十六烷基三甲基溴化铵柱撑膨润土的制备及其吸附刚果红特性研究

摘要

制备了十六烷基三甲基溴化铵柱撑膨润土,考察了pH、吸附剂用量、震荡时间、刚果红初始浓度和温度等条件对其吸附刚果红行为的影响,研究了热力学、动力学、等温线等.研究结果表明,十六烷基三甲基溴化铵柱撑膨润土较原土吸附能力强;吸附率随pH值增加而减小;吸附过程符合准二级动力学模型,化学吸附控制吸附速率;Langmuir等温模型与吸附过程相关系数较大,理论最大吸附量达819.83 mg/g;热力学参数表明熵增是吸附的推动力.本研究证实十六烷基三甲基溴化铵柱撑膨润土是具有前景的分离水环境中阴离子染料的吸附材料.%Cetyltrimethyl ammonium bromide pillared bentonite was prepared.The study on the adsorption of congo red onto the as-prepared material as functions pH,adsorbent dosage,shaking time,initial congo red concentration and temperature was carried out.Adsorptive thermodynamics,kinetics,and isotherms were further explored.The results showed that the pillared bentonite with cetyltrimethyl ammonium bromide had more adsorption capacity than original bentonite;the adsorption percentage decreased as pH increased;the adsorption process agreed with the pseudo-second-order model,indicating chemisorption controlled the adsorption process;Langmuir model had good correlation coefficient,figuring the theoretically maximal adsorption capacity of 819.83 mg/g;thermodynamics parameters proved that entropy increase was the driving force of adsorption.This research demonstrated that cetyltrimethyl ammonium bromide pillared bentonite was a promising adsorption material for removing anionic dye from aquatic environment.