous SiC ceramic supports with improved strength

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Journal of Advanced Ceramics 2024年第7期13卷 1011-1022页

作者： Zheng Liang Han Zhang Yichuan Li Wenkang Zhang Jian Zhou Qilin Gu Zhaoxiang Zhong weihong xing State Key Laboratory of Materials-Oriented Chemical Engineering National Engineering Research Center for Special Separation MembraneNanjing Tech UniversityNanjing 211816China Nanjing Membrane Application Institute Co. Ltd.Nanjing 210009China

Porous ceramics usually require high mechanical strength and maximized porosity simultaneously,while for conventional particle grading strategies,it is highly challenging to meet both *** this end,a reverse particle grading strategy was developed based on the linear packing model by unusually introducing coarse particles(d50=16μm)into a fine particle(d50=5μm)*** the extrusion and sintering process,tubular porous SiC ceramic supports with improved mechanical strength were successfully *** effects of coarse particles on the rheological properties of the ceramic paste and the macroscopic properties and microstructure of the SiC supports were systematically *** an increase in the content of coarse SiC particles to 30 wt%,the pressure generated during extrusion decreased from 5.5±0.2 to 1.3±0.1 ***,the bending strength of the tubular supports increased from 36.6±5.6 to 49.1±4.5 MPa when 20 wt%coarse powder was *** notably improved mechanical strength was attributed to the distribution of coarse particles that prolonged the route of crack ***,the optimized tubular supports had an average pore size of 1.2±0.1μm,an open porosity of 45.1%±1.6%,and a water permeability of 7163±150 L/(m2·h·bar)as well as good alkali and acid corrosion ***,the strategy was proven to be feasible for the scale-up fabrication of 19-channel SiC tubular porous ceramic supports.

关键词： porous SiC ceramic tubular ceramic support reverse particle grading reaction bonding chemical stability

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The effect of cation–π interactions in electrolyte/organic nanofiltration systems

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Chinese Journal of Chemical Engineering 2016年第3期24卷 345-352页

作者： Gang Yang Yu Ma weihong xing Nanjing Tech University Nanjing 210009China

The rejection properties of a nanofiltration organic membrane were investigated using KCI solutions, NaC1 solutions, NaC1/benzyl alcohol hybrid solutions and KCl/benzyl alcohol hybrid solutions. The presence of benzyl alcohol （3.7 mol · m-3） caused a decrease in electrolyte rejection within the range of 0 to 6%. The mechanism of the decrease was discussed. The cation-n bond was assumed to form in the hybrid solution and to further induce the partial dehydration of the cation. The steric and charge density inhibition of the salt activity was strengthened, and the salt rejection was thus decreased. A simulation was performed to evaluate the radius of the cation. 2015 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved.

关键词： Nanofiltration Cation-n interaction Dehydration Steric effect

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Special issue on “Membranes and Water Treatment”

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Frontiers of Chemical Science and Engineering 2022年第5期16卷 561-563页

作者： Congjie Gao Nanping Xu weihong xing Center for Membrane and Water Science&Technology Zhejiang University of TechnologyHangzhou 310014China State Key Laboratory of Materials-Oriented Chemical Engineering Nanjing Tech UniversityNanjing 211816China National Engineering Research Center for Special Separation Membranes Nanjing Tech UniversityNanjing 211816China

Water scarcity is becoming the greatest global crisis of our *** increasing demand for clean and safe water calls for intensive research on advanced water treatment *** decades have witnessed the rapid development of membrane technology,which are competitive for water and wastewater treatment,and encouragingly,some of them have been commercialized *** advances in material science have substantially promoted the further development of membranes technology in the aspects of membrane materials,membrane microstructure and fabrication process.

关键词： wastewater treatment becoming

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A bifunctional MnO_x@PTFE catalytic membrane for efficient low temperature NO_x-SCR and dust removal

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Chinese Journal of Chemical Engineering 2020年第5期28卷 1260-1267页

作者： Shasha Feng Mengdi Zhou Feng Han Zhaoxiang Zhong weihong xing State Key Laboratory of Materials-Oriented Chemical Engineering National Engineering Research Center for Special Separation MembraneNanjing Tech UniversityNanjing 210009China Nanjing Industrial Technology Research Institute of Membrane Material Co.Ltd. Nanjing 211100China

Low-temperature selective catalytic reduction of NOx combined with dust removal technique due to its energy conservation characteristic has been attracted much attention for fume *** this work,the MnOx wrapped PTFE membrane with efficient dust removal and low-temperature NH3-SCR has been prepared with a facile *** different crystal structures was uniformly grown around the PTFE fibrils through water *** flower-sphere-like MnOx@PTFE(O-MnOx@PTFE)and lamellar-interlaced ripple-like MnOx@PTFE(W-MnOx@PTFE)have large specific surface area which is favorable for enhancing catalytic ***,the uniformly wrapped W-MnOxaround the PTFE fibrils optimized the pore structure for ultrafine dust *** membrane can almost 100%reject particles that are smaller than 1.0μm with a low filtration ***,W-MnOx@PTFE with more surface chemisorbed oxygen has the best NO conversion efficiency of 100%at a comparatively low and wide activity temperature window of 160–210°C,which is far to the thermal limitation of the ***,this efficient and energy conserving membrane has a bright application prospects for tail gas treatment compared to the original treatment process.

关键词： MnO_x PTFE Catalytic membrane Low-temperature SCR

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Effects of the original state of sodium-based additives on microstructure,surface characteristics and filtration performance of SiC membranes

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Chinese Journal of Chemical Engineering 2023年第11期63卷 1-11页

作者： Yuling Xie Qilin Gu Qian Jiang Zhaoxiang Zhong weihong xing National Engineering Research Center for Special Separation Membrane State Key Laboratory of Materials-Oriented Chemical EngineeringCollege of Chemical EngineeringNanjing Tech UniversityNanjing 210009China School of Environmental Science and Engineering Nanjing Tech UniversityNanjing 211816China

Sodium-contained compounds are promising sintering additives for the low-temperature preparation of reaction bonded SiC *** sodium-based sintering additives in various original states were attempted,their effects on microstructure and surface properties have rarely been *** this work,three types of sodium-based additives,including solid-state NaA zeolite residue(NaA)and liquidstate dodecylbenzene sulfonate(SDBS)and water glass(WG),were separately adopted to prepare SiC membranes,and the microstructure,surface characteristics and filtration performance of these SiC membranes were comparatively *** showed that the SiC membranes prepared with liquid-state SDBS and WG(S-SDBS and S-WG)showed lower open porosity yet higher bending strength compared to those prepared with solid-state NaA(S-NaA).The observed differences in bending strength were further interpreted by analyzing the reaction process of each sintering additive and the composition of the bonding phase in the reaction bonded SiC ***,the microstructural differentiation was correlated to the original state of the *** addition,their surface characteristics and filtration performance for oil-in-water emulsion were examined and correlated to the membrane *** S-NaA samples showed higher hydrophilicity,lower surface roughness(1.80μm)and higher rejection ratio(99.99%)in O/W emulsion separation than those of S-WG and *** can be attributed to the smaller mean pore size and higher open porosity,resulting from the originally solid-state NaA ***,this work revealed the comprehensive effects of original state of sintering additives on the prepared SiC membranes,which could be helpful for the application-oriented fabrication by choosing additives in suitable state.

关键词： SiC membrane Sintering additive Reaction sintering Microstructure Oil-in-water emulsions

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Hydroxyl radical intensified Cu2O NPs/H2O2 process in ceramic membrane reactor for degradation on DMAc wastewater from polymeric membrane manufacturer

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Frontiers of Environmental Science & Engineering 2020年第6期14卷 123-134页

作者： Wenyue Li Min Chen Zhaoxiang Zhong Ming Zhou weihong xing State Key Laboratory of Materials Orented Chemical Engineein National Engineering Research Center for Specilized Separation MembranesNanjing Tech UniversityNanjing 21000China

High-concentration industrial wastewater containing N,N-dimethylacetamide(DMAc)from polymeric membrane manufacturer was degraded in Cu2O NPs/H2O2 *** the membrane assisted Fenton process DMAc removal rate was up to 98%with 120 min which was increased by 23%over the batch *** was found that:OH quench time was extended by 20 min and the maximum:0H productivity was notably 88.7%higher at 40 *** degradation reaction rate constant was enhanced by 2.2 times with membrane dispersion(k=0.0349 min^-1).DMAc initial concentration(C0)and H202 flux (Jp)had major influence on mass transfer and kinetics,meanwhile,membrane pore size(rp)and length(L)also affected the Treaction *** intensifed radical yield,fast mass transfer and nanoparticles high activity all contributed to improve pollutant degradation ***-resolved DMAC degradation pathway was analyzed as hydroxylation,demethylation and oxidation leading to the finai products of CO2;H20 and NO3^-(*** NH,from biodegradation).Continuous process was operated in the dual-membrane configuration with in situ reaction and *** five cycling,tests,DMAc removal was all above 95%for the initial[DMAc]0=14,000 mg/L in wastewater and stability of the catalyst and the membrane maintained weil.

关键词： Ceramic membrane reactor AyV-dimethylacetamide Fenton process Cu20 Wastewater treatment

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Nb_(2)O_(5)promoted Pd/AC catalyst for selective phenol hydrogenation to cyclohexanone

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Chinese Journal of Chemical Engineering 2022年第4期35卷 87-93页

作者： Chunhua Zhang Zhengyan Qu Hong Jiang Rizhi Chen weihong xing State Key Laboratory of Materials-Oriented Chemical Engineering Nanjing Tech UniversityNanjing 210009China Changzhou Key Laboratory of Eco-Textile Technology Changzhou Vocational Institute of Textile and GarmentChangzhou 213164China

Phenol hydrogenation is a green route to prepare cyclohexanone,an intermediate for the production of nylon 66 and nylon *** development of high-performance catalysts still keeps a great ***,the activated carbon(AC)was modified with an acidic material Nb_(2)O_(5)to adjust the microstructure and surface properties of AC,and the influences of the calcination temperature and Nb_(2)O_(5)content on the catalytic performance of the Pd/AC-Nb_(2)O_(5)catalysts for the phenol hydrogenation to cyclohexanone were *** Nb_(2)O_(5)with proper content can be highly uniformly distributed on the AC surface,enhancing the acidity of the Pd/AC-Nb_(2)O_(5)catalysts with comparable specific surface area and Pd dispersion,thereby improving the catalytic *** hybrid Pd/AC-10 Nb_(2)O_(5)-500 catalyst exhibits the synergistic effect between the Pd nanoparticles and AC-10 Nb_(2)O_(5),which enhances the catalytic activity for the hydrogenation of ***,the as-prepared Pd/AC-10 Nb_(2)O_(5)-500 catalyst shows good reusability during 7 reaction cycles.

关键词： Phenol hydrogenation Cyclohexanone Nb_(2)O_(5) Pd/AC Acidity

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Membrane enhanced COD degradation of pulp wastewater using Cu_2O/H_2O_2 heterogeneous Fenton process

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Chinese Journal of Chemical Engineering 2018年第9期26卷 1896-1903页

作者： Hongjia Zhou Lin Kang Ming Zhou Zhaoxiang Zhong weihong xing State Key Laboratory of Materials-Oriented Chemical Engineering National Engineering Research Center for Special Separation Membrane Nanjing Tech University

Both activity and stability of the catalyst can be improved in heterogeneous Fenton reaction,in particular,with no limitation for the working p H and no production of the *** this work,a combination of catalyst Cu_2O and pore-channel-dispersed H_2O_2is proposed to treat the pulp *** degree of CODs in the wastewater was up to 77%in the ceramic membrane reactor using Cu_2O powder(2.0 g·L^(-1))and membranefeeding H_2O_2(0.8 ml·L^(-1))within 60 *** of·OH radical formation in the advanced oxidation process was analyzed with a fluorescent *** efficiency of H_2O_2was successfully enhanced by 10%with the membrane *** on,the catalyst recyclability was evaluated in a five-cycle *** concentration of copper ions being dissolved in the treated water was monitored with *** Cu_2O/H_2O_2(membrane)treatment the effluent is qualified to discharge with COD concentration lower than 15 mg·L^(-1)with regard to the national standard GB25467-2010.

关键词： Pulp wastewater Heterogeneous Fenton Membrane Cu2O Advanced oxidation

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Catalytic performance of hybrid Pt@ZnO NRs on carbon fibers for methanol electro-oxidation

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Chinese Journal of Chemical Engineering 2017年第12期25卷 1871-1876页

作者： Dongyan Li Chen Gu Feng Han Zhaoxiang Zhong weihong xing Department of Chemical Engineering and Materials Nanjing Polytechnic Institute State Key Laboratory of Materials-Oriented Chemical Engineering National Engineering Research Center for Special Separation Membrane Nanjing Tech University

A novel Pt@ZnO nanorod/carbon fiber （NR/CF） with hierarchical structure was prepared by atomic layer deposition combined with hydrothermal synthesis and magnetron sputtering （MS）. The morphology of Pt changes from nanoparticle to nanorod bundle with controlled thickness of Pt between 10 and 50 nm. Significantly, with the increase of voltage from 0 to 0.6 V （vs. standard calomel electrode）, the prompt photocurrent generated on ZnO NR/CF increases from 0235 to 0.725 mA. Besides, the Pt@ZnO NR/CF exhibited higher electrochemical active surface area （ECSA） value, better methanol oxidation ability and CO tolerance than Pt@CF, which demonstrated the importance of the multifunctional ZnO support. As the thickness of Pt increasing from 10 to 50 rim, the ECSA values were improved proportionally, leading to the improvement of methanol oxidation ability. More importantly, UV radiation increased the density of peak current of Pt@ZnO NR/CF towards methanol oxidation by additional 42.4%, which may be due to the synergy catalysis of UV light and electricity.

关键词： Carbon fibers ZnO nanorods Pt Magnetron sputtering Methanol electro-oxidation

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Investigation of Mg^2＋/Li^＋ Separation by Nanofiltration

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Chinese Journal of Chemical Engineering 2011年第4期19卷 586-591页

作者： YANG Gang SHI Hong LIU Wenqiang xing weihong XU Nanping State Key Laboratory of Materials-Oriented Chemical Engineering Nanjing University of Technology Nanjing 210009 China

The Mg2+/Li+/Cl solutions were filtrated with a commercially available DK nanofiltration membrane to investigate the possibility to enrich the lithium *** investigation was significant as such an approach might be a competing substitute for the present lithium purification industry and the environmental protection *** Donnan steric pore model(DSPM) was implemented for the *** separation of Mg2+/Li+was mainly affected by the working pressure(or the permeation flux) and a limiting separation factor was found around *** effective membrane charge density was evaluated and its dependence on the permeation flux as well as the ion pattern was *** predicting an actual separation of electrolytes,the experimental investigation seems necessary for the reliability and efficiency.

关键词： nanofiltration lithium recovery DSPM model separation factor

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