Method for preparation of ZnO/diatomite nanoscale composite material by layer-by-layer self-assembly

A nano-composite material and layer-by-layer self-assembly technology, applied in the field of nano-composite material preparation, can solve the problems of high cost of wastewater treatment, difficult practical application, small powder particle size, etc., and achieve easy recovery, strong adsorption capacity, Simple effect of production equipment

Inactive Publication Date: 2012-09-12
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Due to the high photocatalytic activity and antibacterial properties of nanometer-sized ZnO, it is difficult to be practically applied due to the high cost of treating wastewater due to the small particle size and difficulty in recycling.

Method used

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  • Method for preparation of ZnO/diatomite nanoscale composite material by layer-by-layer self-assembly
  • Method for preparation of ZnO/diatomite nanoscale composite material by layer-by-layer self-assembly
  • Method for preparation of ZnO/diatomite nanoscale composite material by layer-by-layer self-assembly

Examples

Experimental program
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Embodiment 1

[0040]At room temperature, measure 150ml of absolute ethanol in a three-necked flask, add 2.82g of Zn(CH 3 COO) 2 2H 2 O, heated in a water bath to 80°C, and mechanically stirred until a transparent solution was obtained; at room temperature, weighed 1.6g of sodium hydroxide, dissolved in 100ml of absolute ethanol, and stirred magnetically to completely dissolve it. The obtained sodium hydroxide solution was slowly added dropwise into the zinc acetate solution under a water bath at 70°C. Stirring was continued for 30 min after the dropwise addition was completed. The resulting product was cooled to room temperature, and ultrasonically dispersed for 30 minutes to obtain a zinc oxide sol.

[0041] Weigh 3g of diatomaceous earth and immerse in 20ml of the obtained zinc oxide sol, stir for 2min, filter, wash the product 3 times with deionized water; then immerse the product in 20ml of polyacrylic acid aqueous solution with a concentration of 0.01mmol / L, stir for 2min, filter, r...

Embodiment 2

[0045] At room temperature, measure 150ml of absolute ethanol in a three-necked flask, add 2.82g of Zn(CH 3 COO) 2 2H 2 O, heated in a water bath to 80°C, and mechanically stirred until a transparent solution was obtained; at room temperature, weighed 1.6g of sodium hydroxide, dissolved in 100ml of absolute ethanol, and stirred magnetically to completely dissolve it. The obtained sodium hydroxide solution was slowly added dropwise into the zinc acetate solution under a water bath at 70°C. Stirring was continued for 30 min after the dropwise addition was completed. The resulting product was cooled to room temperature, and ultrasonically dispersed for 30 minutes to obtain a zinc oxide sol.

[0046] Weigh 3g of diatomaceous earth and immerse in 20ml of the obtained zinc oxide sol, stir for 2min, filter, wash the product 3 times with deionized water; then immerse the product in 20ml of polyacrylic acid aqueous solution with a concentration of 0.01mmol / L, stir for 2min, filter, ...

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Abstract

The invention relates to a method for preparation of a ZnO / diatomite nanoscale composite material by layer-by-layer self-assembly. The method comprises the following steps of 1, slowly and dropwisely adding an alcoholic solution of one or more alkalis into an alcoholic solution of zinc acetate, after dropwise addition is finished, sequentially stirring, and carrying out ultrasonic dispersion to obtain ZnO sol, 2, immersing diatomite in the ZnO sol, stirring, filtering, washing by deionized water, immersing the treated diatomite in a negatively charged polyelectrolyte solution, stirring, filtering, washing by deionized water, repeating the above processes n times to obtain a self-assembled ZnO / diatomite material having n+1 layers, wherein n is great than or equal to 0 and less than or equal to 10, and 3, drying the self-assembled ZnO / diatomite material obtained by the step 2 in an oven, and carrying out calcination at a temperature of 300 to 500 DEG C. The method provided by the invention has simple processes, adopts simple production equipment and realizes industrial production easily. The ZnO / diatomite nanoscale composite material loaded with ZnO nanoscale particles and obtained by the method has a strong adsorption capability and a good photocatalytic activity, can be recovered easily and has wide application prospects.

Description

technical field [0001] The invention belongs to the field of preparation of nano-composite materials, in particular to a method for preparing zinc oxide / diatomite nano-composite materials by a layer-by-layer self-assembly method. Background technique [0002] Water pollution is one of the major issues facing mankind at present. There are many methods for sewage treatment. Adsorption method has become a commonly used sewage treatment method because of its large adsorption capacity, high adsorption efficiency, and wide source of raw materials. In principle, any solid material with a microporous structure can be used as an adsorbent. Diatomite, a natural material with an ordered microporous structure, has a large specific surface area and has adsorption properties for heavy metal ions and many organic substances. Rich and low cost, it provides broad prospects for sewage treatment. [0003] Diatomaceous earth is a biogenic siliceous rock whose main component is SiO 2 , under a...

Claims

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Application Information

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IPC IPC(8): B01J23/06B01J35/10B01J37/00B01J20/14B01J20/30A01N59/16A01P1/00C02F1/30C02F1/50
Inventor 张青红李焕连江平涂仕雄王宏志李耀刚
Owner DONGHUA UNIV
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