A visible light-responsive tb/bivo 4 Catalyst and its preparation method and application

A catalyst and visible light technology, applied in the field of visible light responsive Tb/BiVO4 catalyst and its preparation, can solve problems such as low catalytic efficiency, and achieve the effects of simple process flow, mild reaction conditions and no hysteresis effect

Active Publication Date: 2016-08-10
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the pure monoclinic BiVO 4 There are problems such as low catalytic efficiency and selectivity under visible light. Therefore, trying to modify it to improve its catalytic efficiency under visible light is the common goal of most researchers.

Method used

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  • A visible light-responsive tb/bivo <sub>4</sub> Catalyst and its preparation method and application
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  • A visible light-responsive tb/bivo <sub>4</sub> Catalyst and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0032] A Visible Light Responsive Tb / BiVO 4 The preparation method of catalyst 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 ·5H 2 Bismuth salt solution with O concentration of 0.4mol / L; NH 4 VO3 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 ...

Embodiment 2

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

[0041] A Visible Light Responsive Tb / BiVO 4 The preparation method of catalyst 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...

Embodiment 3

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

[0050] A Visible Light Responsive Tb / BiVO 4 The preparation method of catalyst 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...

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Abstract

The invention provides a visible-light response Tb / BiVO4 catalyst and a preparation method and application thereof. The visible-light response Tb / BiVO4 catalyst mainly comprises BiVO4 and adopts a square zircon phase structure, and the crystal lattice of BiVO4 contains Tb<3+>. Bismuth nitrate pentahydrate and ammonium metavanadate are respectively dissolved in water to obtain a bismuth salt solution and a vandic salt solution, the vandic salt solution is added to the bismuth salt solution to obtain a mixed solution according to the molar ratio 1: 1 of Bi and V, the pH value of the mixed solution is adjusted to 8, then terbium nitrate hexahydrate is added, the molar ratio of Tb and Bi is (2.04-13.64):100, and performing 40 min heat insulation at the power of 300 W and the temperature of 180 DEG C through the microwave hydrothermal method to prepare the visible-light response Tb / BiVO4 catalyst. The heating speed is high, the heating is uniform, the reaction time is shortened, the working efficiency is improved, and the synthesized visible-light response Tb / BiVO4 catalyst has higher photocatalytic activity and can be used for environmental pollutant treatment.

Description

technical field [0001] The invention belongs to the field of photocatalyst materials and relates to a visible light responsive Tb / BiVO 4 Catalyst and its preparation method and application. Background technique [0002] Nano-semiconductor materials are widely used in systems such as water splitting, elimination of radioactive pollution, organic synthesis, and activation of dyes under solar energy, among which the most widely studied is the wide-bandgap semiconductor TiO 2 . But TiO 2 The band gap is wide (3.2eV), the range of spectral effects is narrow, and the light absorption wavelength is mainly concentrated in the ultraviolet region (387.5nm). constraints. Therefore, it is very important to develop semiconductors that respond in the visible light range. The goal of developing new photocatalysts is mainly to overcome TiO 2 Based on the inherent shortcomings of base photocatalysts that cannot work efficiently under visible light irradiation, we are trying to prepare ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/22A62D3/17
Inventor 谈国强罗洋洋张丽丽董国华任慧君夏傲
Owner SHAANXI UNIV OF SCI & TECH
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