Photocatalytic Bi2WO6/pg-C3N4-embedded in polyamide microfiltration membrane with enhanced performance in synergistic adsorption-photocatalysis of 17β-estradiol from water
Photocatalytic Bi2WO6/pg-C3N4-embedded in polyamide microfiltration membrane with enhanced performance in synergistic adsorption-photocatalysis of 17β-estradiol from water
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DOI：
10.1016/j.jece.2022.108648
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发表时间：
2022-12
影响因子：
7.7
通讯作者：
Yashi Qing;Yanxiang Li;Zhiwei Guo;Yujie Yang;Wangliang Li
中科院分区：
文献类型：
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作者：
Yashi Qing;Yanxiang Li;Zhiwei Guo;Yujie Yang;Wangliang Li
17β-雌二醇（E2）是一种普遍存在的内分泌干扰物质，即使在极低浓度下也会对生态系统和生物产生重大影响。光催化膜是光催化与膜过滤相结合的产物，具有增强去除E2的潜力。本研究以聚酰胺（PA）微滤膜和Bi2WO6/质子化g-C3N4（BPG）光催化剂为催化剂，制备了光催化膜。将BPG光催化剂包埋在海藻酸钙水凝胶中，通过真空过滤和交联将其固定在PA膜上。透明海藻酸钙水凝胶保证100%的透光率，有助于可见光诱导的光降解。在静态和动态条件下，对E2的去除率达到99.5%，保持在95.1%，这主要是由于BPG纳米复合材料对PA的吸附和光降解的协同作用。通过修正的Elovich模型拟合了协同作用，Pearson’s和Spearman’s相关系数证实了二者之间存在较强的正相关关系（r = 0.834, rs= 0.965），说明吸附可以通过将污染物集中于光催化剂周围来增强光催化作用，而光催化可以通过再生吸附位点来促进吸附。光催化膜可重复使用，5次循环后对E2的去除率为96.6%。这项工作不仅为光催化膜的制备提供了方便，而且对有效去除E2的协同吸附-光催化有了深入的了解。
17β-estradiol (E2) is one of the endocrine disrupting chemicals (EDCs) ubiquitously with significant impacts on ecosystem and organisms even at extremely low concentrations. Photocatalytic membranes, with the combination of photocatalysis and membrane filtration, have great potential to enhance E2 removal. In this work, a photocatalytic membrane was fabricated from the polyamide (PA) microfiltration membrane and visible light responsive Bi2WO6/protonated g-C3N4(BPG) photocatalyst. The BPG photocatalyst was embedded into calcium alginate hydrogel followed by immobilizing onto PA membrane through vacuum filtration and crosslinking. The transparent calcium alginate hydrogel guaranteed 100% light transmittance which contributed to visible light induced photodegradation. Under static and dynamic conditions, the removal efficiency of E2 reached 99.5% and remained 95.1%, which was mainly owing to the synergistic effects of the adsorption of PA and photodegradation of the BPG nanocomposites. The synergistic interaction was fitted by modified Elovich model, and a strong positive correlation (r = 0.834, rs= 0.965) was confirmed by Pearson’s and Spearman’s correlation coefficient, indicating that adsorption could enhance photocatalysis by concentrating contaminants around the photocatalyst and photocatalysis could promote the adsorption by regenerating adsorption sites. The photocatalytic membrane can be reused, and the removal efficiency of E2 was 96.6% after 5 cycles. This work provided not only a facile fabrication of photocatalytic membrane, but also a deep understanding of the synergistic adsorption-photocatalysis for effective removal of E2.