Surface engineering with ionic polymers on membranes for boron removal

IF 4.3 3区工程技术 Q2 ENGINEERING, CHEMICAL

Frontiers of Chemical Science and Engineering Pub Date : 2024-04-17 DOI:10.1007/s11705-024-2413-5

Xiting Zhang, Chenyi Fang, J. Paul Chen, Sui Zhang

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Abstract

Removal of boric acid from seawater and wastewater using reverse osmosis membrane technologies is imperative and yet remains inadequately addressed by current commercial membranes. Existing research efforts performed post-modification of reverse osmosis membranes to enhance boron rejection, which is usually accompanied by substantial sacrifice in water permeability. This study delves into the surface engineering of low-pressure reverse osmosis membranes, aiming to elevate boron removal efficiency while maintaining optimal salt rejection and water permeability. Membranes were modified by the self-polymerization and co-deposition of dopamine and polystyrene sulfonate at varying ratios and concentrations. The surfaces became smoother and more hydrophilic after modification. The optimum membrane exhibited a water permeability of 9.2 ± 0.1 L·m⁻²·h⁻¹·bar⁻¹, NaCl rejection of 95.8% ± 0.3%, and boron rejection of 49.7% ± 0.1% and 99.6% ± 0.3% at neutral and alkaline pH, respectively. The water permeability is reduced by less than 15%, while the boron rejection is 3.7 times higher compared to the blank membrane. This research provides a promising avenue for enhancing boron removal in reverse osmosis membranes and addressing water quality concerns in the desalination process.

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利用离子聚合物对除硼膜进行表面工程处理

利用反渗透膜技术去除海水和废水中的硼酸势在必行，但目前的商用膜仍未充分解决这一问题。现有的研究工作对反渗透膜进行了后改性，以提高硼的去除率，但这通常伴随着透水性的大幅降低。本研究深入探讨了低压反渗透膜的表面工程，旨在提高除硼效率，同时保持最佳的盐排斥和水渗透性。通过多巴胺和聚苯乙烯磺酸盐的自聚合和共沉积，以不同的比例和浓度对膜进行改性。改性后的膜表面更加光滑，亲水性更强。最佳膜的透水性为 9.2 ± 0.1 L-m-2-h-1-bar-1，NaCl 阻隔率为 95.8% ± 0.3%，硼阻隔率在中性和碱性 pH 值下分别为 49.7% ± 0.1% 和 99.6% ± 0.3%。与空白膜相比，水渗透率降低了不到 15%，而硼排斥率则提高了 3.7 倍。这项研究为提高反渗透膜的硼去除率和解决海水淡化过程中的水质问题提供了一条前景广阔的途径。

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来源期刊

Frontiers of Chemical Science and Engineering ENGINEERING, CHEMICAL-

CiteScore

7.60

自引率

6.70%

发文量

868

审稿时长

1 months

期刊介绍： Frontiers of Chemical Science and Engineering presents the latest developments in chemical science and engineering, emphasizing emerging and multidisciplinary fields and international trends in research and development. The journal promotes communication and exchange between scientists all over the world. The contents include original reviews, research papers and short communications. Coverage includes catalysis and reaction engineering, clean energy, functional material, nanotechnology and nanoscience, biomaterials and biotechnology, particle technology and multiphase processing, separation science and technology, sustainable technologies and green processing.