Fabrication of a SnO2-Sb nano-pin array anode for efficient electrocatalytic oxidation of bisphenol A in wastewater

Chao Yang; Xiao-Yan Li; Lin Lin

doi:10.1016/j.jhazmat.2022.130444

Fabrication of a SnO₂-Sb nano-pin array anode for efficient electrocatalytic oxidation of bisphenol A in wastewater

J Hazard Mater. 2023 Feb 15;444(Pt B):130444. doi: 10.1016/j.jhazmat.2022.130444. Epub 2022 Nov 19.

Authors

Chao Yang¹, Xiao-Yan Li², Lin Lin³

Affiliations

¹ Department of Civil Engineering, The University of Hong Kong, Pokfulam, Hong Kong, China.
² Department of Civil Engineering, The University of Hong Kong, Pokfulam, Hong Kong, China; Institute of Environment and Ecology, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China. Electronic address: xlia@hku.hk.
³ Institute of Environment and Ecology, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China. Electronic address: linlin00@sz.tsinghua.edu.cn.

PMID: 36435040
DOI: 10.1016/j.jhazmat.2022.130444

Abstract

Electrocatalytic oxidation is a promising technology for eliminating bio-recalcitrant organic pollutants; however, the low efficiency and poor durability of the anodes hinder its practical application. Herein, a SnO₂-Sb nano-pin array (NPA) was fabricated on a RuO₂-based dimensionally stable anode (DSA) via a new hydrothermal-electrodeposition route to prepare a novel anode (SnO₂-Sb NPA). Compared with the conventional SnO₂-Sb/DSA and SnO₂-Sb/Ti anodes, the new SnO₂-Sb NPA anode possessed twice the electroactive surface area and a higher electron transfer efficiency for electrocatalytic reactions. The SnO₂-Sb NPA anode exhibited more than twice the rate constant of bisphenol A (BPA) degradation (0.026 min^-1) and a 120 times prolonged service life in comparison to the conventional SnO₂-Sb/Ti anode. Moreover, the SnO₂-Sb NPA anode performed well in removing BPA from actual wastewater. The mechanism of electrocatalytic degradation involves direct oxidation via electron transfer through the nano-pin surface and oxidation by in situ generated •OH radicals.

Keywords: Electrocatalytic oxidation; Emerging contaminants; Nano-pin arrays; SnO(2)-Sb anode; Wastewater treatment.

Publication types

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

MeSH terms

Benzhydryl Compounds*
Electrodes
Phenols
Wastewater*

Substances

bisphenol A
Waste Water
Benzhydryl Compounds
Phenols