Alginate@ Ag3PO4 Membranes Prepared with Different Crosslinking Agents and Their Photocatalytic Degradation of Dyes

Ag3PO4 has attracted attention for its excellent photoresponsive utilization and good catalytic performance. However, Ag3PO4 nanoparticles are prone to aggregation and difficult to recycle. In this paper, NaAlg@Ag3PO4 photocatalytic material were prepared in-situ growth method using NaAlg as a carrier. And the NaAlg@Ag3PO4 water solution was used as the casting solution. Three different crosslinking agents, oxalic acid (OA), CaCl2 and CuSO¬4, were used to crosslink NaAlg@Ag3PO4, resulting in three photocatalytic composite membranes, denoted as OA@NaAlg@Ag3PO4, CaAlg@Ag3PO4 and CuAlg @Ag3PO4. The prepared membranes were tested by infrared spectrum (IR), water contact angle and swelling properties in normal saline. The photocatalytic degradation performance of these membranes for simulated pollutant methyl orange (MO) was studied. The results showed that the composite membrane crosslinked by oxalic acid had good swelling resistance. The photocatalytic degradation performance of OA@NaAlg @Ag3PO4 hydrogel membrane was better than that of CaAlg@Ag3PO4 and CuAlg@Ag3PO4 membranes, and its reusability was the best. Compared with Ag3PO4 nanoparticles, the composite hydrogel photocatalytic membrane was easier to operate and recycle.