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Preparation method of visible-light catalyst

A visible light and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of single-phase structure cycle stability and poor ability to degrade methyl orange, and achieve photocatalytic activity optimization , Improve catalytic activity, good interfacial lattice matching effect

Inactive Publication Date: 2014-09-03
CHINA UNIV OF MINING & TECH
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Problems solved by technology

Currently, Ag 3 PO 4 Significant progress has been made in the preparation of crystals, but the single-phase structure has poor cycle stability and poor ability to degrade methyl orange.
However, there is no research on silver phosphate Ag 3 PO 4 with cobalt phosphate Co 3 (PO 4 ) 2 A report on the composite photocatalyst

Method used

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  • Preparation method of visible-light catalyst
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  • Preparation method of visible-light catalyst

Examples

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Embodiment 1

[0023] Embodiment 1: the preparation method of visible light catalyst of the present invention, used material is cobalt phosphate-based composite semiconductor photocatalyst, is made of cobalt phosphate Co 3 (PO 4 ) 2 Nanosheets and silver phosphate Ag 3 PO 4 Nanoparticle composition, silver phosphate, Ag 3 PO 4 Nanoparticles uniformly loaded on cobalt phosphate Co 3 (PO 4 ) 2 On the nanosheet; the cobalt phosphate Co 3 (PO 4 ) 2 The thickness of nanosheets is 100-200nm, silver phosphate Ag 3 PO 4 The particle size of nanoparticles is 200-500nm;

[0024] The preparation method adopts a chemical segregation method, comprising the following steps:

[0025] a) Prepare silver nitrate and cobalt nitrate mixed aqueous solution: weigh 0.1105g silver nitrate powder and 0.1855g cobalt nitrate powder and dissolve them in 100g deionized water to obtain a mixed aqueous solution of the two; the mass percentage concentrations of silver nitrate and cobalt nitrate are 0.1105 % a...

Embodiment 2

[0028] Embodiment 2: the preparation method of visible light catalyst:

[0029] a) Preparation of silver nitrate and cobalt nitrate mixed aqueous solution: weigh 0.051g silver nitrate powder and 0.081g cobalt nitrate powder and dissolve them in 100g deionized water to obtain a mixed aqueous solution, wherein the mass percentage concentration of silver nitrate is 0.05%, and the concentration of cobalt nitrate The mass percentage concentration is 0.08%;

[0030] b) Preparation of diammonium hydrogen phosphate aqueous solution: weigh 0.087g of diammonium hydrogen phosphate powder and dissolve it in 50g of deionized water to obtain a diammonium hydrogen phosphate aqueous solution with a concentration of 0.194%;

[0031] c) Preparation of visible light catalyst: the above-mentioned diammonium hydrogen phosphate solution with a mass percentage concentration of 0.194% is added dropwise to a mixed aqueous solution of silver nitrate and cobalt nitrate, wherein the mass percentage conce...

Embodiment 3

[0032] Embodiment 3: the preparation method of visible light catalyst:

[0033] First, prepare 100g of silver phosphate AgNO with mass percent concentration of 0.17% and 0.29% respectively 3 and cobalt phosphate Co(NO 3 ) 3 aqueous solution, mix the two. It is 0.388% (NH 4 ) 2 HPO 4 100g of aqueous solution, magnetically stirred for 10h, centrifuged to separate the precipitate, washed repeatedly with deionized water and absolute ethanol several times after centrifuged, dried in vacuum to obtain silver phosphate / cobalt phosphate nanocomposite visible light catalyst. Others are the same as in Example 1.

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Abstract

The invention relates to a preparation method of a visible-light catalyst, and belongs to preparation methods of catalysts. The visible-light catalyst is of a composite structure of cobalt phosphate Co3(PO4)2 nanosheets and silver phosphate Ag3PO4 nanoparticless and is prepared by adopting a chemical segregation method which comprises the following steps of preparing a mixed solution of silver nitrate AgNO3 and cobalt nitrate Co(NO3)3 in advance, and then dropwise adding a diammonium hydrogen phosphate (NH4)2HPO4 solution until a large amount of precipitation is generated. In the process of degrading methyl orange by visible light, compared with pure silver phosphate Ag3PO4 with the same quality, the composite structure has the advantage that both the stability and the photooxidation activity are obviously improved. The composite structure can be used for processing and degrading dye wastewater such as methyl orange and photolyzing water to prepare hydrogen or oxygen, and when sunlight is captured, photon-generated carriers are effectively promoted to transfer. The composite structure has the advantages of large effective surface area, simplicity in synthesis and good interfacial lattice matching and is favorable for improving the catalytic activity, and the photocatalytic activity can be further optimized by controlling the proportion of two components.

Description

technical field [0001] The invention relates to a preparation method of a catalyst, in particular to a preparation method of a visible light catalyst. Background technique [0002] Solar energy is a clean, abundant and inexhaustible resource with broad application prospects. One of the important uses is solar photocatalysis. It includes two types of photolysis of water and photodegradation, that is, using semiconductors to capture sunlight to decompose water or degrade pollutants. The most common photocatalyst is TiO 2 , it has the advantages of stable chemical properties, low cost, large surface area, etc., but the wide band gap makes it only able to use a very small part of ultraviolet light in sunlight. [0003] Ag 3 PO 4 Due to its bandgap width of 2.37eV at room temperature and high quantum yield of 90%, it is considered as an ideal visible light catalyst material. Currently, Ag 3 PO 4 Significant progress has been made in the preparation of crystals, but the si...

Claims

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Application Information

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IPC IPC(8): B01J27/185B82Y30/00B82Y40/00
Inventor 顾修全张双强颖怀朱磊赵宇龙
Owner CHINA UNIV OF MINING & TECH
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