Study of Photocatalytic Degradation of Methyl Orange by Nano-ZnO with Oyster Shell Powder as Carrier

The photocatalyst,nano-ZnO,was prepared by precipitation method with Zn(NO3)2·6H2O and Na2CO3 as raw materials and oyster shell powder as carrier.Experiments were carried out using methyl orange(MO) as the pollutant object to evaluate the photocatalytic activity of nano-ZnO.A high-pressure mercury lamp with wavelength at 365 nm was used as the energy source for the photocatalytic experiments.The effects of catalyst amount,initial methyl orange concentration, irradiation time,light illuminance on the photodegradation rate of MO had been investigated.The results showed that,when the catalyst amount was 3 g·L-1,the photodegradation rate of MO was the highest.