Degradation of 2,4-dichlorophenol by cathodic microarc plasma electrolysis: characteristics and mechanisms
| Autor: | Wenbin Xue, Ruihong Liu, Xiaoyue Jin, Jiahao Yu, Jiancheng Du, Yifan Zhang, Guijun Liu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
0208 environmental biotechnology 02 engineering and technology 010501 environmental sciences Wastewater 01 natural sciences Electrolysis law.invention Cathodic protection chemistry.chemical_compound Phenols law Environmental Chemistry Waste Management and Disposal 0105 earth and related environmental sciences Water Science and Technology 2 4-Dichlorophenol General Medicine Plasma 020801 environmental engineering Chemical engineering chemistry Degradation (geology) Water Pollutants Chemical Chlorophenols |
| Zdroj: | Environmental technology. 43(4) |
| ISSN: | 1479-487X |
| Popis: | In this work, we used cathodic microarc plasma electrolysis (CMPE) to degrade 2,4-dichlorophenol (2,4-DCP) in simulated wastewater. By investigating and comparing the removal efficiencies and chemical oxygen demand (COD) during the degradation process, higher bath voltage and alkaline condition were considered as more suitable for the 2,4-DCP decomposition. Higher initial 2,4-DCP concentration was attributed to the increase in the utilisation of the energy input. The plasma characteristics during CMPE were studied by optical emission spectroscopy (OES). It was found that the 2,4-DCP directly participated in the plasma discharge process. Furthermore, by studying the evolution of intermediate products at different experimental parameters, it was found that the existence of Cl- played an important role in the opening of benzene ring, which activated the ortho-substitutions of hydroxyl, meanwhile accelerated the p-substitutions. The instantaneous high temperature and high pressure and the Cl- that were generated and driven by cathodic plasma made the decomposition of 2,4-DCP much quicker. |
| Databáze: | OpenAIRE |
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