Synthesis And Properties Of Macroporous Titanium-based Photocatalytic Materials

TiO2was considered as the most important semiconductor photocatalysts duo to itsvarious merits, such as excellent photocatalytic activity, low cost, chemical biologicalinterness, and nontoxicity. People also concern about the recycle-reuse performance ofTiO2. In order to improve the suspension and recycling performance of the catalyst,based on collodial carbon spheres as the template. The synthesized of macroporous TiO2photocatalyst by using the template method. In this paper, metallic element aluminumand non-metallic boron were used to improve the photocatalytic activity of TiO2. It wasstudied the preparation conditions on physical and chemical properties of materials andthe influence on the photocatalytic activity of reactive brilliant red X-3B.The preparation of colloidal carbon spheres. It was chosen the glucose solution asthe raw material and synthesize the colloidal carbon spheres via hydrothermal method.It was studied the influence of different preparation conditions of carbon ball size. Theeffect of hydrothermal time and the concentration of glucose solution on the carbonballs were investigated by X-ray diffraction (XRD), scanning electron microscope(SEM) and FT-IR.Using the carbon sphers as the template, tetrabutyl orthotitanate (TBOT) as Tisource, macroporous TiO2was prepared by template method. The best calcinationtemperature is600℃. Based on the previous experiment, macroporous Al-TiO2、macroporous B-TiO2photocatalytic materials was synthesized. Powder X-raydiffraction (XRD), scanning electron microscope (SEM), FT-IR, and N2adsorption-desorption were employed to analyze morphology and structure of thematerials. It was studied the influence on materials and photocatalytic activity under different concentration of Al、B and different calcination temperature.The results indicate that all the macroporous Al-TiO2、B-TiO2samples presentedanatase TiO2phase. The diameters of hollow structure were about200nm. The samplesurface is smooth. Al and B doping inhibited growth of TiO2, the optimal content was0.1%Al-TiO2and8%B-TiO2. With the increasment of calcination temperature, thecrystallinity sizes increase, while the surface area of the samples decreases. The SEMand distribution of pore size indicate that the photocatalysts were macroporous materials.Compared with macroporous TiO2materials, the decoloration of reactive brilliant redX-3B with macroporous0.1%Al-TiO2and macroporous8%B-TiO2after30min ofUV-light irradiation was enhanced. After four recycle-reuse, the macroporousphotocatalyst still has high photocatalytic activity.