Degradation of Methyl Orange under Visible-Light on Ag/AgCl/ZnAl-LDH
Coupling ZnAl-LDH,with Ag/AgCl/to synthesize Ag/AgCl/ZnAl-LDH composite pho-tocatalyst.The samples were characterized by XRD,SEM,TEM,BET and UV-Vis.The characterization results showed that the prepared AgCl loaded with ZnAl-LDH had a typical hydrotalcite structure,on which AgCl particles loaded.The photocatalytic activity test result showed that the methyl orange(MO)degradation percentage of 95.2％under the conditions of 25％AgCl loading,was obtained under visible light irradiation of 180 min at the MO concentration of 25 mg/L and catalyst dosage of 1 g/L.The photo-catalytic mechanism is deduced as following:under irradiation of visible light,Ag clusters are formed on the surface of AgCl,and in turn the electrons and holes are produced on Ag clusters,and then transfer to AgCl particles,forming·O-2 and·Cl active radicals,respectively,and then oxidize MO for decomposition.While ZnAl-LDH provides the substrate for Ag/AgCl particles.In the photocatalytic reaction process,both adsorption and kinetics affect the degradation of MO.
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