Preparation of g-C3N4/ Zn3In2S6 Composite Materials as Photocatalysts for the Highly Efficient Degradation of Antibiotic

We designed and succeeded in synthesising a sequence of g-C 3 N 4 /Zn 3 In 2 S 6 (ZIS) composite photocatalysts by means of one-step hydrothermal synthesis, which integrated different amounts of g- C 3 N 4 into ZIS. The prepared products are characterized by means of various characterization methods to determine their structure, morphology and physicochemical properties. Their photocatalytic activities were assessed according to the performance of tetracycline (C 22 H 24 N 2 O 8 , TC) degradation experiments with light radiation. This consequence of experiments showing that the g-C 3 N 4 (0.5 wt.%)/ZIS photocatalyst is most effective for the photodegradation of TC. Moreover, results from the cyclic tests confirm the stability of the g-C 3 N 4 (0.5 wt.%)/ZIS composite, which remained active after five cycles of repeated photocatalysis experiments. We can get the conclusion that O 2 - , OH and h + all played roles during the degradation process from the figures of ESR tests and active species trapping experiments. And the corresponding degradation mechanism of g-C 3 N 4 /ZIS composites is proposed. High specific surface areas, desirable absorption capability, suppression of charge recombination should be put down to its nice photocatalytic performance. Thus, it can be considered that g-C 3 N 4 /ZIS composites have broad potential application prospects in photocatalysis degradation.