Boosting hydrogen peroxide accumulation by a novel air-breathing gas diffusion electrode in electro-Fenton system

IF 20.2 1区化学 Q1 CHEMISTRY, PHYSICAL

Applied Catalysis B: Environmental Pub Date : 2022-11-05 DOI:10.1016/j.apcatb.2022.121617

Yanshi Zheng , Junguo He , Shan Qiu , Dehai Yu , Yingshi Zhu , Heliang Pang , Jie Zhang

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引用次数: 19

Abstract

Electro-Fenton (EF) is a promising electrochemical technology in degrading recalcitrant organic pollutants. However, the technology faces problems of high energy consumption, low cathodic oxygen transfer rate and low H₂O₂ production efficiency. Therefore, a novel air-breathing gas diffusion electrode (GDE) with multiform hydrophobic layers was prepared by a facile method. The novel GDE allows the air to diffuse to the triphase interface spontaneously, eliminating the cost of aeration. Also, the multiform hydrophobic layers can greatly improve the oxygen transfer rate and expand the triphase interfaces in the GDE, resulting in a high H₂O₂ accumulation of 44.30 mg L⁻¹ cm⁻² h⁻¹ without aeration, which was 18 times higher than that of the virgin cathode. A 100% degradation efficiency of sulfadiazine (SDZ) was achieved with the fabricated GDE in 10 min in EF system. Moreover, theoretical calculations were performed for accurately elucidating the SDZ degradation mechanism and pathway.

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一种新型吸气式气体扩散电极在电- fenton系统中促进过氧化氢积累

电fenton (Electro-Fenton, EF)是一种很有前途的降解难降解有机污染物的电化学技术。但该技术存在能耗高、阴极氧传递速率低、H2O2产率低等问题。为此，采用简易方法制备了具有多种疏水层的新型空气呼吸气体扩散电极(GDE)。新型GDE使空气自发扩散到三相界面，消除了曝气成本。多相疏水层的形成大大提高了氧传递速率，扩大了GDE的三相界面，在不曝气的情况下H2O2的积累量高达44.30 mg L−1 cm−2 h−1，是未曝气阴极的18倍。制备的GDE在10 min内对磺胺嘧啶(SDZ)的降解率达到100%。通过理论计算，准确地阐明了SDZ的降解机理和途径。

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来源期刊

Applied Catalysis B: Environmental 环境科学-工程：化工

CiteScore

38.60

自引率

6.30%

发文量

1117

审稿时长

24 days

期刊介绍： Applied Catalysis B: Environment and Energy (formerly Applied Catalysis B: Environmental) is a journal that focuses on the transition towards cleaner and more sustainable energy sources. The journal's publications cover a wide range of topics, including: 1.Catalytic elimination of environmental pollutants such as nitrogen oxides, carbon monoxide, sulfur compounds, chlorinated and other organic compounds, and soot emitted from stationary or mobile sources. 2.Basic understanding of catalysts used in environmental pollution abatement, particularly in industrial processes. 3.All aspects of preparation, characterization, activation, deactivation, and regeneration of novel and commercially applicable environmental catalysts. 4.New catalytic routes and processes for the production of clean energy, such as hydrogen generation via catalytic fuel processing, and new catalysts and electrocatalysts for fuel cells. 5.Catalytic reactions that convert wastes into useful products. 6.Clean manufacturing techniques that replace toxic chemicals with environmentally friendly catalysts. 7.Scientific aspects of photocatalytic processes and a basic understanding of photocatalysts as applied to environmental problems. 8.New catalytic combustion technologies and catalysts. 9.New catalytic non-enzymatic transformations of biomass components. The journal is abstracted and indexed in API Abstracts, Research Alert, Chemical Abstracts, Web of Science, Theoretical Chemical Engineering Abstracts, Engineering, Technology & Applied Sciences, and others.