【摘 要】
：
A novel Ag3PO4-CaO composite photocatalyst with enhanced photocatalytic activity was synthesized and utilized for degradation of ammonia from aqueous solution under sunlight.Ag3PO4 was prepared by precipitation method,and the composite of Ag3PO4-CaO was p
【机 构】
：
Catalyst Research Center, Chem.Eng.Dept., Razi University, Kermanshah 67149-67246, Iran
论文部分内容阅读
A novel Ag3PO4-CaO composite photocatalyst with enhanced photocatalytic activity was synthesized and utilized for degradation of ammonia from aqueous solution under sunlight.Ag3PO4 was prepared by precipitation method,and the composite of Ag3PO4-CaO was prepared via impregnation method.Utilization of eggshell for CaO synthesis provided a cost-effective and environmental friendly way for the heterogeneous catalyst production.The as-prepared photocatalysts were characterized by FT-IR,FE-SEM,TEM,EDX,UV-vis and PL.Results show that the Ag3PO4-CaO samples have excellent photocatalytic performances in the wide visible-light region.The effect of operating parameters like the content of Ag3PO4 in composite,initial ammonia concentration,pH of solution,catalyst dosage and oxygen supply was investigated.The photocatalyst with 60 wt％ content of Ag3PO4 had a high photocatalytic performance,because a low content of Ag3PO4 causes weak light absorption,and the excess amount of it results in serious electron-hole recombination due to the aggregation of Ag3PO4 particles.The maximum ammonia degradation (about 70％) was achieved in 340 mg/L of ammonia,pH 11,and 125 g/L of catalyst in the presence of pure oxygen.In comparison to Ag3PO4,60 wt％ Ag3PO4-CaO had a good stability and it could have been easily separated from the solution for recycling.
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