| Environmental problems have become increasingly prominent today;environmental pollution control technology is also attracting the attention of scholarsaround the world. Currently, looking for high efficiency, low cost, easy to recycle andreuse of the catalyst is a challenge facing the world today. This article is a series ofnew in-depth study based on the group conducted before.In this paper, the main research is as follows:(1) N-doped mesoporous TiO2weresuccessfully prepared by using CH3NO2as the nitrogen source, with butyl phthalateand titanium tetrachloride as mixed titanium source and P123as the template. Thematerials were characterized by TEM, N2sorption, XRD, XPS, UV-vis DRS andTG-DTA techniques. The catalytic activity of N/TiO2was also tested. When the flowrate is10.0mL min-1, elimination rate of methanol over0.1g photocatalyst(N/Ti-3:1-470) can be as high as99.33%at the initial methanol concentration of23.30g m-3;When the initial concentration of formaldehyde is3.23g m-3, elimination rate offormaldehyde reaches99.17%, which can also meet the national emission standard.The photocatalytic activity of N-doped TiO2was also tested in elimination of BTX(benzene, toluene and xylene). When xylene concentration was11.0g·m-3, the elimination rates over N/Ti-3:1-470catalyst were78.2%,52.4%,40.3%.The obtained N-doped mesoporous TiO2materials have betterphotocatalytic activity than commercial photocatalyst (Degussa P25). Moreover, theN-doped mesoporous TiO2photocatalysts are easy to prepare and have stableperformance, high photocatalytic activity and long life-time.(2) One organic–inorganic compound based on Keggin building blocks has beensynthesized by hydrothermal methods, C8H32N4O40Mo12Si(1). And it characterized byIR, TG-DTA, CV, FL and catalytic performance of compound1at different reactiontemperatures were investigated. When methanol concentration is5.37g·m-3, thereaction temperature is150°C, the complex has a higher oxidation ability, it indicatesthat the compound has good catalytic activity.(3) The new compound (H3O)4[(CoC14H12N2O10)1.5(SiW12O40)]·2H2O wassynthesised with Keggin-type silicotungstic heteropolyacid anion, organic ligands2,3-dipicolinic acid and cobalt nitrate as materials: Complex2crystallizes in trigonal,space group P-3c1, with the cell parameters of a=20.363(3), b=20.363(3),c=27.685(5),=90°,=90°,=120°, V=9942(3)3. Z=4, R1(F)=0.0579, R2(F2)=0.1645, Goof(S)=1.083. Evaluate the catalytic ability using methanol assimulated pollutants， compared with the parent Keggin-typesilicon molybdenum heteropoly acids, catalytic activity and stability of complex2areimproved. When the reaction temperature is within120°C~180°C, complex2has ahigher catalytic activity: When the system flow rate was10mL min-1, initialconcentration of methanol is about2.76g m-3, reaction temperature is140°C, complex2for methanol removal rate reached a maximum value, whichis82.6%. This shows that complex2has strong oxidation and reduction, in the caseof no load methanol can completely mineralized into CO2and H2O, This workprovides a theoretical basis for the further load, activation. This work not onlyenriches the chemical species, adding new members for chemical libraries, and alsoprovides a new catalytic material for removing organic pollutants. |
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