Inorganic Chemicals Industry >
Photocatalytic oxidation of sodium sulfite in desulfurization wastewater by N-Zn/TiO2
Received date: 2020-04-27
Online published: 2020-11-24
N-Zn co-doped TiO2 catalyst（N-Zn/TiO2） was synthesized by sol-gel method and then was applied in photo-oxidation of sodium sulfite in double alkali desulfurization wastewater.The morphology and structure of N-Zn/TiO2 catalyst were characterized by XRD,FT-IR,XPS and FESEM.The effects of catalyst dosage,pH of solution,air flow rate and initial concentration of Na2SO3 on photocatalytic activities of N-Zn/TiO2 catalyst were investigated.The results showed that N-Zn/TiO2 catalyst could completely oxide Na2SO3 within 1.5 h.However,it takes 8 h to completely oxide the same pollutants without catalysts.The oxidation rate of Na2SO3 increased with the increasing of catalyst dosage.In addition,with the increasing of pH,the reaction rate firstly increased and then began to fall.The optimal reaction conditions were obtained as follow：catalyst dosage（the mass ratio of catalyst to Na2SO3） was 1/100, pH=6.5 and air flow rate was 4 L/min.
Min Hu , Jia Guo , Huadong Wu , Linfeng Zhang . Photocatalytic oxidation of sodium sulfite in desulfurization wastewater by N-Zn/TiO2[J]. Inorganic Chemicals Industry, 2020 , 52(10) : 151 -156 . DOI: 10.11962/1006-4990.2019-0598
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