Quaternized chitosan modified bentonite adsorption material, preparation thereof and application of quaternized chitosan modified bentonite adsorption material in adsorption of lead ions in waste water

A technology of quaternary ammonium chitosan and adsorption materials, applied in the direction of adsorption of water/sewage treatment, other chemical processes, chemical instruments and methods, etc., can solve the problems of poor adsorption performance of bentonite

Inactive Publication Date: 2017-05-31
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the untreated bentonite has poor adsorption performance, so the bentonite generally used for wastewater treatment often needs to be modified once or twice to increase its specific surface area and improve its adsorption capacity.
However, there is no report on modifying bentonite with 2,3-epoxypropyltrimethylammonium chloride as a modifier to improve its adsorption performance.

Method used

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  • Quaternized chitosan modified bentonite adsorption material, preparation thereof and application of quaternized chitosan modified bentonite adsorption material in adsorption of lead ions in waste water
  • Quaternized chitosan modified bentonite adsorption material, preparation thereof and application of quaternized chitosan modified bentonite adsorption material in adsorption of lead ions in waste water
  • Quaternized chitosan modified bentonite adsorption material, preparation thereof and application of quaternized chitosan modified bentonite adsorption material in adsorption of lead ions in waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) Preparation of Na-BT: Take 2g of bentonite (BT) dry powder, add 100ml of distilled water, heat to boiling, and stir to form a paste. Then add 2g Na 2 CO 3 , put it on a magnetic stirrer and stir for 3 hours, centrifuge, pour off the supernatant, wash with distilled water and ethanol three times respectively, put it in a vacuum drying oven, after 48 hours, take out the sample and grind it to get Na-BT, and set aside;

[0056] (2) Preparation of CTS-Na-BT: Weigh 1g of chitosan (CTS), dissolve in 1% acetic acid solution, sonicate for 20min, heat and stir for 30min, then add 3g of sodium bentonite, stir for 5h, centrifuge , pour off the supernatant, wash 3 times with distilled water and absolute ethanol, put it in a vacuum drying oven, and after 48 hours, take out the sample and grind it to obtain CTS-Na-BT, which is set aside;

[0057] (3) Preparation of GTMAC-CTS-Na-BT: Weigh 2g of CTS-Na-BT into a 250ml round bottom flask, add 60ml of distilled water, heat to boil,...

Embodiment 2

[0060] (1) Preparation of Na-BT: Weigh 1g of bentonite (BT) dry powder, add 100ml of distilled water, heat to boiling, and stir to form a paste. Then add 2g Na 2 CO 3 , put it on a magnetic stirrer and stir for 2 hours, centrifuge, pour off the supernatant, wash with distilled water and ethanol three times respectively, put it in a vacuum drying oven, after 24 hours, take out the sample and grind it to get Na-BT, and set aside;

[0061] (2) Preparation of CTS-Na-BT: Weigh 1g of chitosan (CTS), dissolve in 1% acetic acid solution, sonicate for 60min, heat and stir for 60min; then add 2g of sodium bentonite, stir for 5h, centrifuge , pour off the supernatant, wash 3 times with distilled water and absolute ethanol, put it in a vacuum drying oven, and after 24 hours, take out the sample and grind it to obtain the preparation of CTS-Na-BT, which is set aside;

[0062] (3) Preparation of GTMAC-CTS-Na-BT: Weigh 2g of CTS-Na-BT into a 250ml round bottom flask, add 80ml of distilled...

Embodiment 3

[0065] (1) Preparation of Na-BT: Weigh 3g of bentonite (BT) dry powder, add 100ml of distilled water, heat to boiling, and stir to form a paste. Then add 2g Na 2 CO 3 , placed on a magnetic stirrer and stirred for 5 hours, centrifuged, poured off the supernatant, washed 3 times with distilled water and ethanol respectively, put it in a vacuum drying oven, and after 48 hours, took out the sample and ground it to obtain Na-BT;

[0066] (2) Preparation of CTS-Na-BT: Weigh 2g of chitosan (CTS), dissolve in 1% acetic acid solution, sonicate for 40min, stir for 60min, then add 2g of sodium bentonite, stir for 5h, centrifuge, Pour off the supernatant, wash 3 times with distilled water and absolute ethanol, put it in a vacuum drying oven, and after 48 hours, take out the sample and grind it for later use;

[0067] (3) Preparation of GTMAC-CTS-Na-BT: Weigh 1g of CTS-Na-BT into a 250ml round bottom flask, add 100ml of distilled water, heat, boil, then add 3g (2,3-epoxy Propyl) trimet...

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Abstract

The invention provides a quaternized chitosan modified bentonite adsorption material. Chitosan for sodium based bentonite is modified at first, chitosan macromolecules are compounded with the bentonite, on the one hand, characteristics of high expansion, high suspension and the like of the bentonite in the waste water can be reduced, on the other hand, the problem that the chitosan is small in density, floats easily and is difficultly in contact with pollutants in a solution is solved; the chitosan sodium based bentonite is subjected to intercalation modification by using (2,3-glycidyl) trimethylammonium chloride as a modifying agent to obtain the quaternized chitosan modified bentonite adsorption material with a layered hole structure, the bentonite adsorption material has large specific surface area and has good adsorption property on the lead ions in the waste water, the maximum adsorption amount can reach 91.81 mg/g, and therefore, the quaternized chitosan modified bentonite adsorption material conforms to a Langmuir isothermal adsorption model and a quasi-second-order kinetic model, belongs to monomolecular-layer adsorption and is chemical adsorption.

Description

technical field [0001] The invention relates to a bentonite-based adsorption material, in particular to a bentonite adsorption material modified by quaternary ammonium chitosan and a preparation method thereof, which is mainly used for adsorbing lead ions in waste water and belongs to the technical field of composite materials and waste water treatment. [0002] technical background [0003] Heavy metal pollution is an environmental problem that is widely concerned at home and abroad. The source of heavy metal pollution is mainly the discharge of wastewater from industrial metal smelting and processing, machinery manufacturing, and chemical factories, which has long-term impacts and threats to human life and the balance of the ecosystem. At present, the treatment methods for heavy metal ion wastewater mainly include electrolysis, reverse osmosis, chemical precipitation, redox, solvent extraction and ion exchange. The adsorption method has been widely used in wastewater treat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28
Inventor 杨武巩莉郭昊周容平赵斌薛瑞
Owner NORTHWEST NORMAL UNIVERSITY
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