Study on photocatalytic activities of fly ash in the mine power plant

Using sunlight,UV lamp,mercury lamp as the excitation light source and methyl orange as the experimental wastewater.The photocatalytic activities of the fly ash was studied with BET,XRD and Langmuir-Hinshelwood(LH) kinofic equation.The results showed that the adsorption of methyl orange on fly ash matched Langmuir equation 1/q_t=0.653 9+0.454 4/C_e without lighting.The decolourization rate of fly ash treating methyl orange in excited lighting is higher 1%~9% than in no lighting,and the photocatalytic activity is the largest under the sunlight,which showed that Fe_2O_3 on fly ash microsphere can absorb visible light and has photocatalytic activity.It is different between the rate constant of adsorption in no excitated light and the rate constant of the first order reaction in excitated light.The main influence factors of the photocatalytic activity are wave-length,the quantity of fly ash and the initial pH value.