Article
Engineering, Chemical
Xiuxiu Ren, Shengjie Yang, Rong Xu, Meng Guo, Weiqiu Huang, Ming Ding, Jing Zhong
Summary: By exchanging Na+ with mono- and divalent cations, the structure and performance of Na-mordenite zeolite membranes were modified, resulting in higher water capacity and improved separation efficiency in the dehydration of acetic acid by pervaporation.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Chemical
Peng Du, Jieyu Song, Xuerui Wang, Yuting Zhang, Jixian Xie, Gang Liu, Yongli Liu, Zhenwei Wang, Zhou Hong, Xuehong Gu
Summary: Efficient hydrogen separation is crucial from the cracked tail gas of ethylene plant. DD3R zeolite membranes were developed for this purpose, showing high selectivity and stability under harsh conditions. The efficient scale-up synthesis method led to the production of high-quality membranes suitable for industrial applications.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Chemical
Dovletjan Taymazov, Hao Zhang, Wen-Xuan Li, Ping-Ping Li, Fei Xie, Xin-Yu Gong, Sheng-Ning Zhang, Xiao-Hua Ma, Zhen-Liang Xu
Summary: This study presents the fabrication of a hybrid membrane based on molybdenum disulfide material for efficient dehydration of alcohols through pervaporation. The hybrid membrane showed a high permeation flux and separation factor in a specific alcohol aqueous solution. Various characterization techniques were used to investigate the morphology and physicochemical properties of the fabricated membrane.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Chemical
Siyu Pang, Zhihao Si, Yan Zhuang, Hanzhu Wu, Jan Baeyens, Xinmiao Zhang, Peiyong Qin
Summary: A continuous and controllable photo-curing system for the fabrication of hydrophobic PDMS hollow fiber membrane is proposed. The optimized PDMS hollow fiber membrane shows excellent separation performance in the pervaporation of 1-butanol.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Chemical
Hua Liu, Xuechao Gao, Shengxian Wang, Zhou Hong, Xuerui Wang, Xuehong Gu
Summary: High-silica CHA (SSZ-13) zeolite membranes show great potential for CO2 separation, but practical application is limited by high investment costs. In this study, SSZ-13 zeolite membranes were successfully synthesized on hollow fibers with different pore sizes, achieving good CO2/CH4 selectivity and CO2 permeance on membranes with 150 nm pores. Evaluation of gas permeation found that small molecules mainly pass through zeolitic pores, while larger molecules are more sensitive to non-zeolitic pores.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Chemical
Jia-Cheng Guo, Changlong Zou, Ching-Yu Chiang, Te-An Chang, Jiun-Jen Chen, Li-Chiang Lin, Dun-Yen Kang
Summary: The study introduces the use of NaP1 zeolite in membrane pervaporation, showing its high water diffusivity and adsorption selectivity, making it a promising material for alcohol dehydration processes, as demonstrated through experiments and simulations.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Shaowei Yang, Byunghyun Min, Qiang Fu, Christopher W. Jones, Sankar Nair
Summary: Viscosity-confined dry gel conversion (VCDGC) method is demonstrated for the fabrication of high-performance zeolite hollow fiber membranes. The synthesis and performance testing of small-pore CHA and medium-pore MFI membranes showcase the versatility and reliability of this method.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Engineering, Chemical
Yuting Zhang, Xinfeng Zhu, Shengze Chen, Jinyun Liu, Zhou Hong, Jiacheng Wang, Zhi Li, Xuechao Gao, Rong Xu, Xuehong Gu
Summary: A surface modification method was used to decorate NaA zeolite membrane with TiO2 nanoparticles for more stable water flux in pervaporation of polar aprotic solvents. The TiO2 layer on the membrane hindered aggressive solvent adsorption and allowed water permeation without significant loss in flux, improving separation stability significantly.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Review
Environmental Sciences
Yi Yang, Ruikun Xu, Chenyang Zheng, Yuxi Long, Shuo Tang, Zemin Sun, Binbin Huang, J. Paul Chen
Summary: Hollow zeolite fibers with hierarchical porosity have improved diffusion efficiency and are suitable for catalytic applications. Catalytic zeolite membrane fibers are commonly used due to their stability and selectivity. Further research is needed to develop self-assembly pure hollow zeolite fibers, catalytic substrate incorporated hollow zeolite fibers, hollow zeolite fibers with gradient multicomponent zeolites, and hollow zeolite fibers with nanoscale diameters.
Article
Engineering, Chemical
Peng Du, Xiuyuan Liang, Lekai You, Xuerui Wang, Jie Zhang, Xuan Ying, Zhou Hong, Yuting Zhang, Xuehong Gu
Summary: In this study, all-silica Decadodecasil 3 R (DD3R) zeolite membrane modules with small pore size were successfully fabricated. The use of a Teflon spiral column reduced the ozone detemplation time and improved the membrane performance in CO2 removal from natural gas.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Chemistry, Applied
Xiuxiu Ren, Huan Yu, Meng Guo, Rong Xu, Jing Zhong
Summary: In this study, a long alkyl chain-containing organosilica layer was utilized to modify silicalite-1 membranes, resulting in bi-layered BTESO/silicalite-1 composite membranes. After BTESO modification, the surface of the membranes became smoother, denser, and more hydrophobic. The modified membranes exhibited good separation performance in pervaporation, with increased ethanol flux and reduced water flux without sacrificing ethanol flux.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Engineering, Chemical
Hiroto Kunishi, Takeshi Hagio, Shintaro Wada, Yuki Kamimoto, Ryoichi Ichino
Summary: A novel nanoporous hexagonal tungsten oxide membrane was developed for separating water/acetic acid mixtures, with the nanopores on the c-plane allowing for effective separation of the molecules. The synthesis of c-plane-aligned dense NP-h-WO3 membranes via the hydrothermal method on porous ceramic supports was successfully achieved, demonstrating high potential for H2O/AcOH separation. The fabrication of these membranes with a high degree of c-plane alignment was found to be influenced by factors such as the presence of AcOH and the concentration of Na2WO4 in the precursor solution.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Chemistry, Applied
Gang Li, Shanhong Ma, Feng Ye, Yiwei Luo, Shuanshi Fan, Xuemei Lang, Yanhong Wang, Liang Zhou
Summary: The use of a T-type zeolite membrane for bio-oil dehydration through pervaporation shows high selectivity in removing water, but fouling in bio-oil leads to decreased permeation flux. After calcination at 220 degrees C, the fouled membrane can be effectively regenerated, demonstrating excellent reusability and chemical stability in the bio-oil system.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Engineering, Chemical
Seyed Mojtaba Mirfendereski, Jerry Y. S. Lin
Summary: A hydrophobic MFI zeolite membrane with high ethanol/water separation performance was successfully synthesized through a new method involving dual-layer seeding and varying-temperature secondary growth. The optimized membrane structure consists of a thin, fully inter-grown, and dense top zeolite layer for high selectivity, and a porous low inter-grown bottom zeolite layer to minimize resistance and aluminum transfer. The best supported MFI zeolite membrane exhibits a separation factor of 160 for ethanol/water pervaporation with a total flux of 3 kg m(-2) h(-1).
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Chemistry, Applied
Ryuma Tanaka, Yuta Ito, Yasuhisa Hasegawa, Takeshi Higuchi
Summary: This study focused on the application of LTA zeolite membranes in the dehydration of ethanol, demonstrating the successful preparation of thin membranes with high permeation flux and separation factor by optimizing crystal growth conditions. The key factor affecting the permeability of the membrane was identified as the change in crystallographic orientation caused by aging, as indicated by SEM observation and XRD analysis.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Engineering, Chemical
Yunfei Yu, Xue Yang, Chenchen Zhang, Jie Chen, Wei Lin, Jianqiang Meng
Summary: This study reports an environmentally friendly and simple approach for preparing double-network (DN) ion gel membranes with high strength and excellent gas separation performance. By optimizing crosslinking density, mass ratio, and the type and content of free ionic liquid, the mechanical and gas separation properties of the DN membrane are improved.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Si-qi Jiang, Qiang Gao, Xi-guang Li, Chao-zhu Deng, Jun Qiu, Xiang-nan Zhu
Summary: A dual-strengthening pretreatment method is proposed to remove PVDF more efficiently and enhance the leaching of LiCoO2. Experimental results show that dual-strengthening pretreatment can effectively remove PVDF and significantly improve the leaching efficiency compared to single pretreatment methods.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Zengchi Hu, Xiaoyu Wang, Xiaohui Zhang, Xue Li, Jiangbin Xia
Summary: The rapid fabrication of high-performance composite membranes based on CMPs using simple and low-cost methods is challenging. In this study, three CMPs-based composite membranes were rapidly fabricated with adjustable size using unidirectional diffusion synthesis. The microstructural design enhanced the rejection rates of the membranes and they showed strong hydrolytic resistance, thermal stability, and acid-base resistance. Electrostatic adsorption and the adjustable microstructures significantly varied the repellence of the membranes to different charged molecules.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Farzaneh Rouhani, Matineh Ayedi, Nasser Safari
Summary: Introducing defects into porous metal-organic frameworks is important for improving their adsorption performance. Quasi-MOFs, an underutilized variant of large-scale, fundamentally deficient MOFs, have been found to have substantial amounts of unsaturated metal sites to offset the drawbacks of MOFs. In this study, a quasi-MOF was produced using a water-stable MOF and demonstrated significantly improved phosphate adsorption capability due to the presence of defect sites.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Valentin Reungoat, Morad Chadni, Louis M. M. Mouterde, Fanny Brunissen, Florent Allais, Helene Ducatel, Irina Ioannou
Summary: This study focuses on the recovery of sinapic acid using liquid-liquid extraction assisted by a hollow fiber membrane contactor from an aqueous feed obtained through the hydrolysis of mustard bran. The screening of solvents of different chemical nature showed that all tested solvents had an extraction efficiency of more than 80% for pH < 5. Four solvents were selected for use in the hollow fiber membrane contactor, and the volatile solvents showed higher mass transfer coefficients compared to non-volatile solvents. The extraction efficiency was intensified by increasing the initial concentration of sinapic acid and the feed-to-solvent ratio. CPME was found to have optimal recovery efficiency at a phase ratio of 8:1, yielding 0.9 g of sinapic acid per liter of CPME used.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Takahiro Sakamoto, Takafumi Hanada, Hayate Sato, Mayu Kamisono, Masahiro Goto
Summary: The emergence of the battery society has led to a high demand for battery metals, resulting in a strain on their supply. This study introduces a novel technique using a hydrophobic deep eutectic solvent (DES) for leaching and recovering battery metals from low-grade nickel laterite ores. The DES enables selective leaching and recovery of the metals, offering a promising pathway for the extraction of critical battery metals.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Rongrong He, Jiarui Chen, Chunyao Zhang, Dan Lu, Lin Zhang, Tao He
Summary: Researcher has developed a method to quantify the charge density in nanofiltration (NF) membrane separation layer and applied it in NF membranes that can separate Mg2+ and Li+. The results showed that overcompensated amine groups played a major role, and there was a linear relationship between charge density and coating bi-layers or PAH layers.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Zhijian Zhang, Min Chen, Zhe Lin, Zhichao Yang, Yafeng Du, Zhihui Chen, Zhenhao Yang, Kongyin Zhao, Ligang Lin
Summary: Membrane technology plays an important role in molecular/ion separation processes, but faces challenges such as membrane fouling. This study introduces a new ion-crosslinking method to fabricate copper alginate hydrogel membranes with improved mechanical strength and antimicrobial capabilities. The membranes exhibit excellent separation performance and enhanced long-term molecule/ion separation through improved anti-swelling properties. Molecular dynamics simulations and life cycle analysis highlight the pore structure and environmental friendliness of the hydrogel membranes. These findings provide valuable insights for developing sustainable hydrogel membranes with stable performance and high separation efficiency.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Dongmei Liu, Aiying Guo, Yanling Qi, Zhixin Ji, Hongjuan Li, Zhiwei Zhang, Xinyue Zhang, Kunze Wu, Aijun Cai
Summary: In this study, a stable magnetic Mg/Mn-layered double oxide-doped biochar composite (MgMnLDO-MBC) was prepared and successfully used for the removal of antibiotics and bacteria from wastewater. The composite exhibited enhanced surface areas, adsorption sites, and free radicals, leading to improved catalytic activity. The effects of different factors on the removal efficiency were evaluated, and the composite showed good reusability.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Feng Wang, Zhaoyong Bian, Yaru Zhang, Wenchao Yu, Qiang Zhang, Hui Wang
Summary: In this study, a nanofibrous layered structure of Ff-Ti3C2Tx-Co3O4 was prepared by self-assembling nanofibrous Co3O4 with lamellar fluorine-free MXene (Ff-Ti3C2Tx). The Ff-Ti3C2Tx-Co3O4 exhibited excellent catalytic activity for degradation, resistant to ionic interference, and maintained high removal efficiency of sulfamethoxazole (SMX) in municipal wastewater. The rapid SMX degradation involved fast electron transfer in redox cycles with PMS and the generation of 1O2 via PMS ->center dot O2 -> 1O2. This work provides new insights into antibiotic degradation mechanisms and electron transfer based on PMS activation.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Weipeng He, Jiacheng Luo, Yujie Wu, Tianhao Luo, Chen Tang
Summary: This study comparatively evaluated the role of cationic, anionic, and nonionic polyacrylamides (PAMs) in ballasted flocculation of clay suspensions under different aluminum sulfate (AS) coagulant dosages. The selection of PAMs and AS dosage had a significant influence on the size and shear resistance of ballasted floc aggregates.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Lixian Wang, Lizhi Zhao, Didi Si, Zhixin Li, Huiqin An, Hui Ye, Qingping Xin, Hong Li, Yuzhong Zhang
Summary: Metalloporphyrin-based nanozymes integrated with poly (vinylidene fluoride) membrane show high catalytic activity and reusability for the decolorization of Congo Red dye in continuous flow process.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Yongfei Ma, Chenyu Zeng, Yongzhen Ding, Jiayi Tang, Ondrej Masek, Zhikang Deng, Rui Mu, Zulin Zhang
Summary: In this study, sludge-derived biochar (SBC) was functionalized with various iron salts to enhance its adsorption ability for sulfamethoxazole (SMX) and magnetic collection performance. Ball milling was further employed to treat the optimal iron salt functionalized SBC (MSBC), resulting in ball milled SBC (BMSBC) with improved adsorption performance for SMX. The dominant driving mechanism for SMX adsorption onto BMSBC was confirmed to be multiple physicochemical forces, including 7C-7C conjugation, pore filling, H-bonding, Fe-O complexation, and electrostatic interactions. BMSBC exhibited favorable adsorption ability for SMX in actual waters and could be easily collected within 1 min due to its magnetic sensitivity.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Jinglin Tan, Xiaohui Mao, Wenjihao Hu, Hongbo Zeng
Summary: This study investigates the influence of PDMS chain architectures on surface properties and reveals that PDMS coatings with looped structures exhibit superior hydrophobicity, self-cleaning, and water sliding compared to coatings with linear structures. Additionally, both looped and linear PDMS coated stainless steel mesh/polyester fibers show efficient separation of oil/water mixture.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Wei-Liang Chen, Chih-Chia Cheng, Chien-Hsing Lu, Jem-Kun Chen
Summary: This study designs a novel sandwich-structured capacitor that reduces the absorption time of pollutants using dielectrophoresis force. By coating graphene oxide on polystyrene microspheres as adsorbents and encapsulating them within the capacitor, the adsorption rate is significantly enhanced. Additionally, frequency manipulation allows for the recycling of adsorbents and concentration of dyes, minimizing secondary pollution.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)