氧化改性竹炭脱除单质汞的特性与机理分析

Removal of elemental mercury using bamboo charcoal modified by oxidants

将可再生的竹子作为活性炭的前驱体制备得到的竹炭,是一种廉价的多孔材料.在小型试验台架上研究了其脱汞性能,同时为强化竹炭对汞的吸附和氧化作用,采用化学浸渍法对原始竹炭进行了氧化改性,着重研究了改性竹炭的的汞吸附性能,并对改性前后的样品进行了元素分析、XPS表征、FT-IR分析、比表面积及孔径分布分析等以研究表面官能团在改性过程中的转化规律和脱汞机理.结果表明:氧化对竹炭的物理结构破坏严重,比表面积和孔容有明显的下降,但是氧化改性明显提高了竹炭的汞脱除性能.

The renewable bioresource of bamboo constitutes an important precursor for activated carbon,and the bamboo charcoal（BC） may act as low-cost sorbent used in the mercury-control.The simple impregnation method was used to modify the BC with KMnO4 and HNO3 separately,their adsorptive potential for elemental mercury was investigated for the first time conducted with a bench-scale bed.BET,XPS,elemental analysis and FT-IR were conducted to study the pore structure and surface chemistry.The results suggested the BET surface area and total pore volume of most modified BC were lower than the original BC but had excellent adsorption potential for elemental mercury even at a relative higher temperature.