MnO2改性硅藻土对Pb2+的吸附研究
Journal: Ecological Environment and Protection DOI: 10.12238/eep.v3i10.1076
Abstract
制备了MnO2改性硅藻土,探究了对含Pb2+废水的吸附性能,用XRD、FITR、N2吸附脱附和零电荷点等手段进行表征,考察其预吸附、pH因素、吸附剂用量、动力学、温度、浓度变化和解吸对Pb2+的吸附效果影响变化。结果表明：pH为4.00、吸附剂用量为0.05g、平衡时间30min,环境温度35℃时MnO2改性硅藻土对100mg/L含铅废水吸附效果最好,最大吸附量为85.26 mg/g；吸附过程符合准二级动力学方程和Freundlich模型,经Dubinin-Radushkevich模型计算,吸附机理属于化学吸附；用0.5mol/LHCl解吸效果最好。
Keywords
硅藻土；MnO2；Pb2+；吸附
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