Sodium niobate nanowire photocatalyst and preparation method thereof

A technology of photocatalyst and sodium niobate, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve limited problems and achieve simple process and short process , The effect of stable product quality

Inactive Publication Date: 2012-09-12
JIANGNAN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, such research is still very limited at present. We try to improve the photocatalytic activity by controlling the one-dimensional nanostructure

Method used

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  • Sodium niobate nanowire photocatalyst and preparation method thereof
  • Sodium niobate nanowire photocatalyst and preparation method thereof

Examples

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example 1

[0019] Granular NaNbO was synthesized by solid phase method 3 , the Nb 2 o 5 and Na 2 CO 3 The solid powder is mixed according to the stoichiometric ratio of the reaction, the solid powder is added with absolute ethanol and ground in an agate mortar, calcined at 800°C for 4h, taken out and reground, and then calcined at 900°C for 5h. In a typical example, NaNbO is added to a methanolic solution 3 The powder and chloroplatinic acid were irradiated by a 400W high-pressure mercury lamp for 1 hour, and the obtained precipitate was filtered, washed with distilled water and ethanol, and dried in an oven at 70° C. for 12 hours. Place the solid-phase synthesized photocatalytic material sample on the sample stage in the reactor and spread it flat, and then inject CO into the reaction system after vacuuming the system. 2 (about 1 atm), then use a syringe to add water (0.4ml), keep the reactor away from light for 10h, use the gas circulation pump to make the photocatalytic reaction ...

example 2

[0021] In a typical example, 1 g of P123 was added to 25 ml of distilled water, and 5 g of Nb(OC 2 h 5 ) 5 . 10 ml of a 0.8 g / ml sodium hydroxide solution was added dropwise. After stirring for one hour, the resulting solution was transferred to an autoclave and heat-treated at 200 °C for 24 hours. The resulting precipitate was filtered, washed with distilled water and ethanol, and dried overnight in an oven at 70°C. The obtained powders were calcined at 550° C. for 4 hours, and returned to room temperature by natural cooling. In a typical example, NaNbO is added to a methanolic solution 3 The powder and chloroplatinic acid were irradiated by a 400W high-pressure mercury lamp for 1 hour, and the obtained precipitate was filtered, washed with distilled water and ethanol, and dried in an oven at 70° C. for 12 hours. NaNbO was added to the methanolic solution 3 The powder and chloroplatinic acid were irradiated by a 400W high-pressure mercury lamp for 1 hour, and the obtai...

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Abstract

The invention relates to the field of preparation and application of nanowire photocatalytic materials, in particular to a method for preparing a catalyst for photocatalytic CO2 reduction. The method comprises the following steps of: synthesizing a precursor, namely Na2Nb2O6.H2O nanowires by a surfactant-assisted hydrothermal method, and calcining in an electric furnace in air atmosphere to prepare sodium niobate nanowires. The generation rate of CH4 converted from CO2 by the sodium niobate nanowires is improved by 20 times compared with that of the CH4 converted from the CO2 by sodium niobate prepared by a high-temperature solid-phase reaction method.

Description

technical field [0001] The invention relates to the application field of nanometer photocatalytic materials, especially a kind of photocatalytic CO 2 Process for the preparation of reduced catalysts. Background technique [0002] Before the Industrial Revolution, atmospheric CO 2 The concentration is around 300ppm for a long time. Later, with the massive consumption of petroleum and fossil energy, CO 2 Concentrations in the Earth's atmosphere are increasing. In January 2012 it reached 393.09ppm. It is foreseeable that for a long time in the future, human beings will mainly rely on fossil energy, so CO 2 The problem of the greenhouse effect caused by increasing concentrations will persist for a long time. This will cause a series of serious problems such as rising temperature, melting glaciers, increasing frequency of global extreme climate events, rising sea level, deforestation, and shrinking land area, which will cause serious harm to the living environment of human ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/648B01J35/06C07C9/04C07C1/02
Inventor 史海峰杨莉
Owner JIANGNAN UNIV
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