Fouling-resistant reverse osmosis membranes grafted with 2-aminoethanethiol having a low interaction energy with charged foulants

IF 10.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

npj Clean Water Pub Date : 2024-04-18 DOI:10.1038/s41545-024-00326-5

Jun Xiao, Shuang Hao, Yiwen Qin, Pengfei Qi, Zhaoqian Zhang, Yunxia Hu

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Abstract

Many fouling-resistant materials have been grafted or coated on the RO membrane surface for fouling-resistance. However, these modified RO membranes still exhibit a fast flux drop towards small charged organic foulants. Herein, we creatively use the quantum chemistry method to screen the thiol group having a close to zero interaction energy with small charged organic foulants. Thus, we selected a small molecule of 2-aminoethanethiol (AET) having a fouling-resistant thiol group and a reactive amine group for RO membrane surface modification. The water permeance of the AET-grafted RO membrane increases from 2.6 ± 0.1 L m−2 h−1 bar−1 to 3.2 ± 0.05 L m−2 h−1 bar−1, 23% higher than that of the pristine membrane. Moreover, the AET-grafted RO membrane exhibits excellent fouling resistance against charged surfactants. Our study offers insights on the design of fouling-resistant molecules for antifouling surface modification of RO membranes towards small charged organic foulants.

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与带电污物相互作用能低的 2-氨基乙硫醇接枝的抗污反渗透膜

许多抗污垢材料被接枝或涂覆在反渗透膜表面，以达到抗污垢的目的。然而，这些改性反渗透膜对小电荷有机污物仍会表现出快速的通量下降。在此，我们创造性地利用量子化学方法筛选出与带小电荷的有机污物相互作用能接近于零的硫醇基团。因此，我们选择了一种具有抗污垢硫醇基团和活性胺基团的小分子 2-氨基乙硫醇（AET）用于反渗透膜表面改性。AET 接枝反渗透膜的透水率从 2.6 ± 0.1 L m-2 h-1 bar-1 提高到 3.2 ± 0.05 L m-2 h-1 bar-1，比原始膜高出 23%。此外，AET 接枝的反渗透膜对带电表面活性剂具有极佳的防污性能。我们的研究为设计反渗透膜表面防污改性的抗污分子提供了启示，使反渗透膜能够抵御小的带电有机污物。

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来源期刊

npj Clean Water Environmental Science-Water Science and Technology

CiteScore

15.30

自引率

2.60%

发文量

审稿时长

5 weeks

期刊介绍： npj Clean Water publishes high-quality papers that report cutting-edge science, technology, applications, policies, and societal issues contributing to a more sustainable supply of clean water. The journal's publications may also support and accelerate the achievement of Sustainable Development Goal 6, which focuses on clean water and sanitation.