低电荷柱撑蒙脱土对考马斯亮蓝的吸附性能研究

Research on Adsorption Properties of Charge-Reduced Lithiated Bentonite for Coomassie Brilliant Blue

采用微波法制得低电荷锂化蒙脱土(the reduced-charge lithiated bentonite,RCBT),再制备羟基铝柱撑剂,插层于RCBT中制备低电荷铝柱撑蒙脱土(the aluminum-pillared bentonite,Al/RCBT)。对Al/RCBT进行结构和形貌表征并考察它对考马斯亮蓝的吸附性能。研究表明:羟基铝柱撑剂成功插入RCBT层间,使蒙脱土的层间距增大了0.78 nm;最佳吸附pH值为2,吸附30 mg/L考马斯亮蓝溶液40 min即达到平衡,吸附容量达17 mg/g;Al/RCBT对考马斯亮蓝的吸附符合准二级动力学模型和Freundlich等温模型。

The reduced-charge lithiated bentonite(RCBT)was prepared by the microwave method,and then the aluminum-pillared bentonite(Al/RCBT)was prepared from the hydroxy aluminum pillaring agent intercalation RCBT.The structure of Al/RCBT was characterized and its adsorption performance for Coomassie Brilliant Blue was investigated.Studies have shown that:the aluminum hydroxy pillaring agent was successfully inserted between the RCBT layers,which increases the interlayer spacing of the bentonite by 0.78nm;the best adsorption pH value is 2,the adsorption of 30mg/L Coomassie brilliant blue solution reaches equilibrium within 40 minutes,and the adsorption capacity is 17mg/g;The adsorption of Coomassie Brilliant Blue by Al/RCBT conforms to the quasisecond-order kinetic model and Freundlich isotherm model.