Study on Absorption of Cu~(2+) by Inorganic Colloid of Brown Desert Soil in Xinjiang

选用采自新疆阿克苏地区典型的棕漠土壤,用模拟吸附方法研究棕漠土无机胶体在不同阴阳离子作用下对Cu2+的吸附特征,得出:棕漠土无机胶体对铜的等温吸附曲线可以用Langmuir等温方程式拟合,解吸后,铜在胶体内的残余量与加入溶液的浓度呈很好的一次函数关系;随着加入支持电解质浓度的增加,胶体对铜的吸附量逐渐减少;不同电解质溶液对土壤无机胶体吸附铜的影响不一样,在Cl-存在下,对铜竞争吸附的影响K+>NH4+>Na+;当支持电解质阳离子浓度相同时,阴离子对胶体吸附铜的影响都为SO42->Cl-This paper chose typical brown desert soil from Aksu,Xinjiang,studied the absorption of Cu2+ by inorganic colloid,the results as follows: Isothermal adsorption curve of copper absorbed by brown desert soil can match with Langmuir equation well,after desorption the relationships between original Cu2+ concentration and remainder Cu2+content in colloid was a linear function.With the increasing of electrolyte strength,the absorption quantity of Cu2+ by colloid decreases gradually;Different compounded negative ion and positive ion have different influence on copper absorbed by colloid.When negative ion is Cl-only in solution,the order of the influence on copper absorption is K+>NH4+ >Na+.SO42-on copper absorption is higher than that of Cl-