用于去除水中 Cu(II) 的羧甲基 PVA/PVDF 超滤膜

IF 4.1 2区 化学 Q2 POLYMER SCIENCE
Yanwen Chen , Jianguo Xu , Miao Miao , Xueqin Shi , Nana Li
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引用次数: 0

摘要

超滤膜具有筛分大分子的作用,但无法去除水中的重金属离子,而且容易被大分子污染。为了实现聚偏二氟乙烯(PVDF)超滤膜的多功能性和防污性,我们采用化学接枝法合成了羧甲基聚乙烯醇(CPVA)。随后,我们将 CPVA 与 PVDF 膜混合,采用非溶剂共诱导相分离(NIPS)方法制备了羧甲基聚乙烯醇改性 PVDF(CPVA/PVDF)超滤膜,该膜在抗污的同时还具有显著的铜(II)吸收能力。通过观察筛网吸附过程,我们观察到渗透通量大幅提高,从纯 PVDF 膜的 1.21 L-m-2-h-1 提高到 CPVA/PVDF 膜的 53.37 L-m-2-h-1。超滤膜的静态吸附符合 Langmuir 和 Freundlich 等温模型,并遵循伪二阶动力学模型。此外,混合膜能同时有效去除牛血清白蛋白(BSA)和铜(II),BSA 的去除率达到 92.00%,铜(II)的去除率达到 90.89%。经过 10 次循环筛分和吸附后,BSA 的去除率始终保持在 91.00% 以上,而最初的 Cu(II) 去除率则超过了 81.00%,显示了极佳的重现性。除了过滤 BSA 外,混合膜还表现出较低的不可逆污垢率(2.59%)和较高的污垢回收率(97.41%),突出了其强大的防污性能。所开发的筛网吸附超滤膜为有效处理复杂的废水流奠定了坚实的基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Carboxymethylated PVA/PVDF ultrafiltration membrane for removing Cu(II) from water

Carboxymethylated PVA/PVDF ultrafiltration membrane for removing Cu(II) from water

Carboxymethylated PVA/PVDF ultrafiltration membrane for removing Cu(II) from water
The ultrafiltration membrane serves to sieve macromolecules but is unable to eliminate heavy metal ions in water, and is prone to be polluted by macromolecules. To achieve the multifunctional and anti-fouling of polyvinylidene fluoride (PVDF) ultrafiltration membrane, we employed the chemical grafting method to synthesize carboxymethyl polyvinyl alcohol (CPVA). Subsequently, we blended CPVA with the PVDF membrane, employing the non-solvent co-induced phase separation (NIPS) method to fabricate the carboxymethylated PVA modified PVDF (CPVA/PVDF) ultrafiltration membrane, which demonstrated significant Cu(II) absorbance capability alongside anti-fouling properties. By observing the sieve-adsorption process, we observed a substantial enhancement in permeate flux, increasing from 1.21 L m−2 h−1 for the pure PVDF membrane to 53.37 L m−2 h−1 for the CPVA/PVDF membrane. The static adsorption of the ultrafiltration membrane satisfied the Langmuir and Freundlich isothermal models and followed pseudo-second-order kinetic model. Moreover, the blended membrane effectively removed Bovine Serum Albumin (BSA) and Cu(II) simultaneously, achieving BSA rejection efficiency of 92.00 % and Cu(II) removal rate of 90.89 %. After 10 cycles of sieving and adsorption, the BSA rejection efficiency remained consistently above 91.00 %, while the initial Cu(II) removal rate exceeded 81.00 %, indicating excellent reproducibility. In addition to the filtration of BSA, the blended membrane exhibited a low irreversible fouling of 2.59 % and a high fouling recovery rate of 97.41 %, underscoring its robust anti-fouling properties. The developed sieve-adsorption ultrafiltration membrane lays a solid foundation for the effective treatment of complex wastewater streams.
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来源期刊
Polymer
Polymer 化学-高分子科学
CiteScore
7.90
自引率
8.70%
发文量
959
审稿时长
32 days
期刊介绍: Polymer is an interdisciplinary journal dedicated to publishing innovative and significant advances in Polymer Physics, Chemistry and Technology. We welcome submissions on polymer hybrids, nanocomposites, characterisation and self-assembly. Polymer also publishes work on the technological application of polymers in energy and optoelectronics. The main scope is covered but not limited to the following core areas: Polymer Materials Nanocomposites and hybrid nanomaterials Polymer blends, films, fibres, networks and porous materials Physical Characterization Characterisation, modelling and simulation* of molecular and materials properties in bulk, solution, and thin films Polymer Engineering Advanced multiscale processing methods Polymer Synthesis, Modification and Self-assembly Including designer polymer architectures, mechanisms and kinetics, and supramolecular polymerization Technological Applications Polymers for energy generation and storage Polymer membranes for separation technology Polymers for opto- and microelectronics.
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