Preparation method of nano zinc oxide modified vermiculite

A technology of nano-zinc oxide and vermiculite, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve problems such as separation troubles and separation difficulties, achieve low risk, increase specific surface area, Ease of promotion

Inactive Publication Date: 2018-07-06
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the fine particles of nano-zinc oxide, it is very difficult to separate later, so loading nano-zinc oxide on clay minerals such as vermiculite can overcome the disadvantage of troublesome separation in the later stage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of preparation method of nano-zinc oxide modified vermiculite, weigh 2g vermiculite in 100mL distilled water, constantly stir, add certain surfactant, prepare 1 mole of zinc sulfate heptahydrate solution, 0.5 mole of sodium hydroxide solution Mole was added to the vermiculite slurry solution at the same time, stirred in a constant temperature water bath at 60°C for 2 hours, left to stand for 24 hours, filtered, dried, and burned to obtain nano-zinc oxide modified vermiculite. The adsorption experiment conditions are: modified vermiculite 0.2g, heavy metal Ni 2+ The solution volume is 50mL, the concentration is 50mg / L, the adsorption time is 120min, and the solution pH=6. Determination of Ni by ICP-OES 2+ Concentration, calculated to get the heavy metal Ni 2+ The adsorption rate was 85.27%.

Embodiment 2

[0026] A kind of preparation method of nano-zinc oxide modified vermiculite, weigh 2g vermiculite in 100mL distilled water, constantly stir, add certain surfactant, prepare 1 mole of zinc sulfate heptahydrate solution, 1 mole of sodium hydroxide solution Mole was added to the vermiculite slurry solution at the same time, stirred in a constant temperature water bath at 60°C for 2 hours, left to stand for 24 hours, filtered, dried, and burned to obtain nano-zinc oxide modified vermiculite. The adsorption experiment conditions are: modified vermiculite 0.2g, heavy metal Ni 2+ The solution volume is 50mL, the concentration is 50mg / L, the adsorption time is 120min, and the solution pH=6. Determination of Ni by ICP-OES 2+ Concentration, calculated to get the heavy metal Ni 2+ The adsorption rate was 87.28%.

Embodiment 3

[0028] A kind of preparation method of nano-zinc oxide modified vermiculite, weigh 2g vermiculite in 100mL distilled water, constantly stir, add certain tensio-active agent, will prepare 1 mole of zinc sulfate heptahydrate solution, sodium hydroxide solution 2 Mole was added to the vermiculite slurry solution at the same time, stirred in a constant temperature water bath at 60°C for 2 hours, left to stand for 24 hours, filtered, dried, and burned to obtain nano-zinc oxide modified vermiculite. The adsorption experiment conditions are: modified vermiculite 0.2g, heavy metal Ni 2+ The solution volume is 50mL, the concentration is 50mg / L, the adsorption time is 120min, and the solution pH=6. Determination of Ni by ICP-OES 2+ Concentration, calculated to get the heavy metal Ni 2+ The adsorption rate is 88.93%.

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PUM

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Abstract

The invention discloses a preparation method of nano zinc oxide modified vermiculite. The preparation method comprises the following operation steps: a, pre-treating vermiculite; enabling the naturalvermiculite to pass through distilled water; repeatedly washing by adopting a pouring method until an upper-layer solution is clear and transparent; washing the vermiculite with absolute ethyl alcohol; putting the vermiculite into a drying oven and drying; taking out the vermiculite and cooling to room temperature; grinding and sieving for later use; b, preparing a ZnSO4.7H2O solution and an NaOHsolution; c, weighing the vermiculite sieved and treated in step a and preparing vermiculite slurry in the distilled water; adding the ZnSO4.7H2O solution and the NaOH solution, which are prepared bystep b, into the vermiculite slurry at the same time and stirring; continuously stirring in a constant-temperature water-bath pot and standing for 24h; filtering and washing with de-ionized water until no sulfate ions exist; then putting into a muffle furnace and calcining to obtain the nano zinc oxide modified vermiculite. According to the technical scheme disclosed by the invention, the preparation method of the nano zinc oxide modified vermiculite adopts a chemical precipitation method and zinc oxide generated by reaction can be effectively loaded on the surface of the vermiculite.

Description

technical field [0001] The invention relates to the technical field of pollution prevention and control, in particular to a preparation method of nano zinc oxide modified vermiculite and a preparation method thereof. Background technique [0002] Heavy metal pollution is one of the most harmful water pollution problems, and water heavy metal pollution has become a worldwide environmental problem. The type, content and form of heavy metals in wastewater vary greatly with the different types of production. It has the characteristics of serious pollution, great harm, and difficult treatment. Therefore, the treatment of heavy metal wastewater is very necessary. [0003] In recent years, the application of new and cheap clay minerals in water treatment has become a research hotspot and focus. Clay minerals have low processing cost, large specific surface area, high cation exchange capacity and cation adsorption capacity. A large number of studies have shown that vermiculite, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12C02F1/28B01J20/30C02F101/20
CPCB01J20/06B01J20/12C02F1/281C02F2101/20
Inventor 管登高吴彩文徐冠立孙遥刘扬胡德豪戴泽航张维林金辉孙传敏
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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