Y/BiVO4 composite photocatalyst, and preparation method and application thereof

A technology of catalyst and composite light, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of low separation efficiency of photogenerated electrons and holes, unsatisfactory photocatalytic effect, and complicated process. , to achieve the effect of short reaction time, improved photocatalytic efficiency and simple process

Active Publication Date: 2015-07-08
盐城青墩津邦水务有限公司
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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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  • Y/BiVO4 composite photocatalyst, and preparation method and application thereof
  • Y/BiVO4 composite photocatalyst, and preparation method and application thereof
  • Y/BiVO4 composite photocatalyst, and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A Y / BiVO 4 Composite photocatalyst whose main component is BiVO 4 , is a tetragonal zircon phase structure, and BiVO 4 The lattice contains Y 3+ , wherein the molar ratio of Y element to Bi element is 2.04:100.

[0033] A Y / BiVO4 The preparation method of composite photocatalyst comprises the following steps:

[0034] 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 100°C for 20min to obtain NH 4 VO 3 Concentration is the vanadium salt solution of 0.4mol / L;

[0035] 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;

[0036] Step 3: Add dropwise NaOH solution with a concentration of 5 mol / L to the mixture a...

Embodiment 2

[0041] A Y / BiVO 4 Composite photocatalyst whose main component is BiVO 4 , is a tetragonal zircon phase structure, and BiVO 4 The lattice contains Y 3+ , wherein the molar ratio of Y element to Bi element is 4.17:100.

[0042] A Y / BiVO 4 The preparation method of composite photocatalyst comprises the following steps:

[0043] 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;

[0044] 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;

[0045] Step 3: Add dropwise NaOH solution with a concentration of 5 mol / L to the mixture ...

Embodiment 3

[0050] A Y / BiVO 4 Composite photocatalyst whose main component is BiVO 4 , is a tetragonal zircon phase structure, and BiVO 4 The lattice contains Y 3+ , wherein the molar ratio of Y element to Bi element is 6.38:100.

[0051] A Y / BiVO 4 The preparation method of composite photocatalyst comprises the following steps:

[0052] 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;

[0053] 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;

[0054] Step 3: Add dropwise NaOH solution with a concentration of 5 mol / L to the mixed so...

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Abstract

The invention relates to a Y / BiVO4 composite photocatalyst, and a preparation method and an application thereof. The main component of the Y / BiVO4 composite photocatalyst is BiVO4, the BiVO4 has a tetragonal zircon phase structure, and the crystal lattice of the BiVO4 contains Y<3+>. 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 according to a molar ratio of Bi to V of 1:1 to obtain a mixed solution, adjusting the pH value of the mixed solution to 8, adding yttrium nitrate hexahydrate according to a molar ratio of Y to Bi of (2.04-13.64):100, and maintaining the temperature at 180DEG C unchanged for 40min under a power of 300W by using a microwave hydrothermal method to prepare the Y / BiVO4 composite photocatalyst. The preparation method which allows the Y / BiVO4 composite photocatalyst to be synthesized through a one-step process has the advantages of simple flow, simple operation and mild reaction condition, and the synthesized Y / BiVO4 composite photocatalyst has a high photocatalytic activity and can be used for degrading environmental pollutants.

Description

technical field [0001] The invention belongs to the field of functional materials, in particular to a Y / BiVO 4 Composite photocatalyst and its preparation method and application. Background technique [0002] At present, photocatalysis technology has two remarkable features: on the one hand, photocatalysis technology is a low-temperature deep reaction technology, and photocatalysis can completely oxidize organic pollutants in water into non-toxic CO at room temperature. 2 and H 2 O and other harmless products; on the other hand, photocatalytic technology can use sunlight as a light source to activate photocatalysts, drive oxidation-reduction reactions, and achieve the purpose of purifying pollutants. [0003] Because a single compound photocatalyst requires near-ultraviolet light activation when initiating chemical reactions, it can only use about 4% of sunlight, and often has defects such as high recombination probability of photogenerated carriers and narrow light absorp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/22B01J37/34B01J37/10C02F1/32C02F101/38
Inventor 谈国强罗洋洋张丽丽董国华任慧君夏傲
Owner 盐城青墩津邦水务有限公司
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