Rare earth Tb doped bismuth vanadate photocatalyst and preparation method thereof

A photocatalyst and bismuth vanadate technology, which is applied in the field of rare earth Tb-doped bismuth vanadate photocatalyst and its preparation field, can solve problems such as complicated methods, and achieve the effect of simple and mild preparation method

Active Publication Date: 2020-12-11
PANZHIHUA UNIV
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AI Technical Summary

Problems solved by technology

[0006] Although the above technical solutions have improved BiVO to a certain extent 4 The photocatalytic efficiency of the powder, but the method is more complicated, only when it is prepared into a nanorod co-doped BiVO 4 Only photocatalysts can degrade 96% of rhodamine B after 120 minutes of simulated sunlight irradiation, and the catalytic efficiency of other solutions needs to be further improved

Method used

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  • Rare earth Tb doped bismuth vanadate photocatalyst and preparation method thereof
  • Rare earth Tb doped bismuth vanadate photocatalyst and preparation method thereof
  • Rare earth Tb doped bismuth vanadate photocatalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O) and ammonium metavanadate (NH 4 VO 3 ) in a mol ratio of 1:1, take by weighing an appropriate amount of bismuth nitrate pentahydrate and ammonium metavanadate, be dissolved in the nitric acid solution of 6mol / L and the sodium hydroxide solution of 0.5mol / L in concentration respectively, then use Stir with a magnetic stirrer to fully dissolve the two solutions, thereby obtaining colorless and transparent solution A and solution B respectively. The concentration of solution A is 0.5mol / L, and the concentration of solution B is 0.2mol / L.

[0027] Slowly add solution A to solution B dropwise, and continue to stir with a magnetic stirrer so that the two solutions of A and B are evenly mixed. In the process of gradually dropping solution A into solution B, the liquid will turn yellow when it comes into contact with it. As the amount of solution B dripped increases, the color change phenomenon of the mixed solution is as ...

Embodiment 2 to Embodiment 6

[0029] The doping methods of each embodiment are the same, and the molar ratios of terbium to bismuth vanadate in Examples 2 to 6 are 4:100, 6:100, 8:100, 10:100, and 12:100 in sequence.

[0030] The samples obtained from Example 1 to Example 6 and 0-doped pure BiVO 4 The structure of the sample is analyzed by X-ray diffractometer; the microscopic morphology of the sample is observed by scanning electron microscope; the specific surface area and average particle size are tested by Malvern laser particle size analyzer. The test of the sample adopts ultraviolet-visible spectrophotometer to test the absorbance, and calculates the photodegradation efficiency.

[0031] structural analysis

[0032] The structure of 7 samples was analyzed by X-ray diffraction (D8, Advanle1), the diffraction target was CuKα (λ=0.15056nm), the power was 40kV×50mA, the sampling width was 0.05°, and the scanning angle (2θ) range was 10° ~90°, the test is carried out at room temperature (25°C).

[0033...

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Abstract

The invention discloses a rare earth Tb doped bismuth vanadate photocatalyst and a preparation method thereof. The preparation method comprises the following steps: dissolving bismuth nitrate pentahydrate in a nitric acid solution to obtain a solution A; dissolving ammonium metavanadate into a sodium hydroxide solution to obtain a solution B; slowly dropwise adding the solution A into the solutionB, and uniformly performing stirring to obtain a bismuth vanadate suspension; dropwise adding the terbium chloride solution into the bismuth vanadate suspension to obtain terbium-doped bismuth vanadate suspension, continuously performing stirring, adjusting the pH value to 6 by using a sodium hydroxide solution, carrying out water bath at 80-90 DEG C for at least 1h, performing cooling, carryingout suction filtration to obtain a precipitate, drying, performing calcining at 480-520 DEG C for at least 4h, performing cooling, and grinding theprecipitate into powder to obtain the rare earth Tb-doped bismuth vanadate photocatalyst. The photodegradation efficiency of the rare earth Tb doped bismuth vanadate photocatalyst reaches up to 99%, a liquid phase precipitation method is adopted, and the preparation method is simple and mild.

Description

technical field [0001] The invention relates to a bismuth vanadate photocatalyst, more specifically, the invention relates to a rare earth Tb-doped bismuth vanadate photocatalyst and a preparation method thereof. Background technique [0002] Bismuth vanadate (BiVO 4 ) is a new type of semiconductor photocatalyst with visible light activity, which can directly use sunlight to completely degrade organic pollutants, and is widely used in the photocatalytic degradation of organic pollutants in water. Bismuth vanadate has the disadvantages of small specific surface area, poor adsorption performance, and easy recombination of photogenerated electrons to reduce photocatalytic activity. The photocatalytic activity can be improved by modifying bismuth vanadate. [0003] There are three main crystal types of bismuth vanadate: monoclinic scheelite type (m phase), tetragonal zircon type (z-t phase) and tetragonal scheelite type (s-t phase), although there are relatively similar crysta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22
CPCB01J23/22B01J35/004Y02W10/37
Inventor 张泽兰刘景景赵伟
Owner PANZHIHUA UNIV
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