纳米钨酸颗粒的合成及其对亚甲基蓝的吸附  

Synthesis of Nano-Tungstate Particle and Its Adsorption Properties for Methylene Blue

作　　者：杨保俊[1] 吴松[1] 张志刚 李茜[1] 王百年[1] 

机构地区：[1]合肥工业大学化学工程学院,安徽合肥230009 [2]江苏中建材环保研究院有限公司,江苏盐城224005

出　　处：《化学反应工程与工艺》2013年第4期379-384,共6页Chemical Reaction Engineering and Technology

摘　　要：通过低温液相法合成出正交晶型纳米钨酸(WO_3·H_2O)颗粒,考察了所合成的钨酸纳米颗粒对溶液中偶氮染料亚甲基蓝(MB)的吸附性能,并对其吸附动力学及吸附平衡进行了研究。结果表明,随着溶液pH值的升高,WO_3·H_2O对MB的吸附量增大;WO_3·H_2O对MB的吸附过程符合准二级反应动力学模型,表观活化能为35.95 kJ/mol;WO_3·H_2O对MB的吸附等温过程服从Langmuir方程,饱和吸附容量为46.51 mg/g;吸附热力学函数△H,△G,△S分别为66.07 kJ/mol,-3.82 kJ/mol和234.55 J/(mol·K),说明该吸附过程为自发的吸热过程。Orthorhombic nano-ngstate particles were synthesized by low-temperature liquid route. Batch experiments were carried out to investigate the adsorption kinetics and equilibrium of methylene blue onto WO3·H2O. The effect of initial pH value was evaluated. The experimental results showed that the adsorption was favorable under alkaline conditions. The kinetic experimental data was properly correlated with the pseudo-second-order kinetic model with the apparent activation energy 35.95 kJ/mol. The saturated adsorption capacity obtained from the Langmuir equation was 46.51 mg/g. The values of thermodynamic parameters of AG, AH and AS calculated were 66.07 kJ/mol, -3.82 kJ/mol and 234.55 J/（mol-K） respectively, which showed that the overall adsorption process was endothermic and spontaneous.

关 键 词：纳米钨酸 吸附 亚甲基蓝 动力学 

分 类 号：O614.6[理学—无机化学]