Study on Preparation and Photocatalytic Properties of La-Cu₂O/MgO Composites

This paper studied the preparation methods of La-doped Cu₂O/MgO composites. The method used MgO as a carrier, La as a sensitizer and hydrazine hydrate as a reducing agent. The photocatalytic properties of the composite were studied with methyl orange solution as a probe. The La-Cu₂O/MgO composite photocatalyst with the best catalytic effect was prepared in the solution of 50mL 0.1mol/L Cu(NO₃)₂·3H₂O, adding 10mL 1mol/L NaOH, reaction time 3 hours, hydrazine hydrate dosage 5mL, carrier Magnesium Oxide 1g and lanthanum nitrate doping amount 4%. Under the 40W tungsten filament light, the dosage of La-Cu₂O/MgO composite was 0.2g/50mL, and the degradation rate of methyl orange solution with the concentration of 10mg/L may reach more than 90%. (paper)