Fe3O4纳米吸附剂的制备及其去除水中Cr(Ⅵ）的吸附机理研究

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吕双， 杨雪， 吕洁， 高洪涛*

（青岛科技大学 无机合成与应用化学重点实验室，山东 青岛266042）

摘要： 以FeCl3·6H2O和醋酸钠为原料，采用水热法制备Fe3O4纳米吸附剂，将其用于水中重金属Cr(Ⅵ)的吸附去除。纳米Fe3O4可有效去除Cr(Ⅵ)，反应2 h后就达到吸附平衡，其最大平衡吸附量为6085 mg·g-1。对其吸附机理研究表明：Cr(Ⅵ)在Fe3O4表面的吸附符合Freundlich等温线模型，吸附活化能为4373 kJ·mol-1，表明为化学吸附，其吸附过程包括表面扩散、颗粒内部扩散和吸附平衡扩散3个阶段，其动力学符合准二级反应动力学。利用Fe3O4纳米粒子吸附除去水中重金属离子在实际工业中是一种行之有效的方法。

关键词： 纳米Fe3O4;水热法； 吸附剂； 吸附机理

中图分类号：TM 277文献标志码：A

Preparation of NanoFe₃O₄Adsorbent and the Mechanism of Cr (Ⅵ) Removal in Wastewater

LYU Shuang, YANG Xue, LYU Jie, GAO Hongtao

(Laboratory of Inorganic Synthesis and Applied Chemistry, Qingdao University of Science and Technology, Qingdao 266042, China)

Abstract: The excellent Fe3O4 adsorbent was fabricated via a facile hydrothermal process, using FeCl3·6H2O and sodium acetate as reaction source, which was used to remove heavy metals, such as Cr(Ⅵ), in wastewater. The Fe3O4 nanoparticles can effectively remove the Cr(Ⅵ) and the final adsorption equilibrium was achieved within approximately 2 h after Fe3O4 was added into the solution. The equilibrium capacity was estimated to be 6085 mg·g-1 in a typical sorption reaction. The investigation on the mechanism of sorption reaction indicated that the Freundlich isotherm could fit the equilibrium data for adsorption of Cr(Ⅵ) on the surface of Fe3O4. The activation energy of adsorption was calculated to be 4373 kJ·mol-1, which indicated that the type of adsorption was mainly chemical. There included three stages, including the surface diffusion, the intraparticle diffusion and the final equilibrium in the adsorption process. The adsorption was in line with the pseudosecondorder kinetic. The experimental results demonstrated that Fe3O4 exhibited excellent adsorption performance in the removal of Cr(Ⅵ), which indicated Fe3O4 might be used as adsorbent to remove heavy metal in swage in practical industry.

Key words:  nanoFe3O4; hydrothermal method; adsorbent; adsorption mechanism

 收稿日期：20150502

基金项目： 国家自然科学基金项目(41340037,41573103)；山东省科技发展计划项目(2013G0021701,2014GGH217001).

作者简介： 吕双（1990—），女，硕士研究生.*通信联系人.

 文章编号：16726987（2016）04041204； DOI： 10.16351/j.16726987.2016.04.012