CoFe_2O_4纳米磁性粒子的制备及降解染料的研究  

Preparation of Magnetic Nanoparticles CoFe_2O_4 and Stusy on Dyes Degradation

作　　者：许春波[1] 姚玉元[1] 吕汪洋[1] 黄三庆[1] 

机构地区：[1]浙江理工大学纺织纤维材料与加工技术国家地方联合工程实验室,杭州310018

出　　处：《浙江理工大学学报（自然科学版）》2017年第1期1-7,共7页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：国家自然科学基金重点项目(51133006);国家自然科学基金项目(51103133;51302246);浙江省自然科学基金项目(LY14E030015)

摘　　要：开发高效活化过一硫酸氢钾(PMS)的环保催化剂是环境催化领域一个崭新而极具挑战性的研究课题。本文采用水热法制备具有催化和磁性分离双重特性的纳米粒子CoFe_2O_4。通过XRD、XPS、VSM等对其进行表征,以染料亚甲基蓝(MB)为探针化合物,以PMS为氧化剂,考察CoFe_2O_4的催化性能。结果表明,10min内CoFe_2O_4对MB的去除率高达98%,并且经磁性分离重复使用6次以后,其催化活性基本不变,表明CoFe_2O_4具有良好的重复使用性,而且CoFe_2O_4还能够催化降解酸性橙7、弱酸性桃红、活性艳橙、碱性绿1和活性艳红等多种染料。采用抗坏血酸为自由基捕获剂,结合电子顺磁共振波谱证实了CoFe_2O_4/PMS催化体系的氧化活性种主要为SO·-4与·OH,并推测了其催化反应机理。The development of environmentally friendly catalyst to effectively activate peroxymonosulfate （PMS） is a new and challenging research project in the field of environmental catalysis. In this study, CoFe2O4, which has catalytic property and magnetic separation, was prepared by hydrothermal method, and characterized by X-ray diffraction, XPS and VSM. The catalytic activity of CoFe2O4 was investigated by using methylene blue （MB） as the probe compound and PMS as the oxidant. The results showed that more than 98% MB was eliminated within 10 min, and the catalytic activity remained unchanged after magnetic separation was used 6 times. This indicates that CoFe204 owns good reusability. Besides, CoFe2O4 can catalytically degrade multiple dyes including Acid Orange7 （AO7）, Weak Acid Pink （WAK-BS）, Reactive Brilliant Orange （RR X-3B）, Basic Greenl （BG1） and Reactive Red （RR M-3BE）, etc. Ascorbic acid as the radical scavenger was combined with electron paramagnetic resonances （EPR） spectroscopy to identify the active species of CoFe2O4/PMS catalytic system, i.e. SO4· - and · OH. Moreover, the mechanism of catalytic reaction was speculated.

关 键 词：COFE2O4 催化氧化 PMS活化 染料 

分 类 号：X791[环境科学与工程—环境工程]