KMnO4改性甘蔗渣对水中Pb2+的吸附

摘要

Bagasse has bee n modified with KMnO4 solution having different concentrations and the physical and chemical properties of bagasse before and after the modification have been characterized by scanning electron micro-scopy(SEM),FTIR and XRD. The effects of the modified bagasse on the adsorption kinetics and adsorption isotherm of Pb2+are studied,and the adsorption mechanisms discussed preliminarily. The results show that the process of Pb2+adsorption by using modified bagasse is in conformity with pseudo-second order kinetics model. The adsorption iso-therm of Pb2+ 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 Pb2+by using KMnO4(30 mmol/L) modified bagasse can form inner surface complex.%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Pb2+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Pb2+的过程符合准二级动力学模型，改性甘蔗渣对Pb2+的吸附等温线符合Langmuir方程；KMnO4（0．5 mmol/L）改性甘蔗渣的吸附机理为化学配位反应；KMnO4（30 mmol/L）改性甘蔗渣吸附Pb2+的过程形成了内层表面络合物。