Method for preparing stanniferous double-perovskite type phenol photocatalytic degradation catalyst

The invention discloses a method for preparing a stanniferous double-perovskite type phenol photocatalytic degradation catalyst. The catalyst is applied to carrying out a degradation reaction on low-concentration phenol sewage under the condition of simulated sunlight. According to the catalyst, a sol-gel method is used for preparation, and saccharose serves as a complexing agent. The method includes the steps that Sn powder is dissolved into a dilute nitric acid solution in a cold bath first, the obtained light yellow settled solution is then subjected to reacting and complexing with La(NO3)3-6H2O(1/8), Fe(NO3)3-9H2O(1/8) and polyethylene glycol 2000, and after roasting is conducted for 3 hours in the air atmosphere of 700 DEG C, a pure-phase double-perovskite type La2FeSnO6 photocatalyst sample is obtained. The molar ratio of selected La atoms to Fe atoms to Sn atoms is 2:1:1. The molar ratio of the saccharose to metal cations is 2:1. The method has the advantages that the sol-gel method with the saccharose used as the complexing agent is used for preparation, and the pure-phase double-perovskite type catalyst La2FeSnO6 is synthesized at a low temperature. The preparation method is simple, low in cost and free of pollution. The method has high catalytic activity and good structural stability when being used for low-concentration phenol degradation.