土壤中正丁基黄原酸钾与铅离子的吸附特性研究  

Adsorption Characteristic of Potassium Butylxanthate and Lead Ion in Soil

作　　者：孔秀[1] 刘耀驰[1] 

机构地区：[1]中南大学化学化工学院,长沙410083

出　　处：《化学通报》2015年第12期1138-1144,共7页Chemistry

基　　金：环保公益性行业科研专项(201309052)资助

摘　　要：通过静态试验研究了土壤对正丁基黄原酸钾的吸附性能和影响因素,以及正丁基黄原酸钾-铅复合污染体系的吸附平衡与动力学特征。结果表明,土壤对正丁基黄原酸钾的吸附过程遵循Lagergren二级动力学模型,等温吸附可用Freundlich模型拟合,提高温度有利于吸附,土壤对正丁基黄原酸钾的吸附属于内扩散控制过程;土壤吸附正丁基黄原酸钾最佳p H范围为5~9,p H较低时正丁基黄原酸钾易被酸解,碱性环境（p H〉10）将抑制土壤对正丁基黄原酸钾的吸附;正丁基黄原酸钾与Pb2＋形成难溶络合物而严重影响了Pb2＋在土壤中的吸附,使Pb2＋的吸附速率常数由38.319g/（mg·min）提高到70.350g/（mg·min）,平衡吸附量（qe）由1.909mg/g降低到1.385mg/g,且影响程度随着Pb2＋浓度的升高而减弱。Adsorption characteristic and influence factors of potassium butylxanthate（ PBX） to soil were investigated by static adsorption experiments. The adsorption equilibrium and kinetics of PBX-lead combined pollutants were studied. Results indicated that the adsorption kinetics could be described by Lagergren second-order model and the isotherm was well fitted by Freundlich equations. Rising the temperature is beneficial to the adsorption of butylxanthate. The degradation of PBX is rapidly increased at p H 5. p H 5 ~ 9 is the suitable range for adsorption of PBX,but at p H 10 the adsorption will be suppressed. Adsorption of Pb2 ＋to soil is seriously affected in the presence of PBX owing to a suspended product of the reaction between Pb2 ＋and PBX,adsorption rate constant increases from 38. 319 g /（ mg·min） to 70. 350 g /（ mg·min）,while equilibrium adsorption capacity（ qe） decreases from 1. 909 mg / g to 1. 385 mg / g. The impact degree reduces with the increase of Pb2 ＋concentration.

关 键 词：土壤 黄药 铅 复合污染 

分 类 号：X53[环境科学与工程—环境工程]