The chemistry of gaseous benzene degradation using non-thermal plasma
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RESEARCH ARTICLE
The chemistry of gaseous benzene degradation using non-thermal plasma Chunyu Wang 1,2 & Ling Zhu 1 & Fei Zhao 1 & Danyun Xu 1 Received: 27 February 2020 / Accepted: 12 August 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this study, the abatement of benzene in a dielectric barrier discharge (DBD) reactor was studied. The efficiency was investigated in terms of benzene conversion and product formation. The composition of gas-liquid-solid three-phase product produced during degradation was observed by GC-MS. Under the optimal SED, the solid-phase product was analyzed by FT-IR, SEM, and EDS. The results suggested that the product were mainly benzonitriles, benzenedicarbonitrile, phenols, esters, and amides. The wt% of C in product decreased as SED increased, demonstrating that the high discharge voltage facilitated the conversion of VOCs to gaseous intermediate product and CO2. Possible degradation mechanism and pathways of benzene destruction in the DBD reactor were proposed. Keywords Benzene . Dielectric barrier discharge . Removal efficiency . Three-phase product . Mechanism
Introduction Air pollution has become a global issue that endangers the condition of the environment and poses serious health risks. Volatile organic compounds (VOCs) are a large group of chemical compounds that have a significant contribution to poor air quality and human health (Du et al. 2019; Hoseini et al. 2019; Kim et al. 2017; Sousa et al. 2013; Vandenbroucke et al. 2016). In recent years, considerable efforts have been made to develop efficient approaches to remove those harmful gases. The non-thermal plasma is promising technologies for VOCs purification due to its high efficiency at ambient temperature and atmospheric pressure (Aouadi et al. 2016; Hoseini et al. 2019; Karatum and Deshusses 2016; Mustafa et al. 2018; Schiavon et al. 2015; Yao et al. 2019). Dielectric
Responsible Editor: Philippe Garrigues * Ling Zhu [email protected] 1
Department of Environmental Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China
2
College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
barrier discharged (DBD), as an efficient method to produce NTP, has received extensive attention in recent years (Mustafa et al. 2018; Ragazzi et al. 2014; Wang et al. 2016). One of the factors limiting DBD development is that more byproduct is produced during plasma degradation. The majority of previous work focused on the optimization of different DBD parameters (Jiang et al. 2013; Mustafa et al. 2018). The discharge product of VOCs is another focus studies in recent years (Karatum and Deshusses 2016; Lee et al. 2004; Li et al. 2019; Sang et al. 2019; Wang et al. 2017; Zhou et al. 2019). However, there are few comprehensive studies on gas-liquid-solid three-phase generated during degradation process. Furthermore, there are few comparative studies on degradation products under different specific energy density (SED) conditions, a
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