Electrochemical oxidation of Reactive Blue 19 on boron-doped diamond anode with different supporting electrolyte. Issue 4 (August 2020)

• Record Type: Journal Article
• Authors: Li, Wei; Liu, Guoshuai; Miao, Dongtian; Li, Zhishen; Chen, Yinhao; Gao, Xiaolei; Liu, Ting; Wei, Qiuping; Ma, Li; Zhou, Kechao; Yu, Zhiming
• Is Part Of: Journal of environmental chemical engineering. Volume 8:Issue 4(2020)
• Publication Date: 2020-08
• Subjects: Electrochemical oxidation -- BDD -- different electrolyte -- RB-19; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2020.103997
• Languages: English
• ISSNs: 2213-2929

Abstract

Highlights: BDD-PS EAOP was used to treat RB-19 simulated dye wastewater. Persulfate electrolyte has excellent temperature adaptability. BDD-PS system can degrade organics efficiently with low energy consumption. BDD-PS system can effectively degrade wastewater in a wide pH range (1.5-12). Abstract: In this study, boron-doped diamond film (BDD) electrode with high sp 3 /sp 2 ratio was prepared by hot filament chemical vapor deposition (HFCVD). A systemic electrochemical advanced oxidation processes (EAOPs) study was carried out by using BDD anode and three different supporting electrolyte (Na2 SO4, NaCl, and Na2 S2 O8 ) to degrade the high volume and high concentration (0.5 L, 100 mg L -1 ) simulated anthraquinone Reactive Blue 19 (RB-19) dye wastewater. BDD-PS (persulfate) system was used to study the effects of current density, initial pH and solution temperature on decolorization degree and mineralization rate (TOC removal rate) by comparing with other two electrolytes (NaCl and Na2 SO4 ). BDD activated PS could effectively degrade RB-19 in a large pH range (1.5-12), and higher degradation efficiency and lower energy consumption under strong acid and alkali conditions than traditional BDD-EO based on Na2 SO4 and NaCl electrolytes. More interestingly, at the temperature of 70 ℃, the TOC removal reached 90% in 30 min and 100% in 60 min, which is apparently higher than that under NaCl and Na2 SO4 as electrolytes. Our work indicates BDD-PS technology can effectively degrade organic wastewater, which has the characteristics of efficiently and better pH applicability, and more importantly which can decompose RB-19 with the aid of increase of temperature.