首页|Phosphotungstic acid ionic liquid for efficient photocatalytic desulfurization:Synthesis,application and mechanism
Phosphotungstic acid ionic liquid for efficient photocatalytic desulfurization:Synthesis,application and mechanism
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An efficient mass transfer process is a critical factor for regulating catalytic activity in a photocatalytic desulfurization system.Herein,a phosphotungstic acid(HPW)active center is successfully composited with a quaternary ammonium phosphotungstate-based hexadecyltrimethylammonium chloride ionic liquid(CTAC-HPW)by the ion exchange method for the photocatalytic oxidative desulfurization of dibenzothiophene sulfide.The keggin structure of HPW and highly mass transfer performance of organic cations synergistically enhanced the photocatalytic activity towards the effective convertion of dibenzothiophene(DBT)with the excitation of visible light.The deep desulfurization(＜10 mg·kg-1)is attained within 30 min,and well stability is demonstrated within 25 cycles.Moreover,the CTAC-HPW photocatalyst projects well selectivity to interference from coexisting compounds such as olefins and aromatic hydrocarbons and universality of dibenzothiophenes,for example,4-methyldibenzothiophene(4-MDBT)and 4,6-dimethyldibenzothiophene(4,6-DMDBT).Ultimately,a possible photocatalytic desulfurization mechanism is proposed according to the Gaschromatography-mass spectrometry(GC-MS),proving that the final product is the corresponding sulfone.The trapping experiment and electron spin resonance(ESR)analysis confirmed that h+and·COOH played critical roles in the oxidation process.The work offers a practicable strategy for efficiently converting DBT to DBTO2 with added value.
Institute of Environmental Health and Ecological Security,School of Environment and Safety Engineering,Jiangsu University,Zhenjiang 212013,China
Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment,Suzhou University of Science and Technology,Suzhou 215009,China
School of Chemistry and Chemical Engineering,Institute for Energy Research,Jiangsu University,Zhenjiang 212013,China
National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaState Key Laboratory of Heavy Oil ProcessingJiangsu Collaborative Innovation Center of Technology and Material of Water Treatment,Suzhou University of Science and Technolog
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