The Influence Of Preparation Conditions On Morphology Of TiO₂ Nanotube Arrays And Property Studing

As a kind of n wide band gap inorganic semiconductor material, nano Ti O2 with its outstanding photocatalystic activity and features of non-toxic, and no secondary pollution, it’s been used widely in the areas of wastewater treatment, air clean, antibacterial activity and solar battery. As when dispersing nano Ti O2 into water will produce catalyst which is hard to recycle, which affect the practical application of nano Ti O2. Inspired by boundless forest, to make the invisible nanoparticles become nano tree, then nano forest, which is called Ti O2 nanotube arrays. Compared with the traditional powder-form, Ti O2 nanotube arrays has the features of higher specific surface, highly ordered and recyclable, so it has broader prospects.While restricted by the disadvantages of wide band gap, high compound rate of photogenerated electron hole, and the weakness of adsorption ability for organic pollutant in the water, the actual application result is unsatisfactory. It’s found out that the microscopic morphology of Ti O2 nanotube arrays can directly affect its photo-electro transition rate, the suitable pipe diameter, length and regularity of nano Ti O2 will directly increase its electronic migration rate, then improve the performance. So from the point of view of optimize the microscopic morphology of Ti O2 nanotube arrays, the main content of the essay are as belowFirst, make Ti O2 nanotube arrays by using anodization method, then produce few samples by changing the electrolysis voltage, electrolyte, electrolysis time, calcination temperature separately, it’s found out that different experimental condition will affect the pipe diameter, gap, length and the shape of Ti O2 by observing its microscopic morphology through SEM, then find out the best condition for producing the best shape: use the mixture of0.5%NH4F(quality score) and ethylene glycol with water of 5:1 as the electrolyte, to electrolyze for 2h under the voltage of 15 V. Due to the limit of laboratory condition, we can’t create battery directly to test its electro-optic conversion rate, so we use the photocatalytic of Ti O2 as the standard to test the product performance, and also use 20mg/L acid red 3R as the marker, to do the photo catalysis experiment under different conditions, then test the liquor byusing UV spectrophotometer and calculate the decolorizing rate. It’s found out that the performance could be the best if the electrolysis time is increased to 16 h based on the condition of producing the best shape, the decolorizing rate would be 70%, considerably better than the traditional Ti O2 hydrosol film of which decolorizing rate is 9%.To future improve the photocatalytic property of Ti O2 nanotube arrays and get some result by doping modification. Separately choose the element of Fe、Mo、V、S, and put it into the electrolyte, it’s found out that when the electrolyte has V(0.02mol/L) or Mo(0.01mol/L) or S(0.07mol/L), the photocatalytic property of the product can be increased 6%.Then choose V, S to together doped on products, and produce a series of products by changing the percentage of V,S, and found out that when mixed with both of V(0.02mol/L) and S(0.05mol/L), the photocatalytic property would be a little better than mixed with only one element, and improved greatly if compare with the product without doped.