N-doped biochar-catalyzed dechlorination of carbon tetrachloride in sulfide-containing aqueous solutions: Performances, mechanisms and pathways
Nitrogen-doped biochar (N-BC) has been widely concerned in the field of environmental protection. This study verified the alfalfa-based N-BC pyrolyzed at different temperatures is able to catalyze carbon tetrachloride (CT) dechlorination in sulfide-containing aqueous solutions under normal environmental pH range (6.3 ∼ 8.3) effectively, with Cl, trichloromethane (CF), CS and HCO as predominated products. Higher pyrolysis temperature resulted in larger specific surface area, more pores and better catalytic capacity. The N-BC had a good tolerance to water matrix in catalyzing CT dechlorination by sulfide, while the higher pH value or higher dosage of sulfide or N-BC was beneficial to catalytic CT dechlorination. The generation of CS was the major CT dechlorination pathway, attributing to the SN nucleophilic substitution by newborn C-SS- structure generating from the interaction between pyridine-N and sulfide. Besides, generation of CF via hydrogenolysis process was the minor CT dechlorination pathway, owing to the enhanced electron transfer by pyrrole-N, graphitic-N and quinones on surface of N-BC. It was the first time that N-BC was found to be effective in catalyzing the hydrogenolysis process of CT dechlorination. This study emphasized the importance of N-BC in restoring chlorinated hydrocarbons polluted aquatic environment containing sulfide, such as sediments.
NI Journal Papers
National Natural Science Foundation of China
|WOS Research Area|
Engineering ; Environmental Sciences & Ecology ; Water Resources
Engineering, Environmental ; Environmental Sciences ; Water Resources
|WOS Accession No|
|EI Accession Number|
Carbon Tetrachloride ; Catalysis ; Dechlorination ; Doping (Additives) ; Hydrogenolysis ; PH ; Thiophene
|ESI Classification Code|
Chemistry, General:801.1 ; Chemical Reactions:802.2 ; Chemical Agents And Basic Industrial Chemicals:803 ; Organic Compounds:804.1 ; Inorganic Compounds:804.2
|ESI Research Field|
Cited Times [WOS]:3
|Document Type||Journal Article|
|Department||School of Environmental Science and Engineering|
1.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,Guangdong Province,518055,China
2.South China Institute of Environmental Sciences,Ministry of Ecology and Environment,Guangzhou,Guangdong Province,510655,China
3.Institute of Groundwater and Earth Science,Jinan University,Guangzhou,Guangdong Province,510632,China
4.Innovation Center of Southern University of Science and Technology,Beijing,100083,China
|First Author Affilication||School of Environmental Science and Engineering|
|First Author's First Affilication||School of Environmental Science and Engineering|
Ding，Longzhen,Wang，Yuhan,Tong，Lizhi,et al. N-doped biochar-catalyzed dechlorination of carbon tetrachloride in sulfide-containing aqueous solutions: Performances, mechanisms and pathways[J]. WATER RESEARCH,2022,223.
Ding，Longzhen,Wang，Yuhan,Tong，Lizhi,Liu，Na,Wang，Chao,&Hu，Qing.(2022).N-doped biochar-catalyzed dechlorination of carbon tetrachloride in sulfide-containing aqueous solutions: Performances, mechanisms and pathways.WATER RESEARCH,223.
Ding，Longzhen,et al."N-doped biochar-catalyzed dechlorination of carbon tetrachloride in sulfide-containing aqueous solutions: Performances, mechanisms and pathways".WATER RESEARCH 223(2022).
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