叶蜡石及其改性粉体对亚甲基兰吸附行为的研究  

Study on the Removal of Methylene Blue from its Aqueous Solution by Raw and Modified Pyrophyllite Powders

作　　者：周艳[1] 谢佑南[1] 张俭[1] 李涓[1] 盛嘉伟[1] 

机构地区：[1]浙江工业大学化学工程与材料学院,浙江杭州310032

出　　处：《高校化学工程学报》2010年第1期47-51,共5页Journal of Chemical Engineering of Chinese Universities

基　　金：浙江省科技厅计划项目(优先主题)(2007C11104-2)资助项目

摘　　要：本实验将叶蜡石原矿粉进行改性处理，制备了酸洗粉、球磨粉、酸洗．球磨粉三种改性粉体，从动力学、热力学两个方面系统研究并比较了叶蜡石原矿粉及其改性粉体对水溶液中亚甲基兰（MB）的吸附行为。动力学结果表明，叶蜡石对MB的吸附动力学曲线符合伪二阶反应模型；酸洗-球磨粉快速阶段的吸附反应速率明显大于原矿粉，酸洗．球磨粉的吸附量在反应开始5min时达4．24mg．g^-1，而原矿粉为3．71mg．g^-1。热力学结果表明，酸洗．球磨粉的平衡吸附容量也较原矿粉明显增大，在MB溶液浓度10,-60mg．L^-1范围内，酸洗．球磨粉的平衡吸附容量为4．82～10．54mg．g^-1，而原矿粉为4．55--9．59mg．g^-1；吸附方式均符合Langmuir吸附模型。Raw pyrophyllite powder was modified by pickling, grinding and pickling-grinding treatments, separately. The kinetic and thermodynamic studies on the adsorption behavior of the raw pyrophyllite powder and its above modified powders were systematically conducted respectively by using them to adsorb the MB （methylene blue） from its aqueous solution, and the results were compared with each other. The kinetic study results show that the adsorption kinetics of all above pyrophyllite powders agree well with the pseudo-second-order model, and the treatments of pickling and grinding facilitate the adsorption process of the modified pyrophyllite powders. It was found that, after 5 min, the MB adsorption capacity is 4.24 mg.g-~ for pickling-grinding powder, while it is only 3.71 mg.g^-1 for raw powder. The thermodynamic study results show that the equilibrium adsorption capacity of pickling-grinding powder is larger than that of untreated raw powder; when the concentration of MB aqueous solution is in the range of 10-60mg.g^-1, the equilibrium adsorption capacity of pickling-grinding powder is 4.82-10.54mg.g^-1, while the equilibrium adsorption capacity of raw powder is 4.55-9.59 mg.g^-1. The adsorption isotherms indicate that the adsorption processes of the raw and modified pyrophyllite powders agree well with the Langmuir adsorption model.

关 键 词：叶蜡石 吸附 酸洗 球磨 

分 类 号：O647.314[理学—物理化学] TQ424.21[理学—化学]