Abstract
In order to find the optimal combination method of secondary utilization of fly ash and g-C3N4 modification, an efficient composite photocatalyst of γ-Al2O3/g-C3N4 was obtained by calcining the composite precursors of Al(OH)3/DCDA. The introduction of Al(OH)3 prepared by fly ash into the precursors causes hydrogen bonding interactions between Al(OH)3 and DCDA, which facilitate the removal of N atoms from the edges of the CN framework of g-C3N4 during condensation, and the composites prepared possess more cyano defects. In addition, γ-Al2O3 and g-C3N4 form a chemical bond at the interface, and this chemical bonding causes the density of the electron cloud in the vicinity of the N atoms to increase. Among them, the strongest chemical bonding between Al2O3 and g-C3N4 was observed in ACN-1, while the most cyanine defects were formed in ACN-1, which made ACN-1 exhibit the best photocatalytic degradation of methylene blue, which is 2.48 times higher than that of the pristine g-C3N4.
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