The invention discloses a synthetic method for a supported
silver phosphate /
silver catalyst. The synthetic method includes steps of weighing 1-1.2mmol of
silver nitrate to prepare 10-15mmol / L of solution at first and dripping weak aqua
ammonia into the solution to obtain Tollens'
reagent; then weighing 20g of
bentonite; adding 80-100mL of
distilled water into the
bentonite to immerse the
bentonite for 10 hours to 12 hours so as to obtain
bentonite suspension; dripping the Tollens's
reagent into the
bentonite suspension, stirring,
ageing in water bath at the temperature
ranging from 80 DEG C to 85 DEG C for 24 hours, washing by four times to five times, and adding 30-50mL of
distilled water; dripping 0.01-0.1mol / L of
phosphoric acid in a product, stirring for 4 hours, leading the
mole ratio of the adding quantity of the
phosphoric acid to the used quantity of the
silver nitrate to be 1:3,
ageing in water bath at the temperature
ranging from 60 DEG C to 65 DEG C for 24 hours after stirring is finished, and repeatedly washing until supernate is neutral; and finally
drying at the temperature of 105 DEG C,
grinding, and irradiating under an
xenon lamp with the power of 400-500w for 50-80 minutes so as to obtain the supported
silver phosphate /
silver catalyst. Utilization efficiency to natural light is increased, stability of a
system is guaranteed, a nanometer laminated structure of the bentonite is utilized, accordingly, absorption ability of the catalyst and a carrier is improved, and degradation efficiency is increased.