Efficient electrochemical degradation of X-GN dye wastewater using porous boron-doped diamond electrode. (November 2022)

• Record Type: Journal Article
• Authors: Tang, Yining; Liu, Mengli; He, Deliang; Pan, Rong; Dong, Wei; Feng, Shangce; Ma, Li
• Is Part Of: Chemosphere. Volume 307:Part 2(2022)
• Publication Date: 2022-11
• Subjects: Dye wastewater -- X-GN -- BDD -- AOP -- Degradation -- Electrochemical parameters; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2022.135912
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Surface porous Ti substrates were obtained by electrodeposition–hot melt–alkali etching. Porous-Ti/BDD and flat-Ti/BDD electrodes were prepared for comparative study. The results of SEM, Raman, and XRD analyses show that the BDD films of these two electrodes had good uniformity and stable quality. The electrochemical window (EW) and electrochemical-active surface area (EASA) of the porous-Ti/BDD electrode is as high as 4.21 V and 22.78 cm 2 (11.39 cm 2 /cm 2 ), respectively. Furthermore, the electrochemical catalytic performance and degradation mechanism of porous-Ti/BDD electrode as the anode were studied by the electrolysis of Active Orange dye X-GN (X-GN), and the optimal electrochemical degradation operating parameters were obtained. The results show that when the degradation time was 50 min, the X-GN was completely decolorized. The TOC removal rate reached 69.24%, and the energy consumption was 5.62 kWh m −3 . The contribution rate of OH and SO4 − was calculated to be 91.40% and 1.26% by radical quenching experiments, respectively, indicating that the active substances in the degradation system were mainly OH and SO4 − . The high specific surface characteristics of porous-Ti/BDD electrode enhanced its electrochemical oxidation advantages, and it showed a high degradation efficiency and low energy consumption for the treatment of X-GN simulated wastewater. Graphical abstract: Image 1 Highlights: The surface porous Ti substrate was obtained by the method of electrodeposition-hot-melt-alkaline etching. Porous-Ti/BDD electrode EASA up to 11.39 cm 2 /cm 2 . The oxygen evolution potential and electrochemical window are 2.99 V and 4.21 V, respectively. Excellent performance in electrochemical catalytic oxidation of X-GN.