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Preparation method and application of hemicellulose/chitosan/nano TiO2 hybrid material

A technology of hemicellulose and hybrid materials, applied in the fields of material science and environmental science, can solve problems such as unfavorable recycling, lower adsorption performance, and limited application range, etc., to reduce the gradual depletion of raw materials, significant adsorption effect, and broad application prospects Effect

Active Publication Date: 2013-09-04
华山科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the condition of chitosan in an acidic environment, the -NH in the molecule 2 is protonated to form -NH 3 + However, dissolving in water causes the loss of the adsorbent, which is not conducive to regeneration, and -NH 3 + Repulsion with heavy metal cations limits its range of applications
Existing technology generally cross-links chitosan through chemical cross-linking agents such as glutaraldehyde, formaldehyde, epichlorohydrin to make chitosan reach the purpose of acid insolubility, but these chemical cross-linking agents themselves can be harmful to the natural environment. It is harmful and will occupy the adsorption sites of chitosan, reducing its adsorption performance, so it is especially important to seek alternatives to these chemical crosslinking agents

Method used

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  • Preparation method and application of hemicellulose/chitosan/nano TiO2 hybrid material
  • Preparation method and application of hemicellulose/chitosan/nano TiO2 hybrid material
  • Preparation method and application of hemicellulose/chitosan/nano TiO2 hybrid material

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Experimental program
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Effect test

Embodiment 1

[0022] 0.01g modified nano-TiO 2 Disperse in 50mL of 2% (v / v) dilute acetic acid solution, stir magnetically for 1h, add 1.5g chitosan, stir magnetically for 7h, ultrasonically disperse the solution for 15min every half hour, and dissolve completely after stirring for 12h to obtain chitosan / Nano-TiO 2 Emulsion; then in chitosan / nano-TiO 2 Add 6g of hemicellulose xylan to the emulsion, stir magnetically for 1-2 hours, and dissolve completely to obtain hemicellulose / chitosan / nano-TiO 2 Emulsion; the prepared hemicellulose / chitosan / nano-TiO 2 The emulsion was refluxed in an oil bath at 100°C for 30-60 minutes to obtain a light brown gel. The gel was further thermally cross-linked at 40°C for 6-9 hours, and then freeze-dried for 24 hours to obtain hemicellulose / chitosan / nano-TiO 2 hybrid materials.

Embodiment 2

[0024] 0.02g modified nano-TiO 2 Disperse in 50mL of 2% (v / v) dilute acetic acid solution, stir magnetically for 1h, add 1.5g chitosan, stir magnetically for 7h, ultrasonically disperse the solution for 15min every half hour, and dissolve completely after stirring for 12h to obtain chitosan / Nano-TiO 2 Emulsion; then in chitosan / nano-TiO 2 Add 6g of hemicellulose xylan to the emulsion, stir magnetically for 1-2 hours, and dissolve completely to obtain hemicellulose / chitosan / nano-TiO 2 Emulsion; the prepared hemicellulose / chitosan / nano-TiO 2 The emulsion was refluxed in an oil bath at 100°C for 30-60 minutes to obtain a light brown gel. The gel was further thermally cross-linked at 40°C for 6-9 hours, and then freeze-dried for 24 hours to obtain hemicellulose / chitosan / nano-TiO 2 hybrid materials.

Embodiment 3

[0026] 0.03g modified nano-TiO 2 Disperse in 50mL of 2% (v / v) dilute acetic acid solution, stir magnetically for 1h, add 1.5g chitosan, stir magnetically for 7h, ultrasonically disperse the solution for 15min every half hour, and dissolve completely after stirring for 12h to obtain chitosan / Nano-TiO 2 Emulsion; then in chitosan / nano-TiO 2 Add 6g of hemicellulose xylan to the emulsion, stir magnetically for 1-2 hours, and dissolve completely to obtain hemicellulose / chitosan / nano-TiO 2 Emulsion; the prepared hemicellulose / chitosan / nano-TiO 2 The emulsion was refluxed in an oil bath at 100°C for 30-60 minutes to obtain a light brown gel. The gel was further thermally cross-linked at 40°C for 6-9 hours, and then freeze-dried for 24 hours to obtain hemicellulose / chitosan / nano-TiO 2 hybrid materials.

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Abstract

The invention discloses a preparation method of a hemicellulose / chitosan nano TiO2 hybrid material and application of the material in heavy metal adsorption. The method comprises the steps as follows: nano TiO2 modified by sodium dodecyl sulfate and chitosan are dispersed in a dilute acetic acid solution, and chitosan / nano TiO2 emulsion is obtained after sufficient dissolution; then moderate hemicellulose is added in the emulsion to obtain hemicellulose / chitosan nano TiO2 emulsion, and a reflux reaction is performed at the temperature of 100 DEG C for 30-60 min to obtain beige gel; the gel is further subjected to a thermo-crosslinking reaction for 6-9 hours under the condition of ordinary pressure and the temperature of 40 DEG C; and after freeze drying, the hemicellulose / chitosan nano TiO2 hybrid material is obtained. The material prepared by the method has a good absorbing effect on the heavy metals such as Cu, Cr, Hg, Ni and Cd, an absorbing action on trace amount of ClO4 in water, and wide application prospect in the field of sewage treatment, in particular to groundwater water quality purification.

Description

technical field [0001] The present invention relates to a kind of hemicellulose / chitosan / nanometer TiO 2 The preparation method of the hybrid material and its use for heavy metal adsorption belong to the fields of material science and environmental science. Background technique [0002] Human activities have caused a large amount of industrial, agricultural and domestic waste to be discharged into the water, resulting in an increase in the content of heavy metals in the water, which seriously threatens human health and natural ecosystems. Heavy metal pollution mainly comes from industries such as clothing, petrochemicals, exhaust emissions, sewage irrigation and metallurgy. At present, the main technologies for the removal of heavy metal ions in water include chemical precipitation, redox, ion exchange, reverse osmosis, and biological adsorption. Adsorption technology has the advantages of good chemical stability and no secondary pollution. It is the most effective method ...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62
Inventor 杜予民吴述平施晓文邓红兵张俐娜姚华漆雕良仁
Owner 华山科技股份有限公司
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