α-Fe_(2)O_(3)晶面调控及其非均相光芬顿催化降解甲基橙特性  

α-Fe_(2)O_(3) crystal plane control and its catalytic degradation properties in heterogeneous photo-Fenton for methyl orange

作　　者：梁建军[1] 陈书黎 周颖[1] LIANG Jianjun;CHEN Shuli;ZHOU Ying(College of Environment and Ecology,Chongqing University,Chongqing 400045,P.R.China)

机构地区：[1]重庆大学环境与生态学院,重庆400045

出　　处：《重庆大学学报》2023年第1期57-67,共11页Journal of Chongqing University

基　　金：国家重点研发计划资助项目(2019YFD1100101-06)。

摘　　要：针对非均相光芬顿中两相传质阻力导致催化性能较低的缺陷,采用水热法制备了α-Fe_(2)O_(3){110}/{113}晶面不同暴露比例的催化剂。采用X射线衍射分析(XRD)、透射电子显微镜(TEM/HRTEM)、傅里叶变换红外光谱(FTIR)以及紫外可见固体漫反射(UV-vis DRS)对催化剂进行表征分析,分别考察了H_(2)O_(2)浓度、催化剂投加量、甲基橙初始质量浓度以及初始pH对其催化降解甲基橙的影响,结果表明:FeCl_(3)·6H_(2)O浓度为33 mmol/L,摩尔比FeCl_(3)·6H_(2)O∶NaH_(2)PO_(4)∶NaF为1∶1∶15,180℃反应24 h所得α-Fe_(2)O_(3)催化性能最佳,在H_(2)O_(2)浓度为20 mmol/L,催化剂投加量为200 mg/L,甲基橙初始质量浓度为40 mg/L以及初始pH=5的条件下,对甲基橙的催化降解效果最佳,反应60 min去除率达97.83%;重复试验表明催化剂稳定性较好;H_(2)O_(2)消耗分析及自由基捕获实验结果表明,羟基自由基和光生空穴发挥关键催化降解作用,超氧自由基作用较小。To address the defect of low catalytic performance due to the two-phase mass transfer resistance in heterogeneous photo-Fenton,a hydrothermal method was used to prepare catalystsα-Fe_(2)O_(3)that exposed different ratios of crystal plane{110}/{113}.α-Fe_(2)O_(3)was characterized by XRD,TEM/HRTEM,FTIR and UV-vis DRS.The effects of H_(2)O_(2)concentration,catalyst dosage,initial concentration of methyl orange and initial pH onα-Fe_(2)O_(3)on methyl orange catalytic degradation were investigated.The results showed that theα-Fe_(2)O_(3)achieved the best catalytic performance when the concentration of precursor FeCl_(3)·6H_(2)O was 33 mmol/L,the dosage ratio of FeCl_(3)∶6H_(2)O∶NaH_(2)PO_(4):NaF was 1∶1∶15,and the reaction temperature was 180℃.Moreover,at the H_(2)O_(2)dosage of 20 mmol/L,catalyst dosage of 200 mg/L,initial methyl orange concentration of 40 mg/L and initial pH of 5,the removal of methyl orange was the best,reaching 97.83%in 60 min.The catalyst exhibited good stability after consecutive degradation cycles.The H_(2)O_(2)consumption analysis and free radical trapping experiment results showed that hydroxyl radicals and photo-generated holes played a key role in the catalytic degradation process,while superoxide radicals had less effect.

关 键 词：晶面调控 α-Fe_(2)O_(3) 非均相光芬顿 甲基橙 

分 类 号：X703[环境科学与工程—环境工程]