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Sandwich-structured nano-adsorbent of carbon-coated magnesium oxide and preparation method thereof

A carbon-coated magnesium oxide, nano-adsorption technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, other chemical processes, etc., can solve the problems of low adsorption rate, difficult collection of nano-MgO, hindering the process of industrial application, etc. , to achieve the effect of strong adsorption capacity, long service life and low cost

Inactive Publication Date: 2017-12-05
NEIJIANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nano-MgO has the disadvantages of difficult collection and low adsorption rate in wastewater treatment and environmental purification, which seriously hinders its industrial application.

Method used

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  • Sandwich-structured nano-adsorbent of carbon-coated magnesium oxide and preparation method thereof
  • Sandwich-structured nano-adsorbent of carbon-coated magnesium oxide and preparation method thereof
  • Sandwich-structured nano-adsorbent of carbon-coated magnesium oxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 5.1g of magnesium chloride hexahydrate, 1.23g of glucose monohydrate, and 1.0g of polyvinylpyrrolidone (Mw=58000) into 100mL of 50% ethanol solution, and stir at a constant temperature of 25°C and a stirring speed of 500r / min for 20min to form a magnesium salt solution. 5mL ammonia water (analytical grade, NH 3 content of 15%-28%) was added to the magnesium salt solution at a constant speed, and stirred at a constant temperature for 120 minutes at a temperature of 25° C. and a stirring speed of 450 r / min to form a magnesium salt slurry. The slurry was hydrothermally reacted at 170°C for 24 hours, washed by centrifugation, dried in vacuum and heated under N at a temperature of 500°C. 2 The carbon-coated MgO sandwich structure composite nanomaterial was obtained after flow-through calcination, denoted as MgO@C-1.

Embodiment 2

[0034] Weigh 5.1g of magnesium chloride hexahydrate, 4.92g of glucose monohydrate, and 2.0g of polyvinylpyrrolidone (Mw=58000) into 150mL of 50% ethanol solution, and stir at a constant temperature of 25°C and a stirring speed of 500r / min for 20min to form a magnesium salt solution. 5mL ammonia water (analytical grade, NH 3 content of 15%-28%) was added to the magnesium salt solution at a constant speed, and stirred at a constant temperature for 120 minutes at a temperature of 25° C. and a stirring speed of 450 r / min to form a magnesium salt slurry. The slurry was hydrothermally reacted at 170°C for 24 hours, washed by centrifugation, dried in vacuum and heated under N at a temperature of 500°C. 2 The carbon-coated magnesium oxide sandwich structure composite nanomaterial was obtained after flow-through calcination, which was denoted as MgO@C-2.

Embodiment 3

[0036]Weigh 10.2g of magnesium chloride hexahydrate, 2.46g of glucose monohydrate, and 2.0g of polyvinylpyrrolidone (Mw=58000) into 150mL of 50% ethanol solution, and stir at a constant temperature of 25°C and a stirring speed of 500r / min for 30min to form a magnesium salt solution. 10mL ammonia water (analytical grade, NH 3 content of 15%-28%) was added to the magnesium salt solution at a constant speed, and stirred at a constant temperature for 150 minutes at a temperature of 25° C. and a stirring speed of 450 r / min to form a magnesium salt slurry. The slurry was hydrothermally reacted at 150°C for 18h, washed by centrifugation, dried in vacuum and heated under N at a temperature of 500°C. 2 Sandwich structure composite nanomaterials of carbon-coated MgO were obtained after flow-through calcination, denoted as MgO@C-3.

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Abstract

The present invention provides a preparation method of a sandwich-structured nano-adsorbent of carbon-coated magnesium oxide. The method comprises the following steps: (1) adding magnesium chloride hexahydrate, dextrose monohydrate, and a carbonaceous material to ethanol water solution, and stirring the mixture well, wherein the carbonaceous material is at least one of hexadecyl trimethyl ammonium bromide, polyethylene glycol, ethylenediamine tetraacetic acid, polyvinylpyrrolidone, and dodecyl trimethyl ammonium bromide; (2) adding aqueous ammonia solution to the product obtained from the step (1), stirring the mixture to form magnesium salt slurry; and (3) subjecting the product obtained from the step (2) to a reaction at 100 to 250 DEG C for 10 to 36 hours, removing the supernatant after cooling, conducting centrifugal washing on the resulting precipitate, and calcining the precipitate at 250 to 600 DEG C for 2.0 to 6.0 hours under nitrogen conditions, so as to obtain the sandwich-structured nano-adsorbent of carbon-coated magnesium oxide. The adsorbent obtained by the present invention has the advantages of high adsorption capacity and high efficiency, and breaks the industrial application of inorganic nanomaterials in the technical field of water treatment.

Description

technical field [0001] The invention belongs to the technical field of water treatment adsorbents, in particular to a carbon-coated magnesium oxide sandwich-structured nano-adsorbent and a preparation method thereof. Background technique [0002] Pollutants in water include inorganic pollutants and organic pollutants. Inorganic pollutants mainly include heavy metal ions such as lead, chromium, mercury, and copper. These heavy metal elements are difficult to degrade, easy to accumulate, irreversible, highly toxic, slow in metabolism, and easy to be bioaccumulated in the environment. Long-term drinking of water polluted by heavy metals can cause acute and chronic poisoning or cause cancer of the body. Organic pollutants mainly include oxygen-consuming non-toxic organic substances (such as protein, fat and carbohydrates, etc.) and toxic organic substances (such as phenolic compounds, organic pesticides and polycyclic aromatic hydrocarbons, dyes and food additives, etc.), these...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/34C02F101/38
CPCB01J20/041B01J20/20C02F1/281C02F1/283C02F2101/34C02F2101/38C02F2101/40
Inventor 郑小刚黄明杨腾飞王珂
Owner NEIJIANG NORMAL UNIV
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