KMnO_4改性甘蔗渣对水中Pb^(2+)的吸附

Adsorption of Pb^(2+) in water by KMnO_4 modified bagasse

采用不同浓度的高锰酸钾溶液对甘蔗渣进行改性,并用扫描电镜(SEM)、傅里叶红外光谱仪(FTIR)和X射线衍射(XRD)对改性前后甘蔗渣的物化性能进行表征。研究了改性甘蔗渣对Pb^(2+)的吸附动力学和吸附等温线,并对吸附机理进行初步探讨。结果表明:改性甘蔗渣吸附Pb^(2+)的过程符合准二级动力学模型,改性甘蔗渣对Pb^(2+)的吸附等温线符合Langmuir方程;KMn O4(0.5 mmol/L)改性甘蔗渣的吸附机理为化学配位反应;KMn O4(30 mmol/L)改性甘蔗渣吸附Pb^(2+)的过程形成了内层表面络合物。

Bagasse has been modified with KMnO, solution having different concentrations and the physical and chemical properties of bagasse before and after the modification have been characterized by scanning electron microscopy（SEM ）, FTIR and XRD. The effects of the modified bagasse on the adsorption kinetics and adsorption isotherm of Pb^2＋ are studied, and the adsorption mechanisms discussed preliminarily. The results show that the process of Pb^2＋ adsorption by using modified bagasse is in conformity with pseudo-second order kinetics model. The adsorption isotherm of Pb^2＋ by using modified bagasse is in conformity with Langmuir equation. The adsorption mechanism of KMnO4（0.5 mmol/L） modified bagasse is a chemical coordination reaction. The process of the adsorption of Pb^2＋ by using KMnO4（30 mmol/L） modified bagasse can form inner surface complex.