L-抗坏血酸对α-FeOOH类Fenton降解罗丹明B的增效作用  

Synergistic effect of L-ascorbic acid on degradation of Rhodamine B byα-FeOOH Fenton-like

作　　者：黄仕元 吴兴良 袁瀚钦 王国华 董雯[1] HUANG Shi-yuan;WUXing-liang;YUAN Han-qin;WANG Guo-hua;DONG Wen(School of Civil Engineering,University of South China,Hengyang 421001,China;Hunan Provincial Key Laboratory of Pollution Control and Resources Technology,University of South China,Hengyang 421001,China)

机构地区：[1]南华大学土木工程学院,湖南衡阳421001 [2]南华大学污染控制与资源化技术湖南省重点实验室,湖南衡阳421001

出　　处：《应用化工》2023年第10期2804-2811,共8页Applied Chemical Industry

基　　金：国家自然科学基金(51904155)。

摘　　要：以L-抗坏血酸(AA)作还原物质,采用沉淀法制备了针铁矿(α-FeOOH),用以作为类芬顿的催化剂降解染料罗丹明B(RhB),考察不同体系和不同因素对RhB降解效果的影响,并探究α-FeOOH重复利用的效果。结果表明,α-FeOOH/H_(2)O_(2)/AA体系在α-FeOOH投加量1.2 g/L、H_(2)O_(2)浓度为10 mmol/L、AA浓度4 mmol/L、RhB浓度20 mg/L、溶液pH值为5.5的条件下反应60 min后,RhB的降解率达95.55%,重复利用5次后,对RhB仍有76.62%的降解率。其降解过程符合准一级反应动力学模型,最大反应速率常数为0.0459 min^(-1)。·O_(2)^(-),·OH和1O_(2)是反应体系产生的活性氧物种,其中·O_(2)^(-)在RhB的降解中起着主要作用。Selecting L-ascorbic acid(AA)as the reducing material,the goethite(α-FeOOH)catalytic material was prepared by precipitation method,which was used as a Fenton-like catalyst to degrade the dye Rhodamine B(RhB).The effects of different removal systems and factors on the degradation of RhB were investigated,and the reuse ofα-FeOOH catalyst was explored.The results show that theα-FeOOH/H_(2)O_(2)/AA system hasα-FeOOH dosage of 1.2 g/L,H_(2)O_(2) concentration of 10 mmol/L,and AA concentration of 4 mmol/L,RhB concentration of 20 mg/L,pH 5.5 for 60 min,the degradation rate of RhB reached 95.55%.The degradation rate of 76.62%for RhB after being used for 5 times and the degradation process conformed to the pseudo-first-order kinetic model.The maximum reaction rate constant was 0.0459 min^(-1).The results of quenching experiment and ESR detection showed that·O_(2)^(-),·OH and 1O_(2) were reactive oxygen species produced in the reaction system,and·O_(2)^(-) played a major role in the degradation of RhB.

关 键 词：L-抗坏血酸 针铁矿 类芬顿 高级氧化 罗丹明B 

分 类 号：TQ610.9[化学工程—精细化工] X703[环境科学与工程—环境工程] O643.32[理学—物理化学]