Accelerated photoelectron transmission by carboxymethyl β-cyclodextrin for organic contaminants removal: An alternative to noble metal catalyst.
Accelerated photoelectron transmission by carboxymethyl β-cyclodextrin for organic contaminants removal: An alternative to noble metal catalyst.
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DOI：
10.1016/j.jhazmat.2020.122414
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发表时间：
2020-02
影响因子：
13.6
通讯作者：
Yi Zhou;Qiming Liu;J. Lu;Jie He;Yongdi Liu;Yanbo Zhou
中科院分区：
文献类型：
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作者：
Yi Zhou;Qiming Liu;J. Lu;Jie He;Yongdi Liu;Yanbo Zhou
贵金属修饰的光催化纳米材料的应用因其高成本而受到限制。在本研究中，羧甲基β-环糊精（CM-β-CD）作为金纳米粒子的替代品，被用来修饰二氧化钛（CM-β-CD-P25），以加速光电子传输并增强对水中有机污染物的去除。一些新兴的有机污染物，如双酚 A (BPA)、苯酚和磺胺 (SA)，被用来评估其光催化活性。羧甲基-β-环糊精不仅提供疏水位点来捕获有机污染物，而且还提供了加速光生电荷传输而不引入复合界面的“桥梁”。因此，在1小时的紫外光照射下，CM-β-CD-P25(2:1)可以去除91.6%的BPA、71.9%的苯酚和97.1%的SA。 CM-β-CD-P25(2:1)对BPA、苯酚和SA的光氧化速率常数分别为0.039 min−1、0.021 min−1和0.062 min−1，远高于原始P25和Au-P25。此外，由于其高稳定性，CM-β-CD-P25(2:1)的光催化活性在重复循环测试中几乎保持不变。研究了CM-β-CD-P25的合理作用机制。 CM-β-CD-P25杂化纳米颗粒在有机污染物去除方面完全超越Au-P25，并显示出替代贵金属作为介体的巨大潜力。
Applications of noble metal decorated photocatalytic nanomaterials are restricted by its high cost. In this study, carboxymethyl β-cyclodextrin (CM-β-CD), as an alternative to gold nanoparticle, was used to modified titanium dioxide (CM-β-CD-P25) to accelerate photoelectron transmission and enhance the organic contaminants removal from water. Several of emerging organic contaminants, such as bisphenol A (BPA), phenol and sulphanilamide (SA), were used to evaluate their photocatalytic activities. Carboxymethyl-β-cyclodextrin not only provide hydrophobic sites to entrap organic contaminants but also provide a “bridge” for accelerated transmission of photogenerated charges without introducing the recombination interface. Consequently, 91.6 % of BPA, 71.9 % of phenol and 97.1 % of SA could be removed by CM-β-CD-P25(2:1) under 1 h UV light irradiation. The photooxidation rate constant of BPA, phenol and SA by CM-β-CD-P25(2:1) were 0.039 min−1, 0.021 min−1and 0.062 min−1, respectively, which are much higher than that of pristine P25 and Au-P25. Moreover, the photocatalytic activity of CM-β-CD-P25(2:1) remains almost unchanged in repeated cycle test owing to its high stability. The reasonable mechanism of CM-β-CD-P25 were investigated. CM-β-CD-P25 hybrid nanoparticles completely surpasses Au-P25 in organic contaminants removal, and shows great potential to replace noble metal as mediator.