Preparation method for photocatalytic material with strong adsorption and high visible light degradation of performance

A catalytic material and nano-light technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of few application reports of LDHs derivatives

Inactive Publication Date: 2014-04-02
HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, most of the LDHs derivatives used in the field of photocatalysis are bimetallic composite oxides, and there are few reports on the application of ternary and above LDHs derivatives in photocatalysis

Method used

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  • Preparation method for photocatalytic material with strong adsorption and high visible light degradation of performance
  • Preparation method for photocatalytic material with strong adsorption and high visible light degradation of performance
  • Preparation method for photocatalytic material with strong adsorption and high visible light degradation of performance

Examples

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Embodiment 1

[0026] (1) Preparation of salt solution: add zinc nitrate, nickel nitrate and aluminum nitrate at a concentration ratio of 2:1:1 into deionized water, fully dissolve to form a solution, and its total metal ion concentration is 1.0 mol L -1 ;

[0027] (2) Preparation of alkaline solution: mix NaOH and Na 2 CO 3 respectively dissolved in deionized water to form [OH - ]=1.6 mol L -1 , [CO 3 2- ]=0.5 mol L -1 alkaline solution;

[0028](3) Preparation of mixed solution: heat the mixed salt solution prepared in step (1) to 80 °C in a magnetic water bath, and under rapid magnetic stirring, use a constant current pump to dissolve the alkali solution prepared in step (2) in 3 mL min -1 Add it into the mixed salt solution until the pH value of the mixed solution is equal to 9, and continue to stir at 80 °C for 1 h;

[0029] (4) Preparation of hydrotalcite-like: transfer the mixed solution prepared in step (3) to a hydrothermal reaction kettle lined with polytetrafluoroethyle...

Embodiment 2

[0033] (1) Preparation of salt solution: add zinc nitrate, nickel nitrate and aluminum nitrate at a concentration ratio of 3:1:1 into deionized water, fully dissolve to form a solution, and its total metal ion concentration is 0.8 mol L -1 ;

[0034] (2) Preparation of alkaline solution: a certain amount of NaOH and Na 2 CO 3 respectively dissolved in deionized water to form [OH - ]=1.3 mol L -1 , [CO 3 2- ]=0.6 mol L -1 alkaline solution;

[0035] (3) Preparation of mixed solution: heat the mixed salt solution prepared in step (1) to 80 °C in a magnetic water bath, and under rapid magnetic stirring, use a constant current pump to dissolve the alkali solution prepared in step (2) in 2 mL min -1 Add it into the mixed salt solution until the pH value of the mixed solution is 8, and continue to stir at 80 °C for 1 h;

[0036] (4) Preparation of hydrotalcite-like: transfer the mixed solution prepared in step (3) to a hydrothermal reaction kettle lined with polytetrafluor...

Embodiment 3

[0040] (1) Preparation of salt solution: Add zinc nitrate, nickel nitrate and aluminum nitrate at a concentration ratio of 1:1:1 into deionized water, fully dissolve to form a solution, and its total metal ion concentration is 1.2 mol L -1 ;

[0041] (2) Preparation of alkaline solution: a certain amount of NaOH and Na 2 CO 3 respectively dissolved in deionized water to form [OH - ]=1.9 mol L -1 , [CO 3 2- ]=0.8 mol L -1 alkaline solution;

[0042] (3) with step (3) in embodiment 1;

[0043] (4) Preparation of hydrotalcite-like: transfer the mixed solution prepared in step (3) to a hydrothermal reactor lined with polytetrafluoroethylene, and conduct hydrothermal treatment at 150 °C for 8 h. Cool the reaction kettle to room temperature naturally, pour it into a vacuum filtration device for suction filtration, filter and wash with deionized water for 3 times, put the obtained light green precipitate in a drying oven, dry at 70 °C for 3 h, and grind to obtain product; ...

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Abstract

The invention discloses a gahnitem, zinc oxide and nickel zinc nano-composite photocatalytic material which has a high specific surface area and a mesoporous structure and is prepared by roasting at high temperature by taking ternary hydrotalcite as a precursor. The material is used for the adsorption and the degradation of organic pollutants. The photocatalytic material is prepared by taking zinc nitrate, nickel nitrate, aluminum nitrate, sodium carbonate, sodium hydroxide and the like as raw materials; preparing the raw materials into salt solutions and alkali solutions respectively; mixing the solutions by using a constant-flow pump at the temperature of 80 DEGC with magnetic stirring, transferring the mixed solution into a hydrothermal reaction kettle; performing hydrothermal treatment at 130 to 180 DEG C; performing suction filtration, washing and drying to the precursor; roasting the precursor in Muffle furnace for 2 to 6 hours at the temperature of 400 to 600 DEG C to obtain the product, wherein the specific surface area is greater than 150 m<2>.g<-1>. The photocatalyst disclosed by the invention has regular shape, large specific surface area, and super-high capacity for adsorbing and degrading organics, and can be reused; the raw materials for preparing the composite photocatalyst are abundant, the cost is low, and the process is simple.

Description

technical field [0001] The invention belongs to the technical field of advanced materials and their preparation, and relates to a preparation method technology of a photocatalytic material with strong adsorption and high visible light degradation performance. The photocatalytic material has strong adsorption performance and high photocatalytic degradation activity under visible light irradiation. Background technique [0002] Hydrotalcite-like (abbreviated as LDHs) is a kind of layered materials with special structure, which can be transformed into spinel-type composite metal oxides under high-temperature calcination conditions. Due to the low lattice energy and lattice positioning effect of LDHs, the metal ions and interlayer anions in the laminates are evenly distributed in a certain way, and the chemical composition of each structural unit of LDHs remains unchanged. Therefore, a series of spinel-type composite metal oxide photocatalytic materials with adjustable composit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J35/10C02F1/30C02F101/38
Inventor 张丽阎建辉周民杰钟明易雄杰
Owner HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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