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Article

Catalytic Ozonation for Effective Degradation of Coal Chemical Biochemical Tail Water by Mn/[email protected] Catalyst

1
College of Urban Construction, Nanjing Tech University, Nanjing 211816, China
2
School of Environmental Sciences and Engineering, Nanjing Tech University, Nanjing 211816, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Mehrab Mehrvar
Water 2022, 14(2), 206; https://doi.org/10.3390/w14020206
Received: 1 December 2021 / Revised: 17 December 2021 / Accepted: 31 December 2021 / Published: 11 January 2022
An Mn/[email protected] mud (RM) catalyst was prepared from RM via a doping–calcination method. Scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy were used to characterize the surface morphology, crystal morphology, and elemental composition of the Mn/[email protected] catalyst, respectively. In addition, preparation and catalytic ozonation conditions were optimized, and the mechanism of catalytic ozonation was discussed. Lastly, a fuzzy analytic hierarchy process (FAHP) was adopted to evaluate the degradation of coal chemical biochemical tail water. The best preparation conditions for the Mn/[email protected] catalyst were found to be as follows: (1) active component loading of 3%, (2) Mn/Ce doping ratio of 2:1, (3) calcination temperature of 550 °C, (4) calcination time of 240 min, and (5) fly ash floating bead doping of 10%. The chemical oxygen demand (COD) removal rate was 76.58% under this preparation condition. The characterization results suggested that the pore structure of the optimized Mn/[email protected] catalyst was significantly improved. Mn and Ce were successfully loaded on the catalyst in the form of MnO2 and CeO2. The best operating conditions in the study were as follows: (1) reaction time of 80 min, (2) initial pH of 9, (3) ozone dosage of 2.0 g/h, (4) catalyst dosage of 62.5 g/L, and (5) COD removal rate of 84.96%. Mechanism analysis results showed that hydroxyl radicals (•OH) played a leading role in degrading organics in the biochemical tail water, and adsorption of RM and direct oxidation of ozone played a secondary role. FAHP was established on the basis of environmental impact, economic benefit, and energy consumption. Comprehensive evaluation by FAHP demonstrated that D3 (with an ozone dosage of 2.0 g/H, a catalyst dosage of 62.5 g/L, initial pH of 9, reaction time of 80 min, and a COD removal rate of 84.96%) was the best operating condition. View Full-Text
Keywords: ozone catalyst; red mud; catalytic oxidation; biochemical tail water; model evaluation ozone catalyst; red mud; catalytic oxidation; biochemical tail water; model evaluation
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MDPI and ACS Style

Wang, Y.; Wang, Y.; Lu, X.; Sun, W.; Xu, Y.; Zhou, J.; Sun, Y. Catalytic Ozonation for Effective Degradation of Coal Chemical Biochemical Tail Water by Mn/[email protected] Catalyst. Water 2022, 14, 206. https://doi.org/10.3390/w14020206

AMA Style

Wang Y, Wang Y, Lu X, Sun W, Xu Y, Zhou J, Sun Y. Catalytic Ozonation for Effective Degradation of Coal Chemical Biochemical Tail Water by Mn/[email protected] Catalyst. Water. 2022; 14(2):206. https://doi.org/10.3390/w14020206

Chicago/Turabian Style

Wang, Yicheng, Yingkun Wang, Xi Lu, Wenquan Sun, Yanhua Xu, Jun Zhou, and Yongjun Sun. 2022. "Catalytic Ozonation for Effective Degradation of Coal Chemical Biochemical Tail Water by Mn/[email protected] Catalyst" Water 14, no. 2: 206. https://doi.org/10.3390/w14020206

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