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河北祥鹄科学仪器有限公司

300UL+ Preparation of rare earth element lanthanum-doped TiO 2 photocatalyst by microwave hydrothermal method and its photocatalytic activity

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[Abstract]:
NoteThisresearchbytheresearcheroftheCollegeofChemistryandChemicalEngineeringofYunnanNormalUniversity,discussesthepreparationofrareearthelementlanthanum-dopedTiO2photocatalystandphotocatalyticactivityb
Note

This research by the researcher of the College of Chemistry and Chemical Engineering of Yunnan Normal University, discusses the preparation of rare earth element lanthanum-doped TiO 2 photocatalyst and photocatalytic activity by microwave hydrothermal method, published in the important journal .

Abstract

Preparation of rare earth element Er-doped TiO2 photocatalyst TiO2 - Er by microwave hydrothermal method and sol-gel method, using methyl orange solution as simulated pollutant under microwave radiation-ultraviolet illumination (MW-UV) and sunlight The photocatalytic degradation activity of TiO2-Er photocatalyst was investigated. The structure and characterization of TiO2-Er photocatalyst were carried out by N2 adsorption-desorption, ICP-AES and PL spectroscopy. The results show that Er doping can significantly improve the photocatalytic activity of TiO2 photocatalyst. The TiO2-Er photocatalyst prepared by microwave hydrothermal method has high photocatalytic activity. TiO2- prepared by microwave hydrothermal method and sol-gel method. Er photocatalyst microwave irradiation-ultraviolet illumination for 50 min, methyl orange degradation rate was 100% and 98.5%, and solar light for 4 h, methyl orange degradation rate was 99.0% and 97.5%, respectively. The microwave hydrothermal method has the advantages of short crystallization time and uniform doping of elements. The prepared TiO2 - Er photocatalyst has the characteristics of uniform morphology, large pore size, uniform pore distribution and large specific surface area, and Er doping can inhibit The photo-e-/h + composite makes the separation efficiency of photo-generated e-/h + improved, which is beneficial to the improvement of photocatalytic activity.

Details

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Conclusion

(1) The proper amount of Er element doping can significantly improve the photocatalytic activity of TiO2 catalyst. The photocatalytic activity of TiO2-Er photocatalyst prepared by microwave hydrothermal method is higher than that of sol-gel method, after microwave irradiation-UV illumination for 50 min. The degradation rates of methyl orange were 100% and 98.5%, respectively, and the degradation rate of methyl orange was 99.0% and 97.5%, respectively. (2) N2 adsorption-desorption analysis showed that the TiO2-Er photocatalyst prepared by microwave hydrothermal method and sol-gel method had uniform morphology, large pore size and uniform pore distribution; TiO2-Er light prepared by microwave hydrothermal method The specific surface area of the catalyst is larger than that of the sol-gel method, and the photocatalytic activity is higher. (3) ICP-AES and PL spectroscopy analysis showed that the amount of actually doped Er element in the TiO2-Er photocatalyst prepared by microwave hydrothermal method and sol-gel method was 0.092% and 0.160 respectively. %, microwave hydrothermal method has the advantages of short crystallization time and uniform Er element doping, and the proper amount of Er element doping can inhibit photo-generated e-/h + recombination, which improves the separation efficiency of photo-generated e-/h + and is beneficial to the catalyst. An increase in photocatalytic activity.

Instrument

Preparation of TiO2-Er photocatalyst by microwave hydrothermal method: Take 3.4 mL of n-butyl titanate, drop into a beaker containing 17.5 mL of absolute ethanol, stir to form solution A; weigh bismuth nitrate and titanium The ratio of the n-butyl acrylate material is 0, 0.002, 0.003, 0.004, 0.005 and 0.006, respectively, dissolved in 18.0 mL of twice distilled water to obtain solution B; Add dropwise to the A solution, and then add the D solution to the XH-800S microwave water parallel synthesis synthesizer for 4 h, set the reaction temperature to 160 °C, and the microwave reaction power is 600 W. After completion, it is cooled to room temperature, vacuum filtered, washed with deionized water to obtain a white filter cake, dried in vacuum for 2 h, and ground in a high-temperature box type electric resistance furnace for a certain period of time to obtain a TiO2-Er photocatalyst. The dryer is ready for use.

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