环氧氯丙烷改性甘蔗渣吸附水中Pb^(2+)的研究  

Study on the Adsorption of Pb^(2+) from Aqueous Solutions by Bagasse Chemically Modified with Epichlorohydrin

作　　者：陈庆[1] 李芬芳[1,2] 戴友芝[1] 

机构地区：[1]湘潭大学环境科学与工程系,重金属污染控制湖南省普通高等学校重点实验室,湖南湘潭411105 [2]长沙环境保护职业技术学院环境科学系,湖南长沙410004

出　　处：《湘潭大学自然科学学报》2014年第1期86-90,共5页Natural Science Journal of Xiangtan University

基　　金：国家水专项十一五增补课题(2010ZX07212-008);湖南省科学技术厅科技计划重点项目(2011SK2016);改性甘蔗渣吸附处理重金属废水的性能及机理研究(CX2011B266);湖南省高校创新平台开放基金项目(11K070)

摘　　要：用环氧氯丙烷对甘蔗原渣进行化学改性,考察了改性甘蔗渣(MB)对Pb2+的吸附特性及其影响因素,并用红外光谱法分析了MB吸附Pb2+的机理.结果表明:MB吸附Pb2+的最佳工艺条件为pH=7,投加量1g/L,吸附时间1h;在最佳工艺条件下,MB对Pb2+的最大平衡吸附量为41.34mg/g,是甘蔗原渣的6.79倍;Cd2+的存在会降低MB对Pb2+的吸附量;通过分析MB吸附Pb2+前后的红外图谱变化可知,在MB吸附Pb2+的过程中,羟基、C-O键和C-H键均起到重要作用,吸附过程以化学络合为主;MB经0.1mol/L硫酸溶液再生后可重复利用.Bagasse, chemically modified by epichlorohydrin, had been used for adsorption of Pb2＋ and the influencing factors were investigated. The adsorption mechanism was examined by FTIR. The results indi- cated that the optimum adsorption conditions for pH, the dose of modified bagasse{ MB）, adsorptive time were 7, 1 g/L and 1 h, respectively. And at these optimum conditions, the maximum adsorption capacity of Pb2＋ on MB would reach 41.34 mg/g, 6.79 times as much as that on bagasse. The adsorption capacity of Pb2＋ on MB could be reduced in the presence of Cd2＋. Hydroxyl groups, carbon-oxygen single bonds and carbon hydrogen bonds all played important roles in the adsorption process of Pb2＋ on MB and chemical complexation was the main mechanism by analyzing the changes in infrared spectrum of MB after adsorption of Pb2＋. MB could be reused after regenerated by 0.1 mol/L sulfuric acid solution.

关 键 词：吸附 改性甘蔗渣 PB2+ 

分 类 号：X705[环境科学与工程—环境工程]