Study On Fabrication Of Nickel Hydroxide And Performance Of Degradation Of Pollutant

With the improvement of the human condition, water pollution on human health pose a serious threat. Nanomaterials for wastewater treatment is an effective way. Hydro xides of nickel hydroxide as an over metal element is a P-type semiconductor material having a variety of morphology, high activity, large surface area, and low prices, etc., is a potential degradation of water pollution material. Currently research on growth mechanism of nickel hydroxide is very few, nickel hydroxide is to be used lessly in the field of water degradation. In this dissertation, nickel hydroxide are prepared by hydrothermal method, XRD, XPS, SEM, EDS will be used to characteristic the properties of the nickel hydroxide in order to study the degradation under different growth conditions. Nickel hydroxide was modified with silver and the formation of heterojunction, then study the influence on the degradation of dye.Firstly, different morphologies of nickel hydroxide was prepared by nickel nitrate and different alkalinity on ITO substrate through hydrothermal method. XRD, XPS, SEM, EDS is to test the properties of the nickel hydroxide. Hexagonal plate nickel hydroxide can be generated by the reaction of nickel nitrate and ammonia, while network flaky nickel hydroxide can be generated by the reaction of nickel nitrate and hexamethyl enetetramine. The growth mechanisms of two kinds of morphology is interpreted. Network flaky nickel hydroxide can be shaped by the interaction of the step hydrolyzate product which hexamethylenetetramine yield.Secondly, the influence of nickel hydroxide structure and its effect on methyl orange degradation caused by the ratio of the solute and solvents, the volume of ammonia, hydrothermal temperature, annealing temperature, etc., has been studied. Degradation of different simulated pollutants(MO, CR, MB) by nickel hydroxide has selected properties.Degradation of CR is the fastest, followed by MO, MB is the worst.Furthermore, Nickel hydroxide is modified with silver and the formation of nickel hydroxide / zinc oxide heterostructures, which can accelerate the separation of the photogenerated electron-hole, hindered the recombination of electron-hole, and then improve the photocatalytic efficiency. The nickel hydroxide / Ag composite structure has highest degradation efficiency of methyl orange, when the concentration of silver nitrate was 0.015 M, light distance is 22 cm, exposure time is 5min. When six zinc oxide seed layer are on the surface of nickel hydroxide,the heterojunction obtain highest degradation efficiency of methyl orange.