Flower-like silver bismuthate supported on nitrogen-doped carbon dots modified graphene oxide sheets with excellent degradation activity for organic pollutants

Xiaoyang Yue; Xuli Miao; Xiaoping Shen; Zhenyuan Ji; Hu Zhou; Yiming Sun; Keqiang Xu; Guoxing Zhu; Lirong Kong; Quanrun Chen; Na Li; Xiaomei He

doi:10.1016/j.jcis.2019.01.026

Flower-like silver bismuthate supported on nitrogen-doped carbon dots modified graphene oxide sheets with excellent degradation activity for organic pollutants

J Colloid Interface Sci. 2019 Mar 22:540:167-176. doi: 10.1016/j.jcis.2019.01.026. Epub 2019 Jan 8.

Authors

Xiaoyang Yue¹, Xuli Miao¹, Xiaoping Shen², Zhenyuan Ji¹, Hu Zhou³, Yiming Sun¹, Keqiang Xu¹, Guoxing Zhu¹, Lirong Kong¹, Quanrun Chen¹, Na Li¹, Xiaomei He¹

Affiliations

¹ School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, People's Republic of China.
² School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, People's Republic of China. Electronic address: xiaopingshen@163.com.
³ School of Material Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, People's Republic of China.

PMID: 30639664
DOI: 10.1016/j.jcis.2019.01.026

Abstract

In this study, a new ternary AgBiO₃/GO/NCDs composite (GO = graphene oxide, NCDs = nitrogen-doped carbon dots) has been successfully prepared through in-situ growth of flower-like AgBiO₃ on GO/NCDs complex support. The AgBiO₃/GO/NCDs composite exhibits significantly enhanced degradation activities towards organic pollutants of rhodamine B, phenol and tetracycline. Especially, the refractory tetracycline (20 mg L^-1) can be completely removed within 6.0 min with a dosage of 30 mg of AgBiO₃/GO/NCDs under the assistance of peroxymonosulfate (PMS, 0.2 mM). It is revealed that GO in the composite can facilitate the quick and efficient electron transfer and improve the generation of reactive oxygen species during the degradation process, while the NCDs may play double roles as both the electron-acceptor and the reactive site. Besides, the electrons can be captured by PMS to produce plenty of sulfate radicals (SO₄^-) with very strong oxidation ability. All these factors collaboratively promote the degradation efficiency of AgBiO₃/GO/NCDs towards organic pollutants. The excellent degradation activities of AgBiO₃/GO/NCDs endow it with potential application in wastewater purification.

Keywords: AgBiO(3); Carbon dots; Degradation; Graphene oxide; Organic pollutants.