Non-wetting surface design with magnetic and visible-light-active properties and its application to pollutant treatment

Abstract

How to deal with organic pollutants of different densities and water-soluble pollutants is a challenge. In this paper, the slurry containing photocatalyst Ag3PO4, alkylated Fe3O4 and adhesive layer polydimethylsiloxane can be loaded to various substrates (including fabric, sponge, cotton) with a simple adsorption method. The non-wetability to water and the oleophilicity to organic solvent were realized by reducing the surface tension of solid through alkyl chain. It can not only remove pollutants floating on the water surface, but also adsorb pollutants whose density is greater than water and then realize the recovery with the response of the external magnetic field. It is important that the Ag3PO4 photocatalyst component in the material can absorb light energy to degrade water-soluble pollutants and further improve water quality. The stability tests (involving ultrasonic treatment, boiling water treatment and compression experiments) show that the prepared precursor slurry shows an excellent bonding stability with various substrates. Furthermore, graphene oxide has the best photodegradation behavior when 4 mg are added. Finally, photodegradation mechanism, the conduction (2.665 eV) and valence band (0.195 eV) information of the catalyst were analyzed.