Stabilized Hf-doped Ti/Sb-SnO electrode for efficient degradation of tetracycline.

Environ Sci Pollut Res Int

State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control On Chemical Processes, School of Resources and Environmental Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, P.R. China.

Published: July 2024

The electrochemical advanced oxidation process (EAOP) has shown significant promise in the field of refractory organic wastewater treatment due to its high efficiency and environmentally friendly nature. In this study, Ti/Sb-SnO electrodes with varying proportions of Hf were prepared using the sol-gel method. The addition of Hf transformed the original collapsing and broken surface into a flat and regular surface. The results demonstrated that Ti/Sb-SnO-Hf electrode doped with 6% Hf exhibited a higher oxygen evolution potential (OEP) and excellent stability. The OEP increased from 2.315 V without Hf-doping to 2.482 V, and the corresponding actual life was 321.05% higher than that without Hf. The current density (5-40 mA·cm), electrolyte concentration (0.02-0.2 mol·L), pH (3-11), and initial pollutant concentration (5-80 mg·L) were evaluated to confirm the tetracycline (TC) degradation characterization of Ti/Sb-SnO-6%Hf electrodes. It was concluded that under the optimal degradation conditions, the removal rate of TC could reach 99.66% within 2 h. The degradation of TC follows first-order reaction kinetics. The oxidative degradation of TC was achieved through indirect oxidation, with ·OH playing a dominant role. TC's electrochemical oxidation degradation pathway has been proposed: Based on LC-MS results, three main pathways are speculated. During the electrocatalytic oxidation process, decarboxylation, deamidation, and ring-opening reactions occur under ·OH attack, producing intermediate compounds with m/z values of 427, 433, 350, 246, 461, 424, 330, 352, 309, 263, and 233. These intermediates are further oxidized to intermediate compounds with an m/z value of 218. This work introduces a new efficient anode electrochemical catalyst for the degradation of TC, providing a strategy for industrial applications.

Download full-text PDF

Source
http://dx.doi.org/10.1007/s11356-024-34354-yDOI Listing

Publication Analysis

Top Keywords

oxidation process
8
intermediate compounds
8
compounds m/z
8
degradation
7
stabilized hf-doped
4
hf-doped ti/sb-sno
4
ti/sb-sno electrode
4
electrode efficient
4
efficient degradation
4
degradation tetracycline
4

Similar Publications

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!