Decomposition of Toluene with a Combined Plasma Photolysis (CPP) Reactor: Influence of UV Irradiation and Byproduct Anal
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Decomposition of Toluene with a Combined Plasma Photolysis (CPP) Reactor: Influence of UV Irradiation and Byproduct Analysis Jiayao Chen1 · Jianqi Liu2 · Xin Liu2 · Xiaoyi Xu1 · Fangchuan Zhong1,3 Received: 3 January 2020 / Accepted: 14 June 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract A combined plasma photolysis (CPP) reactor was used to study the effect of UV irradiation on the removal efficiency and byproducts of toluene decomposition. The influence of UV irradiation length on the removal rate and byproducts were compared. The results show that the toluene removal is obviously improved in the CPP reactor. The removal rate is enhanced with the increase of the UV irradiation length. The increase of removal efficiency is 7.94% and 19.1% under the UV irradiation with 5 cm and 15 cm length, respectively. UV also reduces the production of ozone significantly. It is interesting to find that the effect of UV on the carbon balance is not always increased as expected, but is related to the inlet toluene initial concentration. When the inlet toluene concentration is 300 ppm or 400 ppm, the carbon balance is enhanced by UV. When the inlet concentration is lower, in 60 ppm and 100 ppm, UV no longer plays a positive role. However, UV can change the trend of carbon balance at low initial concentrations and makes it positively related to specific input energy (SIE), which is contrary to the cases without UV. Keywords VOCs degradation · CPP · UV · Carbon balance
Introduction Volatile organic compounds (VOCs), which are emitted from various processes of production and use, are considered to be one of the main sources of gaseous pollutants. The emissions of VOCs directly cause the air pollution or obliquely contribute to the formation of particulate matter (such as PM 2.5) and photochemical smog in the atmosphere [1–3]. In addition, it has been confirmed that VOCs could cause chronic harmful effect on heart,
* Fangchuan Zhong [email protected] 1
College of Science, Donghua University, Shanghai 201620, People’s Republic of China
2
College of Environmental Science and Engineering, Donghua University, Shanghai 201620, People’s Republic of China
3
Magnetic Confinement Fusion Research Centre, Ministry of Education, Shanghai, People’s Republic of China
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Plasma Chemistry and Plasma Processing
lungs, nervous system and respiratory system which leads to diseases, even death [4, 5]. To solve these problems, it is urgent to develop new or improve existed treatment technologies to degradation and control of VOCs emissions. Non-thermal plasma (NTP) has been studied for decades as an efficient method for treatment of VOCs. Dielectric barrier discharge (DBD), as we know, is an important method to generate plasma in atmospheric pressure and room temperature. The most common DBD reactor types used for VOCs treatment are the coaxial cylindrical or the planar configuration (referred as the volume discharge DBD, VDBD) [6–8] owing to their easy realization and the uniformit
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