NEW JOURNAL OF CHEMISTRY
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2019
·Vol. 43
·期 24
·9696-9705
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IF 3.069
Yashi Chen,Qing Li,Xinhong Chen,Xi Xu
Although the construction process of dual functional materials for dye and oil/water separation has been developed rapidly, the postprocess of the used separation materials themselves is still a problem owing to their non-degradation in the natural environment. Herein, novel porous membranes (PLA–PEI) are successfully prepared based on the utilization of a dip-coating technique. The adsorption isotherms and kinetics present a good correlation with Langmuir isotherms and the pseudo-second-order model, respectively. The maximum adsorption capacity of PLA–PEI for methyl orange (MO) can reach 455.10 mg g−1, which is approximately 78 times as much as that of PLA (5.82 mg g−1). In addition, the separation efficiencies of three actual oils (methylbenzene, hexamethylene and soybean oil) are all higher than 99.7%. Moreover, the obtained membranes can realize high-efficiency and simultaneous removal of MO (removal efficiency > 99.8%) and oil droplets (oil rejection > 99.7%) from mixed wastewater under a permeate flux of up to 8285 L m−2 h−1 solely driven by gravity. These results suggest that PLA–PEI is a promising and competitive candidate for water purification.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
·
2025
·
IF 2.3
Chungang Yuan,Zeyu Luo,Chunjiang Liu,Junhou Zhang,Liwei Zheng,Xiaoying Ma,Yujue Wang,Shiwei Guo
Solvent post-treatment is an effective strategy for regulating polyamide nanofiltration membranes. However, the regulatory mechanism behind this process requires further supplementation and improvement. In this study, different polar solvents (polarity order: acetonitrile > methanol > ethanol > acetone > n-butanol > n-hexane) were used for post-treatment of PEI nano-filtration membranes to compare and analyze the influence of solvent post-treatment on the performance of PEI nano-filtration membranes (flux, salt and heavy metal retention). Combined with the comprehensive physicochemical characterization (SEM, FTIR, XPS, contact angle), the regulatory mechanisms of different solvent post-treatments on PEI nanofiltration membranes were analyzed and summarized. The results revealed that the effect of solvent post-treatment on PEI-TMC polyamide is different from that of the MPD and PIP systems, possibly due to the larger molecular weight and acyclic molecular chain structure of PEI. Moreover, the solvent post-treatment mainly modulates the polyamide structure through two mechanisms: the swelling effect and the miscibility-promoted further reaction or hydrolysis. The former is the primary mechanism that determines the changes in separation properties. And the chemical structure of the polyamide surface is primarily influenced by the mutual dissolution promoted reaction or hydrolysis. This study improves the understanding of solvent post-treatment of interfacial polymerization and provides inspiration for performance modulation of positively charged PEI NF membranes.
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
JOURNAL OF POLYMER RESEARCH
·
2025
·Vol. 32
·期 4
·1-18
·
IF 2.8
Liu Ziqun,Yu Yunwu,Yuan Yong,Jiang Bin,Liu Changwei,Wang Junhai,Li Ting,Liu Peng,Ma Ying,Fang Yanfeng,Sun Xiaowei
Based on previous studies, we prepared ultrafiltration membranes by cross-linking PEEKWC/PEI using a non-solvent induced phase separation method, this membrane has excellent hydrophilicity. We also incorporated silica (SiO 2 ) into the cross-linked membrane system through distribution blending in this study. The membranes underwent characterization using various methods including SEM, ATR-FTIR, and water contact angle tests. To assess the impact of silica addition on membrane performance, tests were conducted on pure water flux, dye flux, dye retention, salt solution flux, salt-dye mixed solution flux, and retention. The results indicated a noticeable improvement in the hydrophilicity of the membrane following the addition of silica, as evidenced by a reduction in the hydrophilic angle from 22.175° to 6.271°, pure water flux up to 850 LMH at 0.3 MPa. Moreover, the retention performance of the membrane was enhanced, with the Congo red solution reaching a retention rate of 99.9% at 0.3 MPa pressure. Subsequently, a fixed silica ratio was chosen (2wt%), and different ratios of silane coupling agent were added using the distribution blending method to explore their effects on membrane performance. The tests revealed an improvement in the retention performance, the group with the largest change in the Congo Red cut-off rate, with an increase in the Congo Red cut-off from 88.7% to 97.9%.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2024
·
IF 3.7
Yunwu Yu,Yan Wu,Yong Yuan,Yan Wang,Changwei Xu,Yanfeng Fang,Yaxin Gu,Peng Liu,Ye Wan,Lihua Wang,Xiaowei Sun
Based on the previous study, the properties, separation efficiencies, and anti-fouling performances of TiO 2 nanoparticle embedded PEEKWC/PEI cross-linked ultrafiltration membrane made via non-solvent-induced phase separation were investigated. SEM, contact angle measurement , ATR-FTIR, and other methods were used to characterize the membranes, and then the pure water flux (PWF) and dye rejection were measured. The TiO 2 nanoparticle embedded PEEKWC/PEI cross-linked ultrafiltration membranes were prepared by stepwise solution blending method. Compared to the pristine PEEKWC/PEI cross-linked ultrafiltration membrane, the anti-fouling and pure water flux performances were enhanced as the addition of TiO2 nanoparticles. The pure water flux of TiO 2 nanoparticle embedded membranes was significantly increased and could even reach 3368.2 LMH at 5 bar much greater than that of the pristine PEEKWC/PEI ultrafiltration membrane (1423.8 LMH), remaining a retention rate for BBR higher than 98.5%. And the TiO 2 nanoparticle embedded PEEKWC/PEI cross-linked ultrafiltration membranes exhibited a certain degree of increase of FRR (higher than 80%) after UV illumination. After a series of characterisation, the dye wastewater treatment property of membranes was assessed through filtration of Coomassie brilliant blue and Congo red solutions and researches were conducted on the anti-fouling capabilities of membranes. The TiO 2 nanoparticle embedded PEEKWC/PEI cross-linked ultrafiltration membranes exhibited self-cleaning efficiency with lower irreversible fouling ratio. The pure water flux recovery ratio following dye fouling was higher after being exposed to UV irradiation, which could be attributed to the TiO 2 nanoparticles' photocatalytic destruction of organic pollutants .
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
危险品化学品经营许可证（带存储）