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High permeability poly(vinylidene fluoride)ultrafiltration membrane doped with polydopamine modified TiO_(2) nanoparticles

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Chinese Journal of Chemical Engineering 2020年第12期28卷 3152-3158页

作者： Qi Zhang zhaoliang cui Weixing Li State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 210009China National Engineering Research Center for Special Separation Membrane Nanjing Tech UniversityNanjing 210009China

In order to improve the water permeability of poly(vinylidene fluoride)(PVDF)ultrafiltration(UF)membranes with low molecular weight cut-off(MWCO),polydopamine(PDA)was employed in the membrane preparation *** to itsmerits of material-independent adhesion,PDAwas coated on inorganic particles or added in coagulation bath to tailor the final membrane structure and *** introduction of PDA broke through the permeability/selectivity trade-off of the PVDF *** adding the PDA coated titaniumdioxide(PDA/TiO2)nanoparticles,water flux increased by 287% while MWCO kept similar with the pristine PVDF *** and Kinetics of the PVDF/additives/non-solvent were analyzed and shown that nanoparticles reduced the thermodynamic stability and increased the phase separation speed,and the speed can be adjusted using different ***,X-ray diffraction(XRD)test indicated that PVDF crystalline form changed fromαphase to β phase after adding different ***/selectivity trade-offwas broken through by DA addition in coagulation *** with the original PVDF membrane,when the DA concentration of the coagulation bath was 2.0 g·L^−1,water flux increased by 312%,and MWCO of the PVDF membrane ranged in 10,000 to 20,000 Da as well as contact angle decreased from 81.4°to 45°.

关键词： Poly(vinylidene fluoride)membrane Polydopamine Permeability/selectivity trade-off

Fouling behavior of poly(vinylidene fluoride)(PVDF)ultrafiltration membrane by polyvinyl alcohol(PVA)and chemical cleaning method

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Chinese Journal of Chemical Engineering 2020年第12期28卷 3018-3026页

作者： Weijie Ding Min Chen Ming Zhou Zhaoxiang Zhong zhaoliang cui Weihong Xing State Key Laboratory of Materials-Oriented Chemical Engineering National Engineering Research Center for Special Separation MembraneNanjing Tech UniversityNanjing 211816China

Severe fouling to poly(vinylidene fluoride)(PVDF)membrane is usually caused as filtrating the papermaking wastewater in the ultrafiltration(UF)*** the paper,fouling behavior and mechanism were investigated,and the low-concentration polyvinyl alcohol(PVA)contained in the sedimentation tank wastewater was found as the main ***,the corresponding cleaning approach was *** experiment and modeling results elaborated that the fouling mode developed from pore blockage to cake layer along with filtration *** cleaning conditions including the composition and concentration of reagents,cleaning duration and trans-membrane pressure were investigated for their effect on cleaning *** water flux was recovered by over 95% after cleaning the PVDF membrane using the optimal conditions 0.5 wt% NaClO(as oxidant)and 0.1 wt% sodiumdodecyl benzene sulfonate(SDBS,as surfactant)at 0.04MPa for 100 *** the chemical cleaning method,hypochlorite(ClO−)could first chain-scissor PVA macromolecules to small molecules and SDBS could wrap the fragments in micelles,so that the foulants were removed from the pores and surface of *** eight cycling tests,pure water flux recovery maintained above 95% and the reused membrane was found intact without defects.

关键词： PVDF membrane Fouling PVA Chemical cleaning

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A/O-MBR在冷轧含油废水处理中的应用

南京工业大学学报（自然科学版） 2024年第1期46卷 12-19页

作者：高恒时锦银周玥周杰刘飞汪朝晖崔朝亮南京工业大学化工学院材料化学工程国家重点实验室江苏南京211800 南京工业大学国家特种分离膜工程技术研究中心江苏南京211800 南京久盈膜科技有限公司江苏南京211800

在轧钢生产过程中,会产生大量的废水,这些废水如果直接排放,不仅污染环境,而且造成水资源严重浪费。用厌氧/好氧膜生物反应器(A/O-MBR)中试装置和自制聚偏氟乙烯(PVDF)内衬膜帘式组件,在南京某钢铁股份有限公司进行轧钢废水处理中试试验... 详细信息

在轧钢生产过程中,会产生大量的废水,这些废水如果直接排放,不仅污染环境,而且造成水资源严重浪费。用厌氧/好氧膜生物反应器(A/O-MBR)中试装置和自制聚偏氟乙烯(PVDF)内衬膜帘式组件,在南京某钢铁股份有限公司进行轧钢废水处理中试试验,实现轧钢废水的达标排放。试验结果得到,废水的浊度去除率在99%以上,化学需氧量(COD)去除率在90%以上,矿物油去除率在80%以上,产水的浊度、COD、油含量分别可以达到0.2 NTU、50 mg/L、4.5 mg/L以下。膜组件在亚临界通量下长期稳定运行至250 h左右时,跨膜压差(TMP)快速升高并达到极限30 kPa,膜组件达到极限。膜污染阻力分析试验计算得出膜污染的主要类型为滤饼层污染,这部分污染物通过简单水洗即可去除,另外有较大比例的膜孔堵塞污染,这部分污染物是构成不可逆污染的主要成分,也是试验后期TMP快速升高的主要原因。轧钢废水内含的矿物油加剧了膜污染,用低浓度NaClO周期性反洗后收获了良好的效果。

关键词： PVDF内衬膜膜生物反应器轧钢废水膜污染膜清洗

Poly(vinylidene fluoride-co-hexafluoro propylene) membranes prepared via thermally induced phase separation and application in direct contact membrane distillation

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Frontiers of Chemical Science and Engineering 2022年第5期16卷 720-730页

作者： Jun Pan Lixun Zhang Zhaohui Wang Shi-Peng Sun zhaoliang cui Naser Tavajohi State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 210009China National Engineering Research Center for Special Separation Membrane Nanjing Tech UniversityNanjing 210009China Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM) Nanjing Tech UniversityNanjing 210009China Department of Chemistry UmeåUniversity90187 UmeåSweden

A non-toxic and environmentally safe diluent,acetyl tributyl citrate,was employed to prepare poly(vinylidene fluoride)-co-hexafluoropropylene membranes via thermally induced phase *** of the polymer concentration on the phase diagram,membrane morphology,hydrophobicity,pore size,porosity and mechanical properties(tensile stress and elongation at break)were *** results showed that the pore size and porosity tended to decrease with increasing polymer concentration,whereas the contact angle,liquid entry pressure and mechanical properties showed the opposite *** direct contact membrane distillation operation with 3.5 wt-%sodium chloride solution as the feed solution,the prepared membranes performed high salt rejection(>99.9%).Furthermore,the prepared membranes retained excellent performance in long-term stability tests regarding the permeate flux and salt rejection. ne distillation.

关键词： poly(vinylidene fluoride)-co-hexafluoropropylene thermally induced phase separation non-toxic diluent direct contact membrane distillation

Fabrication of poly(vinylidene fluoride) membrane via thermally induced phase separation using ionic liquid as green diluent

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Chinese Journal of Chemical Engineering 2020年第5期28卷 1415-1423页

作者： Xiaozu Wang Xiaogang Li Juan Yue Yangming Cheng Ke Xu Qian Wang Fan Fan Zhaohui Wang zhaoliang cui State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 210009China Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM) Nanjing Tech UniversityNanjing 210009China National Engineering Research Center for Special Separation Membrane Nanjing Tech UniversityNanjing 210009China

Ionic liquid(IL),1-butyl-3-methylimidazolium hexafluorophosphate([BMIM]PF6)as a new and environmentally friendly diluent was introduced to prepare poly(vinylidene fluoride)(PVDF)membranes via thermally induced phase separation(TIPS).Phase diagram of PVDF/[BMIM]PF6 was *** effects of polymer concentration and quenching temperature on the morphologies,properties,and performances of the PVDF membranes were *** the polymer concentration was 15 wt%,the pure water flux of the fabricated membrane was up to nearly 2000 L·m-2·h-1,along with adequate mechanical *** the increasing of PVDF concentration and quenching temperature,mean pore size and water permeability of the membrane *** results showed that PVDF membranes manufactured by ionic liquid(BMIm PF6)presented spherulite *** the PVDF membranes were represented asβphase by XRD and FTIR *** provides a new way to prepare PVDF membranes with piezoelectric properties.

关键词： Ionic liquid Poly(vinylidene fluoride)membrane Thermally induced phase separation

Membranes for extracorporeal membrane oxygenator(ECMO): History,preparation, modification and mass transfer

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Chinese Journal of Chemical Engineering 2022年第9期35卷 46-75页

作者： Ting He Songhong Yu Jinhui He Dejian Chen Jie Li Hongjun Hu Xingrui Zhong Yawei Wang Zhaohui Wang zhaoliang cui State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 210009China National Engineering Research Center for Special Separation Membrane Nanjing Tech UniversityNanjing 210009China Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM) Nanjing Tech UniversityNanjing 210009China Beijing Aerospace Changfeng Co. Ltd.Beijing 100854China

Extracorporeal membrane oxygenator(ECMO) has been in development for nearly 70 years, and the oxygenator has gone through several generations of optimizations, with advances from bubble oxygenators to membrane oxygenators leading to more and more widespread use of ECMO. Membrane is the core of a ECMO system and the working mechanism of membrane oxygenator depends on the membrane material,from PDMS flat membrane to PMP hollow fiber membrane, which have experienced three *** compatibility on the surface of the membrane material is very vital, which directly determines the use duration of the oxygenator and can reduce the occurrence of complications. The mechanism of mass transfer is the basis of oxygenator operation and optimization. This review summarizes the membrane development history and preparation technology, modification approaches and mass transfer theory in the process of oxygen and blood exchange. We hoped that this review will provide more ideas for the study of gas blood exchange membrane.

关键词： Extracorporeal membrane oxygenator Hollow fiber membrane Fabrication Surface modification Mass transfer

Zwitterionic monolayer grafted ceramic membrane with an antifouling performance for the efficient oil-water separation

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Chinese Journal of Chemical Engineering 2022年第2期35卷 227-235页

作者： Tianyu Zhang Qian Wang Wei Luan Xue Li Xianfu Chen Dong Ding Zhichao Shen Minghui Qiu zhaoliang cui Yiqun Fan State Key Laboratory of Materials-Oriented Chemical Engineering National Engineering Research Center for Special Separation MembranesCollege of Chemical EngineeringNanjing Tech UniversityNanjing 211816China Zhangjiagang Institute of Nanjing Tech University Suzhou 215699China

Enormous demands on the separation of oil/water(O/W)emulsions in various industries,such as petrochemical,food and pharmaceutical industries,are looking for high performance and energy-efficient separation *** membranes have been used to deal with O/W emulsions,for its outstanding characteristics of easy-operation,high-flux,and long-term ***,membrane fouling is still a challenge in the industrial application of ceramic ***,antifouling ceramic membranes were fabricated by grafting zwitterions on the membrane surface via an environment-friendly two-step grafting method,which improves the antifouling property and *** grafting of such zwitterion on the ceramic surface was assessed by the combination of FTIR and XPS *** importantly,the hydration can be formed by electrostatic interactions layer on the modified membrane,which was confirmed by TGA *** antifouling performance of prepared zwitterionic ceramic membranes in the separation of O/W emulsions was systematically *** results suggested that zwitterion can significantly improve the flux of ceramic ultrafiltration membrane,and can also improve antifouling property dramatically by reducing the irreversible fouling in the separation of O/W ***,zwitterionic ceramic membranes hold promising potentials as an antifouling,highly efficient and green method in the practical purification of the O/W emulsions.

关键词： Ceramic membrane Zwitterionic Anti-fouling Hydration layer Oil/water emulsion

Insight into fouling behavior of poly(vinylidene fluoride)(PVDF)hollow fiber membranes caused by dextran with different pore size distributions

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Chinese Journal of Chemical Engineering 2018年第2期26卷 268-277页

作者： Kailiang Zeng Jie Zhou zhaoliang cui Yue Zhou Chuan Shi Xiaozu Wang Liyue Zhou Xiaobin Ding Zhaohui Wang Enrico Drioli State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 210009China National Engineering Research Center for Speical Separation Membrane Nanjing Tech UniversityNanjing 210009China Nanjing Jiuying Membrane Technologies Co. Ltd.Nanjing 211899China Research Institute on Membrane Technology ITM-CNRVia Pietro Bucci 17/CRende 87036Italy

Membrane fouling is the key problem that occurs in membrane process for water treatment. However, how membrane microstructure influences the fouling behavior is still not clear. In this study, fouling behavior caused by dextran was deeply and systematically investigated by employing four poly（vinylidene fluoride）（PVDF） membranes with different pore sizes, ranging from 24 to 94 nm. The extent of fouling by dextran was accurately characterized by pore reduction, flux decline, and the change of critical flux. The result shows that membrane with the smallest pore size of 24 nm experienced the smallest fouling rate and the lowest fouling extent. As the membrane pore size increased, the critical flux ranges were 105-114, 63-73, 38-44 and 34- 43 L. m 2. h t, respectively. The critical flux and fouling resistances indicated that the fouling propensity in- creases with the increase of membrane pore size. Two pilot membrane modules with mean pore size of 25 nm and 60 nm were applied in membrane filtration of surface water treatment. The results showed that serious ir- reversible membrane fouling occurred on the membrane with pore size of 60 nm at the permeate flux of 40.5 L.m 2.h 1. On the other hand, membrane with pore size of 25 nm exhibited much better anti-fouling per- formance when permeate flux was set to 40.5, 48 and 60 L-m 2-h- 1.

关键词： PVDF membrane Fouling behavior Pore size distribution

Innovative hydrophobic/hydrophilic perfluoropolyether(PFPE)/polyvinylidene fluoride(PVDF)composite membrane for vacuum membrane distillation

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Chinese Journal of Chemical Engineering 2022年第5期35卷 248-257页

作者： Jun Pan Xianli Xu Zhaohui Wang Shi-Peng Sun zhaoliang cui Lassaad Gzara Iqbal Ahmed Omar Bamaga Mohammed Albeirutty Enrico Drioli State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemistry and Chemical EngineeringNanjing Tech UniversityNanjing 210009China National Engineering Research Center for Special Separation Membrane Nanjing Tech UniversityNanjing 210009China Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM) Nanjing Tech UniversityNanjing 210009China Center of Excellence in Desalination Technology King Abdulaziz UniversityJeddah 21589Saudi Arabia Mechanical Engineering Department King Abdulaziz UniversityJeddah 21589Saudi Arabia Research Institute on Membrane Technology ITM-CNRVia Pietro Bucci 17/CRende 87036Italy

Though membrane distillation(MD)has gained more and more attention in the field of desalination,the wetting phenomenon was still a non-negligible *** this work,a method combined dip-coating and UV in situ polymerization for preparing hydrophobic/hydrophilic perfluoropolyether(PFPE)/polyvinylidene fluoride composite *** composite membrane consisted of a top thin hydrophobic coating layer and hydrophilic substrate *** terms of anti-wetting properties,contact angle and liquid entry pressure of all composite membranes(except for those based on 0.45μm)exceeded 160°and 0.3 MPa,*** particular,the desalination performance was tested in vacuum membrane distillation tests by feeding 3.5%(mass)saline solution(NaCl)at 60℃.The composite membranes with larger support pore size and lower PFPE content had higher membrane distillation *** for stability tests(testing the 0.22μm membrane coated by 5%(mass)PFPE),the highest MD flux29.08 kg·m^(-2)·h^(-1) and stable salt rejection(over 99.99%)during the *** that,the effects of coating material concentration and pore sizes of substrate membrane were also investigated for surface morphology and topography,porosity,mechanical strength and pore size *** work provided a simple and effective alternative to prepare excellent hydrophobic composite membranes for MD applications.

关键词： Desalination Membrane surface coating Composite membranes Anti-wetting Vacuum membrane distillation