Peroxymonosulfate activation based on Co9S8@N-C:A new strategy for highly efficient hydrogen production and synchronous formaldehyde removal in wastewater

Caiyan Gao; Xuezhen Feng; Lian Yi; Xiaoyong Wu; Renji Zheng; Gaoke Zhang; Yubiao Li

2022

材料科学技术（英文版）   Impact Factor & Quartile

1005-0302

Formaldehyde(FA),as an important chemical raw material,has been widely used in many fields.How-ever,the discharge of a large amount of FA-containing wastewater poses a serious threat to the environ-ment and human health.Recently,the in-situ hydrogen energy release technology of hydrogen-containing stable liquid has been extensively explored due to its safe storage.Exploring a robust method to achieve FA removal and synchronous in-situ hydrogen release from FA containing wastewater is of great signif-icant for environmental protection and energy crisis alleviation.Here,we have innovatively introduced peroxymonosulfate(PMS)activation technology into FA removal and hydrogen production simultaneously.The composite of nitrogen doped carbon coating Co9S8 nanotubes(Co9S8@N-C)is employed as a proof of concept for FA decomposition and simultaneously hydrogen production based on PMS activation system.As expected,the Co9S8@N-C/PMS system presents much superior hydrogen production efficiency and satisfactory FA removal rate towards FA wastewater than those of common catalysis,photocatalysis and Fenton reaction in the basic condition in a wide range of FA concentration.The hydrogen yield reaches a value as high as 471 μmol within 60 min,corresponding to a FA degradation rate of 30％with an ini-tial FA concentration of 0.722 mol L-1.Characterizations and density functional theory(DFT)calculations suggest that the free radical process dominated by superoxide radical(O2·-)and nonradical process dom-inated by singlet oxygen(1O2),which are induced by Co9S8@N-C/PMS system,are responsible for highly efficient hydrogen production via FA degradation.These generated O2·-and 1O2 can extract H from FA to form OOH intermediate,which can further combine with the H from water to produce hydrogen.This study provides an applicable technique for environmental purification and new energy development based on FA containing wastewater.

English

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MATERIALS SCIENCE

WanFang

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1.School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China
2.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China

Caiyan Gao,Xuezhen Feng,Lian Yi,et al. Peroxymonosulfate activation based on Co9S8@N-C:A new strategy for highly efficient hydrogen production and synchronous formaldehyde removal in wastewater[J]. 材料科学技术（英文版）,2022,127(32):256-267.

Caiyan Gao.,Xuezhen Feng.,Lian Yi.,Xiaoyong Wu.,Renji Zheng.,...&Yubiao Li.(2022).Peroxymonosulfate activation based on Co9S8@N-C:A new strategy for highly efficient hydrogen production and synchronous formaldehyde removal in wastewater.材料科学技术（英文版）,127(32),256-267.

Caiyan Gao,et al."Peroxymonosulfate activation based on Co9S8@N-C:A new strategy for highly efficient hydrogen production and synchronous formaldehyde removal in wastewater".材料科学技术（英文版） 127.32(2022):256-267.