Effect Of Sodium Silicate On Photocatalytic Propeities And Stability Of A Visible Light Responsive Photocatalyst

At present. Because of the application of TiO2in solar energy conversion,complex organic pollutant degradation as well as its good chemical stability, wearresistance, low cost.non-toxic and so on, It becomes one of the most promisingprotocatalyst. TiO2only can absorb ultraviolet light, but the sunlight photocatalyticactivity is very low. TiO2ususlly exists in the form of powders so it is difficult toreuse after its application. So we used Er3+:YAlO3as a kind of upconversionluminescence materials doped by element making it possible to be aroused by visiblelight and load it upon to Kureha spherical activated carbon surface to reuse. Throughsome study, recycle times have great influence on physical and chemical properties ofEr3+:YAlO3/TiO2-SAC.One aspect, recycle times will result in substantial wear ofEr3+:YAlO3/TiO2-SAC and its catalytic activity to reduce or disappear. Therefore, wehope to use inorganic binder sodium silicate to adhesive Er3+:YAlO3/TiO2andavctiited carbon together to increase the load of Er3+:YAlO3/TiO2and itsphotocatalytic and recycle times, as well as to reduce substantial wear.In this paper,we use Er3+:YAlO3/TiO2-SAC with sodium silicate as a kind ofload type visible light catalytic degradation material.（The light catalyst has bothactivated carbon adsorption and photocatalyst photocatalytic degradation functions.）With methyl orange as the target pollutants, explores the effect of absorbtion ofEr3+:YAlO3/TiO2-SAC and photocatalytic degradation after the different order ofsodium silicate addition. The results showed that: after different addition of sodiumsilicate the load in response to visible light catalyst of Er3+:YAlO3/TiO2has beengreatly improved, the activated carbon’s adsorption capacity reduced, but itsphotocatalytic degradation ability has improved.