化工学报2011，Vol.62Issue(7)：1944-1950,7.DOI:10.3969/j.issn.0438-1157.2011.07.024
氯化锌改性竹炭脱除单质汞的特性与机理分析
Performance and mechanism for elemental mercury removal by bamboo charcoal modified by ZnCl2
摘要
Abstract
Elemental mercury from coal combustion has become an increasingly environmental concern due to its high volatility and toxicity, and it has been found that activated carbon adsorption is an effective mercury-control method, but there exists high-cost limit. An important precursor for activated carbon is bamboo, a renewable bioresource, and bamboo charcoal (BC) may act as a low-cost sorbent used for mercury controlling. In this paper, the adsorptive potential of modified BC using ZnCl2 (Cl-BC) for elemental mercury was investigated in a bench-scale bed. Their pore structure and surface chemical properties were characterized by BET and XPS. The results suggested that Cl-BC had excellent adsorption potential for elemental mercury even at a relative higher temperature, and the enhancing-effect was more obvious with increasing Cl content. There was an optimum ZnCl2 concentration for impregnation. The increase of performance of Cl-BC is probably due to the increase of active sites for mercury adsorption. The kind of Cl functional groups on the original and ZnCl2-modified BC was found to be different, the latter is of the active site for mercury adsorption and oxidation, and for the former it is negligible. There is an optimum Cl content on the ZnCl2-modified BC for elemental mercury removal, and mercuric chloride could be formed during mercury sorption.关键词
汞/竹炭/改性/机理分析Key words
mercury/ bamboo charcoal/ modification/ mechanism study分类
能源科技引用本文复制引用
谭增强,邱建荣,向军,孙路石,刘子红,曾汉才,张盛诚..氯化锌改性竹炭脱除单质汞的特性与机理分析[J].化工学报,2011,62(7):1944-1950,7.基金项目
国家自然科学基金项目(51021065,51078163,50976038). （51021065,51078163,50976038）
