Effect of confined Mn oxides on regulating capability of activated coke for persulfate-based oxidation of a sweetener acesulfame
Guoting Li,
Haozhe Li,
Shude Zhang,
Xiao Mi,
Yujie Guo,
Zhixin Song,
Yuhao Liu,
Hongwei Pan,
Baogui Wang,
Yingxu Liu,
Weigao Zhao,
Tannaz Pak
Affiliations
Guoting Li
School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450011, China; Corresponding author.
Haozhe Li
School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450011, China
Shude Zhang
School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450011, China
Xiao Mi
School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450011, China; Corresponding author.
Yujie Guo
School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450011, China
Zhixin Song
School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450011, China
Yuhao Liu
School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450011, China
Hongwei Pan
School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou, 450011, China
Baogui Wang
Zhengzhou Sewage Purifying CO., LTD, Zhengzhou, 450000, China
Yingxu Liu
Zhengzhou Sewage Purifying CO., LTD, Zhengzhou, 450000, China
Weigao Zhao
School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China
Tannaz Pak
School of Computing, Engineering, and Digital Technologies, Teesside University, Borough Road, Middlesbrough, TS1 3BX, UK
Mn oxides are confined within the porous structure of activated coke (ACO) via impregnation followed by calcination treatment. The Mn-ACO sample calcined at 600 °C (Mn-ACO600) demonstrated superior performance despite containing only a minute atomic ratio of 0.11 % Mn on its surface. This treatment led to a slight increase in the specific surface area and pore volume of ACO, with a significant enhancement in the proportion of micropores, rising from 54.2 % in ACO to 71.8 % in Mn-ACO600. Raman spectroscopy indicated additional defects in Mn-ACO, while XPS analysis confirmed the coexistence of Mn(II), Mn(III), and Mn(IV) oxides. Although ACO adsorption alone was ineffective in removing acesulfame (ACE), Mn-ACO600 achieved a removal rate of 19.0 %. The introduction of peroxydisulfate (PDS) further boosted the degradation of Mn-ACO600, with a Kapp value that was 2.28 times of that of the combined Mn-ACO600 adsorption and PDS oxidation process, indicating a remarkable synergistic effect. To optimize the experimental conditions, a response surface methodology design analysis was conducted, revealing that solution pH and the dosage of Mn-ACO600 were crucial factors. Furthermore, the study confirmed non-radical oxidizing species, such as 1O2 and h+, played a predominant role in the process, with relatively minor contributions from radical oxidizing species.
