Preparation method of Cr (VI) ion imprinted material based on surface of MCM-41 molecular sieve

A technology of MCM-41 and ion imprinting, which is applied in the field of preparation of Cr ion imprinting materials, can solve the problems of slow mass transfer and difficult elution, and achieve good mechanical properties, good adsorption, and large specific surface area. Effect

Inactive Publication Date: 2020-10-02
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional ion imprinting preparation method recognizes that the recognition sites are distributed in the imprinted material, and some of the recognition sites are embedded too deeply so that the template ions cannot reach and there are failure sites, and the mass transfer speed is slow and it is difficult to elute.

Method used

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  • Preparation method of Cr (VI) ion imprinted material based on surface of MCM-41 molecular sieve
  • Preparation method of Cr (VI) ion imprinted material based on surface of MCM-41 molecular sieve
  • Preparation method of Cr (VI) ion imprinted material based on surface of MCM-41 molecular sieve

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Effect test

Embodiment 1

[0016] A kind of Cr (Ⅵ) ion imprinted material based on MCM-41 molecular sieve surface, comprises the steps:

[0017] (1) Preparation of MCM-41: Weigh 1.2 g of cetyltrimethylammonium bromide into a three-necked flask, and simultaneously measure 90 mL of ammonia water and 130 mL of distilled water into the three-necked flask. Stir at 60°C until cetyltrimethylammonium bromide is completely dissolved. Under vigorous stirring, 5 mL of ethyl orthosilicate was slowly added dropwise, and stirred at a constant speed, and reacted for 6 hours. Stop the reaction and pour it out while it is hot. At room temperature, it crystallizes for 3d. The solid particles were washed to neutral and dried. Burn in a muffle furnace at 550°C for 6 hours to remove hexadecyltrimethylammonium bromide to obtain MCM-41;

[0018] (2) Weigh 0.2-0.25mmol of potassium dichromate solid in a three-necked flask, then add 10mL of ultrapure water to fully dissolve it, then weigh 80-100mL of methanol and add it to t...

Embodiment 2

[0023] (1) Preparation of MCM-41: Weigh 1.2 g of cetyltrimethylammonium bromide into a three-necked flask, and simultaneously measure 90 mL of ammonia water and 130 mL of distilled water into the three-necked flask. Stir at 60°C until cetyltrimethylammonium bromide is completely dissolved. Under vigorous stirring, 5 mL of ethyl orthosilicate was slowly added dropwise, and stirred at a constant speed, and reacted for 6 hours. Stop the reaction and pour it out while it is hot. At room temperature, it crystallizes for 3d. The solid particles were washed to neutral and dried. Burn in a muffle furnace at 550°C for 6 hours to remove hexadecyltrimethylammonium bromide to obtain MCM-41;

[0024] (2) Weigh 0.2-0.25mmol of potassium dichromate solid in a three-necked flask, then add 10mL of ultrapure water to fully dissolve it, then weigh 80-100mL of methanol and add it to the three-necked flask, mix well, and drop 2mL of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, react for 1-2h...

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Abstract

The invention discloses a preparation method of a Cr (VI) ion imprinted material based on the surface of an MCM-41 molecular sieve. According to the method, mesoporous MCM-41 is used as a carrier, Cr(VI) ions are used as a template, N-(beta-aminoethyl)-gamma-aminopropyltrimethoxysilane is used as a functional monomer, epoxy chloropropane is used as a cross-linking agent, hydrochloric acid is usedas an eluent, and the Cr (VI) ion imprinted material based on the surface of an MCM-41 molecular sieve is prepared through a surface ionic imprinting technology. The Cr (VI) ion imprinted material based on the surface of an MCM-41 molecular sieve has the advantages of simple steps, convenience in operation, high production efficiency and the like, and has good adsorbability and selectivity for Cr(VI) ions in water.

Description

technical field [0001] The invention belongs to the technical field of preparation of environmental functional materials, and in particular relates to a preparation method of a Cr(VI) ion imprinted material on the surface of MCM-41 molecular sieve. Background technique [0002] Chromium is a metal-like element ubiquitous in nature. Heavy metal chromium wastewater produced in electroplating, metal finishing process, leather tanning, cement anticorrosion, paint, pigment, textile and steel manufacturing industries is widely discharged into the environment. Chromium has different oxidation states ranging from -2 to +6, but the most stable forms are hexavalent and trivalent chromium. Compared with trivalent chromium, hexavalent chromium has higher solubility and mobility in water, which is about 500 times that of trivalent chromium, and is about 100 times more toxic than trivalent chromium, which may cause liver damage, vomiting and lung congestion. Considered genotoxic, mutagen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F101/22
CPCB01J20/268B01J20/3057C02F1/285C02F2101/22
Inventor 弓亮彭芃杨勤桃黄丽丽解庆林陈南春
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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