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Heterojunction titanium dioxide/sodium magnesium titanate photocatalyst and preparation method thereof

A photocatalyst, titanium dioxide technology, applied in the field of photocatalysis, can solve the problems of long reaction time, high reaction temperature, large crystal size, etc., and achieve the effects of complete degradation, good dispersibility and enhanced catalytic activity

Inactive Publication Date: 2017-07-11
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method has a high reaction temperature and a long reaction time, and the prepared Na 0.9 Mg 0.45 Ti 3.55 o 8 The crystal size is large, the purity is low, and the purification is difficult

Method used

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  • Heterojunction titanium dioxide/sodium magnesium titanate photocatalyst and preparation method thereof
  • Heterojunction titanium dioxide/sodium magnesium titanate photocatalyst and preparation method thereof
  • Heterojunction titanium dioxide/sodium magnesium titanate photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 0.147g MgO, 5.787g TiO 2 , 5.000g NaOH is dispersed in 120mL deionized water, magnetically stirred evenly, the concentration of NaOH in the obtained mixed solution is 1mol / L, TiO 2 The concentration of MgO is 0.059mol / L, and the concentration of MgO is 0.030mol / L. The resulting mixed solution is moved to a reaction kettle, sealed, and under mechanical stirring, 300°C hydrothermal reaction for 60 minutes. The obtained product is deionized water and no Washed several times with water and ethanol until neutral, and dried at 60°C to obtain heterostructured TiO 2 / Na 0.9 Mg 0.45 Ti 3.55 o 8 catalyst of light.

Embodiment 2

[0023] 0.092g MgO, 5.787g TiO 2 , 5.000g NaOH is dispersed in 120mL deionized water, magnetically stirred evenly, the concentration of NaOH in the obtained mixed solution is 1mol / L, TiO 2 The concentration of MgO is 0.059mol / L, and the concentration of MgO is 0.019mol / L. Move the resulting mixed solution into a reaction kettle, seal it, and conduct a hydrothermal reaction at 300°C for 60 minutes under mechanical stirring. Washed several times with water and ethanol until neutral, and dried at 60°C to obtain heterostructured TiO 2 / Na0.9 Mg 0.45 Ti 3.55 o 8 catalyst of light.

Embodiment 3

[0025] 0.203g MgO, 5.787g TiO 2 , 5.000g NaOH is dispersed in 120mL deionized water, magnetically stirred evenly, the concentration of NaOH in the obtained mixed solution is 1mol / L, TiO 2 The concentration of MgO is 0.059mol / L, and the concentration of MgO is 0.042mol / L. Move the resulting mixture into a reaction kettle, seal it, and conduct a hydrothermal reaction at 300°C for 60 minutes under mechanical stirring. Washed several times with water and ethanol until neutral, and dried at 60°C to obtain heterostructured TiO 2 / Na 0.9 Mg 0.45 Ti 3.55 o 8 catalyst of light.

[0026] The Japanese Rigaku D / Max2550 diffractometer X-ray diffractometer, the American FEI company NovaNanoSEM-450 field emission scanning electron microscope and the FEI Tecnai G 20 Type transmission electron microscope to the heterojunction TiO prepared by embodiment 1~3 2 / Na 0.9 Mg 0.45 Ti 3.55 o 8 The structure of the photocatalyst was characterized, and the results are shown in Figure 1~6 . ...

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Abstract

The present invention discloses a heterojunction titanium dioxide / sodium magnesium titanate photocatalyst and a preparation method thereof, the heterojunction photocatalyst is prepared by hydrothermal method from MgO, TiO2 and NaOH as raw materials by adjusting the MgO concentration of the mixture for reaction at 300 ~ 320 DEG C. The preparation method is simple, the resulting photocatalyst has good homogeneity and dispersion, TiO2 and Na0.9Mg0.45Ti3.55O8 achieve lattice level matching for formation of a heterojunction, photo-induced electron- hole pair compounding during the catalytic process can be well inhibited by the formation of the heterojunction, electron- hole pair life can be prolonged, the photocatalytic activity of the complex can be significantly increased, the heterojunction titanium dioxide / sodium magnesium titanate photocatalyst applied to the treatment of common organic dye rhodamine B in industrial waste water shows fast and thorough degradation excellent properties, and compared with the pure substance Na0.9Mg0.45Ti3.55O8, the catalytic activity is significantly enhanced.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, in particular to a heterojunction TiO 2 / Na 0.9 Mg 0.45 Ti 3.55 o 8 Photocatalyst and its preparation method. Background technique [0002] Sodium magnesium titanate (Na 0.9 Mg 0.45 Ti 3.55 o 8 ) was synthesized by high-temperature solid phase in 1989, that is, MgO and TiO 2 Prepare MgTiO by reaction at 1000~1200℃ 3 and MgTiO 5 , then the MgTiO 3 , MgTiO 5 、Na 2 CO 3 The three substances are heated at 800-1000°C for 3-5 hours to prepare Na 0.9 Mg 0.45 Ti 3.55 o 8 . The method has a high reaction temperature and a long reaction time, and the prepared Na 0.9 Mg 0.45 Ti 3.55 o 8 The crystal size is large, the purity is low, and the purification is difficult. [0003] The publication number is CN104084184A Chinese invention patent application provides a kind of hydrothermal method to prepare semiconductor Na 0.9 Mg 0.45 Ti 3.55 o 8 The method, the reaction condition...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/04
Inventor 周剑平郭泽清王景州雷玉玺
Owner SHAANXI NORMAL UNIV