Application of high-dispersity hybridization antibacterial agent in aspect of ultrafiltration membrane improvement

Abstract

The invention discloses application of a high-dispersity hybridization antibacterial agent in aspect of ultrafiltration membrane improvement. The high-dispersity hybridization antibacterial agent is a nanometer hybridization material formed by anchoring silver nanoparticles to a graphene slice layer. The application of the high-dispersity hybridization antibacterial agent for ultrafiltration membrane improvement comprises the steps that firstly, the high-dispersity hybridization antibacterial agent is added into N,N dimethylacetamide or N,N dimethylformamide or dimethyl sulfoxide, ultrasonography is performed to obtain a uniform dispersion agent, polyvinylidene fluoride or polyether sulfone is added into the dispersion agent, stirring is performed at the temperature of 55-65 DEG C to obtain a uniform casting membrane solution, standing is performed for defoaming for 6-12 h, pure water is adopted as a coagulation bath, and an immerged phase-inversion method is adopted for preparing a modified ultrafiltration membrane. The high-dispersity hybridization antibacterial agent has the good dispersity in water and a solvent, the good compatibility of the high-dispersity hybridization antibacterial agent and a membrane matrix is achieved, the high-dispersity hybridization antibacterial agent can be applied to modifying the ultrafiltration membrane, the application method is simple, and the obtained modified ultrafiltration membrane is good in performance.

Description

technical field [0001] The invention belongs to the application field of nanometer material technology, and in particular relates to the application of a highly dispersed hybrid antibacterial agent in the modification of ultrafiltration membranes. Background technique [0002] The development of nanotechnology has opened a new starting point for the application of nano silver antibacterial materials. As an emerging functional material, nano silver has unique physical and chemical properties. The preparation of nano-silver composite materials with stable structure requires some carriers with unique properties. Graphene oxide has a large specific surface area and high chemical stability, and can produce synergistic effects with nano-silver to improve the overall antibacterial effect of composite materials, which is ideal. Nanosilver loading matrix. In addition, graphene has good biocompatibility, and as a bacteriostatic agent, it will not produce toxic side effects on organi...

AI Technical Summary

Problems solved by technology

[0003] Nano-silver composite materials can be used for functional adsorbents, functional film modification, etc., but most of the preparation of nano-additives requires additional reducing agents and stabilizers to control the growth of silver nanoparticles, and few can be used for specific applications. adapted modification

[0004] Chinese patent (authorized announcement number: CN102125056B) discloses a preparation method of a silver / graphene antibacterial composite material, using reduced graphene oxide-polystyrene sodium sulfate as the nanoparticle carrier and reducing agent, and polystyrene sodium sulfate as the Water-soluble dispersant, AgNO 3 In order to reduce the precursor, a biosafe silver / graphene antibacterial composite material was prepared by reflux thermal reduction. However, in the early stage of this method, a strong reducing agent, hydrazine hydrate, was required to reduce graphene oxide. The experimental conditions were strictly controlled, demanding, and the process was complicated. For the separation membrane, the process is cumbersome

The GO-AgNPs prepared by the external reducing agent have good dispersibility in water, but they are directly deposited on the surface of the membrane, and the effective components are easy to lose in water separation applications.

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