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Preparation and catalytic performance of an intercalated polyacid-based metal-organic framework
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An organic framework and metal-based technology, which is applied in the field of preparation and catalytic performance of polyacid-based metal-organic frameworks, can solve the problems of high difficulty and low recycling rate, and achieve catalytic activity, stable structure, and favorable photocatalytic effect Effect
Active Publication Date: 2022-03-08
HARBIN UNIV OF SCI & TECH
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[0006] The purpose of the present invention is to solve the difficulty of synthesizing polyacid-based metal-organic framework crystal materials with nanopores using the prior art and the problems that traditional polyacids are easily soluble in water and low in recycling rate as catalysts, and provide an intercalation Preparation method and properties of multi-acid-based metal-organic frameworks
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specific Embodiment approach 1
[0028] Specific implementation mode 1: This implementation mode is a polyacid-based metal-organic framework material with an intercalation structure whose chemical formula is [Cu I 2 Cu II 5 (ptz) 6 (OH) 2 (4H 2 O)GeW 12 o 40 ]·6H 2 O, wherein, ptz is 5-(pyridin-2-yl)tetrazolium; crystal system is triclinic; space group is P-1; unit cell parameters are α=100.244(5), β=91.097(5), γ=111.053(5), z=1.
[0029] The [Cu I 2 Cu II 5 (ptz) 6 (OH) 2 (4H 2 O)GeW 12 o 40 ]·6H 2 Cu in OI The valence is +1, the coordination mode is 4 coordination, Cu II The valence is +2, and the coordination mode is 6 coordination.
[0030] Compared with the prior art, this embodiment has the following characteristics:
[0031] The present invention adopts a simple one-step hydrothermal synthesis method. The present invention adopts a simple one-step hydrothermal synthesis method, and for the first time successfully prepared A polyacid-based metal organic framework material wit...
specific Embodiment approach 2
[0032] Specific implementation mode 2: This implementation mode is a polyacid-based metal-organic framework material with an intercalation structure, which is completed according to the following steps:
[0033] 1. Prepare a reaction solution with a pH value of 3.5: dissolve germanium tungstic acid, copper chloride, and 5-(pyridin-2-yl)tetrazolium organic ligand into deionized water to obtain a reaction solution; Adjust to 3.5 to obtain a reaction solution with a pH value of 3.5;
[0034] The molar ratio of the germanium tungstic acid described in the step 1 and the metal copper salt is: 0.1:(0.2~1);
[0035] The molar ratio of the germanium tungstic acid described in step 1 to the tetrazolium-containing organic ligand is: 0.1:(0.2~0.5);
[0036] The volume ratio of the amount of germanotungstic acid described in step 1 to distilled water is: 0.1mmol: (20ml~35ml);
[0037] 2. Add the reaction solution with a pH value of 3.5 into the polytetrafluoroethylene reactor, react at ...
specific Embodiment approach 3
[0041] Embodiment 3: The difference between this embodiment and Embodiment 2 is that the metal copper salt described in step 1 is copper chloride, copper nitrate or copper acetate. Others are the same as in the second embodiment.
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Abstract
The purpose of the present invention is to develop a polyacid-based metal-organic framework crystal material with an intercalation structure, which can effectively overcome the wide band gap (>3eV) of simple polyacid materials, can only absorb ultraviolet light, is easily soluble in water, and has a high recycling rate. No advanced technical bottleneck, using its special intercalation structure characteristics to improve the electron storage capacity of polyacid as an electron acceptor, accelerate the separation of catalytic photogenerated carriers, improve the photocatalytic efficiency of the catalyst, thereby expanding its spectral absorption range to visible light . The present invention designs and develops a polyacid-based metal-organic framework crystal material with an intercalation structure whose chemical formula is [Cu I 2 Cu II 5 (ptz) 6 (OH) 2 (4H 2 O)GeW 12 o 40 ]·6H 2 O. Method: Dissolve germanium tungstic acid, copper chloride, and 5-(pyridine-2-yl)tetrazolium organic ligand into deionized water to obtain a reaction solution, adjust the pH value, and then react at a temperature of 160°C for 3 days . The invention can obtain a metal-organic framework crystal material with a multi-acid group intercalation structure with visible light catalytic performance.
Description
technical field [0001] The invention relates to the preparation and catalytic performance of a polyacid-based metal-organic framework with an intercalation structure Background technique [0002] Polyoxometalates (POMs) is the abbreviation of polyoxometalates. It has been an important development field in inorganic chemistry. It is a class of nano-sized polyoxometalates with a clear structure. Both can be regulated, and can perform fast, reversible, step-by-step multi-electron transfer in chemical reactions without changing its structure. Therefore, polyacids have been widely used in magnetic materials, optoelectronic materials, pharmaceuticals, and catalytic reactions. [0003] Solar energy is a new type of energy that is clean, renewable and widely available. The increasing scarcity of fossil fuels and the environmental problems caused by their use have made people more and more interested in the development and utilization of solar energy, among which the conversion of ...
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