Synthesis And Properties Of Ti-Al Porous Photocatalytic Materials

Different types of porous materials have been paid more attention with the further study on photocatalytic materials. Ti-Al porous materials are rarely studied in the literature. In this paper, Ti-Al porous materials were prepared by hydrothermal reaction method and solvent thermal reaction method. Ti-Al porous materials’ s physical and chemical properties and photocatalytic performance were studied by changing the preparation conditions.(1) Ti-Al porous materials were prepared by using CTAB(water) as the template.In this paper, the optimal conditions of Ti-Al porous materials were : n(Ti)/n(Al) was10:1, n(Ti)/n(CTAB) was 10:1, the sample was calcined at 550 oC for 6 h, the hydrothermal crystallization time was 45 hours. By the analysis of characterization, all the samples were anatase Ti O2, the particle size was between 0.5 μm-10 μm. With the increase of Al content, the specific surface area’s trend was first increased and then decreased, the specific surface area was 115.9 m2/g when n(Ti)/n(Al)=10:1. With the increase of CTAB content, the average pore size’s trend was first increased and then decreased, the average pore size was 24.6 nm when n(Ti)/n(CTAB)=10:1. With the increasing calcination temperature, the lattice parameters increased gradually, while the specific surface area decreased gradually. The increasing hydrothermal time could help to improve the crystallinity, while a long hydrothermal time would inhibit the growth of the grain size. By FT-IR analysis results, all the samples had Ti-O bond and Al-O bond. The 1Al-10 Ti O2(1/10 CTABwater) sample’s grain size was 11.0 nm, the specific surface area was 115.9 m2/g, the average pore size was 24.6 nm. The adsorption rate of the 1Al-10 Ti O2(1/10 CTABwater) sample to Reactive Brilliant Red X-3B was 20.8%,the photocatalytic degradation rate was 47.0%, the decolorization rate was 67.8%.(2) Ti-Al porous materials were prepared by using CTAB(ethanol) as the template.In this paper, the optimum preparation conditions of Ti-Al porous materials were :n(Ti)/n(Al) was 10:1, n(Ti)/n(CTAB) was 10:1, the sample was calcined at 600 oC for 6h, the solvent thermal crystallization time was 45 hours. By the analysis of characterization, all the samples were anatase Ti O2, the particle size was between 1μm-10 μm. With the increase of Al content, the specific surface area’s trend was first increased and then decreased, the average pore size increased gradually, the specific surface area was 134.9 m2/g when n(Ti)/n(Al)=10:1. With the increase of CTAB content, the grain size’s trend was first increased and then decreased, the grain size was14.4 nm when n(Ti)/n(CTAB)=10:1. With the increasing calcination temperature, the lattice parameters increased gradually, the cell volume also increased gradually. By FT-IR analysis results, all the samples had Ti-O bond and Al-O bond. The1Al-10 Ti O2(1/10 CTABethanol) sample ‘s grain size was 14.4 nm, the specific surface area was 134.9 m2/g, the average pore size was 14.8 nm. The adsorption rate of the best sample to Reactive Brilliant Red X-3B was 18.6%, the photocatalytic degradation rate was 37.9%, the decolorization rate was 56.5%.(3) Ti-Al porous materials were prepared by using TBAOH(25 % in H2O) as the template.Using In this paper, the optimum preparation conditions of Ti-Al porous materials were : n(Ti)/n(Al) was 10:1, n(Ti)/n(TBAOH) was 15:1, the sample was calcined at 650 oC for 6 h, the solvent thermal crystallization time was 45 hours. By the analysis of characterization, all the samples were anatase Ti O2, the particle size was between 0.5 μm-12 μm. With the increase of Al content, the specific surface area increased gradually, when the Al content reached saturation, the specific surface area decreased gradually, the specific surface area was 92.8 m2/g when n(Ti)/n(Al)=10:1.With the increase of TBAOH content, the average pore size’s trend was first increased and then decreased, the average pore size was 27.5 nm when n(Ti)/n(TBAOH)=15:1.With the increasing calcination temperature, the lattice parameters increased gradually,the cell volume also increased gradually. With the increasing solvothermal crystallization time, the specific surface area and the average pore size both increased gradually, it was not conducive to prepare porous materials. All the samples’ Ft-IR spectra appeared the diffraction of Ti-O bond and Al-O bond. The 1Al-10 Ti O2(1/15TBAOH) sample’s grain size was 10.2 nm, the specific surface area was 92.8 m2/g, theaverage pore size was 27.5 nm. The adsorption rate of the 1Al-10 Ti O2(1/15 TBAOH)sample to Reactive Brilliant Red X-3B was 18.0%, the photocatalytic degradation rate was 39.6%, the decolorization rate was 57.6%.