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Synthesis method for orange peel cellulose-based transition metal positive ion surface imprinted polymer

A cellulose-based, transition metal technology, applied in chemical instruments and methods, water pollutants, and other chemical processes, to achieve the effect of rich surface hydroxyl groups, regeneration and reuse, and hydrophilic degradability

Active Publication Date: 2015-12-16
QUZHOU UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Its special synthetic route has not been reported yet

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  • Synthesis method for orange peel cellulose-based transition metal positive ion 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, hydroxymethylation reaction occurred at 25°C, and maintained for 3h. Then, add thiosemicarbazide to the reactant, so that n (product of 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 thing.

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Abstract

The invention relates to a synthesis method for an orange peel cellulose-based transition metal positive ion surface imprinted polymer. The synthesis method comprises the following steps: firstly, pretreating orange peels, drying, smashing and screening the orange peels to obtain orange peel powder of 100 meshes, leaching flavonoids by ethyl alcohol, and performing alkalization and alcoholization to obtain hydroxylated orange peel cellulose with a larger surface area; grafting alkyl to the surface of the orange peel cellulose by aldol condensation, and obtaining adsorption sites with a complexing effect on transition metal positive ions by electrophilic substitution reaction between the alkyl and amino; then adding target ions, complexing the target ions with the adsorption sites on the surface of the orange peel cellulose, adding a crosslinking agent for crosslinking after adsorption is balanced so as to encircle the adsorption sites and the target ions to form a semi-closed space; finally adding HCl and a thiourea solution which are mixed according to a certain ratio to prepare a regeneration agent to remove the target ions, and obtaining the surface imprinted polymer with an identification effect on the target cations.

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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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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