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The Photocatalytic Degradation of Nitro-phenol by B-N-Er-TiO2 and F-N-Er-TiO2 Nanocrystal under Visible Light

Author: LiJing
Tutor: ShangQingKun
School: Northeast Normal University
Course: Analytical Chemistry
Keywords: B（2%）-N（43%）-Er3+（10%）- TiO2 F（2.5%）-N（43%）-Er3+（10%）- TiO2 Mesoporous Photocatalysis Upconversion
CLC: O643.32
Type: Master's thesis
Year: 2011
Downloads: 47
Quote: 1
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Abstract


Different types of heterogeneous catalysts in the degradation of organic pollutants has been widely investigated and applied, in which TiO2 play a much larger role, mainly because it is easy to be prepared, inexpensive, chemically stable, environmentally friendly, catalytic efficiency advantages. However, due to the wide band gap of TiO2 Eg = 3 .2 eV, it can only absorb UV light, which greatly limits the photocatalytic application of TiO2. In this paper, nano-titanium dioxide doped by rare earth ions and non-metallic elements B, N, F, has been synthesized. Through the upconversion luminescence properties of rare earth ion, change the visible light into ultraviolet light to achieve the purpose of using visible light degradation of organic pollutants by TiO2. Specific work in the following areas:1. B（2%）-N（43%）-Er3+（10%）- TiO2 and F（2.5%）-N（43%）-Er3+（10%）- TiO2 mesoporous materials were prepared by the sol-gel method.2. The synthesized TiO2 characterized by XRD, UV-Vis, BET, SEM, and upconversion luminescence spectra, after the characterization results were discussed in detail.3. The photocatalytic degradation of nitrophenol solution under visible light by B（2%）-N（43%）-Er3+（10%）- TiO2 and F（2.5%）-N（43%）-Er3+（10%）- TiO2 were systematic studied, including the effect of different calcination temperature （600°С, 700°С, 800°С, 900°С）, the doping amount of non-metallic elements in catalyst, the initial p-nitrophenol solution concentration and different pH. And exploring the mechanism of mesoporous formation, upconversion mechanism and energy absorption、transfer on the surface of titanium dioxide in photocatalytic degradation process.4. Comparing the B （2%）-N （43%）-Er3 + （10%） - TiO2 and F （2.5%）-N （43%）-Er3 + （10%） - TiO2 by degradation mechanism.In short, the degradation of nitrophenol solution by these two synthesized catalysts in the visible light achieved excellent results. The best degradation efficiency reached 87.6% and 96.87%, the effect of photocatalytic degradation of the co-doped TiO2 is far superior to the undoped TiO2. Our study could expand the degradation of organic pollutants by TiO2 under visible light irradiation.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalytic reaction
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