柠檬酸辅助铁-锆催化剂增强光芬顿降解罗丹明B
Improvement of Photo-Fenton Activity with the Assistance of Citric Acid on the FeOOH-ZrO2 System for the Degradation of RhB
张博 1黎晓燕 2钟乐恒 2张扬 2陈冬冬 1李湘1
作者信息
- 1. 肇庆学院,广东 肇庆 526061;广东省环境健康与资源利用重点实验室,广东 肇庆 526061
- 2. 肇庆学院,广东 肇庆 526061
- 折叠
摘要
本文采用水热-沉淀法制备FeOOH-ZrO2催化剂,采用XRD对催化剂的物相进行了分析,并利用SEM-EDS对催化剂的形貌与组成进行了表征.以罗丹明B(RhB)为目标污染物,在可见光辐照下,构建了柠檬酸(CA)辅助FeOOH/ZrO2增强光芬顿体系用于降解RhB,探究了工艺条件对RhB降解率的影响,在优选的工艺条件:H2O2=1 mM,初始pH=3.0,FeOOH-ZrO2=1 g/L,CA=1 mM,RhB的降解率为96.69%.开展了循环实验,循环5 次后,RhB的降解率仍保持在90%以上,并采用自由基捕获实验、荧光实验研究了CA辅助FeOOH-ZrO2增强光芬顿体系的机理.ZrO2与CA均能促进反应体系对RhB的降解.
Abstract
In this study,FeOOH-ZrO2 catalysts were synthesized by the hydrothermal-precipitation method.The crystal structure of catalysts was analyzed by XRD,and the morphology and composition of the catalysts were characterized by SEM-EDS.With Rhodamine B(RhB)as the target pollutant,the citric acid-assisted FeOOH-ZrO2 system was established to improve the photo-Fenton for eliminating the RhB under visible light irradiation.The effects of process conditions on the RhB degradation were investigated,and the degradation rate of RhB reached 96.69%under the optimal process conditions,where H2O2=1 mM,initial pH=3.0,FeOOH-ZrO2=1 g/L,CA=1 mM.Furthermore,cyclic experiments were conducted,and the degradation rate of RhB remained above 90%after 5 cycles.The mechanism of the citric acid-assisted FeOOH-ZrO2 enhancement of the photo-Fenton system was explored through free radical capture and fluorescence experiments.Both ZrO2 and citric acid were found to promote the degradation of RhB in the reaction system.
关键词
FeOOH-ZrO2/柠檬酸/光芬顿/羟基自由基/罗丹明BKey words
FeOOH-ZrO2/citric acid/photo-Fenton/·OH/RhB引用本文复制引用
出版年
2024
NETL
NSTL
万方数据