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Dy/BiVO4 photocatalyst as well as preparation method and application thereof

A technology of photocatalyst and reactor, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of low photogenerated electron and hole separation efficiency, photocatalytic Unsatisfactory effect, complex process and other problems, to achieve the effect of short preparation cycle, improved photocatalytic performance, and simple process flow

Active Publication Date: 2013-12-18
盐城市鹤业实业投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the low separation efficiency of photogenerated electrons and holes, the pure-phase monoclinic scheelite structure BiVO 4 The photocatalytic effect is not ideal
Doping improves BiVO 4 The photocatalytic reaction efficiency and selectivity of BiVO 4 The method of doping modification is mostly the impregnation method, that is, the pure phase BiVO is prepared by the traditional solid-state reaction method, chemical co-precipitation method, sol-gel method and hydrothermal method. 4 Finally, select the appropriate metal source and dope it by impregnation method, which has many processes and complicated process

Method used

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  • Dy/BiVO4 photocatalyst as well as preparation method and application thereof
  • Dy/BiVO4 photocatalyst as well as preparation method and application thereof
  • Dy/BiVO4 photocatalyst as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0031] A Dy / BiVO 4 Photocatalyst whose main component is BiVO 4 , is a tetragonal zircon structure, and BiVO 4 The lattice contains Dy 3+ , wherein the molar ratio of Dy element to Bi element is 2.04:100.

[0032] A Dy / BiVO 4 The preparation method of photocatalyst comprises the following steps:

[0033] Step 1: Bi(NO 3 ) 3 ·5H 2 O was dissolved in deionized water and stirred on a magnetic stirrer for 20 min to obtain Bi(NO 3 ) 3 ·5H2 Bismuth salt solution with O concentration of 0.4mol / L; NH 4 VO 3 Dissolve in deionized water at 100°C, heat and stir at 100°C for 20min to obtain NH 4 VO 3 Concentration is the vanadium salt solution of 0.4mol / L;

[0034] Step 2: slowly drop the vanadium salt solution into the bismuth salt solution according to the molar ratio of Bi and V of 1:1, and stir on a magnetic stirrer for 15 minutes to obtain a mixed solution;

[0035] Step 3: Add dropwise NaOH solution with a concentration of 5 mol / L to the mixture at a rate of 1 mL / min, ...

Embodiment 2

[0040] A Dy / BiVO 4 Photocatalyst whose main component is BiVO 4 , is a tetragonal zircon structure, and BiVO 4 The lattice contains Dy 3+ , wherein the molar ratio of Dy element to Bi element is 4.17:100.

[0041] A Dy / BiVO 4 The preparation method of photocatalyst comprises the following steps:

[0042] Step 1: Bi(NO 3 ) 3 ·5H 2 O was dissolved in deionized water and stirred on a magnetic stirrer for 20 min to obtain Bi(NO 3 ) 3 ·5H 2 Bismuth salt solution with O concentration of 0.4mol / L; NH 4 VO 3 Dissolve in deionized water at 100°C, heat and stir at 90°C for 20min to obtain NH 4 VO 3 Concentration is the vanadium salt solution of 0.4mol / L;

[0043] Step 2: slowly drop the vanadium salt solution into the bismuth salt solution according to the molar ratio of Bi and V of 1:1, and stir on a magnetic stirrer for 15 minutes to obtain a mixed solution;

[0044] Step 3: Add dropwise NaOH solution with a concentration of 5 mol / L to the mixture at a rate of 0.5 mL / mi...

Embodiment 3

[0049] A Dy / BiVO 4 Photocatalyst whose main component is BiVO 4 , is a tetragonal zircon structure, and BiVO 4 The lattice contains Dy 3+ , wherein the molar ratio of Dy element to Bi element is 6.38:100.

[0050] A Dy / BiVO 4 The preparation method of photocatalyst comprises the following steps:

[0051] Step 1: Bi(NO 3 ) 3 ·5H 2 O was dissolved in deionized water and stirred on a magnetic stirrer for 20 min to obtain Bi(NO 3 ) 3 ·5H 2 Bismuth salt solution with O concentration of 0.4mol / L; NH 4 VO 3 Dissolve in deionized water at 100°C, heat and stir at 95°C for 20min to obtain NH 4 VO 3 Concentration is the vanadium salt solution of 0.4mol / L;

[0052] Step 2: slowly drop the vanadium salt solution into the bismuth salt solution according to the molar ratio of Bi and V of 1:1, and stir on a magnetic stirrer for 15 minutes to obtain a mixed solution;

[0053] Step 3: Add dropwise NaOH solution with a concentration of 5 mol / L to the mixed solution at a rate of 0....

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Abstract

The invention relates to a Dy / BiVO4 photocatalyst as well as a preparation method and an application thereof. The Dy / BiVO4 photocatalyst comprises a principal component of BiVO4, is in a square zircon-shaped structure and contains Dy<3+> in a BiVO4 lattice. The preparation method comprises the following steps: respectively dissolving bismuth nitrate pentahydrate and ammonium metavanadate in water to obtain a bismuth salt solution and a vanadium salt solution; adding the vanadium salt solution to the bismuth salt solution to obtain a mixed solution according to the mole ratio that Bi to V is equal to 1 to1; regulating the pH value of the mixed solution to 8; then adding dysprosium nitrate hexahydrate, wherein the mole ratio of Dy to Bi is (2.04-13.64) to 100; keeping temperature at the power of 300W and the temperature of 180 DEG C for 40 minutes by adopting a microwave hydrothermal method to prepare Dy / BiVO4. The preparation method disclosed by the invention combines the advantages of microwave heating and hydrothermal methods for synthesizing powder, is high in heating speed, uniform in heating, and capable of shortening the reaction time and improving the working efficiency; the synthesized Dy / BiVO4 photocatalyst is relatively high in photocatalysis activity and can be applied to environmental pollutant treatment.

Description

technical field [0001] The invention belongs to the field of photocatalyst materials and relates to a Dy / BiVO 4 Photocatalyst and its preparation method and application. Background technique [0002] In recent years, the application of semiconductor photocatalytic oxidation method in wastewater treatment has attracted the attention of scholars. It uses the strong oxidizing free radicals generated by semiconductor photocatalysts under the condition of light to completely degrade organic pollutants and eventually generate h 2 O and CO 2 and other small inorganic molecules. The method has simple reaction equipment, less secondary pollution, easy operation control, low operation cost, and can effectively use sunlight as a reaction light source. [0003] However, BiVO 4 It is an environmentally friendly semiconductor photocatalytic material. It has three crystal structures: monoclinic scheelite type, tetragonal scheelite type and tetragonal zirconite type. Among them, BiVO u...

Claims

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Application Information

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IPC IPC(8): B01J23/22B82Y30/00A62D3/17A62D101/28A62D101/26
Inventor 谈国强罗洋洋张丽丽董国华任慧君夏傲
Owner 盐城市鹤业实业投资有限公司
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