FeMn-MOF/CN异质结光芬顿催化剂制备及性能研究

doi:10.19964/j.issn.1006-4990.2022-0146

摘要/Abstract

摘要：

通过一种简便的原位负载策略制备了铁锰双金属有机骨架/氮化碳异质结光芬顿催化剂FeMn-MOF/CN，并利用X射线衍射（XRD）、红外光谱（FT-IR）、扫描电镜（SEM）、光致发光（PL）光谱等测试手段对催化剂的组成、结构及光电化学性质进行了表征。以降解高浓度左氧氟沙星（LEV，100 mg/L）为模型反应评价了催化剂的光芬顿反应性能，并提出了可能的光芬顿反应机理。由于光催化和芬顿反应之间的协同作用，5%FeMn-MOF/CN（FeMn-MOF与CN的质量比为5%）异质结表现出优异的光芬顿反应性能，在40 min内对LEV的移除率达到98.8%。基于原位合成的策略，FeMn-MOF和CN之间形成了紧密的异质结界面，不但极大地提高了光生载流子的分离和传递效率，而且显著地促进了Fe（Ⅲ）/Fe（Ⅱ）和Mn（Ⅲ）/Mn（Ⅱ）的循环。该工作为高效光芬顿催化材料的设计和制备提供了新思路。

关键词: 光芬顿, 氮化碳, 双金属有机骨架, 异质结, 协同效应

Abstract:

The bimetal Fe，Mn-organic framework/carbon nitride heterojunction photo-Fenton catalysts（FeMn-MOF/CN） were prepared by a facile in-situ loading strategy，and the composition，structure and optoelectronic properties of the catalysts were characterized by X-ray diffraction（XRD），infrared spectroscopy（FT-IR），scanning electron microscopy（SEM），photoluminescence（PL） spectroscopy and etc.The photo-Fenton performance of the catalysts was evaluated by using the degradation of high concentration levofloxacin（LEV，100 mg/L） as model reaction，and the possible photo-Fenton reaction mechanism was proposed.Due to the synergistic effect between photocatalysis and Fenton reactions，5%FeMn-MOF/CN（mass ratio of FeMn-MoF/CN was 5%） exhi-bited excellent photo-Fenton performance，with the LEV removal efficiency of 98.8% within 40 min.An intimate heterojunction interface was formed between FeMn-MOF and CN via the in-situ loading strategy，which not only significantly improved the separation and transfer efficiency of photogenerated carriers，but also promoted the cycling of the Fe（Ⅲ）/Fe（Ⅱ）and Mn（Ⅲ）/Mn（Ⅱ）.This study provided a new idea for the design and preparation of efficient photo-Fenton catalytic materials.

Key words: photo-Fenton, carbon nitride, bimetallic MOF, heterojunction, synergistic effect

中图分类号:

O643.36

李向阳,刘紫威,李克艳,郭新闻. FeMn-MOF/CN异质结光芬顿催化剂制备及性能研究[J]. 无机盐工业, 2022, 54(12): 126-132.

LI Xiangyang,LIU Ziwei,LI Keyan,GUO Xinwen. Study on preparation and performance of FeMn-MOF/CN heterojunction photo-Fenton catalyst[J]. Inorganic Chemicals Industry, 2022, 54(12): 126-132.

图/表 6

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