title: Research on dye wastewater decoloration by pulse discharge plasma combined with charcoal derived from spent tea leaves.
abstract: Pulsed discharge plasma (PDP) combined with charcoal (PDP-charcoal) was employed to treat dye wastewater, with methyl orange (MO) as the model pollutant. The charcoal was prepared using spent tea leaves and was characterized by scanning electron microscopy, Fourier-transform infrared spectroscopy, and Boehm titration to investigate the adsorption and catalytic characteristics before and after adsorption and PDP treatment. The prepared charcoal exhibited a high MO adsorption capacity, and the adsorption process followed the pseudo-second-order kinetic model and the Freundlich model. The MO decoloration efficiency reached 69.8 % within 7.5 min of treatment in the PDP-charcoal system, whereas values of 29.2 and 25.9 % were achieved in individual PDP and charcoal systems, respectively. The addition of n-butanol and H2PO4 (-) presented inhibitive effects on MO decoloration in the PDP system. However, these effects were much weaker in the PDP-charcoal system. In addition, the effects of charcoal on O3 and H2O2 formation were evaluated, and the results showed that both the O3 and H2O2 concentrations decreased in the presence of charcoal. The MO decomposition intermediates were analyzed using UV-Vis spectrometry and GC-MS. 1,4-Benzoquinone, 4-nitrophenol, 4-hydroxyaniline, and N,N'-dimethylaniline were detected. A possible pathway for MO decomposition in this system was proposed.
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province, 712100, People's Republic of China. wangtiecheng2008@126.com.|Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, 712100, People's Republic of China. wangtiecheng2008@126.com.
authors.forename: Tiecheng
authors.initials: T
authors.lastname: Wang
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province, 712100, People's Republic of China.|Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, 712100, People's Republic of China.
authors.forename: Guangzhou
authors.initials: G
authors.lastname: Qu
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province, 712100, People's Republic of China.|Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, 712100, People's Republic of China.
authors.forename: Shuzhao
authors.initials: S
authors.lastname: Pei
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province, 712100, People's Republic of China.|Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, 712100, People's Republic of China.
authors.forename: Dongli
authors.initials: D
authors.lastname: Liang
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province, 712100, People's Republic of China.|Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, 712100, People's Republic of China.
authors.forename: Shibin
authors.initials: S
authors.lastname: Hu
mesh_terms: D000327:Adsorption; D000627:Aminophenols / Q000737:chemistry; D001391:Azo Compounds / Q000737:chemistry*; D016227:Benzoquinones / Q000737:chemistry; D028241:Camellia sinensis; D002606:Charcoal / Q000737:chemistry*; D003116:Color; D004396:Coloring Agents / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D009596:Nitrophenols / Q000737:chemistry; D010126:Ozone / Q000737:chemistry; D018515:Plant Leaves / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D000627:Aminophenols; D001391:Azo Compounds; D016227:Benzoquinones; D002606:Charcoal; D004396:Coloring Agents; D006861:Hydrogen Peroxide; D009596:Nitrophenols; D010126:Ozone; D062065:Wastewater; D014874:Water Pollutants, Chemical; C004532:quinone; C100258:methyl orange; C026729:4-aminophenol; C024836:4-nitrophenol
keywords: Charcoal; Decoloration; Methyl orange; Pulsed discharge plasma; Spent tea leaves