Preparation of La-doped Ti/SnO2-Sb2O4 anode and its electrochemical oxidation performance of rhodamine B
In this paper, La-doped Ti/SnO 2 -Sb 2 O 4 electrode was prepared by electrodeposition and used for electrochemical degradation of rhodamine B. The optimum preparation conditions of the electrode were optimized as deposition time of 15 min and calcination at 500 ℃ for 2 h. The water treatment conditions were selected as initial pH 3.0, electrolyte Na 2 SO 4 concentration 0.1 M, current density 30 mA cm −2 , and initial rhodamine B concentration 20 mg L −1 ; the color and TOC removal of RhB reached 99.78% and 82.41% within 30 min. The FESEM, XRD, XPS, CV, LSV, and EIS characterization studies demonstrated that Ti/SnO 2 -Sb 2 O 4 -1%La electrode had a dense structure and the highest oxygen evolution potential (2.14 V) and lowest charge transfer resistance (0.198 Ω cm −2 ), indicating that doped La has lower energy consumption. Moreover, La doping can expand the specific surface area, active site, performance of pollutant degradation, and service life of the electrode. Especially, the service life of Ti/SnO 2 -Sb 2 O 4 -1%La is increased by three times, and the maximum life span reaches 90 min (1000 mA cm −2 , 1 M H 2 SO 4 ). Free radical quenching experiments show that ·OH plays a major role in the degradation of RhB. The Ti/SnO 2 -Sb 2 O 4 -1%La electrode prepared in this paper and its results will provide data support and reference for the design of efficient electrocatalytic electrode. Graphical
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