Title: Synthesis of SnO_2/TiO_2 composite photocatalyst loaded with Ag nanoparticles and its application in wastewater treatment
Abstract:Aim To synthesize SnO2/TiO2 composite photocatalyst loaded with Ag nanoparticles and to study its applications in wastewater treatment.Methods With Ti(n-C4H9)4,CH3CH2OH and SnCl4 as the raw material,S...Aim To synthesize SnO2/TiO2 composite photocatalyst loaded with Ag nanoparticles and to study its applications in wastewater treatment.Methods With Ti(n-C4H9)4,CH3CH2OH and SnCl4 as the raw material,SnO2/TiO2 composite photocatalyst loaded with nanoparticles was prepared via sol-gel process and photo-reduction.Rhodamine B was selected as the model pollutant to investigate UV Vis-absorption spectrum and photocatalytic activity of the composite photocatalyst by means of XRD,UV-Vis and so on.The effect of the composite ratio of SnO2 and TiO2 on the photocatalytic activity of the synthesized samples was also discussed.Results When the best ratio of titanium and tin in the nano-TiO2/SnO2 photocatalyst is 156∶1,the photocatalytic activity of the photocatalyst is high;Under the xenon lamp,the photocatalytic activity of TiO2/SnO2 loaded with Ag nanoparticles not only enhanced obviously,but it also has a very strong visible light activity.Experimental results of wastewater treatment show that the value of COD in the sunlight for 2 h in the refinery wastewater is reduced from 844 mg/L to 472 mg/L,removal rate is up to 44.08%;and the removal rate of COD in the light for 5 h,is 76.78%,and its chroma and smell are both removed.When the molar ratio of SnO2/TiO2 composite photocatalyst loaded with Ag is 1∶1(molar ratio),the removal efficiency COD in refinery wastewater is higher.Conclusion The nano-TiO2 synthesized under optimization condition was used to prepare TiO2 photocatalyst loaded with Ag nanoparticles by a photoreduction process.The photocatalytic degradation results showed that the as-prepared TiO2 photocatalyst loaded with Ag nanoparticles has good performance in treatment of wastewater in oil production plant,COD removal efficiency in wastewater is 76.78% under the sun-light for 5 h.Read More
Publication Year: 2011
Publication Date: 2011-01-01
Language: en
Type: article
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