茶叶渣对孔雀石绿吸附性能研究

摘要

研究了茶叶渣对孔雀石绿( MG)的吸附性能、等温吸附模型和吸附动力学。分别考察了吸附时间、pH值、茶叶渣投加量、孔雀石绿初始浓度、温度等因素变化对孔雀石绿吸附效果的影响。结果表明,吸附时间4 h,茶叶投加量2 g/L,中性条件下就能达到较好的孔雀石绿去除效果。茶叶渣对孔雀石绿吸附符合Langmuir、Freundlich、Temkin模型,最大吸附量为79.37 mg/g。吸附动力学符合准一级、准二级动力学模型。茶叶渣对孔雀石绿的吸附是吸热过程。%The adsorption behavior,isotherm model and dynamics of malachite green ( MG) on tea waste have been studied. The effects of adsorption time, pH value, tea waste dosage, MG initial concentration and temperature on MG adsorption have been investigated,respectively. The results show that the better MG removal effect can be obtained in the adsorption time of 4 h,tea waste dosage of 2 g/L and neutral so-lution. The adsorption of malachite green on tea waste fits with Langmuir,Freundlich and Temkin models, and the maximum adsorption capacity is 79. 37 mg/g. The adsorption dynamic model fits with pseudo-first-order and pseudo-second-order dynamic model. The adsorption of malachite green on tea waste is en-dothermic process.