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Novel visible-light responded aluminosilicophosphate-5 (SAPO-5)/g-C 3 N 4 composite has been easily constructed by thermal polymerization for the mixture of SAPO-5, NH 4 Cl, and dicyandiamide. The photocatalytic activity of SAPO-5/g-C 3 N 4 is evaluated by degrading RhB (30 mg/L) under visible light illumination (λ &gt; 420 nm). The effects of SAPO-5 incorporation proportion and initial RhB concentration on the photocatalytic performance have been discussed in detail. The optimized SAPO-5/g-C 3 N 4 composite shows promising degradation efficiency which is 40.6% higher than that of pure g-C 3 N 4 . The degradation rate improves from 0.007 min -1 to 0.022 min -1 , which is a comparable photocatalytic performance compared with other g-C 3 N 4 -based heterojunctions for dye degradation. The migration of photo-induced electrons from g-C 3 N 4 to the Al site of SAPO-5 should promote the photo-induced electron-hole pairs separation rate of g-C 3 N 4 efficiently. Furthermore, the redox reactions for RhB degradation occur on the photo-induced holes in the g-C 3 N 4 and Al sites in SAPO-5, respectively. This achievement not only improves the photocatalytic activity of g-C 3 N 4 efficiently, but also broadens the application of SAPOs in the photocatalytic field.

Enhanced Visible-Light Photocatalytic Performance of SAPO-5-Based g-C3N4 Composite for Rhodamine B (RhB) Degradation