孔雀石绿在高岭土上吸附行为和模型研究

Study on the behavior and model of malachite green adsorption on Kaolin

研究了孔雀石绿(MG)在高岭土上的吸附行为、等温吸附模型和吸附动力学。分别考察了吸附时间、p H值、高岭土投加量、孔雀石绿初始浓度等因素对孔雀石绿去除的影响。结果表明,吸附时间30 min,高岭土投加量16 g/L,中性条件下就能达到较好的孔雀石绿去除效果。高岭土对孔雀石绿吸附符合Langmuir、Freundlich、Temkin模型,最大吸附量为5.37 mg/g。吸附动力学符合准二级动力学模型。

The adsorption behavior,isotherm model and dynamics of malachite green（ MG） on Kaolin have been studied. The effects of adsorption time,p H value,Kaolin dosage,malachite green initial concentration on malachite green removal have been investigated,respectively. The results show that the better malachite green removal effect can be obtained in the adsorption time of 30 min,Kaolin dosage of 16 g / L and neutral solution. The adsorption of malachite green on Kaolin fits with Langmuir,Freundlich and Temkin models,and the maximum adsorption capacity is 5. 37 mg / g. The adsorption dynamic model fits with pseudo-second-order dynamic model.