Degradation of tetracycline hydrochloride by electrocatalytic oxidation using NiO@Co3O4/Ti electrode
Minqin Shi, Hongfu Wang, Pei‐Qing Yuan, Xinru Xu, Jingyi Yang
Abstract
Tetracycline hydrochloride (TC-H) belongs to a class of broad-spectrum antibiotics and is difficult to remove from the environment, posing potential hazards to human health as well as the aquatic environment. In this paper, NiO@Co 3 O 4 /Ti, a dimensionally stable anode with NiO as the core and Co 3 O 4 as the shell, was synthesized using a hydrothermal method . XRD , XPS , and SEM were conducted for characterization, revealing a constant charge transfer between Ni and Co, with mainly trivalent Co acting as the oxidant. The electrochemical characterization showed that the NiO@Co 3 O 4 /Ti electrode had a high oxygen evolution potential and low charge transfer resistance. Furthermore, 94.26 % of TC-H (100 mg/L) was degraded in 60 min under the optimal operating conditions (voltage of 10 V, 0.25 M NaCl, pH 7.88). According to radical quenching experiments, the active species O 2 − played an important role in the electrocatalytic oxidation process . In addition, the electrode maintained good stability after several degradation experiments.