Article
Engineering, Chemical
Walid Ghamri, Patrick Loulergue, Irena Petrinic, Claus Helix-Nielsen, Maxime Pontie, Noureddine Nasrallah, Kamel Daoud, Anthony Szymczyk
Summary: The research found that chlorination affects the performance of biomimetic forward osmosis membranes, including altering the surface properties and hydrogen-bond network, and increasing negative surface charge density. With increasing free chlorine doses, membrane chlorination resulted in changes in reverse salt flux and water flux, but the rejection ability towards naproxen and diclofenac remained above 95.9% regardless of ageing conditions.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Chemical
Murielle Rabiller-Baudry, Patrick Loulergue, Jean Girard, Massoud El Mansour El Jastimi, Aurelie Bouzin, Marie Le Gallic, Alain Moreac, Philippe Rabiller
Summary: The study indicates that the resistance and residual irreversible fouling of the membrane in skim milk ultrafiltration are significantly influenced by the chlorine dose received during the membrane's service life, highlighting the importance of managing this factor at an industrial scale.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Review
Engineering, Chemical
Amanda Grylewicz, Sylwia Mozia
Summary: Polymeric membranes are commonly used in water and wastewater treatment, but pressure-driven membranes are prone to fouling and biofouling. On the other hand, forward osmosis membranes are less affected by fouling but have limited potential in wastewater treatment due to low permeation. The use of various nano-materials has been proposed to enhance membrane performance in terms of permeability, antifouling/antibiofouling resistance, and separation properties.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Environmental
Tamilarasan Palanisamy, S. Assiyeh Alizadeh Tabatabai, Tao Zhang, TorOve Leiknes
Summary: Chemical cleaning was conducted on PVDF hollow fiber UF membranes irreversibly fouled by cutting fluid using anionic, cationic and non-ionic surfactants. The study found that anionic surfactants showed better cleaning efficiency, while residual substances were observed on the membrane surfaces after cleaning with cationic and non-ionic surfactants.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Engineering, Chemical
Juan Jiang, Boya Ma, Chunwei Yang, Xiaoyue Duan, Qian Tang
Summary: A novel anti-fouling membrane (N-TiO2@PVDF) was developed by implanting a N-TiO2 photocatalyst into a PVDF membrane. The N-TiO2@PVDF membrane showed excellent anti-fouling performance and hydrophilicity, with higher water flux and pollutant rejection rate compared to PVDF. It also exhibited photocleaning function and the results showed that the degradation of organic pollutants by hydroxyl radicals (•OH) was the dominant mechanism.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Chemical
Vatsal Shah, Nicholaus Prasetya, Kang Li
Summary: The PVDF CCD membranes produced by the CCD method show higher pure water fluxes compared to conventional membrane manufacturing technology, but most are hydrophobic and prone to fouling. The PDA modification technique is used to improve hydrophilicity, but longer modification times lead to decreased permeability due to pore blockage. Shorter duration modification (2 hours) results in the best overall permeation performance in fouling studies.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Biochemistry & Molecular Biology
Duc-Trung Tran, Julie Mendret, Jean-Pierre Mericq, Catherine Faur, Stephan Brosillon
Summary: This study investigated the anti-fouling performance of PVDF-TiO2 composite membranes in different types of synthetic feed solutions. The results showed that inorganic fouling was unlikely to occur on the membranes, except for the presence of a small amount of Cu2+ coexisting with HCO3- in the feed solution. The membranes also showed strong resistance to sodium alginate fouling, but less resistance to humic acid fouling. The study also found that the membranes did not show advantages in terms of separation efficiency when operated in photo-filtration mode.
Article
Environmental Sciences
Kaikai Chen, Wei Zhao, Changfa Xiao, Hui Zhu, Qiming Wang
Summary: This study investigated the fouling mechanism of different polyvinylidene fluoride hollow fiber membranes in membrane bioreactor systems. The results showed that the homogeneous-reinforced polyvinylidene fluoride (HMR-PVDF) membrane exhibited better fouling resistance compared to the heterogeneous-reinforced polyvinylidene fluoride (HTR-PVDF) membrane.
Article
Engineering, Environmental
Charmaine Jia Mei Lye, Huijuan Xu, Rong Wang
Summary: The study demonstrates that reinforced PVDF hollow fiber membranes have excellent mechanical strength and resistance to chlorine, maintaining good membrane performance even after prolonged exposure to NaOCl.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Environmental Sciences
Abdullah Kizilet, Adem Yurtsever, Kevser Cirik, Ozer Cinar
Summary: Dynamic membranes are gaining attention as an alternative to conventional membranes due to their higher fluxes and lower fouling rates. Factors such as pore size, structure, and operating conditions affect the performance of dynamic membranes. This study focused on cake formation rates under different conditions and found that increasing fouling rates were related to decreased air sparging rates and higher food to microorganism ratios. The study also showed that the most stable operation was achieved with the 30 μm dynamic membrane, demonstrating its potential as an alternative to membrane bioreactors.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Rong Huang, Tong Zhang, Qiaoying Wang, Hongbo Gu, Zhen Zhou, Zhichao Wu, Zhiwei Wang
Summary: Membrane fouling can be effectively alleviated by using conductive membrane and external electric field in membrane bioreactor. This study investigated the degradation mechanisms and cleaning efficiency of organic foulants on composite conductive microfiltration membranes. It was found that electrochemical oxidation and sodium hypochlorite (NaClO) showed high degradation efficiency for bovine serum albumin (BSA). Electrochemical oxidation converted BSA into foams and flocs, while NaClO oxidation decomposed BSA into small molecules. The combination of electric fields and NaClO exhibited great membrane cleaning efficiency and reduced secondary pollution.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Dong Zou, Seong Min Jeon, Hyun Woo Kim, Joon Yong Bae, Young Moo Lee
Summary: PVDF membranes with inorganic layers showed improved mechanical strength and reduced membrane roughness, with tunable water permeance. These composite membranes exhibited enhanced separation performance and anti-fouling properties, with BSA rejection up to 95% and FRR of 72.2%. The in-situ grown inorganic layers effectively prevented fouling and were easily washed by hydraulic method.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Chemistry, Physical
Hengyang Mao, Jiayun Zhu, Shouyong Zhou, Jiaming Wang, Mengting Li, Ailian Xue, Meisheng Li, Yijiang Zhao, Wenbo Peng, Weihong Xing
Summary: In this study, magnetic palygorskite (m-Pal) nanofibers were obtained by anchoring Fe3O4 nanoparticles onto the surface of palygorskite. Composite membranes composed of poly(vinylidene fluoride) (PVDF) and m-Pal were prepared during a magnetic field assisted phase inversion process. The m-Pal can be elevated to the membrane surface due to magnetic force, thus adjusting membrane performance.
APPLIED CLAY SCIENCE
(2023)
Article
Environmental Sciences
Te-Cheng Wu, Chiung-Yu Peng, Hui-Min Hsieh, Chih-Hong Pan, Ming-Tsang Wu, Pei-Chen Lin, Chia-Fang Wu, Tusty-Jiuan Hsieh
Summary: The study focused on reducing aldehydes and environmental burden emitted from food stalls by designing a novel fume collector, which showed significant improvements in reducing aldehyde concentrations and emission rates at stall A and stall B. The new collector proved to be highly effective and cost-efficient, making it suitable for small-scale commercial kitchens and street-food stalls.
ENVIRONMENTAL RESEARCH
(2021)
Article
Engineering, Chemical
Ayesha Ilyas, Loren Timmermans, Maarten Vanierschot, Ilse Smets, Ivo F. J. Vankelecom
Summary: This study investigates the use of spray-modified non-solvent induced phase separation (s-NIPS) to create large patterned PVDF membranes and magnetically induced membrane vibration (MMV) to enhance their anti-fouling properties. The results show that patterned membranes reduce fouling rate and increase critical flux, while membrane vibration further improves anti-fouling potential and delays irreversible fouling.
JOURNAL OF MEMBRANE SCIENCE
(2022)
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)