凹凸棒土负载壳聚糖对Cu2+吸附性能影响

Effect of attapulgite-loaded chitosan on adsorption of Cu2+

利用凹凸棒土为载体,将壳聚糖负载在凹凸棒土上,用于吸附水中Cu^2+。结果表明凹凸棒土负载壳聚糖吸附容量大于壳聚糖及凹凸棒土,并且从水中回收方便,在重复使用5次后对Cu^2+吸附率仍达到90.3%。单因素实验确定条件表明:Cu^2+初始浓度为20mg·L^-1,pH值为5,温度为20℃,吸附时间30min,吸附剂投加量为5g·L^-1时凹凸棒土负载壳聚糖对Cu^2+吸附量达到最大约为18.5mg·g^-1。整个吸附过程是放热反应,以化学吸附为主,符合Langmuir模型和准二级吸附动力学模型。

The attapulgite was used as a carrier,and chitosan was loaded on the attapulgite to adsorb Cu^2+in water.The results showed that the adsorption capacity of attapulgite-loaded chitosan was greater than that of chitosan and attapulgite ,and the separation from water was simple,the adsorption rate of Cu^2+still reached 90.3% after repeated use for 5 times.The conditions of single factor experiment showed that the initial concentration of Cu^2+was 20mg·L^1 ,the pH value was 5,the temperature was 20℃,the adsorption time was 30 min,and the dosage of adsorbent was 5 g·L^-1.The attapulgite-loaded chitosan had a maximum adsorption capacity of Cu^2+of about 18.5 mg·g^-1.The whole adsorption process was an exothermic reaction,mainly based on chemical adsorption,in accordance with the Langmuir model and the pseudo-second-order kinetic model.