皂土对CuSO_4的吸附性能研究

Study on Adsorption Capability of Bentonite to CuSO_4

研究了皂土对CuSO_4的吸附性能,考察了溶液初始pH、无机电解质NaCl、MgCl_2和AlCl_3及乙二胺四乙酸(EDTA)和柠檬酸等因素对皂土吸附量的影响。实验结果表明:皂土对CuSO_4有很强的吸附能力;其吸附动力学曲线和吸附等温线分别符合准二级反应速率方程和Langmuir方程;饱和吸附量达29.85 mg/g;随溶液初始pH增大,吸附量增大;无机电解质NaCl、MgCl_2和AlCl_3以及EDTA和柠檬酸均可以抑制CuSO_4在皂土上的吸附。

The adsorption capability of bentonite to CuSO4 was studied. The factors affecting the adsorption quantity on bentonite were investigated, such as： initial solution pH, inorganic electrolytes （NaCl, MgCl2 and AlCl3 ）, ethylenediamine tetraacetic acid （EDTA） and citric acid. The experimental results show that： The adsorption capability of bentonite to CuSO4 is strong; The adsorption kinetics curve and isotherm accord respectively with the quasi-second order reaction rate equation and Langmuir equation; The saturation adsorption quantity is 29.85 rag/g; The adsorption quantity increases with the increase of the initial solution pH; The addition of inorganic electrolytes （ NaCl, MgCl2 and AlCl3 ） and EDTA and citric acid can inhibit the adsorption of CuSQ on bentonite.