Gas-Phase Mercury Removal by Modified Activated Carbons Treated with Ar-O 2 Non-Thermal Plasma under Different O 2 Concentrations

作者：Long Wu, Zhongsheng Shang, Hailu Zhu, Zhanyong Li, Guangqian Luo, Hong Yao · 发表于：International Journal of Chemical Reactor Engineering · 年份：2018 · DOI：10.1515/ijcre-2018-0093 · 被引用次数：8 · 研究领域：Mercury impact and mitigation studies、Plasma Applications and Diagnostics、Analytical chemistry methods development

Abstract During the plasma modification process on activated carbon surface, reactive gas of O 2 in the plasma field dominates the formation of oxygen-containing groups on activated carbon surface, which is a key factor that affects the mercury adsorption. Previous studies showed that change the O 2 concentration would influence the generation of oxygen-containing groups and thus affect the mercury adsorption. It is important to investigate the effects of O 2 concentration in the non-thermal plasma field on the mercury adsorption characteristic of modified activated carbon. This work presents the results of the novel use of non-thermal plasma in Ar-O 2 gas to increase surface oxygen functionality on the surface of a commercially available biomass carbon. The volume fraction of O 2 in the Ar-O 2 mixture was varied from 10 % to 100 %. The surface physical and chemistry properties of modified activated carbon were analyzed by using BET, FT-IR and XPS techniques. Results showed that activated carbon modified by Ar-O 2 non-thermal plasma showed significantly better mercury removal performance compared with the original activated carbon. Moreover, increase O 2 concentration in the plasma field can further increase the mercury removal efficiency of modified activated carbon. Higher O 2 concentration can produce more O radicals during plasma system and facilitated the formation of carbonyl and ester groups on activated carbon surface and thus enhanced the mercury removal. Temperature...