孙玉焕，赵娇娇，吴友浩，李 青

SDS-硅藻土吸附亚甲基蓝和孔雀石绿染料的动力学和热力学

孙玉焕，赵娇娇，吴友浩，李 青

（青岛科技大学，山东 青岛 266042）

文章主要研究了SDS－硅藻土对亚甲基蓝和孔雀石绿两种染料的吸附动力学和热力学。研究结果表明，SDS-硅藻土对亚甲基蓝和孔雀石绿的平衡吸附量分别为16.3mg/g和20.1mg/g。亚甲基蓝和孔雀石绿在SDS－硅藻土上的吸附行为均可用Langmuir等温方程来描述，20℃时的相关系数分别为0.939 1和0.963 6，升温有利于吸附的进行。准二级吸附速率方程能更好的描述亚甲基蓝和孔雀石绿在SDS－硅藻土上的吸附动力学，20℃时的相关系数分别为0.991 0和0.990 8。通过计算不同温度各热力学参数ΔG、ΔH 和ΔS，理论上证实该吸附为一自发的吸热过程，且以物理吸附为主。

SDS-硅藻土；吸附；动力学；热力学

Abstract: The kinetics and thermodynamics of adsorption of methylene blue and malachite green on SDS-diatomite were investigated mainly. The results indicated that the adsorption capacity of methylene blue and malachite green on SDS-diatomite was 16.3mg/g and 20.1mg/g, respectively. Equilibrium data of Langmuir isotherms showed significant relationship to the adsorption of methylene blue and malachite green on SDS-diatomite, the correlation coefficient was 0.939 1 and 0.963 6 at 20℃, and the adsorption process was increased with the increasing temperature. Adsorption process of SDS-diatomite to methylene blue and malachite green accorded with pseudo-second order kinetic equations, the correlation coefficient was 0.991 0 and 0.990 8 at 20℃. At different temperatures by calculating the thermodynamic parameters ΔG, ΔH and ΔS, confirmed that the adsorption reaction was a spontaneous endothermic process theoretically, and the adsorption process was physical adsorption dominantly.

Key words: SDS-diatomite; adsorption; kinetics; thermodynamics

染料废水具有排放量大、有机物含量高、色度深、可生化性差等特点，成为难处理废水之一[1-2]。硅藻土在我国储量丰富，且其具有独特的微孔结构、较大的比表面积、强吸附性、耐高温等物理性能，已经被广泛用于处理含油废水、吸附重金属离子以及处理染料废水等[3-4]。近年，有关硅藻土处理染料废水的研究较为广泛，但有关改性硅藻土处理有机废水及其吸附机理的研究较少，尤其缺乏从动力学和热力学角度对其吸附行为进行系统研究。本文主要研究了亚甲基蓝和孔雀石绿在SDS-硅藻土上的吸附特性，并从动力学和热力学角度分析其吸附机理，以期为硅藻土在染料废水中的应用提供理论依据。……