Chitosan/KIT-6 type silicon-based composite material, and preparation method and application thereof

A silicon-based composite material, KIT-6 technology, applied in chemical instruments and methods, other chemical processes, adsorption water/sewage treatment, etc., can solve the problems of limited progress, low adsorption performance of heavy metal ions, low ion exchange capacity, etc., Achieve the effects of short processing cycle, shortened synthesis time and high practical value

Active Publication Date: 2018-12-18
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the fact that the pure silica material itself does not have active groups, KIT-6 has low selective adsorption performance for heavy metal ions and low ion exchange capacity, these defects largely limit its progress in actual production and application.

Method used

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  • Chitosan/KIT-6 type silicon-based composite material, and preparation method and application thereof
  • Chitosan/KIT-6 type silicon-based composite material, and preparation method and application thereof
  • Chitosan/KIT-6 type silicon-based composite material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1 Chitosan / KIT-6 type silicon-based composite material PEI-CS-KIT-6

[0033] The synthetic route of chitosan / KIT-6 silicon-based composite material PEI-CS-KIT-6 is as follows:

[0034]

[0035] (1) Preparation method

[0036] 1) Put 4g of P123 into an Erlenmeyer flask, add 120g of water, add 20mL of concentrated hydrochloric acid, stir in a water bath at 35°C overnight, then add 4g of n-butanol drop by drop, react for 1 hour, then add 8.6g of TEOS, and react 2h, the resulting reaction solution is KIT-6 solution.

[0037] 2) Dissolve 2g CS in 50mL acetic acid, stir and dissolve to obtain a chitosan (CS) solution. Pour the KIT-6 solution obtained in step 1) into the chitosan (CS) solution, then add 15 mL of glutaraldehyde dropwise, continue the reaction at 35 ° C for 22 h, then transfer to an autoclave, and conduct a hydrothermal reaction at 100 ° C for 20 h, Suction filtration, wash with alcohol first, then wash with water until neutral, and dry overnigh...

Embodiment 2

[0044] Embodiment 2 chitosan / KIT-6 type silicon-based composite material PEI-CS-KIT-6 is to the adsorption of Cr (VI)

[0045] Method: take the solution containing hexavalent chromium, adjust the pH to 1-8, add the chitosan / KIT-6 type silicon-based composite material PEI-CS-KIT prepared in Example 1 according to the ratio of solid-liquid ratio 1mg:1ml -6, adsorption at 303K for 24 hours by shaking.

[0046] (1) Adsorption effect on Cr(VI) under different acidity

[0047] Method: Take the hexavalent chromium solution with a pH of 1, 2, 4, 6, and 8 and a concentration of 20ppm respectively, add the PEI-CS-KIT-6 prepared in Example 1 at a solid-to-liquid ratio of 1mg:1ml, and add it at 303K Shock adsorption for 24h. The adsorption rate was measured, and the results were as follows Figure 5 As shown, at pH 1-4, -NH 2 is protonated, while Cr(VI) is mainly HCrO 4 - with Cr 2 o 7 2- The existence of the form makes Cr(VI) easy to be adsorbed, and the adsorption rate can reac...

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PUM

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Abstract

The invention relates to a chitosan/KIT-6 type silicon-based composite material, and a preparation method and an application thereof. The preparation method comprises the following steps: dissolving an appropriate amount of P123 in water, adding concentrated hydrochloric acid, performing stirring overnight in a water bath, adding n-butanol, performing stirring, adding tetraethyl orthosilicate, carrying out a reaction, pouring the obtained solution into a chitosan solution, dropwise adding glutaraldehyde, continuously carrying out a reaction for a period of time, transferring the obtained solution into an autoclave, carrying out a hydrothermal reaction for a certain period of time, cooling the obtained solution, carrying out suction filtration, washing the obtained reaction product to reachneutrality, drying the washed reaction product overnight, and carrying out Soxhlet extraction by using acetone to obtain CS-KIT-6; and dissolving the CS-KIT-6 in dimethyl sulfoxide, adding an appropriate amount of epichlorohydrin, carrying out a microwave reaction, washing the obtained reaction product to reach neutrality, drying the washed reaction product overnight, adding a certain amount of apolyethyleneimine solution and a certain amount of N,N-dimethylformamide, carrying out a microwave reaction, washing the obtained reaction product to reach neutrality, and drying the washed reactionproduct overnight to obtain the product PEI-CS-KIT-6. The composite material prepared in the invention can be applied to the adsorption of chromium in water as an adsorbent, and has the characteristics of energy saving, environmental protection and high efficiency.

Description

technical field [0001] The invention belongs to the field of preparation of composite materials and adsorption of heavy metals, and in particular relates to a method for effectively adsorbing hexavalent chromium from a solution containing hexavalent chromium by a chitosan / KIT-6 type silicon-based composite material. Background technique [0002] Chromium and its compounds are widely used in industry. A series of industries such as chemical industry, metallurgy, mineral engineering, chromium production, electroplating, pharmaceuticals, light industry and textile will produce a large amount of chromium-containing wastewater. Hexavalent chromium is an important pollutant in water bodies and has persistent hazards to the environment. Hexavalent chromium is easily absorbed by the human body, and it can invade the human body through the digestive tract, respiratory tract, skin and mucous membranes. When it invades through the digestive tract, it can cause vomiting and abdominal pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/22
CPCB01J20/103B01J20/24C02F1/28C02F2101/22
Inventor 孙思瑶单炜军张鹏王丹丹熊英娄振宁
Owner LIAONING UNIVERSITY
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