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Preparation and application of Nd<3-x>CoxNbO7-zincosilicate molecular sieve composite porous nanometer catalytic material

A nano-catalytic material, silicon-zinc molecular sieve technology, applied in molecular sieve catalysts, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of increasing drug-resistant strains, expanding the scope of harm, and health hazards And other issues

Active Publication Date: 2015-05-27
NANJING UNIV
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  • Claims
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Problems solved by technology

In recent years, the unreasonable application of sulfonamides has brought adverse consequences, resulting in the increase of drug-resistant strains, and the residues of sulfonamides in animal foods. Most of these sulfonamides will eventually transfer through water bodies, expanding the scope of harm, and endangering people's health. Potential harm has aroused great attention at home and abroad

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  • Preparation and application of Nd&lt;3-x&gt;CoxNbO7-zincosilicate molecular sieve composite porous nanometer catalytic material
  • Preparation and application of Nd&lt;3-x&gt;CoxNbO7-zincosilicate molecular sieve composite porous nanometer catalytic material
  • Preparation and application of Nd&lt;3-x&gt;CoxNbO7-zincosilicate molecular sieve composite porous nanometer catalytic material

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preparation example Construction

[0039] (1) Preparation of silicon-zinc molecular sieves: in an alkaline state, the molar composition ratio of SiO 2 / ZnO=5 / 45 Add zinc oxide and citric acid complexing agent to the silicate solution. The role of the complexing agent is to maintain the stability of zinc in alkaline solution and colloid through the complexation of the complexing agent and zinc ions, inhibit the formation of zinc oxide or hydroxide, and increase the zinc content of the molecular sieve framework and molecular sieve crystallinity. Then, after hydroheating for 5 hours, filter and dry, and then crush and screen to obtain the desired silicon-zinc molecular sieve. This zeolite has high crystallinity, and it is confirmed by XRD and FTIR that zinc enters the framework of the molecular sieve.

[0040] (2) Composite Nd by dipping and baking method 3-x co x NbO 7 (0.5≤x≤1)-silicon-zinc molecular sieve process route: weigh a certain amount of Nd 3-x co x NbO 7 (0.5≤x≤1) The catalyst was dissolved in ...

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Abstract

According to the invention, a powder catalytic material Nd<3-x>CoxNbO7 (x being greater than or equal to 0.5 and less than or equal to 1) is prepared by adopting a supercritical hydrosynthesis method and a chemical vapor condensation and deposition method; a composite porous nanometer catalytic material Nd<3-x>CoxNbO7 (x being greater than or equal to 0.5 and less than or equal to 1) -zincosilicate molecular sieve is prepared by adopting an impregnating and baking method; and a novel photoelectrode Nd<3-x>CoxNbO7 (x being greater than or equal to 0.5 and less than or equal to 1) is prepared. The three novel materials are represented: tissue morphology analysis is performed by a transmission electron microscopy, and results show that catalyst particles are irregular in shape, with the average particle size of 150 nm; phase analysis is performed by an X-ray diffractometer, and results show that Nd2CoNbO7 has a single phase, and relatively high crystallinity; the chemical speciation of the surface of the catalyst and the elementary composition of a microcell as well as the structural characteristics of an electronic shell are discussed by an X-ray photoelectron spectroscopy; and a characteristic absorption edge of the Nd2CoNbO7 is determined by a UV-Vis diffuse reflection spectroscopy to obtain the band gap width of the Nd2CoNbO7 which is 2.412 eV. Finally, the catalyst is used for decomposing water to produce hydrogen, and carrying out catalytic degradation on organic pollutants such as microcystic toxins, methylene blue and sulfamethoxazole in a water body under visible light. Experimental results show that the catalyst prepared according to the invention is good in catalytic effect.

Description

technical field [0001] The invention relates to two novel photocatalysts and a novel photoelectrode, which are respectively powder catalytic materials Nd 3-x co x NbO 7 (0.5≤x≤1), composite porous nanocatalytic material Nd 3-x co x NbO 7 (0.5≤x≤1)-Silicon Zinc Molecular Sieve and New Photoelectrode Nd 3-x co x NbO 7 (0.5≤x≤1). The content of the invention includes the preparation, characterization and application of these three new materials, and the applications include photocatalytic removal of organic pollutants in water bodies and photocatalytic decomposition of water to produce hydrogen. Background technique [0002] In the past 300 years, starting from the British Industrial Revolution, human society has developed rapidly in all aspects. However, behind the substantial economic growth, energy has been over-exploited and the environment has also been threatened unprecedentedly. In order to deal with the dual crises of energy and environment, many measures have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/847B01J29/04C02F1/30C01B3/04
CPCY02W10/37Y02E60/36Y02P20/54
Inventor 栾景飞李妍妍陈梦静
Owner NANJING UNIV
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