DFT; PCDD/Fs removal; SO2 adsorption; Activated carbon adsorption; Competitive mechanisms; Municipal solid-waste incinerations; Polychlorinated dibenzo-p-dioxin and dibenzofuran; Polychlorinated dibenzo-p-dioxin and dibenzofuran removal; SO 2; Solid waste incineration plant; Chemical Engineering (miscellaneous); Pollution; Process Chemistry and Technology
Abstract :
[en] In municipal solid waste incineration (MSWI) plants, activated carbon (AC) adsorption is the key technique for eliminating Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) from flue gases. This research thoroughly investigates the potential competitive adsorption between SO2 and PCDD/Fs and examines how adsorption at the center and the edge of the AC layer impacts the adsorption process. The findings show a decline in the removal efficiency of PCDD/Fs from 86.8 % to 84.2 % and further to 74.4 % when using SO2 pre-treated (AC-A3) and H2SO4-impregnated (AC-B2) activated carbon, respectively. Multiple characterization methods reveal that sulfur elements occupy active sites within the inner pores of the activated carbon, reducing the availability of its pore structure, particularly affecting microporous more than mesoporous structures. DFT calculations suggest that the π-π EDA effect facilitates the adsorption of 2,3,7,8-Tetrachlorodibenzo-p-dioxin (2,3,7,8-TCDD), whereas dispersion force drive SO2 adsorption. Comparisons among various oxygenated functional groups show that the organic acid anhydride (C[dbnd]O-C[dbnd]O) has better adsorption selectivity toward TCDD and less adsorption to SO2. This study provides a novel perspective on the adsorption mechanisms of PCDD/Fs on AC and the competitive dynamics of sulfur in the flue gas.
Disciplines :
Chemistry
Author, co-author :
Lai, Jianwen; State Key Laboratory for Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, China
Wang, Peiyue; State Key Laboratory for Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, China
Ma, Yunfeng; School of Environment, Hangzhou Institute for Advanced Study, UCAS, Hangzhou, China
Han, Zhongkang; School of Materials Science and Engineering, Zhejiang University, Hangzhou, China
Fiedler, Heidelore ; Université de Liège - ULiège > Département de chimie (sciences) > Chimie analytique, organique et biologique ; Örebro University, School of Science and Technology, Örebro, Sweden
Lin, Xiaoqing; State Key Laboratory for Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, China
Li, Xiaodong; State Key Laboratory for Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, China
Language :
English
Title :
Unveiling the competitive mechanism between SO2 and PCDD/Fs on activated carbon adsorption
NSCF - National Natural Science Foundation of China
Funding text :
This study was financially supported by the National Natural Science Foundation of China (52076192), the Program of Introducing Talents of Discipline to University (No. BP0820002).
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