| Currently, bacterial contamination of the water is the key issue in environment pollution and the antimicrobial treatment of the drinking water has gained a lot of research interest during the recent years. In this paper, three compound materials,CTS/PVP/Fe3O4/Ag compound material, carbon materials containing silver and nitrogen, loaded Cu/Ti O2 mesoporous carbon material, were carried out by applying the inorganic antibacterial additive, Ag and Cu, as main antibacterial components. Then,these three compound materials were applied into the antibacterial research of Escherichia coli(E.coil) which are common in drinking water.The main characteristic of CTS/PVP/Fe3O4/Ag compound material is the blends of Chitosan(CTS) and Polyvinyl Pyrrolidone(PVP), i.e. CTS/PVP, and treated as the inhibitory particles substrate. The method of producing CTS/PVP/Fe3O4/Ag compound inhibitory particles material is called sol-gel method. After confirming optimal conditions of preparing the CTS/PVP/Fe3O4/Ag with optimum inhibitory properties through the orthogonal experiment, the research showed that the inhibitory rate can reach up to 77% when C(Ag NO3)=0.8%, C(CTS)=1.5%, C(PVP)=2%, and C(Fe3O4)=2.5%. By applying a low concentration Na OH solution for alkaline treatment allows the particle material has a certain toughness and mechanical strength.Alongside of this, the preliminary study of binding mechanism between active groups of CTS/PVP/Fe3O4/Ag was carried out by implementing the infrared characterisation.Additionally, a dense and uniform appearance shown on the particle surface was observed by using the electron microscopy(SEM) to characterise the surface morphology of the ball, and accessing Ag and Fe3O4, it can be seen that both of them present on the particle surface as well as embedded internally. Afterwards, the X-ray diffraction is adopted to investigate the crystal structure of material, which indicates thatthe Ag is reduced to the nanoscale elemental Ag with better dispersion state. The magnetic adsorption capacity after adding nano Fe3O4 can be investigated through the vibrating sample magnetometer(VSM), in order to prove that the material has a strong saturation magnetic susceptibility, and is susceptible to be attracted by external magnetic fields. In the meantime, physical and chemical properties, antibacterial long-last performance, practical antibacterial properties within the water, and other properties of the particle material are investigated.Utilizing the Schiff base carbon nitrogen polymer which is the reaction of p-phenylenediamine and glyoxal as the substrate, and using the Ag NO3 as the inhibitor to form a composite material of Ag+ and N atoms existed in the polymer ligand, hence create a new type of carbon material through the high temperature carbonisation are key characters of carbon materials containing silver and nitrogen. With regards to the investigation of surface area of material, pore size distribution as well as the adsorption and desorption forms were completed by physical adsorption instruments. In addition,X-ray Diffraction(XRD) and X-ray Photoelectron Spectroscope(XPS) were both carried out to investigate the crystal structure of carbon material and analyse bound states of each element in the material, separately. Alongside of these, Transmission Electron Microscope and Atomic Force Microscope were implemented to observe the surface morphology and the reduced form of internal Ag of the carbon material as well as the three-dimensional surface morphology of the material respectively. It can be seen from the research results that the nano-silver is uniformly loaded and well combined on the surface of carbon material. It was also demonstrated from the research that the inhibitory rate of this material can reach up to 90% when the molar ratio of Schiff bases and Ag is 1:0.8 and the carbonisation temperature of the material is 800°C. Furthermore,a well antibacterial effect is applied in practice, and the anti-silver leakage performance meets the requirement of national standards of drinking water.Regard to the main character of the loaded Cu/Ti O2 mesoporous carbon material,adding Cu2+ into the combination of Phenylenediamine and tetrabutyl titanate, for the purpose of incorporating with N atom of p-phenylenediamine through the coordination bonds form, hence accessing the glyoxal into the titanium hydroxide which is hydrolysed from the tetrabutyl titanate. As a result, a compound material, Schiff basepolymer with loaded Cu/Ti(OH)4 was formed, a new type of carbon material was produced through the high temperature carbonisation. During the analysis, the Thermogravimetric Analyser(TGA) was used to inspect the optimum carbonisation temperature is 600℃. With regards to the investigation of surface area of material is long-range order, pore size distributions is mesoporous as well as the adsorption and desorption forms were completed by physical adsorption instrument. In addition to this,the X-ray Diffraction(XRD) and X-ray Photoelectron Spectroscope(XPS) were applied to investigate the crystal structure of carbon material and analyse bound states of each element in the material separately, which showen that materials in the nanoscale Ti O2 and Cu elemental crystal phase and material of C, N, Cu, Ti elements have chemical bonding effect. Additionally, the Transmission Electron Microscope was utilised to observe the surface morphology and the reduced form of internal Cu of the carbon material. It was also presented from the research that the inhibitory rate of this material can reach up to 90% when the molar ratio of Schiff bases and Ti O2 is 5:2. Furthermore,a well antibacterial effect is applied in practice, and the anti-copper leakage performance meets the requirement of national standards of drinking water. |
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