APPLIED SURFACE SCIENCE
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2017
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IF 3.387
Hao-Ran Zuo,Gui-Ping Cao,Meng Wang,Huan-Huan Zhang,Chen-Chen Song,Xu Fang,Tao Wang
Forward osmosis (FO) has received great interest for its considerable potential in a wide range of fields. In this work, the morphology and performance of FO membrane were regulated by adjusting the atmosphere humidity ( H C ) of casting procedure. The polysulfone support layer was casted under various atmosphere humidity levels ranging from 40% to 80%. By multi-techniques such as SEM, AFM, and XPS, it was proved that the atmosphere humidity had modified the surface morphology and thickness of the skin layer in support layer, which contributed up to 90% of the structure parameter, resulting in distinct morphology, thickness, and cross-linking degree of active layer. The active layer with sparse bead-like wrinkles on the smooth surface of support layer casted at H C = 65% showed the highest water permeability [26.9 (L/m 2 h MPa)] and considerable low salt permeability [0.0390 (L/m 2 h)]. It was found that the water flux of FO-65 was 27% and 46% higher than that of FO-80 in AL-DS and AL-FS mode, respectively, and the salt rejection was as high as 98%. Our work highlighted the importance of considering the effect of atmosphere humidity during casting when design an FO membrane for appropriate performance.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
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2022
·
IF 13.4
Nan Sun,Pengjia Dou,Wentao Zhai,Hailong He,Long D. Nghiem,Vahid Vatanpour,Yuebiao Zhang,Changkun Liu,Tao He
To extract lithium from salt lake brine involves a process of separation and concentration. After separating lithium from brine, the lithium ion concentration is generally a few hundred mg/L which is far below the required 20-30 g/L (as Li + ) before precipitation as lithium carbonate. The concentration step of a lithium enriched brine is crucial but highly energy-intensive. Spontaneous forward osmosis (FO) technology offers the possibility for concentrating lithium ions with low energy. Because the concentrating process involves both feed and draw solution with very high salinity, it is highly desirable to have a high performance FO membrane with a low structural parameter as well as a high rejection to ions. In this work, thin polyethylene separator supported FO (PE-FO) membranes were prepared and post-treated stepwise with benzyl alcohol (BA) and hydraulic compaction. The effect of the post-treatment on the FO performance was systematically analyzed. Excellent FO performance was achieved: the water flux and reverse salt flux selectivity were 66.3 LMH and 5.25 L/g, respectively, when the active layer is oriented towards the 0.5 M NaCl draw solution with deionized water as the feed. To the best of our knowledge, this FO flux is the highest ever reported in the open literature under similar test conditions. Applied in concentrating lithium enriched brine, the membrane showed superior water flux using saturated MgCl 2 as draw solution. A new FO model was established to simulate the water flux during the concentration process with good agreement with the experimental results. The promising results using PE-FO membrane for lithium enrichment opens a new frontier for the potential application of FO membranes.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Dibakar Pandaya,Ming-Xiao Zhang,Zhen-Liang Xu,Tehreem Ayaz,Mahesh Kumar Joshi,Yan Zheng,Tian-Xiang Ren,Liang Cheng,Jundi Wang
Electrospun nanofiber membranes are promising support for forward osmosis (FO) composite membranes due to their high porosity and low tortuosity. However, achieving a defect-free selective layer is challenging due to the large interconnected pores of nanofiber support. In this study, the potential of polyurethane (PU)/chitosan (CS) blend nanofibrous membrane as substrate for high-performance FO membrane was investigated. PUCS blend solutions were electrospun at optimized compositions to fabricate smooth and bead free nanofibrous membranes. The resulting PUCS nanofibrous membranes exhibited superior mechanical strength compared to pristine PU due to strong interaction between PU and CS at molecular level and their spider-net-like morphology. Thermal pressing enhanced the compactness of the membrane, significantly reducing the surface roughness and thickness of the support layer. Subsequently, a polydopamine (PDA)/Fe 3 + -tannic acid (TA) interlayer was introduced to facilitate the deposition of a defect-free polyamide (PA) selective layer through the interfacial polymerization (IP) process, thereby developing a thin film composite (TFC) FO membrane. The modified PUCS-TFC membrane had water flux (J w ) rates of 35.16 LMH and 44.61 LMH with a 1 M NaCl draw solution (DS) and DI water as feed solution (FS), respectively. At the same time, it had a low reverse salt flux (J s ) of 3.364 gMH and 1.605 gMH under FO and PRO modes, respectively. The J s /J w ratio of 0.095 g/L for 1 M NaCl draw solution indicated efficient performance. The FO membrane also demonstrated an anti-fouling property when tested with humic acid. Therefore, the PUCS-TFC membrane demonstrates great potential for applications in desalination.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2022
·
IF 3.475
Tong Li,Caixia Cheng,Kaifeng Zhang,Jie Yang,Guangshuo Han,Xiuju Wang,Zhongpeng Wang,Liguo Wang
In this paper, the hydrophilic UiO-66-NH2 nanomaterial was synthesized by the solvent-thermal method and characterized. Then, UiO-66-NH2 was introduced into the casting membrane solution of cellulose acetate (CA) forward osmosis (FO) membrane, and CA/UiO-66-NH2 forward osmosis membrane was prepared by the phase inversion method. The optimum preparation conditions of CA/UiO-66-NH2 mixed matrix membranes were determined as follows: the content of UiO-66-NH2 was 0.4 wt%, the coagulation bath temperature was 35°C, the mixing temperature was 50°C and the heat treatment temperature was 50°C. FTIR, SEM, water contact angle and AFM were carried out on CA/UiO-66-NH2 forward osmosis membrane prepared under the best preparation conditions. Compared to the CA forward osmosis membrane, the permeability and selectivity of the CA/UiO-66-NH2 membrane were improved. The water flux and reverse salt flux of the CA/UiO-66-NH2 forward osmosis membrane reached 52.32 L/(m2·h) and 2.43 g/(m2·h), respectively. The permeability selectivity of CA membranes and CA/UiO-66-NH2 membranes did not change much during 180 min, indicating that the two membranes had good long-term stability. This study shows a potential advantage of UiO-66-NH2 as additives for improvement in the desalination performance of forward osmosis membranes.
研究领域:
材料科学
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环境工程
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水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
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2023
·
IF 8.8
Lei Wu,Xiaolu Gong,Cong Ma,Lan Xu,Ming Li,Chen Lyu,Nan Sun
In this study, hydrogels generated by the Schiff base reaction between citral and chitosan (CS) were used for the first time to improve the anti-bacterial property of forward osmosis (FO) membranes. The composite membranes were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR), Water contact angle (WCA), Zeta potential and confocal laser scanning microscopic (CLSM). In the FO filtration experiment, the membrane performance of TFC-1 with 1 M sodium chloride solution as the draw solution and deionized water as the feed solution was the best, with the water flux of 25.54 ± 0.7 L m −2 h −1 and the reverse salt flux of 4.7 ± 0.4 g m −2 h −1 . Although the hydrogel coating produced a certain hydraulic resistance, the flux of the modified membrane was only reduced by about 8%, compared with the unmodified membrane. However, the anti-bacterial property ( Pseudomonas aeruginosa ) and anti-fouling properties (bovine serum protein and lysozyme protein) of the modified membranes were improved, showing good antibacterial properties (99%) and flux recovery rate (over 90%). The modified method has the advantages of easy access to raw materials, simple operation and no risk of secondary pollution, which can effectively reduce the cost of chemical cleaning and extend the service life of the membrane. The modification of membrane by chitosan-based hydrogel is a promising option in the field of membrane anti-bacteria.
研究领域:
材料科学
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膜科学与技术
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生物医学工程
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环境功能材料
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抗菌材料
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Yuzhe Zhou,Yanmei Ma,Xiangyun Li,Wentao Yan,Yong Zhou,Congjie Gao
The co-solvent-assisted interfacial polymerization (CAIP) strategy has proven to be an effective method for fabricating high-performance forward osmosis (FO) membranes. However, current research primarily focuses on the role of co-solvents in conventional interfacial polymerization (IP) technology, with relatively limited studies on unconventional IP technologies. This study explores support-free interfacial polymerization (SFIP) by incorporating dimethyl sulfoxide (DMSO) as a co-solvent. The impact of DMSO on polyamide (PA) structure and membrane performance is systematically investigated throughout the SFIP process. At a DMSO concentration of 1.5 w/v%, SFIP-D1.5 membrane exhibited a high water flux of 29 LMH without a significant increase in reverse salt flux. This phenomenon can be attributed to the dual role of DMSO in promoting monomer diffusion and inducing swelling of the SFIP-PA film. Furthermore, the SFIP-D1.5 membrane exhibited stable performance over 24 h operation and maintained comparable anti-fouling properties during multi-cycle fouling tests. This study reveals the distinct behavior of DMSO in the SFIP process compared to conventional IP, and demonstrates the potential of the CAIP strategy within unconventional IP techniques. This provides a promising approach to enhance both the selectivity and permeability of TFC FO membranes fabricated using strong solvents as co-solvents.
研究领域:
膜科学
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化学工程
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材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Bohao Cheng,Yifan Wang,Xiaowen Wu,Minghao Fang,Xin Min,Zhaohui Huang,Yan'gai Liu,Ruiyu Mi
In this study, the electrospun polyacrylonitrile (ePAN) fiber mats were used as support layer and natural mineral-halloysite nanotubes (HNTs) was used to construct the interlayer. Polydopamine modification was utilized to enhance the hydrophilicity of ePAN substrates and dispersibility of HNTs. The mHNTs interlayer effectively minified the surface pore size of substrates providing a better interface for interfacial polymerization forming an integrated and thin PA selective layers. Compared to the unmodified membranes, the water flux of the optimized membrane with mHNTs interlayer about 61.60% and 79.70% higher and the reverse salt flux of which was 38.95% and 45.08% lower in AL-FS mode and AL-DS mode respectively. These results suggested that introducing halloysite nanotube interlayer is an effective, and low-cost way to fabricate high-performance FO membrane .
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Mingchuan Yu,Hanmin Zhang,Fenglin Yang
In forward osmosis (FO), draw solution is a critical problem which restricts the progress and application of FO technology. The study of an optimal draw solution is essential in the application of the FO technology. In this paper, a mild one-pot method was used to synthesize a ferric-lactate (LAFe) complex, which had a good performance of high osmotic pressure, moderate viscosity and high solubility, as a potential draw solute. Then, the properties of the LAFe complex in FO were systematically studied. The water flux was improved to 18.78 ± 1.56 L m −2 h −1 (LMH) at 1 M LAFe, which was 1.8 times than that of 1 M NaCl. And, the reverse salt flux of the 1 M LAFe (1.00 ± 0.09 g m −2 h −1 ) obviously was diminishing, only 1/4 of the 1 M NaCl. Furthermore, in the application test, 1 M LAFe exhibited the water flux of 7.54 LMH (in the first hour) when the seawater of Huanghai coast was used as the feed solution. The recovery of the LAFe was employed successfully by a nanofiltration method, achieving a high efficiency of 96%.
研究领域:
化学工程
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Yifan Wang,Tingjuan Wang,Xiaowen Wu,Jiancheng Wang,Endong Chang,Zhaohui Huang,Minghao Fang,Xin Min,Shiming Su
Forward osmosis membrane has shown great potential in the fields of seawater desalination and sewage treatment. However, the concentration polarization phenomenon and membrane fouling in the water treatment process greatly reduce the water treatment performance and restrict its application. To address these challenges, we employed a pre-buried seed-in-situ growth method to facilitate the Zn–Al layered double hydroxide (Zn–Al LDH) growth on the thin nanofiber membrane, and use it as the support layer for the preparation of a Zn–Al LDH modified forward osmosis membrane. Studies have shown that the introduction of Zn–Al LDH significantly improves the water treatment efficiency of the forward osmosis membrane (In Al-DS mode, the water flux increased by 87.5 %, up to 50.50 LMH, with a low specific salt flux of 0.13 g L −1 ). It also exhibits exceptional antibacterial, anti-membrane fouling, and photocatalytic degradation properties. This research presents a novel approach for the development of advanced high-efficiency forward osmosis membranes.
研究领域:
水处理
·
膜技术
·
环境工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2022
·
IF 11.211
Hui Wen,Wei Huang,Changkun Liu
In this paper, a novel FO membrane with antibacterial and antifouling properties was prepared for the first time by forming a multifunctional negatively-charged active layer via the surface amidation reaction with two antibacterial agents, namely, sulfamethoxazole (SMX) and trimethoprim (TMP). The membranes modified by SMX and TMP showed superior water flux , the highest reaching 31.86 (±1.2) LMH for M-T-2, and a lower reverse salt flux (7.74 gMH), which significantly improved the FO performance. In addition, the SMX and TMP immobilized on the FO membrane formed an electrostatic repulsive force towards the negatively-charged bacteria, and showed the inherent destruction capabilities for bacteria when in contact, constructing a double barrier for the fouling of bacteria. As an example, M-T-2 membrane showed good anti-bacteria performance (OD value of 0.058) in the actual municipal sludge wastewater, meanwhile maintaining good water permeability (88% of the initial flux). Furthermore, the prepared membrane owned suitable antifouling and antibacterial ability in the negatively-charged dye wastewater, achieving the efficient removal of more than 95.5% of the dyes. These results show that the modification of the active layer with antibacterial agents can significantly improve the application prospect of FO membranes.
研究领域:
环境工程
·
水处理
·
膜科学
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Chaojie Cai,Xiaobin Lei,Xinzhen Zhao,Lin Wang,Jizhen Jia,Changkun Liu
ABSTRACT Modification of the active layer is an effective method to improve the separation performance of the thin-film composite forward osmosis (FO) membranes. In this paper, the dendrimer polyamidoamine (PAMAM) was in-situ integrated into the polyamide (PA) active layer via the interfacial polymerization. The separation performance results showed that the addition of PAMAM significantly improved the separation water flux of the modified FO membrane by 1.7 times, and the reverse salt flux was almost unchanged. In addition, the removal efficiency of the modified FO membrane for heavy metal ions was enhanced, with the rejection rates of various heavy metal ions all higher than 99.6%, and the corresponding water flux was also significantly enhanced. The PAMAM integrated with the active layer contained a large number of hydrophilic segments and terminal amine groups, which in situ enhanced the hydrophilicity and permeability of the active layer, and further improved the removal of heavy metal ions based on the coordination and electrostatic repulsion effects. The purpose of this paper is to provide a feasible way to improve the practical application performance of the FO membranes.
研究领域:
环境工程
·
材料科学
·
水处理技术
✓ 已验证
DOI
高影响因子
DESALINATION
·
2020
·
IF 7.098
Xuan Zhang,Shu Xiong,Chu-Xuan Liu,Liang Shen,Song-Lin Wang,Wan-Zhong Lang,Yan Wang
Substrate modification is advantageous to ameliorate the internal concentration polarization (ICP) phenomenon encountered by most thin-film composite (TFC) membrane in forward osmosis (FO) process, therefore promoting FO implementation to a large extent. Optimization of the intrinsic parameters of substrate (e.g. porosity and tortuosity) can generally be achieved by incorporating hydrophilic or pore-containing materials into the dope solution before the substrate fabrication. In this work, polyvinylidene fluoride (PVDF) substrate with embedded thermal-response poly (N-isopropyl acrylamide) (PNIPAM) microgels is employed for the construction of TFC-FO membrane, where the reversible shrinkage of PNIPAM microgels brings about a lower tortuosity and a higher porosity of the substrate at higher operation temperature, thereby mitigating the ICP impact of the TFC-FO membranes significantly. Effects of PNIPAM content on the properties of the substrates and the resultant polyamide (PA) layer, as well as the corresponding performance of the TFC-FO membranes were comprehensively investigated. The benchmarking shows that, TFC membrane with PNIPAM-modified substrate exhibits remarkably improved water flux of 40.2 L·m −2 ·h −1 and a reduced reverse salt flux of 10.1 g·m −2 ·h −1 , with DI water as feed (50 °C) and 1 M NaCl as draw solution (ambient temperature), which suggests its great potential for treating feed solution with relatively high temperature in the practical applications, for instance, the dyestuff wastewater enrichment.
研究领域:
膜科学
·
环境工程
·
水处理
·
材料科学
✓ 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）