CoTiO_3光催化-类Fenton协同反应降解土霉素的研究
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摘要
采用溶胶-凝胶法成功制备CoTiO_3纳米粒子样品,并采用X射线衍射(XRD)、扫描电子显微镜(SEM)以及紫外-可见光(UV-vis)反射等方法对样品进行表征与分析。以CoTiO_3作为催化剂,过硫酸氢钾(PMS)为氧化剂,构建CoTiO_3/PMS体系,研究CoTiO_3用量、PMS浓度、反应温度和体系p H值对土霉素降解效果的影响。结果表明:当CoTiO_3为0.2 g,PMS浓度为5 mmol/L,温度为45℃时,CoTiO_3/PMS体系光照40 min后土霉素的降解率最高可达94.9%,表现出明显的光催化-类Fenton协同作用。
CoTiO_3 nanoparticles were successfully synthesized by sol-gel method, and the samples were characterized and anglyzed with X ray diffractometer(XRD), scanning electron microscope(SEM) and ultraviolet-visible(UV-vis)diffuse reflection, respectively. CoTiO_3/PMS system was constructed with CoTiO_3 as the catalyst, peroxymonosulfate(PMS) as oxidant. The effects of the amount of CoTiO_3, PMS concentration, reaction temperature and pH value of the system on the degradation of oxytetracycline were investigated. The results show that when the amount of CoTiO_3 is 0.2 g, PMS concentration is 5 mmol/L, and the temperature is 45 ℃, the degradation rate of oxytetracycline in CoTiO_3/PMS system can reach 94.9% after 40 min of illumination, showing obvious synergistic effect of Fenton and photocatalysis.
CoTiO_3 nanoparticles were successfully synthesized by sol-gel method, and the samples were characterized and anglyzed with X ray diffractometer(XRD), scanning electron microscope(SEM) and ultraviolet-visible(UV-vis)diffuse reflection, respectively. CoTiO_3/PMS system was constructed with CoTiO_3 as the catalyst, peroxymonosulfate(PMS) as oxidant. The effects of the amount of CoTiO_3, PMS concentration, reaction temperature and pH value of the system on the degradation of oxytetracycline were investigated. The results show that when the amount of CoTiO_3 is 0.2 g, PMS concentration is 5 mmol/L, and the temperature is 45 ℃, the degradation rate of oxytetracycline in CoTiO_3/PMS system can reach 94.9% after 40 min of illumination, showing obvious synergistic effect of Fenton and photocatalysis.
引文
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[2]XIAO T,TANG Z,YANG Y,et al.In situ construction of Hierarchical WO3/g-C3N4composite hollow microspheres as a Z-scheme photocatalyst for the degradation of antibiotics[J].Applied Catalysis B Environmental,2018,220:417-428.
[3]杨世迎,陈友媛,胥慧真,等.过硫酸盐活化高级氧化新技术[J].化学进展,2008(9):1433-1438.
[4]ANIPSITAKIS G P,DIONYSIOUS D D.Radical generation by the iInteraction of transition metals with common oxidants[J].Environmental Science&Technology,2004,38(13):3705-3712.
[5]AKHTER S,BASIRUN W J,ALIAS Y,et al.Enhanced amperometric detection of paracetamol by immobilized cobalt Ion on functionalized MWCNTs-Chitosan thin film[J].Analytical Biochemistry 2018,551:29-36.
[6]SHUKLA P R,WANG S,SUN H,et al.Activated carbon supported cobalt catalysts for advanced oxidation of organic contaminants in aqueous solution[J].Applied Catalysis B Environmental,2010,100(3/4):529-534.
[7]QI F,CHU W,XU B.Modeling the heterogeneous peroxymonosulfate/Co-MCM-41 process for the degradation of caffeine and the study of influence of cobalt sources[J].Chemical Engineering Journal,2014,235:10-18.
[8]CAI C,ZHANG H,ZHONG X,et al.Ultrasound enhanced heterogeneous activation of peroxymonosulfate by a bimetallic Fe-Co/SBA-15 catalyst for the degradation of orange II in water[J].Journal of Hazardous Materials,2015,283:70-79.
[9]CHEN Q,JI F,GUO Q,et al.Combination of heterogeneous fenton-like reaction and photocatalysis using Co-TiO2nanocatalyst for activation of KHSO5with visible light irradiation at ambient conditions[J].Journal of Environmental Sciences,2014,26(12):2440-2450.
[10]XU Y,SCHOONEN M AA.The absolute energy position of conduction and valence bands of selected semiconducting minerals[J].American Mineralogist,2000,85:3-4.
[11]LIN Y J,CHANG Y H,YANG W D,et al.Synthesis and characterization of ilmenite NiTiO3and CoTiO3prepared by a modified pechini method[J].Journal of Non-crystalline Solids,2006,352(8):789-794.
[12]QU Y,ZHOU W,FU H.Porous cobalt titanate nanorod:a new candidate for visible light-driven photocatalytic water oxidation[J].ChemCatChem,2014,6(1):265-270.
[13]WANGKAWONG K,PHANICHPHANT S,TANTRAVIWAT D,et al.CoTiO3/Ag3VO4Composite:a study on the role of CoTiO3and the active species in the photocatalytic degradation of methylene blue[J].Journal of Colloid&Interface Science,2015,454(2044):210-215.
[14]CHEN D,MA X,ZHOU J,et al.Sulfate radical-induced degradation of acid orange 7 by a new magnetic composite catalyzed peroxymonosulfate oxidation process[J].Journal of Hazardous Materials,2014,279:476-484.
[15]TAN C,GAO N,ZHOU S,et al.Kinetic study of acetaminophen degradation by UV-based advanced oxidation processes[J].Chemical Engineering Journal,2014,253:229-236.