Electrooxidation degradation of hydroxychloroquine in wastewater using a long-acting Ti-based PbO < sub > 2 < /sub > anode with an arc-sprayed (Ti,Zr)N interlayer

Chemosphere. 2023 May 30:139074. doi: 10.1016/j.chemosphere.2023.139074. Online ahead of print.ABSTRACTTo solve the challenges facing the low-cost and high-efficiency purification of water pollution caused by the production and metabolism of biodegradable hydroxychloroquine (HCQ), electrooxidation treatment with a Ti-based PbO2 anode is the most promising technical solution for engineering applications. However, Ti-based PbO2 anodes have apparent disadvantages, such as poor stability and insufficient electrocatalytic activity. To overcome these shortcomings, a novel Ti/(Ti,Zr)N/PbO2 anode was prepared by introducing an arc-sprayed (Ti,Zr)N conductive composite interlayer together with a PbO2 surface layer anodically deposited at different times on a Ti substrate. The electrocatalytic activity, anode stability, optimized parameters and degradation mechanism of the HCQ electrooxidation treatment were experimentally studied. As a result, compared to the Ti/PbO2 anode without an interlayer, the Ti/(Ti,Zr)N/PbO2 anode not only showed obviously excellent stability but could also effectively electrocatalytically degrade HCQ. The optimal Ti/(Ti,Zr)N/PbO2-2.0 anode prepared using the arc-sprayed (Ti,Zr)N interlayer and electrodepositing PbO2 for 2 h can remove 95.85% of 200 mg L-1 HCQ at 20 °C and pH 7 after electrolysis at 20 mA cm-2 for 3 h, and possesses a longer accelerated life with 11.8 times the lifetime of the Ti/PbO2 anode. Furthermore, after five consecutive periodic electr...
Source: Chemosphere - Category: Chemistry Authors: Source Type: research