作者：SijiaQian,ShengyanPu,YingZhang,PengWang,YingchenBai,BoLai 单位：StateKeyLaboratoryofGeohazardPreventionandGeoenvironmentProtection,ChengduUniversityofTechnology；StateKeyLaboratoryofEnvironmentalCriteriaandRiskAssessment,ChineseResearchAcademyofEnvironmentalSciences；StateKeyLaboratoryofHydraulicsandMountainRiverEnginee 本文刊于： 《Journal of Environmental Sciences》 2021年第02期
关键词:
Traditionalmetaldoping TiO2 GrapheneoxidKeywords
Traditional metal doping, TiO2, Graphene oxide, Non–hydroxyl radical, Tetracycline hydrochloride
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摘要
TiO2/graphene oxide（GO） as photocatalyst in the photo-degradation of multitudinous pollutants has been extensively studied. But its low photocatalytic efficiency is attributed to the high band gap energy which lead to low light utilization. Cu-TiO2/GO was synthesized via the impregnation methods to enhance the catalytic performance. The Cu-TiO2/GO reaction rate constant for photo-degradation of pollutants（tetracycline hydrochloride, TC） was about 1.4 times that of TiO2/GO. In 90 min, the removal ratio of Cu-TiO2/GO for TC was 98%, and the maximum degradation ratio occurred at p H 5. After five cycles, the removal ratio of Cu-Ti O2/GO still exceeded 98%. UV–visible adsorption spectra of Cu-Ti O2/GO showed that its band gap was narrower than TiO2/GO. Electron paramagnetic resonance（EPR） spectra test illustrated the generation rate of · O2-and · OH was higher in Cu-TiO2/GO system than TiO2/GO and TiO2 system. The contribution sequence of oxidative species was · O2-> holes（h +） > · OH in both TiO2/GO and Cu-Ti O2/GO system. Interestingly, the contribution of · OH in Cu-TiO2/GO was less than that in TiO2/GO during the photo-degradation process. This phenomenon was attributed to the better adsorption performance of Cu-Ti O2/GO which could reduce the accessibility of TC to · OH in liquid. The enhanced non–hydroxyl radical contribution could be attributed to that the more other active species or sites on（nearby） the surface of Cu-TiO2/GO generated after doping Cu. These results provide a new perspective for the tradition metal-doped conventional catalysts to enhance the removal of organic pollutants in the environment.
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