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Preparation and Photocatalytic Application of Titanium Dioxide Nanomaterials

Author: NiDong
Tutor: ShenYuHua
School: Anhui University
Course: Applied Chemistry
Keywords: TiO2 CuF2 Mn Photocatalytic Performance Visible
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 113
Quote: 0
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Abstract


Photocatalytic oxidation technology has become the most potential environmental problems of governance technical methods. In a variety of semiconductor, TiO2 because of its non-toxic, inexpensive, and stable chemical properties is recognized as the degradation of pollutants in air and water photocatalytic performance. However, TiO2 wide bandgap (3.2eV anatase and rutile 3.0 eV) so that it can absorb sunlight using only 5% of the UV light, which greatly limits the application of TiO2. Therefore, the preparation can also make use of ultraviolet (290-400 nm) and sunlight (400-700 nm) of TiO2 catalyst has great significance. In TiO2 doped with Ti sites of other compounds after all, a very good way. In this paper, we prepared two kinds of transition metal doped TiO2: (a) CuF2 doped TiO2 nano-sheet; (two) Mn-doped TiO2 nanoparticles and their photocatalytic properties were studied, the results synthetic samples found under visible light have good performance degradation of organic pollutants. We use different methods of synthesis CuF2 doped TiO2 nanosheets and Mn-doped TiO2 nanoparticles with SEM, TEM and XRD characterization samples were characterized by means of, and tested the photocatalytic properties of synthesized samples. Because these samples had never studied so carefully study these samples the physical and chemical properties makes sense. The main contents are as follows: 1. Through simple hydrothermal method using contains TBOT, Cu (NO3) 2, PVP and HF mixed solution preparation CuF2 doped Ti02 nanosheets. Scanning electron microscopy showed that the samples synthesized with side length of 60 nm sheet structure. Synthetic samples also studied under visible light photocatalytic degradation of methyl orange efficiency, the results show after the doped samples CuF2 photocatalytic degradation capability has been greatly improved, and the ratio of commercial Ti02 (P25) photocatalytic effect is better. Excellent photocatalytic effect depends on the unique shape and CuF2 sample doping. This novel photocatalysts for the synthesis of high catalytic performance Ti02 provides a feasible method. (2) by a simple hydrothermal method to TBOT and MnSO4 as precursors synthesized Mn-doped Ti02 nanoparticles. With XRD, SEM and SEM-EDS and other characterization methods were used to characterize the samples showed that samples prepared with good anatase, and after burning at 600 ℃ newly emerged rutile. Synthetic samples also studied under visible light photocatalytic degradation efficiency of calcium acid indicator showed that the doping 0.0388g MnSO4 uncalcined TiO2 catalytic performance than the catalytic properties of the sample after calcination better. This thesis also studied the amount of Mn and adding ammonia and calcination temperature of the sample.

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