Ionic liquid-assisted bidirectional regulation strategy for carbon quantum dots (CQDs)/Bi4O5I2 nanomaterials and enhanced photocatalytic properties

Mengxia Ji; Jiexiang Xia; Jun Di; Bin Wang; Sheng Yin; Li Xu; Junze Zhao; Huaming Li

doi:10.1016/j.jcis.2016.05.059

Ionic liquid-assisted bidirectional regulation strategy for carbon quantum dots (CQDs)/Bi4O5I2 nanomaterials and enhanced photocatalytic properties

J Colloid Interface Sci. 2016 Sep 15:478:324-33. doi: 10.1016/j.jcis.2016.05.059. Epub 2016 May 30.

Authors

Mengxia Ji¹, Jiexiang Xia², Jun Di¹, Bin Wang¹, Sheng Yin¹, Li Xu¹, Junze Zhao¹, Huaming Li³

Affiliations

¹ School of Chemistry and Chemical Engineering, Institute for Energy Research, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, PR China.
² School of Chemistry and Chemical Engineering, Institute for Energy Research, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, PR China. Electronic address: xjx@ujs.edu.cn.
³ School of Chemistry and Chemical Engineering, Institute for Energy Research, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, PR China. Electronic address: lhm@ujs.edu.cn.

PMID: 27318012
DOI: 10.1016/j.jcis.2016.05.059

Abstract

In this study, novel visible-light-driven carbon quantum dots (CQDs)/Bi4O5I2 material has been prepared via a reactable ionic liquid 1-hexyl-3-methylimidazolium iodide ([Hmim]I) assisted bidirectional regulation solvothermal method. This is the first time for the preparation of CQDs/Bi4O5I2 material with halogen and CQDs bidirectional regulation at the same time. With CQDs modified on the surface of Bi4O5I2, fast transfer of photogenerated charges and low recombination of photo-induced electron-hole pairs facilitated the enhancement of photodegradation activity. At the same time, the introduction of CQDs made the electrons occupied in high-energy potential on the conduction band of Bi4O5I2 transfer to the reaction center CQDs and the molecular oxygen can be thus activated. The enhanced mechanisms for the active species (holes, hydroxyl and superoxide radicals) during the photocatalytic reaction under visible irradiation were analyzed using DRS analysis, electron spin resonance (ESR) technique and free radicals trapping experiments.

Keywords: Bi(4)O(5)I(2); Carbon quantum dots; Ionic liquid; Photocatalytic.