低浓度氰化氢在浸渍活性炭上的吸附净化研究  

Adsorption of Low-Concentration HCN on Impregnated Activated Carbon

作　　者：宁平[1] 蒋明[1] 王学谦[1] 杨弘[1] 师雁[1] 柏杨巍[1] 

机构地区：[1]昆明理工大学环境科学与工程学院,云南昆明650093

出　　处：《高校化学工程学报》2010年第6期1038-1045,共8页Journal of Chemical Engineering of Chinese Universities

基　　金："863"高技术计划资助项目(2008AA062602);国家自然科学基金项目(50708044)

摘　　要：采用浸渍法改性活性炭吸附脱除低浓度氰化氢(HCN),研究了NaOH与磺化酞菁钴(CoPcS)混合浸渍改性活性炭净化HCN的性能。研究表明:改性炭在制备过程中适当增加NaOH的浓度有利于提高其吸附HCN的能力,当NaOH浸渍液浓度为10%时,CoPcS/NaOH配比0.15mg·g-1、焙烧温度350℃为最佳制备条件;吸附反应阶段较适宜的体积空速为923h-1、氧体积分数2%、吸附温度为90℃。N2吸附表征了活性炭的比表面积和孔结构性质,与原活性炭相比,CoPcS与NaOH混合浸渍改性活性炭的比表面积和孔体积有所降低,但对HCN的吸附能力却显著提高,说明HCN与浸渍剂在活性炭表面发生了化学反应;孔径分布说明HCN在改性炭的中孔或大孔上参与化学吸附造成微孔扩充,而不是微孔填充和覆盖。The activated carbon was modified by impregnation with NaOH and the mixture of NaOH and sulfonated cobalt phthalocyanine（CoPcS）,and its performance of removing low-concentration HCN was studied.The results show that,in the modification process,increasing the NaOH concentration properly can enhance the adsorption of HCN on the modified activated carbon.When the NaOH concentration used in impregnation is 10%（wt）,the optimum conditions for preparing modified activated carbon with NaOH and CoPcS are CoPcS/NaOH mass ratio of 0.15 mg·g-1 and the cremation temperature of 350℃.The suitable conditions for the HCN adsorption of the prepared modified activated carbon were found,which are volume space velocity of 923 h-1,oxygen content of 2% and adsorption temperature of 90℃.The specific surface and the pore structure properties of the modified activated carbons were tested by N2 adsorption experiments.Compared with the virgin activated carbon,the specific area and pore volume of the impregnated ones are reduced,while the HCN adsorption ability increases.The N2 adsorption tests also show that,after HCN adsorption,the specific area and pore volume of the modified activated carbon increase and which are mainly caused by the increase of the micro pores.These results indicate that the HCN is chemically adsorbed at the pores of modified activated carbon with medial or macro size,and the adsorbed HCN could swell the micropores.It also indicates that the adsorption mechanism of micropore filling and covering could be excluded.

关 键 词：氰化氢 浸渍活性炭 吸附净化 磺化酞菁钴 

分 类 号：TQ028.15[化学工程]