磁性壳聚糖/γ-Fe_2O_3复合膜吸附甲基橙性能研究  

Adsorption of methyl orange on magnetic chitosan/γ-Fe_2O_3 composite film

作　　者：沈婷婷[1] 胡煜超[1] 朱华跃[1] 蒋茹[1] 

机构地区：[1]台州学院环境工程系,浙江临海317000

出　　处：《印染助剂》2012年第1期27-31,共5页Textile Auxiliaries

摘　　要：以壳聚糖、γ-Fe2O3为原料,采用流延法制备磁性壳聚糖/纳米γ-Fe2O3复合膜,以甲基橙溶液作为目标污染物,考察了吸附剂用量、溶液初始质量浓度、pH、共存阴离子等对吸附效果的影响,并对吸附动力学、热力学进行了初步探讨.结果表明:在pH=2.91、无共存阴离子的条件下,吸附效果最佳,去除率随着吸附剂用量的增加而提高.无机阴离子的存在对吸附容量有显著影响.壳聚糖/纳米γ-Fe2O3复合膜对甲基橙偶氮染料的吸附等温线符合Langmuir模型,吸附过程符合拟二级动力学方程,内扩散为主要控速步骤.吸附是熵推动的自发放热过程,低温有利于反应的进行.Magnetic chitosan/nano γ-Fe2O3 composite films were prepared by a solution casting technology using chitosan and γ-Fe2O3as materials. The effects of adsorbent dosage, initial concentration of methyl orange, pH, coexisting inorganic anions on the absorption were investigated using methyl orange solution as target pollutant. The absorption kinetic and thermodynamics were also discussed. The results indicated that the optimum absorption was attainted at pH=2.91 without existing any inorganic anions. The rate of decolorization enhanced with increasing adsorbent dosage. The effect of inorganic anions on adsorption capacity was remarkable. The absorption of methyl orange on magnetic chitosan/γ-Fe2O3 nanoparticles composite films followed the Langmuir isotherm model. The adsorption procedure met pseudo-second-order equation, and the intraparticle diffusion was the rate-controlling step. Lower temperature was favorable to adsorption due to the process was spontaneous and exothermic nature.

关 键 词：甲基橙 壳聚糖 纳米Γ-FE2O3 吸附 

分 类 号：TQ610.9[化学工程—精细化工]