Application of graphene nickel oxide nanocomposites in black and odorous water treatment

Abstract

In order to carry out osmotic purification of black and odorous water and solve the problems of low water flux, reverse solute diffusion and biological pollution affecting the forward osmosis performance, the author proposed the application of graphene nickel oxide nanocomposites in the treatment of black and odorous water. The hydrophilic metal-organic framework (UiO-66 nanoparticle) is embedded into the lamellar structure of graphene nickel oxide as a microporous filler, form ultra-thin “sandwich” film to improve FO performance. The added UiO-66 nano-particles introduce a uniform and suitable nano-channel, which can effectively let water penetrate, at the same time, block the reverse diffusion of Na+. The results show that the film with nanometer thickness formed by GO layer can prevent biological pollution, and the bacteriostatic effect can reach 90 %. In the FO model, the water flux of UiO-66/GO membrane is 29.16 LMH, which is 270 % higher than the original pure graphene nickel oxide membrane, and the reverse solute diffusion is 83.5 % lower (12.86 gMH). It is proved that this study provides an attempt for the application of MOF/GO film in FO process. Combining the excellent overall performance of UiO-66/GO film and the designable features of MOF structure, we expect that MOF/GO film will have broad application prospects as an advanced membrane material of FO technology.