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Ag3PO4/Mg-Al LDO (Layered Double Oxide) visible light composite photo catalyst, preparation and application thereof

A composite photocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems that have not been reported before, and achieve environmental friendliness, easy industrial production, and strong adsorption performance Effect

Inactive Publication Date: 2011-08-17
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] But so far, the Ag 3 PO 4 There are no relevant reports on the literature and patents on the modification of Mg-Al LDO by nanoparticles

Method used

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  • Ag3PO4/Mg-Al LDO (Layered Double Oxide) visible light composite photo catalyst, preparation and application thereof
  • Ag3PO4/Mg-Al LDO (Layered Double Oxide) visible light composite photo catalyst, preparation and application thereof
  • Ag3PO4/Mg-Al LDO (Layered Double Oxide) visible light composite photo catalyst, preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] At room temperature, weigh 76.24g of magnesium chloride hexahydrate and 45.27g of aluminum chloride hexahydrate into 262.5ml of water, and stir until completely dissolved to obtain a mixed salt solution. Separately weigh 52.5g of sodium hydroxide and 66.38g of sodium carbonate into 375ml of water and stir until completely dissolved to obtain a mixed alkali solution. Pour the mixed alkali solution into a three-necked flask, place it in an oil bath, heat the oil bath to 50°C, and use three constant pressure droppers to add the mixed salt solution to the mixed alkali solution drop by drop. After the dropwise addition, the oil bath was heated to 90°C and kept for 4h. After the incubation, wash with deionized water and absolute ethanol 6 times and 2 times, respectively, and dry at 90 °C for 24 h to obtain Mg-Al-CO 3 LDH.

Embodiment 2

[0031] At room temperature, weigh 4.8g of disodium hydrogen phosphate dodecahydrate and add it to 150ml of water, stir until completely dissolved, then weigh 3g of the Mg-Al-CO prepared in Example 1 3 LDH was added to the above solution, and the suspension was stirred for 10 min. Weigh 2.3g of silver nitrate and add it into 50ml of water, and stir until completely dissolved in the dark, then add to the above suspension, and stir at room temperature for 24h in the dark. After the reaction, wash with distilled water for 6 times, and dry at 70°C for 24 hours. Calcinate the powder in air at 400°C for 4h to obtain Ag 3 PO 4 / Mg-Al LDO(Ag 3 PO 4 wt% = 50%).

[0032] figure 1 Ag prepared for this example 3 PO 4 X-ray diffraction pattern of / Mg-Al LDO, the Ag shown in the figure 3 PO 4 The characteristic peaks are very obvious, and at the same time, the characteristic peaks of elemental Ag also appear, indicating that Ag 3 PO 4 The chemical environment of Ag in the compos...

Embodiment 3

[0034] At room temperature, weigh 1.6g of disodium hydrogen phosphate dodecahydrate and add it to 150ml of water, stir until completely dissolved, then weigh 3g of the Mg-Al-CO prepared in Example 1 3 LDH was added to the above solution, and the suspension was stirred for 10 min. Weigh 0.77g of silver nitrate and add it into 50ml of water, and stir until completely dissolved in the dark, then add it to the above suspension, and stir at room temperature for 24 hours in the dark. After the reaction, wash with distilled water for 6 times, and dry at 70°C for 24 hours. Calcinate the powder in air at 400°C for 4h to obtain Ag 3 PO 4 / Mg-Al LDO(Ag 3 PO 4 wt% = 25%).

[0035] figure 2 The Ag prepared in this example is given 3 PO 4 / Mg-Al LDO(Ag 3 PO 4 wt%=25%) ultraviolet-visible light diffuse reflectance spectrum, the composite catalyst has strong absorption in the visible light region.

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Abstract

The invention relates to an Ag3PO4 / Mg-Al LDO (Layered Double Oxide) visible light composite photo catalyst, preparation and application thereof. The photo catalyst comprises Ag3PO4 nanometer particles and magnesium-aluminum double metal oxides Mg-Al LDO with a mass ratio of 1:10 to 5:1. A preparation method comprises the following steps of: dispersing magnesium-aluminum layered double hydroxides obtained by a co-precipitation method into the solution of soluble phosphate, adding a silver nitrate solution, stirring for 4-24 hours, washing and roasting to obtain the Ag3PO4 / Mg-Al LDO visible light composite photo catalyst. The photo catalyst is applied to degrading and removing of anion pollutants in dye waste water. While maintaining the characteristic of strong adsorptive property of an adsorbent, the Ag3PO4 / Mg-Al LDO visible light composite photo catalyst also has higher visible light catalytic activity so as to have good application prospect in the purification and treatment field ofthe dye waste water; and the preparation technology and production equipment are simple, environmentally friendly, and easy for industrial production.

Description

technical field [0001] The invention belongs to the field of visible light composite photocatalysts, in particular to an Ag 3 PO 4 / Mg-Al LDO visible light composite photocatalyst and its preparation and application. Background technique [0002] In 1972, Fujishima and Honda discovered that TiO 2 As a photoanode, it can catalyze the decomposition of H under ultraviolet light 2 O produces H 2 and O 2 The phenomenon marks the beginning of a new era in the research of heterogeneous photocatalysis. For more than 30 years, photocatalysis has been a popular science in the research field. But since TiO 2 The limitation of its own bandgap width makes it only able to absorb ultraviolet light, which accounts for only a small part of sunlight, and has no response to visible light, which accounts for most of sunlight. Therefore, in the following two decades, the research objects mainly focused on the TiO 2 Modification aspects, such as transition metal doping, non-metal doping ...

Claims

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Application Information

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IPC IPC(8): B01J27/18C02F1/28C02F1/30
Inventor 张青红崔显炉王宏志李耀刚
Owner DONGHUA UNIV
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