Preparation method and application of cetyl trimethyl ammonium bromide modified composite chitosan microspheres

A technology of cetyltrimethylammonium bromide and chitosan microspheres, which is applied in the fields of chemical instruments and methods, alkali metal compounds, inorganic chemistry, etc., can solve the problems of complex preparation methods and achieve rich sources and easy operation The effect of simplicity and accelerated adsorption kinetics

Inactive Publication Date: 2021-01-22
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the adsorbent has broad-spectrum adsorption properties for common heavy metal ions, but its preparation method is complicated

Method used

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  • Preparation method and application of cetyl trimethyl ammonium bromide modified composite chitosan microspheres
  • Preparation method and application of cetyl trimethyl ammonium bromide modified composite chitosan microspheres
  • Preparation method and application of cetyl trimethyl ammonium bromide modified composite chitosan microspheres

Examples

Experimental program
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Effect test

Embodiment 1

[0030] (1) Disperse 0.8g of chitosan and 0.82g of ferric chloride in 50mL of deionized water at room temperature, and stir at a speed of 500r / s for 1h to form a sol; transfer the sol to a lined polytetrafluoroethylene In a 100mL hydrothermal kettle, heat at 180°C for 48h; filter the hydrothermal product, wash with 45mL of deionized water and 35mL of ethanol in turn, and dry the filter cake to obtain Fe 2 o 3 @CS microsphere;

[0031] (2) Fe obtained in step (1) 2 o 3 @CS microspheres were placed in 100 mL of an aqueous solution containing 0.6 g of CTAB and immersed at room temperature for 3 days; the separated solid matter was washed with deionized water and dried to obtain Fe 2 o 3 @CS@CTAB microspheres, named CFC-1.

[0032] (3) Absorb the sample with 50 mL of Cr(VI) solution with an initial concentration of 10 mg / L. It is 5% hydrochloric acid solution with mass fraction to adjust the pH of Cr(VI) solution to 3, then add the CFC-1 sample of 0.05g, when the adsorption r...

Embodiment 2

[0034](1) Disperse 1.0g of chitosan and 1.0g of ferric chloride in 50mL of deionized water at room temperature, and stir at a speed of 500r / s for 1h to form a sol; transfer the sol to a lined polytetrafluoroethylene In a 100mL hydrothermal kettle, heat water at 180°C for 48h; filter the hydrothermal product, wash it with 50mL of deionized water, and then wash with 45mL of ethanol, and dry the filter cake to obtain Fe 2 o 3 @CS microsphere;

[0035] (2) Fe obtained in step (1) 2 o 3 @CS microspheres were placed in 100 mL of an aqueous solution containing 1.5 g of CTAB, and immersed at room temperature for 3 days; the separated solid matter was washed with deionized water and dried to obtain Fe 2 o 3 @CS@CTAB microspheres, named CFC-2.

[0036] (3) Use the sample to absorb 50 mL of Cr(VI) solution with an initial concentration of 10 mg / L. The pH of the Cr(VI) solution was adjusted to 3 with a 5% hydrochloric acid solution, and then 0.05 g of a CFC-2 sample was added. When...

Embodiment 3

[0038] (1) Disperse 1.5g of chitosan and 1.0g of ferric chloride in 50mL of deionized water at room temperature, and stir at a speed of 500r / s for 1h to form a sol; transfer the sol to a lined polytetrafluoroethylene In a 100mL hydrothermal kettle, heat at 180°C for 48h; after filtering the hydrothermal product, wash it with 60mL of deionized water, then wash with 45mL of ethanol, and dry the filter cake to obtain Fe 2 o 3 @CS microsphere;

[0039] (2) Fe obtained in step (1) 2 o 3 @CS microspheres were placed in 100mL of an aqueous solution containing 1.0g of CTAB, and immersed at room temperature for 3d; the separated solid matter was washed with deionized water and dried to obtain Fe 2 o 3 @CS@CTAB microspheres, named CFC-3.

[0040] (3) Use the sample to absorb 50 mL of Cr(VI) solution with an initial concentration of 10 mg / L. The pH of the Cr(VI) solution was adjusted to 3 with a 5% hydrochloric acid solution, and then 0.05 g of a CFC-3 sample was added. When the a...

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Abstract

The invention discloses a preparation method and application of cetyl trimethyl ammonium bromide modified composite chitosan microspheres. The method comprises the following steps: by taking chitosanas a carbon source and ferric chloride as an iron source, carrying out hydrothermal carbonization to obtain composite chitosan microspheres; and then soaking the composite chitosan microsphere in a surfactant hexadecyl trimethyl ammonium bromide solution to obtain the hexadecyl trimethyl ammonium bromide modified composite chitosan microsphere. According to the invention, the adsorption performance of the prepared composite microsphere adsorbent on a Cr(VI) solution is remarkably improved, the composite microsphere adsorbent has an extremely high adsorption rate on Cr(VI), and under the optimal condition of preparing the adsorbent, the adsorption capacity of the adsorbent on Cr(VI) reaches 47-49 mg / g within 1 min, the adsorption kinetics is remarkably accelerated, and the removal rate of Cr(VI) reaches 95.58%, so that the composite microsphere adsorbent can be used for adsorbing highly toxic pollutants Cr(VI).

Description

technical field [0001] The invention belongs to the technical field of preparation of green adsorbent and water pollution control, and in particular relates to a preparation method and application of cetyltrimethylammonium bromide modified composite chitosan microspheres. Background technique [0002] With the rapid development of industry, the problem of industrial wastewater treatment has become increasingly prominent, and heavy metal pollution in wastewater has become a worldwide environmental problem. The heavy metal Cr has two stable oxidation states of trivalent state (Cr(III)) and hexavalent state (Cr(VI)), among which the toxicity of Cr(VI) is hundreds of times that of Cr(III), especially for the natural environment. Human health has great harm. Due to its high teratogenicity and carcinogenicity, Cr(VI) has been listed as one of the eight most harmful chemical substances to the human body, and one of the three internationally recognized carcinogenic metals. my count...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28B01J20/28C02F101/22
CPCB01J20/08B01J20/22B01J20/24B01J20/28019C02F1/28C02F2101/22
Inventor 蔡卫权强金霞易荣卫梁淑铃梁瑶瑶李嘉怡
Owner GUANGZHOU UNIVERSITY
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