糠醛渣对染料甲基紫的吸附行为

以废弃物糠醛渣为原料制备吸附剂,研究了甲基紫溶液在糠醛渣上的吸附行为,并从热力学和动力学角度探讨了吸附作用机理。吸附平衡模型研究表明,糠醛渣对甲基紫的吸附符合Langmuir与Freundlich型的复合型吸附,即单层吸附和吸附剂表面非均质吸附同时存在;吸附动力学研究表明,糠醛渣对甲基紫的吸附符合准二级吸附动力学方程;热力学参数,ΔG0为-6.667 kJ.mol^-1--8.216kJ.mol^-1、ΔH0为16.866kJ.mol^-1、ΔS0为0.079 kJ.mol^-1.K^-1、为14.753 kJ.mol^-1,说明糠醛渣对甲基紫的吸附是自发进行的、吸热的,且主要为一物理吸附过程。糠醛渣作为吸附剂处理甲基紫废水,是一种有效的方法。该方法实现了以废治废的废物资源化目标,具有良好的社会效益和经济效益.

Study on Adsorption of Methyl Violet from Aqueous Solution by Furfural Residue

An adsorbent was synthesized from furfural residue.The properties,kinetics and thermodynamics of methyl violet from water adsorption process on furfural residue were studied.The adsorption isotherm indicates that the relationship between adsorbing capacity（qe） and equilibrium mass concentration（Ce） is in accordanced with the isothermal adsorption equations of Langmuir and Freundlich.The sorption kinetics studies show that sorption process of furfural residue for methyl violet was better fitted by peseudo-second-order equation;The thermodynamic parameters,ΔG0 was-6.667 kJ·mol-1~-8.216kJ·mol-1,ΔH0 was 16.866 kJ·mol-1,ΔS0 was 0.079 kJ·mol-1·K-1,was 14.753 kJ·mol-1,indicate that sorption process of furfural residue for methyl violet was decalescence reaction,physical adsorption.Methyl violet as an adsorptive material was an effectual method.The exploitation and utilization of this furfural residue will surely bring obvious economic and social benefit to us.