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Environmental Engineering Research 2021;26(5): 200394 DOI: https://doi.org/10.4491/eer.2020.394
Removal efficiency and mechanism of bio-treated coking wastewater by catalytic ozonation using MnO2 catalyst modified with anionic precursors
Jie Zhang1, Ben Dong1, Ding Ding2, Shilong He1, and Sijie Ge1 
1School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province, PR China
2SunRui Marine Environment Engineering Company, Qingdao 266101, Shandong Province, PR China
Corresponding Author: Sijie Ge ,Tel: +86 516 83591315, Email: gesijie@cumt.edu.cn
Received: July 15, 2020;  Accepted: September 14, 2020.
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ABSTRACT
In this paper, MnO2 catalyst were firstly prepared and modified by four kinds of anionic precursors (i.e., NO3-, AC-, SO42- and Cl-) through redox precipitation method. After that, bio-treated coking wastewater (BTCW) was prepared and employed as targeted pollutants to investigate the catalytic ozonation performance of prepared-MnO2 catalyst was investigated and characterized by the removal efficiencies and mechanism of the prepared bio-treated coking wastewater (BTCW), which was employed as the targeted pollutants. Specifically, the effects of specific surface area, crystal structure, valence state of Mn element and lattice oxygen content on catalytic activity of MnO2 materials were characterized by BET, XRD and XPS, respectively. Results showed that COD of BTCW could be removed 47.39% under MnO2-NO3- catalyst with 2 h reaction time, which was much higher than that of MnO2-AC- (3.94%), MnO2-SO42- (12.42%), MnO2-Cl- (12.94%) and pure O3 without catalyst (21.51%), respectively. So, MnO2-NO3- presented the highest catalytic performance among these catalysts. The reason may be attributed to a series of better physiochemical properties including the smaller average grain, the larger specific surface area and active groups, more crystal defect and oxygen vacancy, higher relative content of Mn3+ and adsorbed oxygen (Oads) than that of another three catalysts.
Keywords: Anionic precursors | Bio-treated coking wastewater | MnO2 catalyst | Ozonation
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