학술논문
高活性Cu-MnO2类氧化物纳米酶降解罗丹明B / Rhodamine B degradation by highly active Cu-MnO2 oxidase-like nanoenzyme
Document Type
Academic Journal
Author
谢碧梅; 郑燕宁; 王迎波; 孙建华; 杨崎峰; 廖丹葵; XIE Bimei; ZHENG Yanning; WANG Yingbo; SUN Jianhua; YANG Qifeng; LIAO Dankui
Source
精细化工 / Fine Chemicals. 40(12):2752-2761
Subject
Language
Chinese
ISSN
1003-5214
Abstract
采用一步水热法制备了高活性铜掺杂二氧化锰(Cu-MnO2)类氧化物纳米酶(简称为类氧化物酶),采用XRD、SEM、EDS、N2 吸附-脱附、XPS对其进行了表征,探究了Cu-MnO2 催化降解罗丹明B(RhB)的效果.结果表明,铜掺杂后 Cu-MnO2 产生了协同效应,增强了 Cu-MnO2 的类氧化物酶催化活性,当溶液pH=3.0、RhB初始质量浓度为 50 mg/L、Cu-MnO2-10%(10%为CuCl2·2H2O物质的量占KMnO4 物质的量的百分数)用量为 0.01 g时,30℃下,30 min内可完全降解RhB,并且催化剂使用 5 次后RhB降解率仍达 75%.此外,对环丙沙星、氧氟沙星、四环素和对苯二酚难降解的污染物的降解率分别为 88.86%、90.47%、92.62%和 90.99%.Cu-MnO2 类氧化物酶催化降解RhB的机理研究表明,富含氧空位的Cu-MnO2中存在丰富的空穴,有利于吸附和催化溶解氧生成大量的单线态氧(1O2)和少量的超氧自由基(Oγ2-)等活性氧物种,可用于快速降解有机污染物.
Highly active copper-doped manganese dioxide(Cu-MnO2)oxidase-like nanozyme(abbreviated as oxidase-like enzyme)was prepared by one-step hydrothermal method and characterized by XRD,SEM,EDS,N2 adsorption-desorption and XPS.And its catalytic performance on Rhodamine B(RhB)degradation was further investigated.The results showed that the improved catalytic activity of Cu-MnO2 was attributed to the synergistic effect of MnO2 and doped copper.RhB could be fully degraded within 30 min at 30℃under the conditions of solution pH 3.0,initial RhB mass concentration 50 mg/L,and Cu-MnO2-10%(10%is the percentage of amount of substance of CuCl2·2H2O and KMnO4)dosage 0.01 g,while the degradation rate of RhB was still maintained 75%even when the catalyst was recycled 5 times.In addition,the degradation rates of ciprofloxacin,ofloxacin,tetracycline,and hydroquinone were 88.86%,90.47%,92.62%and 90.99%,respectively.The mechanism study of RhB degradation catalyzed by Cu-MnO2 oxidase-like enzyme revealed that there were abundant holes in oxygen vacancy rich Cu-MnO2,which was beneficial for adsorbing and catalyzing dissolved oxygen to produce a large amount of singlet oxygen(1O2)and a small number of superoxide radicals(Oγ2-)and other reactive oxygen species for the rapid degradation of organic pollutants.
Highly active copper-doped manganese dioxide(Cu-MnO2)oxidase-like nanozyme(abbreviated as oxidase-like enzyme)was prepared by one-step hydrothermal method and characterized by XRD,SEM,EDS,N2 adsorption-desorption and XPS.And its catalytic performance on Rhodamine B(RhB)degradation was further investigated.The results showed that the improved catalytic activity of Cu-MnO2 was attributed to the synergistic effect of MnO2 and doped copper.RhB could be fully degraded within 30 min at 30℃under the conditions of solution pH 3.0,initial RhB mass concentration 50 mg/L,and Cu-MnO2-10%(10%is the percentage of amount of substance of CuCl2·2H2O and KMnO4)dosage 0.01 g,while the degradation rate of RhB was still maintained 75%even when the catalyst was recycled 5 times.In addition,the degradation rates of ciprofloxacin,ofloxacin,tetracycline,and hydroquinone were 88.86%,90.47%,92.62%and 90.99%,respectively.The mechanism study of RhB degradation catalyzed by Cu-MnO2 oxidase-like enzyme revealed that there were abundant holes in oxygen vacancy rich Cu-MnO2,which was beneficial for adsorbing and catalyzing dissolved oxygen to produce a large amount of singlet oxygen(1O2)and a small number of superoxide radicals(Oγ2-)and other reactive oxygen species for the rapid degradation of organic pollutants.