A novel hollow-sphere cyclodextrin nanoreactor for the enhanced removal of bisphenol A under visible irradiation

Yi Zhou; Jian Lu; Qiming Liu; Huafeng Chen; Yongdi Liu; Yanbo Zhou

doi:10.1016/j.jhazmat.2019.121267

A novel hollow-sphere cyclodextrin nanoreactor for the enhanced removal of bisphenol A under visible irradiation

J Hazard Mater. 2020 Feb 15:384:121267. doi: 10.1016/j.jhazmat.2019.121267. Epub 2019 Sep 20.

Authors

Yi Zhou¹, Jian Lu², Qiming Liu², Huafeng Chen², Yongdi Liu², Yanbo Zhou³

Affiliations

¹ State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, No. 130 Meilong Road, Shanghai 200237, China; Shanghai Institute of Pollution Control and Ecological Security, No. 1515 Zhongshan Second North Road, Shanghai 200092, China.
² State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, No. 130 Meilong Road, Shanghai 200237, China.
³ State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, No. 130 Meilong Road, Shanghai 200237, China; Shanghai Institute of Pollution Control and Ecological Security, No. 1515 Zhongshan Second North Road, Shanghai 200092, China. Electronic address: zhouyanbo@ecust.edu.cn.

PMID: 31574385
DOI: 10.1016/j.jhazmat.2019.121267

Abstract

A novel hybrid nanoreactor with spatially separated co-catalysts (SH-CD-Au@CdS@MnO_x) was successfully synthesised to remove bisphenol-A (BPA) from water by visible light. The photooxidation intermediates, degradation pathway of BPA and the enhancement mechanism were investigated in particular. Gold (Au) nanoparticles modified with SH-β-cyclodextrin and MnO_x nanoparticles were selectively decorated on the interior and exterior surface of hollow CdS nanoreactors, respectively. The directed migration of photogenerated electrons and holes induced by spatially separated co-catalysts lead to high utilization of light, and SH-β-cyclodextrin modification makes catalytic active sites more accessible for oxidation intermediates. Compared with pristine CdS, the hybrid nanoreactor increased the BPA photooxidation reaction rate and the TOC removal efficiency by 5.6-fold and 3.6-fold, respectively. Moreover, the toxic intermediates, such as phenol, were further degraded by visible light. Molecular orbital calculation predicted that the sites on BPA molecule values of (FED²_HOMO + FED²_LUMO) can be easier attacked by the radical, whereas atoms with higher values of 2FED²_HOMO can easily be extracted into electrons. Thus, SH-CD-Au@CdS@MnO_x can provide a new strategy for the high-efficiency photodegradation of endocrine disrupter compounds in advanced water treatments.

Keywords: Advanced treatment; Biphenol A; Cyclodextrin; Photocatalysis; Spatially separated co-catalyst.

Publication types

Research Support, Non-U.S. Gov't