Frontiers of Environmental Science & Engineering
·
2022
·Vol. 16
·期 9
·1-12
·
IF 6.048
Ma Tao,Hui Haiqing,You Xiaofei,Pei Zhiqiang,Tian Miao,Wu Bing
Nanofibre-supported forward osmosis (FO) membranes have gained popularity owing to their low structural parameters and high water flux. However, the nanofibrous membranes are less stable in long-term use, and their fouling behaviours with foulants in both feed solution (FS) and draw solution (DS) is less studied. This study developed a nanofibrous thin-film composite (TFC) FO membrane by designing a tiered dual-layer nanofibrous substrate to enhance membrane stability during long-term usage and cleaning. Various characterisation methods were used to study the effect of the electrospun nanofibre interlayer and drying time, which is the interval after removing the M-phenylenediamine (MPD) solution and before reacting with trimesoyl chloride (TMC) solution, on the intrinsic separation FO performance. The separation performance of the dual-layer nanofibrous FO membranes was examined using model foulants (sodium alginate and bovine serum albumin) in both the FS and DS. The dual-layer nanofibrous substrate was superior to the single-layer nanofibrous substrate and showed a flux of 30.2 L/m 2 /h (LMH) when using 1.5 mol/L NaCl against deionised (DI) water in the active layer facing draw solution (AL-DS) mode. In the fouling test, the water flux was effectively improved without sacrificing the water/solute selectivity under the condition that foulants existed in both the FS and DS. In addition, the dual-layer nanofibrous TFC FO membrane was more robust during the fouling test and cleaning.
研究领域:
材料科学
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环境工程
·
水处理技术
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Chunru Sun,Min Xiao,Jianghao Tian,Huixian Zhang
A polysulfone/metal–organic framework (MOF) based photocatalytic nanofiltration membrane is proposed in this study. Interfacial polymerization (IP) is the universal method of preparing nanofiltration (NF) membranes. In this work, the (TFN) membranes were synthesized with an in-situ interfacial synthetic method to incorporate BiOCl/MIL-101(Fe)@PDA(BMP) into the polyamide (PA) selective layer. Five distinct BMP loadings (0, 0.05, 0.1, 0.15, and 0.2 wt%) were established to examine the impact of additional BMP on the physicochemical characteristics of the produced TFN membranes. Under the irradiation of a xenon lamp with a power of 300 W, the water flux of M3 at a pressure of 0.6 MPa was 277.14 L m -2 h -1 . Furthermore, the BSA-based antifouling tests demonstrated the membrane’s outstanding antifouling capabilities, with a flux recovery rate reaching 94.08 %. The optimal membrane maintained a high and stable retention of tetracycline for 12 h. The interfacial synthesis of MOF/PA offers a new approach to the fabrication of photocatalytic NF membranes.
研究领域:
材料科学
·
环境工程
·
化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2017
·
IF 6.035
Zhu Xiong,Yun Zhong,Haibo Lin,Fu Liu,Tiantian Li,Jinglong Li
In this work, a feasible and efficient approach was developed to produce Poly(lactic acid (PLA) ultrafiltration membrane with both high permeability and high rejection simultaneously. Poly(L-lactic acid)/Poly(D-lactic acid) (PDLA/PLLA) stereocomplex crystallites were thought to play the critical role different from the traditional pore forming agents or hydrophilic modification. The membrane morphology of the stereocomplex PDLA/PLLA membrane with high porosity and thin skin layer was observed by SEM. The addition of PDLA resulted in the thermodynamic enhancement for phase separation of PLLA casting solution as demonstrated by a rotational rheometer. The PDLA/PLLA stereocomplex crystallization behavior was investigated by DSC and XRD . With increasing the stereocomplex crystallites, the water permeability of PLA membrane significantly increased from ~482 L/m 2 ·h to ~3325 L/m 2 h, while with small loss in degree of rejection. Furthermore, the stereocomplex PLA membrane demonstrated the excellent separation efficiency for nano-TiO 2 and ink dispersion. Besides, the stereocomplex PLA membrane exhibited outstanding anti-protein fouling properties through the static and dynamic BSA antifouling tests. All results demonstrated that the stereocomplexation can effectively tune the pore size evolution and control the permeability, selectivity and fouling resistance.
研究领域:
材料科学
·
膜技术
·
高分子化学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Qiang Xue,Kaisong Zhang
Current membranes have limitations in permeability and selectivity, and require long-time stability, which drive the development of high-performance nanofiltration (NF) membranes. MXene is a new type of highly hydrophilic and negatively charged two-dimensional (2D) nanosheets material, especially its supernatant has good dispersibility and stability. The MXene supernatant containing several layers was treated as aqueous solvent for interfacial polymerization, consequently the prepared MXene nanocomposite membrane could maintain high permeselectivity even under low pressures required for low carbon. The characterization results showed that the MXene nanocomposite membrane had better hydrophilicity and higher negative charge. At the same time, the Na 2 SO 4 rejection was increased to 97.6% and the pure water flux was improved by about 1.7 times compared with the pristine membrane. In the BSA antifouling test and 58-day persistent desalination test, the MXene nanocomposite membrane showed the better antifouling property, high rejection and good stability. As an excellent 2D modifier, MXene provided fresh ideas and guidance for low-carbon and persistent NF membranes with excellent separation performance.
研究领域:
材料科学
·
环境工程
·
纳米技术
·
水处理
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Zi-Kang Tan,Ji-Lai Gong,Si-Yuan Fang,Juan Li,Wei-Cheng Cao,Zeng-Ping Chen
Biofouling was a considerable issue in the water treatment by membrane technology. In this study, high anti-bacterial property Ag-MOF was synthesized followed by embedding into polyamide layer with vacuum-assisted interfacial polymerization process to prepare an Ag-MOF incorporated membrane. The successful preparation of Ag-MOF and membranes was verified by FT-IR, FESEM, XPS, XRD, BET, zeta potential and contact angle test. On account to the strong hydrophility, porous structure, electronegativity and antibacterial property of Ag-MOF, modified membranes showed excellent performance for dyes, salts and bacteria. The water permeability of modified membranes was increased from 9.2 to 14.3 L m -2 h −1 bar −1 and the rejection rate of MO, MB and RB of the optimum membranes were 95.4%, 87.8% and 99.3%, respectively. The rejection rate of Na 2 SO 4 and MgSO 4 were increased from 54.0% and 36.6% to 84.1% and 73.1%. The sterilization rate of modified membranes to E. coli and S. aureus both exceeded 99%. The leaching test of Ag + evaluated the potential mechanism of anti-bacterial property. Moreover, dynamic bio-fouling test were used to detect the actual status in the filtration process. Those results suggested that modified membranes showed a strong resistance to bio-foulants thus enlarged the scope of application of membranes for water treatment.
研究领域:
材料科学
·
环境工程
·
化学工程
·
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）