Abstract
Photocatalysts in AgI-Ag3PO4 system were prepared from co-precipitation and ion-exchange methods. With an increment of KI concentration, the products prepared from both methods changed from Ag3PO4 to a combination of 3 phases (Ag3PO4, Ag5I2PO4 and AgI), then a mixture of AgI and Q (where Q = Ag5I2PO4 (for co-precipitation method) or Ag3PO4 (for ion-exchange method)), and finally to AgI. The preparation method strongly effected on the formation of Ag5I2PO4 in the products. Using the co-precipitation method, Ag5I2PO4 was formed easier than that of ion-exchange method. Product containing high concentration of AgI induced degradation of rhodamine B (RhB) favoring through the N-deethylation process. The dominant mechanism of the RhB degradation for photocatalyst with high Ag3PO4 or Ag5I2PO4 content occurred by the cleavage of chromophore structure of the RhB.
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