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Ag-(010) crystal face BiVO4 photocatalyst and preparation method thereof

A photocatalyst, crystal face technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. high, photo-generated carriers are difficult to migrate, etc., to achieve good application prospects and simple operation.

Inactive Publication Date: 2018-11-02
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, BiVO 4 The catalyst has problems such as small specific surface area, low utilization rate of light quantum, high recombination probability of electrons and holes, poor adsorption performance, and difficult migration of photogenerated carriers. The researchers proposed that BiVO can be improved in two ways. 4 The photocatalytic performance, one is to improve the BiVO 4 The activity itself, such as increasing the crystallinity, improving the morphology, increasing the exposure of highly active crystal planes, etc.

Method used

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  • Ag-(010) crystal face BiVO4 photocatalyst and preparation method thereof
  • Ag-(010) crystal face BiVO4 photocatalyst and preparation method thereof
  • Ag-(010) crystal face BiVO4 photocatalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0021] Step 1: Add Bi(NO 3 ) 3 ·5H 2 O dissolved in dilute HNO with a concentration of 1mol / L 3 Add NH after stirring for 30min 4 VO 3 , Stirred for 120 min to form precursor liquid A; among them Bi(NO 3 ) 3 ·5H 2 O and NH 4 VO 3 The molar ratio is 1:1, Bi in precursor A 3+ The concentration is 0.1mol / L;

[0022] Step 2: Hydrothermally react the precursor solution A at 70°C for 15 hours. After the reaction, the precipitate is washed and dried at 70°C for 9 hours to obtain a monoclinic phase with exposed (010) crystal plane and (110) crystal plane. The spatial structure group is BiVO for I2 / a 4 Surface heterojunction powder;

[0023] Step 3, the (010) crystal plane BiVO 4 The powder is dissolved in deionized water to obtain BiVO with a concentration of 6.25g / L 4 Aqueous solution, press AgNO 3 The quality is BiVO 4 5% to BiVO 4 Add AgNO to the aqueous solution 3 Dissolve in BiVO under dark state and stirring 4 In the aqueous solution, the precursor liquid B is prepared;

[0024] Step 4...

Embodiment 2

[0026] Step 1: Add Bi(NO 3 ) 3 ·5H 2 O dissolved in dilute HNO with a concentration of 1mol / L 3 Medium, add NH after stirring for 10min 4 VO 3 , Stirred for 100min to form precursor liquid A; where Bi(NO 3 ) 3 ·5H 2 O and NH 4 VO 3 The molar ratio is 1:1, Bi in precursor A 3+ The concentration is 0.2mol / L;

[0027] Step 2: Hydrothermally react the precursor solution A at 80°C for 14h. After the reaction, wash the precipitate and dry it at 60°C for 10h to obtain a monoclinic phase with exposed (010) crystal plane and (110) crystal plane. The spatial structure group is BiVO for I2 / a 4 Surface heterojunction powder;

[0028] Step 3, the (010) crystal plane BiVO 4 The powder is dissolved in deionized water to obtain BiVO with a concentration of 6.25g / L 4 Aqueous solution, press AgNO 3 The quality is BiVO 4 10% to BiVO 4 Add AgNO to the aqueous solution 3 Dissolve in BiVO under dark state and stirring 4 In the aqueous solution, the precursor liquid B is prepared;

[0029] Step 4. Put the ...

Embodiment 3

[0031] Step 1: Add Bi(NO 3 ) 3 ·5H 2 O dissolved in dilute HNO with a concentration of 2mol / L 3 Medium, add NH after stirring for 50min 4 VO 3 , Stirred for 140min to form precursor liquid A; where Bi(NO 3 ) 3 ·5H 2 O and NH 4 VO 3 The molar ratio is 1:1, Bi in precursor A 3+ The concentration is 0.3mol / L;

[0032] Step 2: Hydrothermally react the precursor solution A at 85°C for 13 hours. After the reaction, the precipitate is washed and dried at a constant temperature of 80°C for 8 hours to obtain a monoclinic phase with exposed (010) crystal plane and (110) crystal plane. The spatial structure group is BiVO for I2 / a 4 Surface heterogeneous powder;

[0033] Step 3, the (010) crystal plane BiVO 4 The powder is dissolved in deionized water to obtain BiVO with a concentration of 6.25g / L 4 Aqueous solution, press AgNO 3 The quality is BiVO 4 15% to BiVO 4 Add AgNO to the aqueous solution 3 Dissolve in BiVO under dark state and stirring 4 In the aqueous solution, the precursor liquid B...

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Abstract

The invention discloses an Ag-(010) crystal face BiVO4 photocatalyst and a preparation method thereof. A hydrothermal method is used for preparing a monoclinic phase BiVO4 with the (010) exposed crystal face, then a photoreduction method is used for reducing AgNO3 to Ag which precipitates on the (010) crystal face of the BiVO4, and thus the Ag-(010) crystal face BiVO4 photocatalyst is prepared. Agis used as an electronic mediator, which is beneficial to transferring and separation of electrons and vacancies, and meanwhile, Ag has an SPR effect, so that light absorption of the near infrared region (750-1500 nm) is improved, thus the photocatalyst can be applied to the aspect of catalytic degradation of organic matters in the visible region and the near infrared region.

Description

Technical field [0001] The invention belongs to the field of functional materials, and relates to an Ag-(010) crystal plane BiVO 4 Photocatalyst and its preparation method. Background technique [0002] BiVO 4 There are three main crystal structures, namely tetragonal scheelite structure, monoclinic scheelite structure and tetragonal zircon structure. The tetragonal phase mainly has an absorption band in the ultraviolet region, while the monoclinic BiVO 4 In addition to the absorption band in the ultraviolet region, there is also an obvious absorption band in the visible region. Because of its narrow energy gap and high visible light catalytic activity, it is widely used in the field of photocatalysis. However BiVO 4 The catalyst has problems such as small specific surface area, low photon utilization rate, high probability of electron and hole recombination, poor adsorption performance, and difficulty for photogenerated carriers to migrate. The researchers proposed that BiVO ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/68C02F1/30C02F101/38
CPCC02F1/30B01J23/682C02F2305/10C02F2101/38B01J35/39
Inventor 谈国强李斌党明月王颖王敏张丹任慧君夏傲
Owner SHAANXI UNIV OF SCI & TECH