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Nano TiO 2 nanoparticles unique surface effect , small volume effect , the quantum size effect and macroscopic quantum tunneling effect , and has a high photocatalytic activity , strong ultraviolet shielding , thermal conductivity , the unique properties of good dispersion has important applications in many areas of chemical, pharmaceutical, aerospace and environmental engineering . Moreover , compared with other n-type semiconductor , TiO 2 low toxicity effect . This paper reviews the research profile of the photocatalytic oxidation technology at home and abroad degradation of environmental pollutants , on this basis , using a variety of methods such as liquid-phase hydrolysis method , solvothermal template synthesized the nanoscale TiO 2 < / sub>, and by X- ray powder diffraction ( XRD ) , transmission electron microscopy ( TEM ) were characterized by scanning electron microscopy (SEM) , to filter out the low cost, simple synthesis methods , i.e. forced hydrolysis method . The synthesized TiO 2 metallic iron ions doping research . Phthalate , also known as phthalate esters, a large class of compounds widely used as plasticizers in the industrial , difficult to degrade, and therefore is the world 's most widespread environmental pollutants . It can enter the body through channels such as drinking , eating , skin contact and breathing , there is a lot of dangers . Device research and design and application of photocatalytic reactor overview, first elected homemade easy three phthalate esters compound dibutyl phthalate (DBP), o-phenylenediamine dimethyl diethyl (DEP), phthalate dimethyl (DMP) photocatalytic degradation effects of the irradiation time , the impact of factors such as catalyst amount, plus oxidant solution pH value on the degradation efficiency . Determine the best conditions for : H 2 O 2 < / sub> , a concentration of 0.05 mol / L, the optimum degradation pH of between 5.5 to 6.5 , the preferred catalyst concentration is 0.8 ‰ . The results showed that the hydrolysis Preparation of TiO2 on such compounds have good degradation effects of ultraviolet light exposure to one hour after the degradation rate of 90% or more, and greatly reduce the time and cost of biodegradability than the current universal degradation . Finally intermediates detected by GC-MS method for the first time to discuss the degradation pathway of phthalate esters may .
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