CAJ | 학술논문

以壳聚糖为吸附剂，考察溶液pH值、Pb2＋初始浓度等条件对壳聚糖吸附性能的影响，研究不同温度下壳聚糖对Pb2＋的吸附等温线、热力学和动力学行为，并研究表观活化能．结果表明，当pH为5～6时，壳聚糖对Pb2＋的吸附能力达到最大值；随着Pb2＋初始浓度增加，平衡吸附量随之增加并达到最大值，此后基本不变；当温度在298～313 K变化时，平衡吸附量随Pb2＋平衡浓度增大而增大，达到最大值后基本不变，吸附行为符合Langmuir方程；不同温度下的△G均小于零，且温度越高，△G越小，△H大于零，温度越高越有利于吸附；随着吸附时间延长，初始阶段吸附速率较快，此后逐渐下降，吸附动力学行为符合拟二级速率模型，吸附表观活化能为18．658 kJ/mol．
이각취당위흡부제，고찰용액pH치、Pb2＋초시농도등조건대각취당흡부성능적영향，연구불동온도하각취당대Pb2＋적흡부등온선、열역학화동역학행위，병연구표관활화능．결과표명，당pH위5～6시，각취당대Pb2＋적흡부능력체도최대치；수착Pb2＋초시농도증가，평형흡부량수지증가병체도최대치，차후기본불변；당온도재298～313 K변화시，평형흡부량수Pb2＋평형농도증대이증대，체도최대치후기본불변，흡부행위부합Langmuir방정；불동온도하적△G균소우령，차온도월고，△G월소，△H대우령，온도월고월유리우흡부；수착흡부시간연장，초시계단흡부속솔교쾌，차후축점하강，흡부동역학행위부합의이급속솔모형，흡부표관활화능위18．658 kJ/mol．
Effects of pH value and the initial concentration of Pb2+ions on the adsorption performance were investigated by using the chitosan as an adsorbent.Then,the isotherm,thermodynamics and kinetics were studied for the adsorption of Pb2+ ions onto chitosan at the different temperatures.Further,the apparent activation energy was calculated.Results indicated that,the adsorption capacity of Pb2+ions onto chitosan reach a maximum value in pH range 5 ~6.With increasing the initial concentration of Pb2+ions,the equilibrium capacity increase,then reach a maximum value,and finally do not change.When temperature are change in the range of 298~313 K,the equilibrium capacity increase with the equilibrium concentration of Pb2+ions and then do not change any more,and the Langmuir equation fit perfectly to the experimental datum.△G is less than zero at the different temperatures,and decrease with increasing temperature.△H is greater than zero,which indicate that the higher the temperature is,the easier the adsorption is.With increasing the adsorption time,the adsorption rate increase rapidly at the initial stage and then decrease gradually,and the adsorption kinetics follow the pseudo-second rate equation.The apparent activation energy is 18.658 kJ/mol.