Article
Engineering, Environmental
Dongyi Yang, Cheng Chen, Jiqing Xie, Yuanqing Ye, Zhi Zhou, Huiyun Liao, Zhong Yao
Summary: In this study, a uniform zeolitic imidazolate framework/polydimethyl-siloxane (ZIF-8/PDMS) composite membrane was fabricated to improve the performance of pervaporation technology in recovering aromatic compounds from water. The optimized diffusion time was 24 h. ZIF-8/PDMS showed enhanced performance compared to pure PDMS, with increased permeation flux and improved separation factors. ZIF-8/PDMS also exhibited good performance in real lemon oil, achieving high recovery rates for linalool, neral, and geranial.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Review
Polymer Science
Kadavil Subhash Lakshmy, Devika Lal, Anandu Nair, Allan Babu, Haritha Das, Neethu Govind, Mariia Dmitrenko, Anna Kuzminova, Aleksandra Korniak, Anastasia Penkova, Abhimanyu Tharayil, Sabu Thomas
Summary: Pervaporation is a popular membrane separation technology with advantages of high efficiency, low energy consumption, and low cost. It is particularly suitable for the separation of hazardous substances from water bodies. This review focuses on the developments, mass transport in membranes, material selection, fabrication techniques, and applications of various membranes in the separation of chemicals from water.
Article
Engineering, Chemical
Tahreem Hafeez Butt, Rahma Tamime, Peter M. Budd, Wayne J. Harrison, Zufishan Shamair, Asim Laeeq Khan
Summary: Novel mixed matrix membranes (MMMs) were fabricated by incorporating bimetallic Zn/Co-ZIF nanoparticles into the prototypical polymer of intrinsic microporosity (PIM-1). The addition of Zn/Co-ZIF nanoparticles enhanced the hydrophobicity of the MMMs and improved the separation performance of ethanol/water and butanol/water mixtures. It was found that Zn/Co-ZIF/PIM-20 wt% membrane showed the highest separation and flux among all the membranes tested.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Yang Pan, Yanan Guo, Jiangying Liu, Haipeng Zhu, Guining Chen, Quan Liu, Gongping Liu, Wanqin Jin
Summary: In this study, a new composite membrane was designed by reconstructing the conformation of PDMS, significantly improving separation efficiency and flux. This strategy of designing membranes with customized permeants opens up new avenues for developing membranes for specific separation targets.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Engineering, Chemical
Xiaotong Cao, Kean Wang, Xianshe Feng
Summary: This study focused on the separation of phenolic compounds using a PEBA membrane, showing that permeation flux increased with higher feed concentrations, but the increase was less than proportional, leading to a decrease in enrichment factor. Additionally, both permeation flux and enrichment factor increased with higher temperatures. Different phenolic compounds exhibited varying permeabilities in the membrane.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Chemical
Yeon-Gyu Lim, Ji-Woong Kim, Chul-U Bak, Young-Deuk Kim
Summary: This study investigated the dehydration performance of vapor permeation (VP) and pervaporation (PV) processes using tubular NaA zeolite membranes experimentally and theoretically. The effects of key operating conditions on the performance of each process were studied, and mathematical models were developed to investigate the separation behavior. The study also proposed and evaluated an integrated system for the purification of volatile organic compounds (VOCs).
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Environmental
Qichao Sun, Ye Zhou, Lianying Wu, Yangdong Hu, Weitao Zhang
Summary: This paper discusses the separation of five azeotropic systems with different molecular weights through simulation and experiment. A stable PDMS/PVDF-PTFE membrane with favorable mechanical properties was prepared, and the dissolution and diffusion processes of the azeotropic systems were simulated. The separation performance of the membrane was investigated and validated through experimental results, demonstrating the accuracy of the simulation.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Sahar Kooshki, Majid Pakizeh, Rasoul Rahimnia
Summary: New mixed matrix membranes (MMMs) of poly(styrene-butadiene-styrene) (SBS) incorporated with hydrophobic ZSM-5 zeolite (calcinated and non-calcinated) were prepared and characterized. The membranes showed improved separation performance, with an increase in temperature leading to higher permeation flux and lower separation factor. The sample with 20 wt% calcinated zeolite (C.ZSM-5) exhibited the highest separation factor.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Ramatisa L. Ramos, Mateus F. Martins, Yuri A. R. Lebron, Victor R. Moreira, Beatriz G. Reis, Luiza B. Grossi, Miriam C. S. Amaral
Summary: Direct contact membrane distillation (DCMD) was evaluated for removing phenolic compounds and reducing the risks associated with micro-pollutants in water. The process showed a slight decay in permeate flux over time, with recommendations for maintaining a low recovery rate to avoid fouling issues and absence of ionic impurities in the permeate. Phenolic compounds retention rates were over 80% in raw water, indicating the technology's potential for removing these compounds with no potential health risks.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Environmental Sciences
Xianyu Liu, Hongxia Zhu, Li Gong, Ling Jiang, Daohui Lin, Kun Yang
Summary: The hierarchical pore structure of nanoporous carbon and the influence of gaseous toluene concentration on adsorption mechanism were investigated. The results showed that ultramicropore volume is positively correlated with breakthrough time and has a significant impact on toluene adsorption. Materials with higher adsorption affinity can achieve higher adsorption amounts at low concentrations.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Wen-Jing Wang, Wen-Yan Pan, Xue-Ling Wei, Bo Song, Yu-Ling Luo
Summary: This study synthesized compact X-type zeolite membranes with excellent separation performance using the in-situ heating method in hetero-alkali-metal cation synthesis solutions. The hetero-alkali-metal cations distorted the crystal structure and regulated the rates of crystal nucleation and growth, leading to the formation of compact zeolite membranes. This method provides a new approach for designing defect-free membranes with high permselectivity.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Analytical
Yongqiang Cheng, Maoke Liu, Bin Zhao, Li Yang, Cuilian Guo, Linbo Zhang
Summary: The sandwich temperature control membrane inlet mass spectrometer (STC-MIMS) presented in this study demonstrates improved analytical performance for the measurement of dissolved gases and VOCs in aqueous solution. The system allows for temperature compensation, increased sensitivity, reduced response time, and effective removal of memory effect. This new method has the potential for online analysis of organic pollution in aquatic environments.
Review
Biochemistry & Molecular Biology
Roberto Castro-Munoz, Grzegorz Boczkaj
Summary: Zeolites have been proposed for selective membrane separations due to their molecular sieving and stability, with important advances in pervaporation seen through their incorporation into polymer phases. This review aims to compile and elucidate the latest advances of zeolite applications in pervaporation membranes, focusing on relevant insights and findings in azeotropic separations and specific aided applications. Future prospects and recommendations for new researchers in the field are also provided based on the findings of this review.
Article
Engineering, Chemical
Rongsheng Ning, Zhongsen Yan, Zhenyu Lu, Qiankun Wang, Zengling Wu, Wenxin Dai, Gongduan Fan, Xianzhi Fu
Summary: Membrane distillation (MD) is a promising technology for wastewater reclamation, but organic contaminants can affect the quality of the permeate. Researchers have developed a photocatalytic membrane that enhances the removal of organic contaminants. Experimental results show that the photocatalytic MD system effectively removes pollutants and maintains stability.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Review
Environmental Sciences
Huaiyuan Zhao, Pu Meng, Shan Gao, Yuejun Wang, Pengfei Sun, Zhongbiao Wu
Summary: This review summarizes recent advances in catalysts for the simultaneous removal of NOx and VOCs, discussing the reaction mechanisms and interactions involved in NH3-SCR and VOCs catalytic oxidation, as well as the effects of catalyst acidity and redox properties. The insufficiency of bifunctional catalysts is pointed out, and potential solutions are proposed to enhance catalyst performance.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Engineering, Chemical
Wei Wei Gou, Wei Ting Gao, Xue Lang Gao, Qiu Gen Zhang, Ai Mei Zhu, Qing Lin Liu
Summary: Reasonable molecular structure design is particularly important for preparing anion exchange membranes (AEMs) with excellent alkaline resistance, competitive conductivity, and low swelling ratio (SR). In this study, ether-free fluoropolymers were synthesized via a superacid catalyzed reaction and long flexible multipiperidine cation side chains were grafted to different positions of the backbone. The position of the grafted ionic liquid affected the microphase separation structure and ion cluster size in the AEMs.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Chemical
Miao Deng, Tengfei Pei, Peng Ge, Aimei Zhu, Qiugen Zhang, Qinglin Liu
Summary: A versatile approach to prepare highly-permeable polyamide nanofiltration membranes is developed using an ultrathin sulfonated mesoporous interlayer. The sulfonic groups on the interlayer greatly facilitate the adsorption and storage of monomers, resulting in defect-free membranes with controlled thickness and surface roughness.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Chemical
Zhen Lin, Chuan Hu, Qinglin Liu, Qiugen Zhang
Summary: This work demonstrates a versatile strategy to create nanosheet-templated water channels in laminar graphene oxide membranes with controllable interlayer spacing. The resulting membranes have higher water permeance and good molecule separation properties compared to unintercalated membranes. This intercalation and sacrificing nanosheets strategy has higher potential in controlling d-spacing of laminar membranes than traditional intercalation.
Article
Chemistry, Multidisciplinary
Mingzhu Chi, Pingyun Zheng, Mingxin Wei, Aimei Zhu, Lubin Zhong, Qiugen Zhang, Qinglin Liu
Summary: In this study, the water permeability of the traditional polyamide composite nanofiltration membrane was enhanced by modifying it with a nanoporous TiO2 interlayer through a vacuum-assisted strategy. The modified membrane, with a crumpled structure, was fabricated by tuning the loading of nTiO2 nanoparticles. The hydrophilicity and porosity of the nTiO2 interlayer led to a reduction in the thickness of the polyamide layer. The modified membrane exhibited increased permeability and rejection rate, providing a solution for enhancing water permeability and extending the application of TiO2 in the modification of polyamide composite nanofiltration membranes.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Engineering, Chemical
Wei Ting Gao, Xue Lang Gao, Wei Wei Gou, Jia Jun Wang, Zhi Hong Cai, Qiu Gen Zhang, Ai Mei Zhu, Qing Lin Liu
Summary: Introducing bulky twisted binaphthyl units into the backbones of anion exchange membranes enhances both conductivity and stability, leading to well-defined microphase separation and well-developed ion-conductive highways. The performance of poly(binaphthyl piperidinium)-based AEMs demonstrates significantly higher OH- conductivity and excellent retention in harsh alkaline environments compared to traditional AEMs.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Chemistry, Physical
Zhi Hong Cai, Xue Lang Gao, Wei Ting Gao, Yvonne Shuen Lann Choo, Jia Jun Wang, Qiu Gen Zhang, Ai Mei Zhu, Qing Lin Liu
Summary: In recent years, the continuous application of superacid-catalyzed condensation reactions has led to the development of anion exchange membranes (AEMs) with excellent performance. One widely discussed method is the copolymerization of two aromatic compounds with piperidone via a superacid-catalyzed reaction to synthesize anionic conducting copolymers. Among them, the poly(N-alkylcarbazole-co-terphenyl N,N '-dimethylpiperidinium) (PCTP-n) membranes exhibit high dimensional stability, alkaline resistance, mechanical robustness, and OH- conductivity.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Engineering, Chemical
Yangcheng Dou, Xuecheng Dong, Yichang Ma, Peng Ge, Chong Li, Aimei Zhu, Qinglin Liu, Qiugen Zhang
Summary: This paper reports on a new fluorinated aromatic polymer, poly(biphenyl-trifluoroacetone) (PBT), for preparing high-performance hollow fiber ultrafiltration membranes. The PBT membranes exhibited excellent structure-performance relationship, with good scalability, membrane forming ability, separation performance, mechanical properties, and long-term stability.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Chemical
Yangcheng Dou, Guiqin Yi, Liyun Huang, Yichang Ma, Chong Li, Aimei Zhu, Qinglin Liu, Qiugen Zhang
Summary: In this study, TFC-HFMs with excellent performance were fabricated and exhibited high permeate flux, excellent separation performance, and good stability for ethanol dehydration, suggesting their potential application in the field.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Chemistry, Physical
Jia Hui Chen, Yvonne Shuen Lann Choo, Wei Ting Gao, Xue Lang Gao, Zhi Hong Cai, Jia Jun Wang, Qiu Gen Zhang, Ai Mei Zhu, Qing Lin Liu
Summary: In this study, Troger's base microporous anion exchange membranes (AEMs) with hyperbranched structure were prepared by superacid catalysis. The introduction of hyperbranched structure improved the water uptake and OH- transport of the AEMs, leading to enhanced performance in alkaline fuel cells.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Engineering, Environmental
Tengfei Pei, Miao Deng, Cai Ma, Hao Yan, Aimei Zhu, Liyi Ye, Qinglin Liu, Qiugen Zhang
Summary: In this study, loose nanofiltration membranes based on the interfacial polymerization reaction between glutaraldehyde and amine were developed for dye/salt separation. The resulting membranes showed excellent permeance, hydrophilicity, and dye/salt selectivity. The addition of sodium dodecyl sulfate helped regulate monomer diffusion behavior and improve membrane performance. The membranes also exhibited good anti-fouling properties, making them suitable for dye recycling and purification.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Wei Ting Gao, Xue Lang Gao, Yvonne Shuen Lann Choo, Jia Jun Wang, Zhi Hong Cai, Qiu Gen Zhang, Ai Mei Zhu, Qing Lin Liu
Summary: A series of novel crosslinked poly(binaphthyl-co-terphenyl piperidinium)s (QBNTPs) based on various dual-piperidinium crosslinkers are prepared as anion exchange membranes (AEMs) for alkaline fuel cells and water electrolysis. QBNTP-MP11 AEM exhibits exceptional OH- conductivity, suppressed swelling ratio, superior toughness, and outstanding durability. Moreover, it demonstrates high peak power density and excellent current density in alkaline water electrolysis, suggesting its potential application in fuel cells and electrolysis.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Jia Hui Chen, Xi Bin Yue, Yvonne Shuen Lann Choo, Ze Yu, Xi Hao Wang, Xue Lang Gao, Wei Ting Gao, Qiu Gen Zhang, Ai Mei Zhu, Qing Lin Liu
Summary: In this study, alkaline fuel cell membranes based on poly (crown ether) (PCE) with different aliphatic chain lengths were successfully designed and prepared. The membranes with longer hydrophobic aliphatic chain segments exhibited nanophase separation and ionic cluster formation. The QAPCE-16C membrane, with a carbon number of sixteen, showed a well-connected ion cluster region and a distinct micro-morphology separation. It demonstrated a hydroxide conductivity of 125 mS cm-1 at 80 degrees C and 95.77% ionic conductivity retention after immersion in a 1 M sodium hydroxide solution for 960 hours.
JOURNAL OF POWER SOURCES
(2023)
Article
Engineering, Environmental
Zhangtang Jiang, Guiqin Yi, Xin Yao, Yichang Ma, Xiangyu Su, Qinglin Liu, Qiugen Zhang
Summary: Anion exchange membrane water electrolysis (AEMWE) is a promising technology for large-scale green-hydrogen production. In this study, a poly(biphenyl alkylene) (PBPA) AEM was synthesized and used for highly efficient and durable AEMWE. The performance and durability of the PBPA-based AEMWE cell were significantly influenced by the ionomer contents and electrolyte type.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Jia Hui Chen, Yvonne Shuen Lann Choo, Xi Hao Wang, Ying Jie Liu, Xi Bin Yue, Xue Lang Gao, Wei Ting Gao, Qiu Gen Zhang, Ai Mei Zhu, Qing Lin Liu
Summary: A new type of anion exchange membranes (AEMs) with crown ether macrocycles in their main chains were prepared via a one-pot superacid catalyzed reaction. The size of crown ether cavity was found to influence the phase separation structure, ionic conductivity, and alkali resistance of the membranes. The poly (crown ether) (PCE) AEMs with dibenzo-18-crown-6-ether (QAPCE-18-6) showed a distinct phase separated structure and a maximum OH- conductivity of 122.5 mS cm-1 at 80 degrees C. QAPCE-18-6 exhibited good alkali resistance with a retention of 94.5% in OH- conductivity even under harsh alkali conditions. The hydrogen/oxygen single cell equipped with QAPCE-18-6 achieved a peak power density of 574 mW cm-2 at a current density of 1.39 A cm-2.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Ze Yu, Wei Ting Gao, Ying Jie Liu, Qiu Gen Zhang, Ai Mei Zhu, Qing Lin Liu
Summary: Recently, there has been focus on superacid-catalyzed ether-free aromatic polymers, whose development has been limited by the trade-off between dimensional stability and ionic conductivity of anion exchange membranes (AEMs). However, fluorinated AEMs can enhance OH- conductivity while maintaining dimensional stability. The PTF6-QAPTP AEM with more fluorinated groups shows the best performance with an OH- conductivity of 142.7 mS cm-1 and a swelling ratio (SR) of only 4.55% at 80 degrees C.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
