文献类型：期刊文献

英文题名：Accelerated photoelectron transmission by carboxymethyl β-cyclodextrin for organic contaminants removal: An alternative to noble metal catalyst

作者：Zhou, Yi[1,2];Liu, Qiming[1];Lu, Jian[1];He, Jie[1];Liu, Yongdi[1];Zhou, Yanbo[1,2]

机构：[1]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Shanghai Inst Pollut Control & Ecol Secur, 1515 Zhongshan Second North Rd, Shanghai 200092, Peoples R China

年份：2020

卷号：393

外文期刊名：JOURNAL OF HAZARDOUS MATERIALS

收录：;EI(收录号：20201008257966);WOS:【SCI-EXPANDED(收录号:WOS:000532829200073)】；

基金：This work was supported by the National Natural Science Foundation of China (51778230, 21906056), Shanghai Rising-Star Program (17QA1401000), China Postdoctoral Science Foundation (2018M641943) and Shanghai Sailing Program (19YF1411900).

语种：英文

外文关键词：Bisphenol A; Sulfanilamide; Photocatalysis; Cyclodextrin; TiO2

摘要：Applications of noble metal decorated photocatalytic nanomaterials are restricted by its high cost. In this study, carboxymethyl beta-cyclodextrin (CM-beta-CD), as an alternative to gold nanoparticle, was used to modified titanium dioxide (CM-beta-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-beta-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-beta-CD-P25(2:1) under 1 h UV light irradiation. The photooxidation rate constant of BPA, phenol and SA by CM-beta-CD-P25(2:1) were 0.039 min(-1), 0.021 min(-1) and 0.062 min(-1), respectively, which are much higher than that of pristine P25 and Au-P25. Moreover, the photocatalytic activity of CM-beta-CD-P25(2:1) remains almost unchanged in repeated cycle test owing to its high stability. The reasonable mechanism of CM-beta-CD-P25 were investigated. CM-beta-CD-P25 hybrid nanoparticles completely surpasses Au-P25 in organic contaminants removal, and shows great potential to replace noble metal as mediator.