Photocatalytic degradation of rhodamin B and diclofenac sodium on hollow hierarchical microspheres of BiOBr modified with sepiolite and polyvinyl pyrrolidone (PVP)

You Wang, Qiuyue Yang, Xingyan Wang, Jicheng Yang, Youzhi Dai, Yueying He, Wentao Chen, Wen Zhang

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

A novel hollow PVP/AS/BiOBr hierarchical microsphere was successfully fabricated with surface modifications of acidized sepiolite (AS) and polyvinyl pyrrolidone (PVP). The structure, morphology and optical properties of the PVP/AS/BiOBr were systematically characterized. The degradation of rhodamine B (RhB) and diclofenac sodium aqueous solution were studied using this composite photocatalyst to determine the optimal blending rate of AS (6%). The result also indicated that the photocatalytic activity of PVP/AS/BiOBr photocatalysts were superior to that of AS/BiOBr. The enhanced activities of PVP/AS/BiOBr could be attributed to the hollow structure, the improved visible light absorption, the effective separation of photogenerated electron-hole pairs and narrowing band-gap. In addition, the possible photocatalytic degradation pathways of PVP/AS/BiOBr were also analyzed through tracking the degradation by-products. After consecutive degradation experiments, the degradation performance and the catalyst structure both remained unchanged, highlighting the excellent stability and reusability of this novel catalyst.

Original languageEnglish (US)
Pages (from-to)12-22
Number of pages11
JournalMaterials Science and Engineering B: Solid-State Materials for Advanced Technology
Volume244
DOIs
StatePublished - May 2019

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Keywords

  • Acidified sepiolite
  • BiOBr
  • PVP
  • Visible light photocatalysis

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