功能基团改性CeO_(2)介孔材料的制备及其吸附性能研究

Preparation and Adsorption Properties of Functional Group Modified CeO_(2) Mesoporous Materials

合成氨基和羧基功能基团改性CeO_(2)介孔材料,实验研究了其对Cu^(2+)的吸附性能。结果显示:当pH=9.0时,羧基改性的CeO_(2)对Cu^(2+)的吸附效果最好,吸附率达95.94%;氨基改性的CeO_(2)对Cu^(2+)的吸附效果当pH为8.0时最佳94.56%;随着吸附液初始[Cu^(2+)]的增大,Cu^(2+)的去除率先增大后减小,当初始[Cu^(2+)]分别为40 mg/L和30 mg/L,吸附效果最好;羧基改性CeO_(2)吸附剂用量为0.12 g/L时,对Cu^(2+)的吸附率最大为94.56%;吸附剂用量为0.16 g/L时,氨基改性CeO_(2)对Cu^(2+)的去除率趋于稳定91.36%,该吸附过程符合准二级动力学模型。

Carboxyl andamino modified CeO_(2)mesoporous material adsorbent was prepared by coprecipitation and grafting methods.The adsorption performance of heavy metal Cu^(2+)ions in water was investigated.The results showed that when pH=9.0 and 8.0,the adsorption effect on[Cu^(2+)]was the best respectively,the adsorption rate was 95.94%and 94.56%.With the increase of the initial Cu^(2+)concentration of the adsorption solution,the removal rate of Cu^(2+)and the cumulative adsorption capacity of Cu^(2+)first increase and then decrease.The adsorption effect was the best,when the initial Cu^(2+)concentration was 40 mg/L and 30 mg/L respectively.When the amount of carboxyl andamino modified CeO_(2)adsorbent was 0.12 g/L and 0.16 g/L,the removal rate of Cu^(2+)prefer to be stable,and the adsorption process conforms to the quasi second-order kinetic model.