Self-cleaning membranes for water purification by co-deposition of photo-mobile 4,4′-azodianiline and bio-adhesive polydopamine
Self-cleaning membranes for water purification by co-deposition of photo-mobile 4,4′-azodianiline and bio-adhesive polydopamine
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DOI：
10.1016/j.memsci.2018.02.068
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发表时间：
2018-05
影响因子：
9.5
通讯作者：
Sankara N. Ramanan;Nima Shahkaramipour;Thien N. Tran;Lingxiang Zhu;Surendar R. Venna;Chang‐Keun Lim;Ajay-Vikram Singh;P. Prasad;Haiqing Lin
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作者：
Sankara N. Ramanan;Nima Shahkaramipour;Thien N. Tran;Lingxiang Zhu;Surendar R. Venna;Chang‐Keun Lim;Ajay-Vikram Singh;P. Prasad;Haiqing Lin
刺激响应型膜已被广泛研究，以减轻膜表面的污染，以实现稳定的水净化性能。在此，开发了一种在膜表面上的光移动材料的简易一步涂覆，以赋予在紫外线（UV）和可见光交替暴露时的自清洁性能。具体而言，光移动的4，4 ′-偶氮二苯胺（AZO）和生物粘附性聚多巴胺（PDA）的超滤（UF）膜表面共沉积。系统地评价了涂层对表面亲水性和纯水渗透性的影响。利用紫外-可见吸收光谱研究了AZO的光响应特性。当暴露于紫外光下时，AZO经历从trans-AZO到cis-AZO的光异构化，减小体积，而暴露于可见光下则使顺式构型转变为trans-AZO，增加体积。在处理1g/L牛血清白蛋白（BSA）溶液时，通过可逆体积变化证实了改性膜的自清洁行为。在暴露于交替的UV/维斯光后，AZO涂覆的UF膜显示出约160%的水渗透性增加。
Stimuli-responsive membranes have been widely explored to mitigate fouling on the membrane surface to achieve the stable performance of water purification. Herein, a facile one-step coating of photo-mobile materials on membrane surface was developed to impart self-cleaning property upon exposure alternatively to ultraviolet (UV) and visible light. Specifically, photo-mobile 4,4′-azodianiline (AZO) and a bio-adhesive polydopamine (PDA) were co-deposited on the surface of ultrafiltration (UF) membranes. The effect of the coating layer on the surface hydrophilicity and pure water permeance was systematically evaluated. The photoresponsive properties of AZO in solutions and thin films with PDA was characterized using UV–Vis absorption spectroscopy. When exposed with UV light, AZO undergoes photoisomerization fromtrans-AZO tocis-AZO, decreasing the volume, while the exposure to visible light enables the transition from thecis- totrans-configuration, increasing the volume. The resulted self-cleaning behavior of the modified membranes through the reversible volume change is demonstrated in treating 1 g/L bovine serum albumin (BSA) solution. After exposure to the alternative UV/vis light, the AZO-coated UF membranes showed an increased water permeance by ~160%.