Cu_2O/CuO的制备及光催化性能研究
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摘要
以葡萄糖为还原剂、采用液相法首先制备了八面体Cu_2O光催化剂,然后以其为基体,通过原位氧化Cu_2O的方式构筑Cu_2O/CuO复合光催化剂。通过XRD、拉曼、XPS对其成分进行检测,TEM、SEM观察其粒径和形貌;研究了亚甲基蓝降解工艺条件,实验结果表明,ρ(亚甲基蓝)=5 mg/L的溶液100 mL、Cu_2O/CuO复合光催化剂的最佳添加量为10 mg、体系pH=11时亚甲基蓝的降解效果最好。通过对最佳条件下循环降解实验表明,Cu_2O/CuO复合光催化剂有着良好的循环稳定性能。
The octahedral Cu_2O photocatalyst was firstly prepared by the liquid phase method using glucose as the reducing agent,and then the Cu_2O/CuO composite photocatalyst was constructed by in situ oxidation of Cu_2O.XRD,Raman and XPS were used to detect its composition.The particle size and morphology were observed by TEM and SEM.The results of methylene blue degradation experiment showed that when the concentration of methylene blue was 5 mg/L and the volume is 100 mL,Cu_2O/CuO composite light was observed.The best effect of methylene blue was obtained when the optimal amount of catalyst was 10 mg and the pH of the system was 11.The experimental results of cyclic degradation under optimal conditions show that the Cu_2O/CuO composite photocatalysis has good cycled stability.
The octahedral Cu_2O photocatalyst was firstly prepared by the liquid phase method using glucose as the reducing agent,and then the Cu_2O/CuO composite photocatalyst was constructed by in situ oxidation of Cu_2O.XRD,Raman and XPS were used to detect its composition.The particle size and morphology were observed by TEM and SEM.The results of methylene blue degradation experiment showed that when the concentration of methylene blue was 5 mg/L and the volume is 100 mL,Cu_2O/CuO composite light was observed.The best effect of methylene blue was obtained when the optimal amount of catalyst was 10 mg and the pH of the system was 11.The experimental results of cyclic degradation under optimal conditions show that the Cu_2O/CuO composite photocatalysis has good cycled stability.
引文
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[2] CAREY J H,LAWRENCE J,TOSINE H M.Photodechlorination of PCB′s in the presence of titanium dioxide in aqueous suspensions[J].Bulletin of Environmental Contamination and Toxicology,1976,16(6):697-701.
[3] LI F,XIA L,LIU X,et al.Preparation and photocatalytic properties of visible-light-driven ZnO nanostructures[J].Journal of Shenyang University,2017,29(3):179-183.
[4] MENG X,LI Z,CHEN J,et al.Enhanced visible light-induced photocatalytic activity of surface-modified BiOBr with Pd nanoparticles[J].Applied Surface Science,2018,433(17):76-87.
[5] IKEDA S,TAKATA T,KONDO T,et al.Mechano-catalytic overall water splitting[J].Chem Commun,1998,40(20):482-485.
[6] HARA M,KONDO T,KOMODA M,et al.Cu2O as a photocatalyst for overall water splitting under visible light irradiation[J].Chem Commun,1998,3(3):357-358.
[7] ZOU M,LIU H,FENG L,et al.Enhanced visible light photocatalytic activity in N-doped edge-and corner-truncated octahedral Cu2O[J].Solid State Sciences,2017,65:22-28.
[8] CHU C Y,HUANG M H.Facet-dependent photocatalytic properties of Cu2O crystals probed by using electron,hole and radical scavengers[J].Journal of Materials Chemistry A,2017,29(5):15116-15123.
[9] MATEO D,ALBERO J,GARC A H.Photoassisted methanation using Cu2O nanoparticles supported on graphene as a photocatalyst[J].Energy & Environmental Science,2017,11(10):2392-2400.
[10] DING R C,FAN Y Z.High efficient Cu2O/TiO2 nanocomposite photocatalyst to degrade organic polluant under visible light irradiation[J].Chemistryselect,2018,3:1682-1687.
[11] XIA Y,HE Z,YANG W,et al.Effective charge separation in BiOI/Cu2O composites with enhanced photocatalytic activity[J].Materials Research Express,2018,144:1-14.
[12] YU X J,KOU S,ZHANG J,et al.Preparation and characterization of Cu2O nano-particles and their photocatalytic degradation of fluroxypyr[J].Environmental Technology,2018,39(22):2967-2976.
[13] STADNICHENKO A I,SOROKIN A M,BORONIN A I.XPS,UPS,and STM studies of nanostructured CuO films[J].J Struct Chem,2008,49(2):341-347.
[14] CHEN K F,XUE D F.pH-assisted crystallization of Cu2O:Chemical reactions control the evolution from nanowires to polyhedra[J].Crystengcomm,2012,14:8068-8075.
[15] SAKAI Y,NINOMIYA S,HIRAOKA K.XPS depth analysis of CuO by electrospray droplet impact[J].Surface & Interface Analysis,2012,44(8):938-941.
[16] CHEN Z,JIANG H,JIN W,et al.Enhanced photocatalytic performance over Bi4Ti3O12 nanosheets with controllable size and exposed {001} facets for Rhodamine B degradation[J].Applied Catalysis B:Environmental,2016,180:698-706.
[17] AL-QARADAWI S,SALMAN S R.Photocatalytic degradation of methyl orange as a model compound[J].Journal of Photochemistry and Photobiology A Chemistry,2002,148:161-168.
[18] GUO R,FANG L,DONG W,et al.Enhanced photocatalytic activity and ferromagnetism in Gd doped BiFeO3 nanoparticles[J].Journal of Physical Chemistry C,2010,114(49):21390-21396.
[19] MA H,LIU Y,FU Y,et al.Improved photocatalytic activity of copper heterostructure composites(Cu-Cu2O-CuO/AC)prepared by simple carbothermal reduction[J].Aust J Chem,2014,67(5):749-759.
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