Article
Engineering, Chemical
Zi-Ming Zhan, Yong-Jian Tang, Ka-Ke Zhu, Shuang-Mei Xue, Chen-Hao Ji, Chuyang Y. Tang, Zhen-Liang Xu
Summary: Surface modification via heat curing and grafting monoethanolamine (MEA) can enhance the pure water permeability and Na2SO4 rejection of polyamide nanofiltration membranes. The optimized membrane modified with 0.5 wt% MEA showed high Na2SO4 rejection and negative NaCl rejection when treating a mixed salt solution. This study provides insights for developing high permselectivity NF membranes through surface modification.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Chemical
Nawshad Akther, Yuqing Lin, Shengyao Wang, Sherub Phuntsho, Qiang Fu, Noreddine Ghaffour, Hideto Matsuyama, Ho Kyong Shon
Summary: The study demonstrated that growing an ultrathin hydrophilic silica layer on the PA surface can improve the antifouling property of TFC membranes without compromising membrane selectivity. The silica-modified TFC FO membranes displayed higher water flux and excellent stability under various cleaning conditions compared to pristine membranes.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Chemical
Lin Wang, Yakai Lin, Yuanhui Tang, Dan Ren, Xiaolin Wang
Summary: AEP-TMC membranes with tunable surface and different separation capabilities towards differently charged salts and dyes were successfully fabricated through interfacial polymerization. These membranes showed good water permeabilities and promising stabilities, indicating great potential for practical applications in separating different charged components.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Environmental
Zongyao Zhou, Qun Wang, Yiwen Qin, Yunxia Hu
Summary: A free-standing polyamide film is fabricated by removing the polysulfone support from a thin-film composite membrane. The structure parameter of the film is measured to be 24.2 +/- 12.6 μm, which is about 87 times its film thickness. The decline in water flux of the film is attributed to the internal concentration polarization of the polyamide film. The asymmetric hollow structures of the polyamide layer with dense crusts and cavities are proposed as the cause of the occurrence of the internal concentration polarization. Adjusting the structures of the film can reduce the structure parameter and mitigate the effect of internal concentration polarization.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Review
Engineering, Chemical
Pei Sean Goh, Kar Chun Wong, Tuck Whye Wong, Ahmad Fauzi Ismail
Summary: Polyamide thin film composite membranes dominate the reverse osmosis market, but chlorine-induced degradation is a weakness. Various strategies have been established for membrane material optimization and surface modifications to address this issue, but challenges and future directions still exist.
FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING
(2022)
Article
Chemistry, Physical
Yamin Li, Shengwei Sun
Summary: In this study, a commercial polyamide reverse osmosis membrane was modified by surface gelation using sodium alginate as a coating agent. The modified membrane exhibited improved hydrophilicity, smoothness, negative charge, and slightly improved selectivity and permeability. Additionally, the modified membrane showed good durability and antifouling performance.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Engineering, Chemical
P. S. V. Vaishnavi, Soumitra Kar, A. K. Adak, Vandan Nagar, Vishal Singh, A. K. Debnath, Parag R. Nemade
Summary: This study focused on the modification of a thin film composite nanofiltration (TFC NF) membrane with amine to enhance its anti-biofouling properties. The surface of the membrane was grafted with graphene oxide (GO) using three different linkers. The GO-grafted membranes showed improved chlorine stability, reduced biofouling tendency, lower flux decline during seawater filtration, and enhanced hexavalent chromium rejection. The study also revealed that the improved chlorine stability was attributed to intermolecular hydrogen bonding between GO and the membrane structure, while the enhanced resistance to biofouling and lower flux decline were attributed to the hydrophilic nature of GO.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Engineering, Chemical
Petr Stanovsky, Monika Benkocka, Zdenka Kolska, Miroslav Simcik, Petr Slepicka, Vaclav Svorcik, Karel Friess, Marek C. Ruzicka, Pavel Izak
Summary: Membrane separations for biogas upgrading can be improved by activation and grafting methods, with UV activation leading to significantly increased gas permeability. RO membranes grafted with cysteamine after UV activation showed a 100% increase in permeability, outperforming TFC RO membranes activated by diode discharge plasma.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Environmental
Wei Chen, Mingxiang Liu, Mingmei Ding, Lei Zhang, Shibao Dai
Summary: Membrane separation technology has been successfully used to obtain clean permeate in polluted water environments. However, the presence of emerging contaminants like PFAS compounds in water treatment processes remains a concern. A study has found that a thin-film composite membrane with a hyaluronic acid interlayer can effectively remove trace amounts of PFAS under various operating conditions. The study also used molecular dynamics simulations to understand the mechanism of PFAS removal and found that the hyaluronic acid interlayer can facilitate the formation of water transport pores with good rejection performance for PFAS.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Nanoscience & Nanotechnology
Shuangqiao Han, Zhaohuan Mai, Zheng Wang, Xiang Zhang, Junyong Zhu, Jiangnan Shen, Jingtao Wang, Yong Wang, Yatao Zhang
Summary: Covalent organic frameworks (COFs) have the potential to be a fast and efficient solution for molecular separation due to their orderly arranged pores and regulatable pore apertures. This study utilized a synthesized COF to modulate the physicochemical properties of polyamide membranes, resulting in improved water permeability and ion selectivity.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Biochemistry & Molecular Biology
Katsiaryna S. Burts, Tatiana Plisko, Vladimir G. Prozorovich, Galina B. Melnikova, Andrei I. Ivanets, Alexandr Bildyukevich
Summary: The modification of the polyvinyl alcohol (PVA) selective layer of thin film composite (TFC) membranes using aluminosilicate (Al2O3•SiO2) nanoparticles improved the structure and pervaporation performance. PVA-Al2O3•SiO2/polyacrylonitrile (PAN) thin film nanocomposite (TFN) membranes were developed for the separation of ethanol/water mixtures, resulting in increased hydrophilicity and improved stability compared to the reference membrane.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Engineering, Chemical
Zhenhua Lue, Guoliang Ding, Meihong Liu, Sanchuan Yu, Congjie Gao
Summary: In this study, a new coating layer of polyvinyl alcohol (PVA)/polyquaternium-10 (PQ10) was developed on the surface of polyamide-based reverse osmosis (RO) membrane. Permeation tests showed that the incorporation of PQ10 into PVA significantly enhanced the water permeation ability of the coating layer. The coated membrane exhibited excellent anti-fouling performance and improved durability against chemical agents.
Article
Engineering, Chemical
Yu Jie Lim, Kunli Goh, Gwo Sung Lai, Yali Zhao, Jaume Torres, Rong Wang
Summary: The nanoscale characteristics of the polyamide layer play a crucial role in the desalination performance of thin-film composite reverse osmosis membranes. This study highlights the importance of understanding the polyamide characteristics and formation mechanisms for further advancements in TFC membrane performance. Differences in physicochemical properties of polyamide layers formed on different support membranes with similar surface pore properties were observed, suggesting that the support membrane chemistry influences the interfacial polymerization reaction and polyamide formation, ultimately affecting the nanoscale features of the polyamide layer.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Chemical
Ruth Habte Hailemariam, June-Seck Choi, Mekdimu Mezemir Damtie, Hojung Rho, Kwang-Duck Park, Jonghun Lee, Yun Chul Woo
Summary: This study focused on improving the performance of polyamide thin film composite membranes through co-solvent-assisted interfacial polymerization. The results showed that adding co-solvent can enhance water flux performance of the membrane without sacrificing salt rejection. The study demonstrates the potential of CAIP membranes for brackish water desalination and water treatment.
Article
Biophysics
Mojtaba Khorramnezhad, Babak Akbari, Mahdokht Akbari, Mahshid Kharaziha
Summary: The study aimed to surface modify PCL film by gelatin coating to improve cell attachment. Results demonstrated that gelatin modification significantly enhanced mechanical properties and biological characteristics of PCL film, providing a promising approach for the development of bone tissue engineering scaffolds.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2021)
Article
Energy & Fuels
Kalpesh V. Modi, Dhruvin L. Shukla, Dipak B. Ankoliya
JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME
(2019)
Article
Engineering, Environmental
Mayur R. Raviya, Maulik V. Gauswami, Hiren D. Raval
WATER ENVIRONMENT RESEARCH
(2020)
Article
Environmental Sciences
Ashish R. Kavaiya, Hiren D. Raval
Summary: The study showed that surface modification of Thin Film Composite Reverse Osmosis membranes with crosslinkers significantly improved membrane performance, such as increased flux and salt-rejection, reduced organic fouling, and enhanced removal of heavy metal ions.
ENVIRONMENTAL TECHNOLOGY
(2022)
Article
Polymer Science
Ashish Srivastava, Hiren D. Raval
Summary: In this study, polysulfone-based mixed matrix membranes with hydrophilic CuO and ZnO nanomaterials as antibacterial agents were synthesized and characterized. The membranes showed increased permeate flux and higher BSA rejection rates. The modified membranes exhibited significantly lower biofilm growth compared to pure polysulfone membranes in a membrane fouling simulator, demonstrating good anti-biofouling properties.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Green & Sustainable Science & Technology
Dipak Ankoliya, Anurag Mudgal, Manish Kumar Sinha, Philip Davies, Edxon Licon, Ruben Rodriguez Alegre, Vivek Patel, Jatin Patel
Summary: The performance of the electrodialysis system is influenced by water quality data, stack configuration, and flow characteristics. The total cost is affected by the interplay between linear flow velocity and cell-pair thickness. System design under specific conditions can impact the overall production cost.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Polymer Science
Hiren D. Raval, Richa Modi, Kaushik Dave, Mayur Raviya
Summary: This article presents a novel approach to enhance the selectivity of degraded reverse osmosis membranes by binding a chitosan-tannic acid layer above the degraded membrane. The results showed significant improvement in selectivity with the use of chitosan-tannic acid treatment.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Materials Science, Composites
Ashish Srivastava, Mayur Raviya, Hiren Raval
Summary: A novel mixed matrix membrane was prepared by blending polysulfone with two-dimensional boron nitride. The resulting nanocomposite membrane exhibited good dispersion and modified membrane properties. It showed improved water flux and albumin rejection up to a certain concentration of boron nitride. The membrane also demonstrated temperature responsiveness and good water uptake capacity, indicating potential applications in high-temperature separation.
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
(2023)
Article
Environmental Sciences
Bhaumik Sutariya, Hiren Raval
Summary: This article studies a new system design and operational method for a domestic reverse osmosis system, which allows for tuning the permeate quality, achieving high water recovery, and reducing energy consumption. The system is particularly useful for low salinity feed with trace amounts of heavy metals.
WATER AND ENVIRONMENT JOURNAL
(2022)
Review
Engineering, Environmental
Richa Modi, Ashish R. Kavaiya, Piyush B. Vanzara, Hiren D. Raval
Summary: Zero-liquid-discharge effluent treatment technologies are gaining popularity due to environmental concerns, but incur significant capital and energy consumption costs. It is important for industries to develop cost-effective technologies, with governments enforcing zero-discharge norms for certain plants. The use of membrane technology can reduce energy consumption and minimize effluent discharge.
JOURNAL OF ENVIRONMENTAL ENGINEERING
(2022)
Article
Polymer Science
Ritika Sharma, Prashant Galav, Hiren D. D. Raval
Summary: Nanocomposite TiO2/polysulfone membranes were prepared and evaluated for advanced water treatment and removal of surfactant and dye from water. The nanocomposite membranes showed enhanced antifouling properties. Characterization techniques including SEM, EDX, AFM, and TEM were used to study the particles and fabricated membranes. The membranes demonstrated improved resistance to fouling, and promising results were obtained in separating Congo red dye and Triton X-100 surfactant. The incorporation of TiO2 nanoparticles led to increased tensile strength but decreased elongation at break, attributed to reduced pore size and altered surface characteristics.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Engineering, Civil
Dipak Ankoliya, Anurag Mudgal, Manish Kumar Sinha, Vivek Patel, Jatin Patel
Summary: Hybridization of electrodialysis (ED) and batch reverse osmosis (BRO) processes is studied to reduce brine volume and water production cost. A simple hybrid process layout is preferred, where ED process is kept in the reject stream of BRO process and permeate from both processes is mixed. The water production cost from the hybrid ED-BRO process is found to be $0.22/m3 of freshwater at a feed concentration of 1,100 ppm.
AQUA-WATER INFRASTRUCTURE ECOSYSTEMS AND SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Rikarani R. Choudhury, Jaydevsinh M. Gohil, Hiren Raval
Summary: This research introduces the concept of thin film composite (TFC) membranes prepared using a novel functional copolymer, PVA-co-SSA. A polysulfone ultrafiltration membrane was coated with a PVA-co-SSA solution, which was then crosslinked with glutaraldehyde (GA) aqueous solution. The characteristics of the TFC membranes were evaluated based on the concentrations of PVA-co-SSA and GA solution used for preparation. The composite membranes exhibited a hydrophilic and smooth surface, with a thickness of the selective layer ranging from 123 to 276 nm. The membranes showed high rejection of MgSO4 (74.8%) and moderate rejection of NaCl (33.75% to 54%) at different operating pressures.
SEPARATION SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Environmental
Bhaumik Sutariya, Aabha Sargaonkar, Bhupendra Kumar Markam, Hiren Raval
Summary: The study introduced an innovative static mixer type feed spacer design, which improved mass transfer efficiency through optimization of geometry and fluid flow velocity, allowing operation at lower Reynolds numbers for increased permeate recovery.
CHEMICAL ENGINEERING JOURNAL ADVANCES
(2022)