Preparation Of Modified Mesoporous Titanium Dioxide And Application In Environment Pollution Control

With the increasing environmental pollution, it is important to improve pollution control methods.Organic pollution and heavy metal pollution are two problems to be solved urgently in current water environmental pollution.Mesoporous Ti O2 materials have the characteristics of large specific surface area,non-toxic,harmless,no two pollution etc.,modified on titanium dioxide nano material and studying on photocatalytic and heavy metal adsorption performance of materials is one of the research focuses of material science in recent years.This paper focuses on the following contents:1、TBOT and P123 was used as the titanium source and structure directing template respectively to preparated mesoporous Ti O2 sample by hydrothermal method.The samples were characterized by XRD, TEM, N2 adsorption and desorption test,FT-IR spectra analysis,and thermogravim etric analysis to discusses the influence of synthetic conditions on the crystal structure, morphology, properties, photocatalytic performance and to detemine the optimum preparation conditions:60m L ethanol in solution A,2g P123,hydrothermal temperature is 60℃,p H=4, calcination temperature is 500℃.The mesoporous Ti O2 samples of the optimum preparation conditions areanatase phase,the average particle size is about 10 nm,with irregular、wormlike mesoporous structure.After the 120 min photodegradation of 10mg/L methyl orange solution under simulated sunlight,the degradation rate reached 73.0%.2、Dithizone doped mesoporous Ti O2 samples were prepared by using impregnation,investigating the effect of different synthesis conditions on sample properties,morphology,photocatalytic,heavy metal adsorption properties of Cd etc.,and deteming the optimum preparation conditions for the adsorption of heavy metal solution Cd: p H=5、hydrothermal temperature is 60℃,the mass ratio of dithizone and mesoporous Ti O2 is 0.1.The mesoporous Ti O2 samples of the optimum preparation conditions have uniform particle size distribution,average particle size is about 20 nm.The best adsorption effect ofmesoporous Ti O2 doped dithizone samples reached 98.3%,mesoporous Ti O2 is only18.2%.After the 120 min photodegradation of 10 mg/L methyl orange solution under simulated sunlight,the best degradation rate reached 91.3%,it is obviously improved compared with pure mesoporous Ti O2 samples.This indicates that adsorption performance and photocatalytic properties of doped samples are ideal.