腐殖土对废水中Cu2+的吸附

Adsorption of Cu2+ in wastewater on Humus Soil

摘要:

研究了腐殖土对废水中Cu2+的吸附，并考察了吸附时间、Cu2+初始浓度、腐殖土投加量、初始pH和温度等因素对吸附过程的影响。通过吸附动力学、吸附等温线和红外光谱(FTIR)等方法探讨了吸附机理。试验条件下，单位腐殖土对Cu2+的吸附量随时间的延长而增加直至达到吸附平衡、随Cu2+初始浓度增大和初始pH值的上升而增加、随腐殖土投加量的增加而减少，吸附过程温度的影响不显著。腐殖土吸附Cu2+的过程符合Lagergren准二级吸附速率方程和Freundlich吸附等温方程，吸附过程以化学吸附为主，红外光谱(FTIR)分析表明参与吸附的主要基团是羟基和芳香基等化学基团。

Abstract:

A batch test was made to evaluate the adsorption properties of Copper on humus soil. Several factors have been studied with regarding their effects on adsorption characteristics, such as adsorption time, initial concentration, humus dosage, initial pH and temperature. Furthermore the relevant mechanisms have been studied with assistance of adsorption kinetics, adsorption isotherm and FTIR. The results show that the amount of Cu2+ adsorbed on humus soil increases with adsorption time until it reaches equilibrium, and increases with the increase of initial Cu2+concentration and initial solution pH value, while decreases with the increase of humus dosage, and temperature almost does not affect the adsorption. The adsorption process follows the pseudo-second-order model and Freundlich adsorption isotherm equations, and the adsorption process mainly bases on chemical adsorption. The analysis of FTIR indicates that the main groups involved in adsorption are hydroxyl and aromatic.