Article
Engineering, Chemical
Zhen-Yuan Wang, Yi-Chen Wang, Wei-Jian Wang, Sheng-Nan Tao, Ya-Feng Chen, Mengmeng Tang, Dan-Dan Shao, Weihong Xing, Shi-Peng Sun
Summary: The research simplified the design strategy of composite hollow fiber nanofiltration membranes, producing ultra-thin active layer that increased mechanical flexibility and reduced material cost, while achieving chemical transition.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Environmental
Chuanfeng Wang, Yingbo Chen, Xiaoyu Hu, Pengfei Guo
Summary: A dual-layer PVDF loose nanofiltration hollow fiber membrane with desirable properties was designed via phase inversion process, demonstrating low MWCO and excellent separation performance.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Engineering, Environmental
Yaoyao Jiao, Junjie Yang, Jing Zhang, Jianxin Li, Shuhao Qin, Xiao Wu, Zhenyu Cui
Summary: A positively charged nanofiltration (NF) membrane was constructed to effectively remove heavy metal ions using a co-deposition and quaternization strategy. The membrane exhibited high retention rate, excellent water permeance, and outstanding separation performance for rare earth metal ions. The relationship between membrane surface potential, pore size, and rejection of heavy metal revealed the removal mechanism.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Engineering, Chemical
Sheng-Nan Tao, Yue Wang, Zheng-Jun Fu, Yi-Meng Wang, Qing-Lin Lu, Ming-Jian Tang, Wei-Jian Wang, Bhekie B. Mamba, Shi-Peng Sun, Zhen-Yuan Wang
Summary: An efficient NaClO activation method is developed to tailor the selective layer of cross-linked PI/PES dual-layer hollow fiber membranes, resulting in a negatively charged surface and a more open pore structure. These membranes show high separation efficiency and long-term stability for the separation of mono/divalent ions in industries.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Engineering, Chemical
Yi Yang, Shixiao Wang, Jianhang Zhang, Benqiao He, Jianxin Li, Shuhao Qin, Jingkui Yang, Jing Zhang, Zhenyu Cui
Summary: Efficient concentration and separation of heavy metal ions from wastewater is essential. This research successfully developed a double highly positively charged nanofiltration (NF) separation layer on the surface of hollow fiber membranes, allowing for effective removal of Ni2+, Cu2+, and Cr3+ while maintaining stability and anti-fouling properties.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Chemical
Ben-Qing Huang, Yong-Jian Tang, An-Ran Gao, Zuo-Xiang Zeng, Shuang-Mei Xue, Chen-Hao Ji, Chuyang Y. Tang, Zhen-Liang Xu
Summary: The dually charged nanofiltration (NF) membranes prepared by facile modification with diethylenetriamine (DETA) after interfacial polymerization showed ideal rejection for both Na2SO4 (98.2%) and MgCl2 (94.1%), with a pure water permeability of 17.0 L m(-2) h(-1) bar(-1). These membranes also exhibited high rejection to a series of heavy metals, demonstrating good potential for heavy metals removal.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Chemical
Peng Ge, Zhen Lin, Jiarui Yang, Chuan Hu, Qinglin Liu, Qiugen Zhang
Summary: This article presents a facile strategy to fabricate polyethylenimine-grafted polyethersulfone hollow fiber membranes (PSF-PEI HFMs) for efficient dye separation. Unlike traditional interfacial polymerization, these HFMs were directly prepared via quaternization of PEI with brominated polyethersulfone UF HFMs. The PSF-PEI HFMs exhibit ultra-high water permeance and outstanding rejection for dyes, while maintaining low rejections for inorganic salts. Additionally, they show excellent stability and antifouling abilities, making them highly promising for industrial applications in fast dye separation.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Engineering, Chemical
Sam B. Rutten, Moritz A. Junker, Lucia Hernandez Leal, Wiebe M. de Vos, Rob G. H. Lammertink, Joris de Grooth
Summary: Nanofiltration (NF) is a promising technology for treating water sources with increasing micropollutant (MP) concentrations. Understanding the influence of solution composition on filtration performance is important. This study investigated the impact of dominant salts on the removal of trace MPs by commercial hollow fiber NF membranes. The presence of a dominant salt significantly altered MP transport behavior, with a higher mobility of MPs observed in the dNF80 membrane.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Engineering, Environmental
Yu-Zhe Wu, Hua-Xiang Li, Zhen-Liang Xu, Ping Li, Zi-Ming Zhan, Ping-Ping Li, Sun-Jie Xu
Summary: In this study, TFN membranes doping with UiO-66 were used for the removal of CHC in groundwater. The mechanism of UiO-66 in the aqueous phase and the mass transfer of water were investigated through molecular dynamics simulation and dissolution-diffusion model. The TFN membranes showed high rejection of TCE and TCB and a high pure water flux, providing a solution for CHC removal and explaining the mechanism of doped nanoparticles in the separation process.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Shenyi Tang, Yaoyao Jiao, Feng Yan, Qingqing Qin, Shuhao Qin, Xiaohua Ma, Jianxin Li, Zhenyu Cui
Summary: A positively charged hollow fiber nanofiltration (NF) membrane with a bridging network structure was prepared using the polymer-anchored co-deposition method. The membrane showed excellent removal efficiency of high-concentration heavy metal ions while maintaining high pure water permeance. The underlying mechanism of heavy metal ion removal and the membrane's acid/base resistance, anti-fouling capacity, and long-term stability were also explained.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Biochemistry & Molecular Biology
Javed Alam, Arun Kumar Shukla, Lawrence Arockiasamy, Mansour Alhoshan
Summary: This study focuses on synthesizing and characterizing dual-layer sulfonated polyphenylenesulfone nanocomposite hollow fiber nanofiltration membranes with titanium dioxide nanoparticles. Advanced tools and methods were used to evaluate the properties and performance of the membranes. The addition of TiO2 significantly improved the pure water permeability, mechanical properties, and salt rejection performance of the membranes.
Article
Materials Science, Textiles
Chuanfeng Wang, Yingbo Chen, Meng Wang, Renhao Guo
Summary: A dual-layer PVDF loose nanofiltration hollow fiber membrane was designed and optimized through an online-coating device, and then cross-linked to improve solvent stability. The cross-linking process improved the stability in polar solvents with a slight decrease in thermal stability and mechanical properties. The prepared membranes showed excellent rejection of Rose bengal in various solvents and great stability for treatment of RB/ethanol solution, indicating their potential for organic solvent nanofiltration applications.
FIBERS AND POLYMERS
(2023)
Article
Engineering, Chemical
Furong Li, Gangxu Duan, Zhigang Wang, Dan Liu, Yifan Cui, Sibudjing Kawi, Shaomin Liu, Xiaoyao Tan
Summary: BaCe0.7Zr0.1Y0.2O3-delta/Ni-BaCe0.7Zr0.1Y0.2O3-delta dual-layer hollow fiber membranes prepared by a co-spinning/co-sintering method can moderately control hydrogen permeation and achieve high hydrogen recovery rate in low concentration hydrogen streams.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Chemical
Pengfei Li, Hongling Lan, Kuo Chen, Xiupeng Ma, Bingxin Wei, Ming Wang, Peng Li, Yingfei Hou, Q. Jason Niu
Summary: The novel positively charged aliphatic polyamide NF membrane (PEI-BTC) developed in this study shows superior physicochemical properties, higher rejection rate for MgCl2, and excellent heavy metal removal efficiency, indicating its potential for industrial applications in water softening and heavy metal removal.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Environmental Sciences
Ping Li, Yu-Xuan Li, Yu-Zhe Wu, Zhen-Liang Xu, Hai-Zhen Zhang, Peng Gao, Sun-Jie Xu
Summary: The novel eGO/PA-HFC membrane showed excellent performance in heavy metal removal, with systematic studies indicating great potential for wastewater treatment applications.
ENVIRONMENTAL RESEARCH
(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)