| The nano-TiO2because of its high active, security, no-toxic, chemical stability,easy cheap advantages of light catalysis in extremely popular. But it exist some shortcoming such as scattered uneven, easy reunion, easy deactivation, difficulty recovery. Thus prepared with high purity, particle size, morphology dispersion, good dispersion and better stability of nano-TiO2powder was the main direction of international research. This study has special preparation out the morphology of nanometer TiO2light catalyst, and their morphology and particle size, etc were characterized; the choice is difficult degradable organic dye methyl orange compounds as target degradants, preparing nanometer TiO2samples of the institute of light catalytic performance, and catalytic degradation in the process of light dynamics analysis; Finally, the prepared TiO2samples will be applied to HMX of the wastewater in actual degradation. The topic research for the preparation of nano-TiO2photocatalyst and its application in the field of environmental protection provides an important reference.This paper firstly combines the sol-gel method and self-assembly technique, the multi-layer assembly TiO2hollow microsphere was synthesized using PEG template. The surface morphology and crystal characterization of the samples obtained at different calcinations temperatures were characterized by FTIR, TEM, XRD, BET and TG-DTA. By the methyl orange degradation evaluates its catalytic activity. The effect of temperature and the assembly layers on the photocatalysis property of the TiO2hollow microsphere were investigated. The results indicated the hollow microspheres were synthesized. The diameter of the TiO2hollow microsphere was between100nm and200nm and dispersed well; assembling of four-under500℃calcined hollow microspheres has the best photocatalytic. The catalysis efficiency of microsphere samples of the amount2.5g/L on the methyl orange degradation in2hour was up to97.25%. The repeatability of photocatalytic activity was also tested and the degradation ratio was83.35%after three cycles. The preparation of hollow spheres as the precursor, it’s processing by hydrothermal method modification, the presence of the mineralizer, after72h reaction has special preparation were highly active fibrous titanium dioxide. The surface morphology and crystal characterization of the samples obtained at different calcinations temperatures were characterized by XRD, TEM and SEM, The products without calcinations is the anatase, micron-sized lengths, and aspect ratios of52-56, good dispersion no reunion phenomenon. Based on the catalytic experiment of methyl orange solution, titanium dioxide fiber of the amount5g/L degradation in30min reached70%or more, photocatalytic efficiency repeatability test show that the the catalytic efficiency is still above60%after three times.In the photocatalytic properties of the research experiment, spectrophotometry was used to the initial concentration of methyl orange solution, pH, the TiO2hollow microsphere catalyst conditions and other factors were optimized. When10mg/L methyl orange solution pH equal to2, the amount of catalytic was3g/L, the catalytic degradation efficiency was up to99.2%in120min. Degradation dynamics research shows that the catalyst for the low concentration of methyl orange solution(Co<50mg/L) adsorption in2hour adsorption balance, achieve to its degradation dynamics equations conform to first-level dynamic equation In C0/C=Kt. When H2O2was added, the photocatalytic reaction rate has doubled. Nano-TiO2hollow spheres appropriate dosage15g/L in the photocatalytic degradation of5hours make high concentration HMX wastewater COD value reduce74.36%. |
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