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A kind of synthetic method of orange peel cellulose based transition metal cation surface imprinted polymer

A cellulose-based, transition metal technology, applied in chemical instruments and methods, water pollutants, other chemical processes, etc., to achieve high specific adsorption, hydrophilic and degradable, great economic and social benefits.

Active Publication Date: 2018-04-10
QUZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Its special synthetic route has not been reported yet

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  • A kind of synthetic method of orange peel cellulose based transition metal cation surface imprinted polymer

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Experimental program
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Effect test

Embodiment 1

[0020] First, ethanol leaching, alcoholization and alkalization. Take two flasks respectively, take 10 grams of orange peel powder and 200ml of ethanol solution (80% concentration), and extract them in a water bath at 80°C for 4 hours. The mother liquor is recycled (80% ethanol). Add 100ml of NaOH solution (0.1mol / L) to the reaction product, stir for 1 hour, separate with a centrifuge, add 100ml of isopropanol solution (20% concentration), soak overnight. The soaked solution is separated with a centrifuge.

[0021] Second, polyacrylamide grafting. Pour the separated product into a dry three-necked flask equipped with a mechanical stirrer and a condenser, add 90mL of xylene, adjust the pH of the system to 4~5 with acetic acid; add 15g of 3-chloropropyltrimethoxysilane and mix Evenly, react at a constant temperature of 353K for 10h, and soak overnight. The soaked product is centrifuged. Add the isolated product to the reaction kettle, weigh 13.6g of polyacrylamide, add 76.9...

Embodiment 2

[0025] The product of the polyacrylamide grafting step in Example 1 was modified with thiosemicarbazide. Weigh 1.5g of the product of the polyacrylamide grafting step, add dilute HCl solution to adjust the pH value to 7.0, then add 1.67g of HCHO aqueous solution with a mass fraction of 36.69%, and make n (previous step product): n (HCHO ) = 1:1 solution, the hydroxymethylation reaction occurred at 25°C and maintained for 3h. Then, add thiosemicarbazide to the reactant, so that n (product of the previous step): n (HCHO): n (thiosemicarbazide) = 1: 1: 1.5. Raise the temperature to 353K, reflux and stir the reaction for 9h, and pass N during the reaction. 2 for protection.

[0026] Then, the imprinting reaction and cross-linking regeneration method in Example 1 were carried out to obtain the copper ion imprinted polymer.

Embodiment 3

[0028] First, the alcoholized and alkalized cellulose in Example 1 is directly modified with thiosemicarbazide or thiourea in Example 2, and then reacted according to the imprinting reaction and crosslinking regeneration method in Example 1 to obtain copper ion imprinted polymerization things.

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Abstract

The invention relates to a method for synthesizing orange peel cellulose-based transition metal cation surface imprinted polymer. Firstly, orange peel pretreatment is carried out, the orange peel is dried, crushed, and sieved to obtain 100-mesh orange peel powder, which is extracted with ethanol for flavonoids, alkalized and alcoholized to obtain hydroxylated orange peel cellulose with a larger specific surface area . Aldol condensation reaction is used to graft alkyl groups on the surface of orange peel cellulose, and the electrophilic substitution reaction between alkyl groups and amino groups is used to obtain adsorption sites with complexing effects on transition metal cations. Afterwards, the target ions are added to complex with the adsorption sites on the surface of orange peel cellulose. After the adsorption is balanced, a cross-linking agent is added to cross-link, and the adsorption sites and target ions are surrounded to form a semi-closed space. Finally, a certain proportion of mixed HCl and thiourea solution was added as a regeneration agent to remove the target ions to obtain a surface-imprinted polymer that can recognize the target cation.

Description

technical field [0001] The invention relates to a comprehensive utilization method of orange peel, especially a modification method for the residue after extraction of flavonoids—biomass cellulose, that is, the graft synthesis on its porous surface has specificity for transition metal cations. Blot sites for identifying adsorption properties. Background technique [0002] With the rapid development of my country's economy, heavy metal pollution caused by industrial production has become one of the most important environmental pollutants, such as chromium, cadmium, and lead pollution in the electroplating industry, chromium pollution in the leather industry, and lead pollution in the battery industry. These heavy metals, Its dangers have continued to emerge. Therefore, the discharge status of heavy metals and pollution control technology continue to attract people's attention. my country has realized that pollution control should not only stay at the end control technology, b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62C02F101/20
Inventor 曾惠明吕亮程慎玉
Owner QUZHOU UNIV
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