磁性纳米复合物Mn_(0.6)Zn_(0.4)Fe_(2)O_(4)@SiO_(2)催化过氧化氢降解水中孔雀石绿  

Degradation of malachite green in water with H_(2)O_(2) catalyzed by magnetic nanocomposite Mn_(0.6)Zn_(0.4)Fe_(2)O_(4)@SiO_(2)

作　　者：方永辉 余静[1] 刘沂楠 李世杰 徐冬莹 郑婉懿 FANG Yong-hui;YU Jing;LIU Yi-nan;LI Shi-jie;XU Dong-ying;ZHENG Wan-yi(College of Resources and Environment,Chengdu University of Information Technology,Chengdu 610225,China)

机构地区：[1]成都信息工程大学资源环境学院,四川成都610225

出　　处：《化学研究与应用》2025年第2期419-428,共10页Chemical Research and Application

摘　　要：为制备易固液分离的稳定性好的高效非均相类Fenton催化剂活化H_(2)O_(2)降解水中孔雀石绿(MG),本文以Mn0.6Zn0.4Fe2O4磁性纳米颗粒(Fe-MNPs)为磁核,制备得到硅包覆的磁性纳米复合物Mn_(0.6)Zn_(0.4)Fe_(2)O_(4)@SiO_(2)(Si-Fe-MNCs),利用透射电镜、X射线光电子能谱和振动样品磁强计等对Si-Fe-MNCs进行了表征,研究了Si-Fe-MNCs催化活化H_(2)O_(2)去除MG的效能和主要影响因素,确定了Si-Fe-MNCs+H_(2)O_(2)体系中的主要的活性氧化物及Si-Fe-MNCs的催化活性位点,推测了催化机制。结果表明,Si-Fe-MNCs催化活化H_(2)O_(2)生成的主要活性氧化物为HO·,降解120 min,MG去除率可达97.6%,该过程可用一级反应动力学描述,表观活化能为22.31 kJ·mol^(-1);Si-Fe-MNCs存在空穴氧,对电子转移具有强化作用,Fe和Mn为催化活性组分。Si-Fe-MNCs催化效率高、具有良好的稳定性与循环使用性能,在难降解有机污染物去除方面具有广阔的应用前景。In order to prepare high-efficiency heterogeneous magnetic catalysts with both easy solid-liquid separation and good stability for activating H_(2)O_(2)to depredate malachite green(MG)in water,silicon-coated magnetic nanocomposites Mn_(0.6)Zn_(0.4)Fe_(2)O_(4)@SiO_(2)(Si-Fe-MNCs)were prepared by using Mn_(0.6)Zn_(0.4)Fe_(2)O_(4)magnetic nanoparticles(Fe-MNPs)as magnetic nuclei.Si-Fe-MNCs were characterized by transmission electron microscopy,X-ray photoelectron spectroscopy and vibrating sample magnetometer.The removal efficiency of MG using H_(2)O_(2)activated by Si-Fe-MNCs and main influencing factors were studied.The catalytic active sites of Si-Fe-MNCs in the Si-Fe-MNCs+H_(2)O_(2)system and the main reactive oxides were determined,and the catalytic mechanism was speculated.The results showed that the main reactive oxide generated by Si-Fe-MNCs catalyzed activation of H_(2)O_(2)was HO·,MG removal efficiency could reach 97.6%after degradation for 120 min.The process could be described by first-order reaction kinetics,and the apparent activation energy was 22.31 kJ·mol^(-1).The oxygen vacancy in Si-Fe-MNCs was favorable for the electron transfer,and the elements of Fe and Mn were the catalytic active components.Si-Fe-MNCs had high catalytic efficiency,good stability and recycling performance,which has a very broad application prospects in the removal of refractory organic pollutants.

关 键 词：磁性纳米复合物 非均相 类FENTON 降解 孔雀石绿 

分 类 号：O614.7[理学—无机化学]