Photocatalytic performance of TiO2 nanoparticles for 3,4-dichloronitrobenzene in methanol-aqueous solution
FEI Xuening1,2,3,, CUI Liangfu1, SHEN Congcong1,,, ZHANG Rubing1 1.School of Science, Tianjin Chengjian University, Tianjin 300384, China 2.School of Environment and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China 3.Tianjin Engineering Technology Center of Chemical Wastewater Source Reduction and Recycling, Tianjin 300384, China
Abstract:Under UV irradiation, the effects of the relative content of methanol and water in the mixed solvent on photocatalytic redox of 3,4-dichloronitrobenzene over titanium dioxide (TiO2) were investigated. Photocatalytic degradation efficiencies of 3,4-dichloronitrobenzene and yields of 3,4-dichloroaniline were measured. The results showed that the degradation efficiency reached 26.81% in the first 40 minutes of photocatalytic process when the volume ratio of methanol to water was 5∶5, while the yield of 3,4-dichloroaniline was the highest and reached 78% in 240 minutes of photocatalytic process when the volume ratio of methanol to water was 9∶1. The oxidation-reduction potential and hydroxyl radicals tests were used to reveal the photocatalytic mechanisms. High relative content of water in solvent was beneficial for oxidation, while high relative content of methanol in solvent was beneficial for reduction. As solvent of 3,4-dichloroaniline/3,4-dichloronitrobenzene and photogenerated hole scavenger, methanol could promote the reduction of 3,4-dichloronitrobenzene. As a reaction media, water was beneficial for hydroxyl radical production, and could promote the oxidation of 3,4-dichloronitrobenzene. Key words:TiO2/ 3,4-dichloronitrobenzene/ methanol-water solution/ photocatalytic reaction.
图13,4-二氯硝基苯和3,4-二氯苯胺的浓度标准曲线 Figure1.Standard curves of concentration of 3,4-dichloronitrobenzene and 3,4-dichloroaniline
图2TiO2纳米颗粒的XRD、TEM、HRTEM、SAED、UV-vis 漫反射吸收光谱和粒径分布图 Figure2.XRD, TEM, HRTEM, SAED, UV-vis diffuse re?ectance spectra and particle-size distribution pattern of TiO2 nanoparticles
图5甲醇-水的体积对3,4-二氯硝基苯的降解率和3,4-二氯苯胺产率的影响 Figure5.Effect of volume ratios of methanol-to-water on the degradation efficiencies of 3,4-dichloronitrobenzene and the yields of 3,4-dichloroaniline
图7在TiO2催化下,3,4-二氯硝基苯在混合溶剂中的光催化反应原理示意图 Figure7.Photocatalytic reaction schematic diagram of 3, 4-dichloronitrobenzene in mixed solvents with TiO2 catalyst
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1.School of Science, Tianjin Chengjian University, Tianjin 300384, China 2.School of Environment and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China 3.Tianjin Engineering Technology Center of Chemical Wastewater Source Reduction and Recycling, Tianjin 300384, China Received Date: 2020-11-03 Accepted Date: 2021-03-04 Available Online: 2021-05-23 Keywords:TiO2/ 3,4-dichloronitrobenzene/ methanol-water solution/ photocatalytic reaction Abstract:Under UV irradiation, the effects of the relative content of methanol and water in the mixed solvent on photocatalytic redox of 3,4-dichloronitrobenzene over titanium dioxide (TiO2) were investigated. Photocatalytic degradation efficiencies of 3,4-dichloronitrobenzene and yields of 3,4-dichloroaniline were measured. The results showed that the degradation efficiency reached 26.81% in the first 40 minutes of photocatalytic process when the volume ratio of methanol to water was 5∶5, while the yield of 3,4-dichloroaniline was the highest and reached 78% in 240 minutes of photocatalytic process when the volume ratio of methanol to water was 9∶1. The oxidation-reduction potential and hydroxyl radicals tests were used to reveal the photocatalytic mechanisms. High relative content of water in solvent was beneficial for oxidation, while high relative content of methanol in solvent was beneficial for reduction. As solvent of 3,4-dichloroaniline/3,4-dichloronitrobenzene and photogenerated hole scavenger, methanol could promote the reduction of 3,4-dichloronitrobenzene. As a reaction media, water was beneficial for hydroxyl radical production, and could promote the oxidation of 3,4-dichloronitrobenzene.