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Improved Oxygen Activation over a Carbon/Co3O4 Nanocomposite for Efficient Catalytic Oxidation of Formaldehyde at Room Temperature

文献类型：期刊论文

作者Li, Rong1,2,3; Huang, Yu1,2; Zhu, Dandan1,2; Ho, Wingkei4; Cao, Junji1,2; Lee, Shuncheng5
刊名ENVIRONMENTAL SCIENCE & TECHNOLOGY
出版日期2021-03-16
卷号55期号:6页码:4054-4063
ISSN号0013-936X
DOI10.1021/acs.est.1c00490
通讯作者Huang, Yu(huangyu@ieecas.cn)
英文摘要Oxygen activation is a key step in the catalytic oxidation of formaldehyde (HCHO) at room temperature. In this study, we synthesized a carbon/Co3O4 nanocomposite (C-Co3O4) as a solution to the insufficient capability of pristine Co3O4 (PCo3O4) to activate oxygen for the first time. Oxygen activation was improved via carbon preventing the agglomeration of Co3O4 nanoparticles, resulting in small particles (approximately 7.7 nm) and more exposed active sites (oxygen vacancies and Co3+). The removal efficiency of C-Co3O4 for 1 ppm of HCHO remained above 90%, whereas P-Co3O4 was rapidly deactivated. In static tests, the CO2 selectivity of C-Co3O4 was close to 100%, far exceeding that of P-Co3O4 (42%). Various microscopic analyses indicated the formation and interaction of a composite structure between the C and Co3O4 interface. The carbon composite caused a disorder on the surface lattice of Co3O4, constructing more oxygen vacancies than P-Co3O4. Consequently, the surface reducibility of C-Co3O4 was improved, as was its ability to continuously activate oxygen and H2O into reactive oxygen species (ROS). We speculate that accelerated production of ROS helped rapidly degrade intermediates such as dioxymethylene, formate, and carbonate into CO2. In contrast, carbonate accumulation on P-Co3O4 surfaces containing less ROS may have caused P-Co3O4 inactivation. Compared with noble nanoparticles, this study provides a transition metal-based nanocomposite for HCHO oxidation with high efficiency, high selectivity, and low cost, which is meaningful for indoor air purification.
资助项目National Key Research and Development Program of China, China[2016YFA0203000] ; Strategic Priority Research Program of the Chinese Academy of Sciences, China[XDA23010300] ; Strategic Priority Research Program of the Chinese Academy of Sciences, China[XDA23010000] ; National Science Foundation of China, China[51878644] ; National Science Foundation of China, China[41573138] ; Plan for National Youth Talents of the Organization Department of the Central Committee
WOS研究方向Engineering ; Environmental Sciences & Ecology
语种英语
出版者AMER CHEMICAL SOC
WOS记录号WOS:000636727200061
资助机构National Key Research and Development Program of China, China ; Strategic Priority Research Program of the Chinese Academy of Sciences, China ; National Science Foundation of China, China ; Plan for National Youth Talents of the Organization Department of the Central Committee
源URL[http://ir.ieecas.cn/handle/361006/16299]  
专题地球环境研究所_粉尘与环境研究室
第四纪科学与全球变化卓越创新中心
通讯作者Huang, Yu
作者单位1.Chinese Acad Sci, Inst Earth Environm, Key Lab Aerosol Chem & Phys, State Key Lab Loess & Quaternary Geol SKLLQG, Xian 710061, Peoples R China
2.CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Educ Univ Hong Kong, Dept Sci & Environm Studies, Hong Kong, Peoples R China
5.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Peoples R China
推荐引用方式
GB/T 7714		 Li, Rong,Huang, Yu,Zhu, Dandan,et al. Improved Oxygen Activation over a Carbon/Co3O4 Nanocomposite for Efficient Catalytic Oxidation of Formaldehyde at Room Temperature[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2021,55(6):4054-4063.
APA Li, Rong,Huang, Yu,Zhu, Dandan,Ho, Wingkei,Cao, Junji,&Lee, Shuncheng.(2021).Improved Oxygen Activation over a Carbon/Co3O4 Nanocomposite for Efficient Catalytic Oxidation of Formaldehyde at Room Temperature.ENVIRONMENTAL SCIENCE & TECHNOLOGY,55(6),4054-4063.
MLA Li, Rong,et al."Improved Oxygen Activation over a Carbon/Co3O4 Nanocomposite for Efficient Catalytic Oxidation of Formaldehyde at Room Temperature".ENVIRONMENTAL SCIENCE & TECHNOLOGY 55.6(2021):4054-4063.

入库方式： OAI收割

来源：地球环境研究所

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