MATERIALS RESEARCH INNOVATIONS
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2022
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IF 0
Yiye Song,Ye Zhang,Hongjun Yang
Reverse osmosis (RO) membranes have been widely used in the field of membrane separation. However, most of the commercial RO membranes are fabricated based on a polysulphones- or polyethersulfone-modified polyethylene glycol terephthalate (PET) support, which are thick and exhibit poor solvent resistance. In this study, polyethylene (PE) battery membranes without any hydrophilic modification were directly used to prepare PE-RO membranes. The structures of the products were confirmed via attenuated total reflection Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy. The resulting RO membrane prepared with 0.05 wt.% of trimesoyl chloride and 2 wt.% of m-phenylenediamine exhibited a water flux of 12.61 L m−2 h−1 with a desalination (NaCl) rate of 98.6%. The thickness of the PE-RO membrane is 80% of the thickness of the traditional RO membranes and hence has a wider application as a separation membrane.
研究领域:
材料科学
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环境工程
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DOI
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Yanan Wang,Liuqian Yang,Dandan Ouyang,Dongxu Chen,Hui Zhu,Jiao Yin
Porous carbons have attracted great attention in capacitive deionization (CDI), benefiting from their high surface areas and abundant adsorption sites. However, the sluggish adsorption rate and poor cycling stability of carbons are still concerns, which are caused by the insufficient ion-accessible networks and the side reactions (the co-ion repulsion and oxidative corrosion). Herein, inspired by the blood vessels in organisms, mesoporous hollow carbon fibers (HCF) were successfully synthesized via a template assisted coaxial electrospinning strategy. Subsequently, the surface charge of HCF was modified by various amino acids (arginine (HCF-Arg) and aspartic acid (HCF-Asp)). Combining structure design and surface modulation, these freestanding HCFs present enhanced desalination rate and stability, in which the hierarchal vasculature facilitates electron/ion transport, and the functionalized surface suppresses the side reactions. Impressively, when HCF-Asp and HCF-Arg serve as cathode and anode respectively, the asymmetric CDI device provides an excellent salt adsorption capacity of 45.6 mg g −1 , a fast salt adsorption rate of 14.0 mg g −1 min −1 and a superior cycling stability up to 80 cycles. In short, this work evidenced an integrated strategy to exploiting carbon materials with outstanding capacity and stability for high-performance capacitive deionization .
研究领域:
材料科学
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环境工程
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产品关联
DOI
PubMed
高影响因子
DESALINATION
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2022
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IF 11.211
Zhao-Yu Ma,Chang Liu,Yu-Ren Xue,Cheng-Ye Zhu,Jian Wu,Zhi-Kang Xu
It is deemed as a silver bullet that the mass production of desalination membranes will solve the exacerbated water scarcity , which normally uses polyamide nanofilm as the perm-selective layer through interfacial polymerization . Although there have been significant breakthroughs in laboratory research in recent years, the same good results cannot all be reproduced owing to many differences between pilot tests and mass production, such as the use of organic solvents. Herein, a new perspective is proposed for elucidating the deep reason that viscous isoalkanes are welcomed in the industrial production of desalination membranes. Interfacial polymerization of amine and acyl chloride is dissected from the initial stage including the distribution and enrichment of monomers at the aqueous–organic interface, as well as the diffusion and solvation state of polyamide oligomers . The viscous isoalkanes not only suppress the diffusion of acyl chloride monomer but also provide a better solvation environment for polyamide oligomers. Polyamide nanofilms with reduced thickness and roughness are obtained with an enhanced cross-linking density. The corresponding desalination membranes exhibit improved water permeance (~3 Lm −2 h −1 bar −1 ) and rejection to NaCl (~99 %) that surpasses the performance of free-standing polyamide nanofilms recently reported. Our facile strategy will facilitate the transformation of laboratory results into the mass production of customized high-performance desalination membranes.
研究领域:
材料科学
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环境工程
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化学工程
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产品关联
DOI
高影响因子
CARBON
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2024
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IF 10.5
Thaw Tar Aye Lwin,Xi Chen,Mono Zaw,Soe Ko Ko Aung,Nyein Wint Lwin,Than Zaw Oo,Afzalshoh Qahramon Zarifzoda,Kwan San Hui,Fuming Chen
Freshwater scarcity is a critical global issue and desalination of brackish water and seawater technologies are regarded as effective solution to mitigate the increasing severity of water shortage. Flow-electrode capacitive deionization (FCDI) is an emerging electrochemical desalination technology capable of continuous deionization behavior. However, reducing energy consumption and enhancing desalination rate are now markedly needed for its advancement. Herein, we propose a FCDI system with energy consumption as low as 88.08 kJ mol −1 and a desalting rate of 1.75 μg cm −2 s −1 . This is achieved by using flow electrodes containing 0.03125 wt% conductive polymer, 5 wt% activated carbon/carbon black and 80 mM/80 mM ferricyanide/ferrocyanide at a current density 3 mA cm −2 (3.36 mA current for a 1.12 cm 2 active area). We further investigate the effects of polymer content, redox pair content, salt content and current densities on desalination performance. Seawater with a conductivity of 52.78 mS cm −1 was successfully desalinated to 0.50 mS cm −1 in continuous process. This research provides a promising approach to enhance FCDI system by achieving a low energy consumption and high salt removal rate, representing a significant advancement in continuous electrochemical desalination technology.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Small
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2016
·Vol. 12
·期 36
·5034-5041
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IF 8.315
Yuzhang Zhu,Wei Xie,Shoujian Gao,Feng Zhang,Wenbin Zhang,Zhaoyang Liu,Jian Jin
Fabricating nanofiltration (NF) membranes with high permeating flux and simultaneous high rejection rate for desalination is rather significant and highly desired. A new avenue is reported in this work to design NF membrane by using polydopamine wrapped single-walled carbon nanotube (PD/SWCNTs) ultrathin film as support layer instead of the use of traditional polymer-based underlying layers. Thanks to the high porosity, smooth surface, and more importantly optimal hydrophilic surface of PD/SWCNTs film, a defect-free polyamide selective layer for NF membrane with thickness of as thin as 12 nm is achieved. The obtained NF membrane exhibits an extremely high performance with a permeating flux of 32 L m −2 h −1 bar −1 and a rejection rate of 95.9% to divalent ions. This value is two to five times higher than the traditional NF membranes with similar rejection rate.
研究领域:
材料科学
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环境工程
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DESALINATION
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2022
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IF 11.211
Kun Liu,Bingbing Chen,Aihu Feng,Jiao Wu,Xuebing Hu,Jianer Zhou,Yun Yu
The development of low cost, naturally sustainable, and high-performance electrode materials is the primary issue that determines the large-scale application of capacitive deionization (CDI). In this work, the nitrogen-doped activated porous carbon decorated by 3D interconnected graphene (NAPC/G) was synthesized by pre-carbonization and KOH activation of soy milk and graphene oxide composite gel (graphene tofu). The NAPC has an ultra-high specific surface area (SSA) of 2993.5 m 2 g −1 , rich micro-mesoporous structure, and good hydrophilicity . In addition, the 3D graphene network enhances the conductivity of the composite. Therefore, benefited from the synergetic effect of abundant ions adsorption sites and improved conductivity, the specific capacitance of NAPC/G electrodes is up to 370 F g −1 and maintains capacitance retention of 97% after 3000 cycles. For CDI electrode materials, the salt adsorption capacity (SAC), desalination rate, and cycle stability are the three important parameters. In this work, the NAPC/G electrode achieves an high SAC of 38.5 mg g −1 , large desalination rate of 6.6 mg g −1 min −1 and good cycle stability that desalination performance remains 93.5% after 50 cycles. This research provides an effective way to promote the sustainable large-scale application of CDI.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Chen Li,Ketong Song,Chunxiao Hao,Wanting Liang,Xiaoyun Li,Wenjin Zhang,Ying Wang,Yuefei Song
A novel anti-fouling cation exchange membrane (CEM) of sulfonated polybenzimidazole (S-PBI) was fabricated by the polymer bulk grafting modification of poly (4,4′-diphenyl ether-5,5′-bibenzimidazole) with sodium styrene sulfonate . FTIR, TGA , XPS, SEM and AFM were used to characterize membrane properties and the results showed that the ion exchange capacity and hydrophilicity of S-PBI increased with increased degrees of grafting and the electric resistance decreased accordingly. When the mass ratio of O-PBI/SSS was 1:4, the electric resistance of S-PBI-4.0 was 4.5 Ω·cm 2 , while the ion exchange capacity was 2.3 meq/g. The ED experiment with the S-PBI-4.0 membrane exhibited good desalination rate (>96 %), high current efficiency (80.73 %) and low energy consumption (1.13 kW·h/kg), which were very close to the results of a commercial CEM (Neosepta CMX). What's more, because of its good hydrophilicity, the S-PBI-4.0 membrane had better anti-fouling ability than Neosepta CMX, which was manifested as less resistance increase after membrane fouled by bovine serum albumin and smaller resistance after membrane cleaned by deionized water . These results demonstrate that the S-PBI-4.0 membrane is an appropriate candidate CEM and helpful to expand the application of ED in high-salinity organic industrial wastewater treatment .
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
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IF 21.1
Minzhang Li,Man Liang,Wei Wang,Beichi Luo,Yanhong Ji,Longzhang Dong,Lu Guo,Danling Tang,Guangguo Ying,Fuming Chen
Electrochemical desalination offers a promising route to address water scarcity, but current methods often face limitations in salt removal rate and capacity. This study introduces an ultrafast electrocatalytic desalination system that leverages the electrochemical reduction of CO 2 to formate (CO 2 RR) to drive efficient salt removal. The optimized bimetallic Sn/Cu-based polyphthalocyanine (Sn 2 Cu 1 PPc) exhibits exceptional CO 2 RR performance, achieving a peak FE formate of 90.3 % at −1.0 V vs. RHE and a j formate of 84.8 mA cm −2 . In-situ spectroscopic analysis and density functional theory (DFT) calculations reveal that the incorporation of Cu-N 4 units into the Sn-based polyphthalocyanine (SnPPc) promotes CO 2 adsorption and facilitates active hydrogen provision, leading to the observed enhancement in CO 2 RR activity. Using the Sn 2 Cu 1 PPc catalyst, our system achieves a salt removal rate of 1701.3 μg cm −2 min −1 and a formate production rate of 0.79 mmol h −1 cm −2 when treating natural seawater, resulting in potable water with 99.06 % salt removal efficiency. This performance is enabled by a high current density (∼70 mA cm −2 ) during CO 2 RR, which significantly enhances ion transport across the membranes, making this one of the most effective desalination approaches reported. This work demonstrates the potential of coupling CO 2 RR with desalination for sustainable water production and CO 2 mitigation, while also advancing the design of efficient Sn-based electrocatalysts for formate production.
研究领域:
电化学
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环境科学
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材料科学
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能量转换
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水处理
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2024
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IF 3.7
Qianru Kang,Yiwei Zhai,Fangbo Zhao,Liu Yang,Ye Yang,Hee-Deung Park,Zhiguo Li,Hongxu Chen,Gaohui Sun
To address the issues of low photothermal conversion efficiency, salt deposition and biological contamination in solar-powered desalination, we have developed nanofibrous membranes composed of an optimized ratio of silver-loaded graphene oxide (GO-Ag) composites and polyvinyl alcohol/chitosan (PVA/CS), using a simple and productive electrospinning technique. The synergistic effect of GO and Ag significantly enhanced the photothermal conversion efficiency of the dual-photothermal PVA/CS/GO-Ag-4% electrospun nanofiber membranes (EFMs), which achieved the pure water evaporation rate of 1.67 kg m −2 h −1 and photothermal conversion efficiency of 93.3% under 1 sun (1 kW m −2 ). Notably, 97% of optical energy is converted to heat when the PVA/CS/GO-Ag-4% EFMs were placed on a homemade evaporation device, achieving up to a simulated seawater evaporation rate of 1.64 kg m −2 h −1 under 1sun, with a desalination rate of 99.99%. More importantly, larger area EFMs are easier to prepare compared to other morphologies of solar evaporators, and larger membranes can be placed on outdoor evaporation units for large-scale effective desalination of seawater used to collect fresh water under natural light. Furthermore, PVA/CS/GO-Ag-4% EFMs exhibited outstanding antibacterial performance against Escherichia coli and Staphylococcus aureus . Considering these strengths, the PVA/CS/GO-Ag-4% EFMs has considerable application potential in solar-driven desalination to solve water crises.
研究领域:
材料科学
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环境工程
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纳米技术
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水处理
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）