磁性活性炭的制备及吸附去除水中甲基橙的研究  

Preparation of magnetic active carbon and its adsorption of methyl orange in aqueous solution

作　　者：黄辉[1] 樊一帆[1] 张国飞[1] 方德安[1] 张敏波[1] 陶士英[2] 

机构地区：[1]宁波工程学院化工学院,浙江宁波315016 [2]宁波诺丁汉大学工程系,浙江宁波315100

出　　处：《现代化工》2012年第12期57-60,共4页Modern Chemical Industry

基　　金：浙江省自然科学基金资助项目(LQ12B06002);宁波市有机高分子材料与工程创新团队项目(2011B82002);王宽诚教育基金会资助项目;宁波工程学院学生立项科研项目

摘　　要：采用沉淀法制备了磁性活性炭,并用磁强计、比表面测定仪、XRD对其进行了表征。研究了磁性活性炭吸附去除水中甲基橙的吸附动力学、吸附热力学。结果表明:磁性活性炭对甲基橙吸附20 min后基本达到平衡,且与拟二级吸附动力学模型拟合较好;在25、40℃和55℃下符合Freundlich方程;吸附焓变、熵变和吉布斯自由能变均为负值,吸附为焓推动作用、自发且放热过程。Magnetic active carbon is synthesized by precipitation method and characterized by X-ray diffraction, nitrogen adsorption-desorption isotherm and vibrating sample magnetometer. Adsorption kinetics and thermodynamics of magnetic active carbon for methyl orange in aqueous solution are also investigated. The results show that adsorption can reach a balance after 20 minutes. The adsorption kinetics is identical with the pseudo-second-order model. The adsorption isotherms of 25℃ ,40℃ and 55℃ can be well fitted by the Freundlich equation. The negative values of thermodynamic parameters indicate that the adsorption is a spontaneous, exothermic and enthalpy promoting process.

关 键 词：磁性 活性炭 吸附 甲基橙 

分 类 号：X703.1[环境科学与工程—环境工程]