Enhanced capture of elemental mercury by bamboo-based sorbents.
Enhanced capture of elemental mercury by bamboo-based sorbents.
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竹基吸附剂增强了对元素汞的捕获。
DOI：
10.1016/j.jhazmat.2012.08.053
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发表时间：
2012-11
影响因子：
13.6
通讯作者：
Hancai Zen
中科院分区：
文献类型：
--
作者：
Zengqiang Tan;Jun Xiang;Sheng Su;Hancai Zen
为了开发低成本的气相元素汞脱除吸附剂，将再生竹子制成的竹炭(BC)和KI改性的BC(BC-I)用于元素汞的脱除。在固定床反应器上用在线汞分析仪考察了NO、SO2对KI改性BC吸附气相Hg0的影响。采用BET比表面积分析、程序升温脱附(TPD)和X-射线光电子能谱(XPS)等手段对脱附剂的孔结构和表面化学进行了表征。结果表明，与原BC相比，KI浸渍降低了吸附剂的比表面积和总孔体积。但BC-I在140℃和180℃的较高温度下对元素汞有较好的吸附能力，NO或SO2的存在会抑制汞的捕获，但BC-I具有较强的抗中毒能力。进一步分析了具体的反应机理。
To develop cost-effective sorbent for gas-phase elemental mercury removal, the bamboo charcoal (BC) produced from renewable bamboo and KI modified BC (BC-I) were used for elemental mercury removal. The effect of NO, SO2on gas-phase Hg0adsorption by KI modified BC was evaluated on a fixed bed reactor using an online mercury analyzer. BET surface area analysis, temperature programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS) were used to determine the pore structure and surface chemistry of the sorbents. The results show that KI impregnation reduced the sorbents’ BET surface area and total pore volume compared with that of the original BC. But the BC-I has excellent adsorption capacity for elemental mercury at a relatively higher temperature of 140°C and 180°C. The presence of NO or SO2could inhibit Hg0capture, but BC-I has strong anti-poisoning ability. The specific reaction mechanism has been further analyzed.
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