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A kind of black talc-polyvinyl formal gel composite adsorption material

A polyvinyl formal, composite adsorption material technology, applied in the direction of adsorption water/sewage treatment, alkali metal compounds, other chemical processes, etc., can solve the problems of poor chemical and mechanical properties, brittleness, poor recycling effect, etc. Achieve the effects of good adsorption, easy control of reaction conditions and simple preparation method

Active Publication Date: 2022-05-24
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the existing defects of polyvinyl acetal gel with poor chemical and mechanical properties, fragility, and poor recycling effect, the present invention provides a novel black talc-polyvinyl formal gel composite adsorption material and its Preparation method and application in dye adsorption, the purpose of the method of the present invention is to provide a kind of dry gel adsorbent with natural mineral material adsorbent, high adsorption, easy recovery, high stability

Method used

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  • A kind of black talc-polyvinyl formal gel composite adsorption material
  • A kind of black talc-polyvinyl formal gel composite adsorption material
  • A kind of black talc-polyvinyl formal gel composite adsorption material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Add 2.0g PVA to a 100ml three-neck flask, then add 18g of water, stir at 95 °C in an oil bath pot to dissolve completely, and mix into a 10wt% aqueous PVA solution. Then add 0.5g of black talc powder and stir for 1h to form a black talc / PVA homogeneous emulsion. Cool down to 72°C.

[0029] (2) Weigh 0.1 g of hexane and 1.0 g of sodium bicarbonate in a 10 ml centrifuge tube, add 3 ml of water and shake to evenly blister. The foaming solution was added to the black talc / PVA homogeneous emulsion cooled to 72 °C and stirred until the sodium bicarbonate was dissolved in the mixed solution, and the emulsion volume expanded from the original 18 ml foam to 36 ml. Continue stirring for 5 min and cool down to 40 °C.

[0030] (3) When the temperature drops to 40 °C, 2 ml of formaldehyde is added, and the crosslinking reaction is 20 min. Pour the hydrogel into a mold at 60 °C and cure for 12 h, remove, repeatedly soak in water, squeeze, remove the unreacted monomers, wash to neutra...

Embodiment 2

[0032] (1) Add 2.0g PVA to a 100ml three-neck flask, then add 18g of water, stir at 95 °C in an oil bath pot to dissolve completely, and mix into a 10wt% aqueous PVA solution. Then add 1.0g of black talc powder and stir for 1.5h to form a black talc / PVA homogeneous emulsion. Cool down to 72°C.

[0033] (2) Weigh 0.15g hexane and 1.2g sodium bicarbonate in a 10ml centrifuge tube, add 3ml of water and shake to evenly foam. The foaming solution was added to the black talc / PVA homogeneous emulsion cooled to 72 °C and stirred until the sodium bicarbonate was dissolved in the mixed solution, and the emulsion volume expanded from the original 22 ml foam to 40 ml. Continue stirring for 5 min and cool down to room temperature.

[0034] (3) When the temperature drops to room temperature, 2 ml of formaldehyde is added to react for 20 min. Pour the hydrogel into a mold at 60 °C and cure for 12 h, remove, repeatedly soak in water, squeeze, remove the unreacted monomers, wash to neutral. Drying a...

Embodiment 3

[0036] (1) Add 2.0g PVA to the three-neck flask, then add 18g of water, stir at 95 °C in an oil bath pot to dissolve completely, and mix into a 10wt% aqueous PVA solution. Then add 1.5g of black talc powder and stir for 2h to form a black talc / PVA homogeneous emulsion. Cool down to 72°C.

[0037] (2) Weigh 0.15g hexane and 1.5g sodium bicarbonate in a 10ml centrifuge tube, add 3ml of water and shake to evenly blister. The foaming solution is added to the black talc / PVA homogeneous emulsion cooled to 72 °C and stirred until the sodium bicarbonate is dissolved in the mixed solution, and the emulsion is expanded from the original 25 ml foam to 55 ml. Continue stirring for 5 min and cool down to room temperature

[0038] (3) When the temperature drops to room temperature, 2 ml of formaldehyde is added to react for 30 min. Pour the hydrogel into a mold at 60 °C and cure for 12 h, remove, repeatedly soak in water, squeeze, remove the unreacted monomers, wash to neutral. Dry at room temp...

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Abstract

The invention discloses a black talc-polyvinyl formal gel composite adsorption material and a preparation method thereof, belonging to the technical field of dye adsorption preparation. The specific method is: dissolve polyvinyl alcohol, then add hexane / sodium bicarbonate mixture, stir and foam, then add black talc powder with a particle size of about 300nm, stir and mix well, then add formaldehyde to react and cross-link to prepare a hydrogel glue composite material, and finally cured and shaped in an oven to obtain a black talc-polyvinyl formal gel composite adsorption material. The black talc-polyvinyl formal composite gel of the present invention can not only fix / adsorb the dye, but also has excellent water absorption, swelling and compression properties, and overcomes the technical problem that the adsorbent is difficult to recycle in the prior art; the method is simple , easy to operate and has broad application prospects.

Description

Technical field [0001] The present invention belongs to the field of dye wastewater treatment, specifically relates to a kind of black talc - polyvinyl alcohol formaldehyde gel composite adsorption material and preparation method and application thereof. Background [0002] Water pollution is an important environmental concern of global concern. Research on water pollution, especially dye wastewater, has attracted widespread attention because it affects aquatic life and humans. Because dyes are toxic, non-biodegradable and even carcinogenic, once they are discharged into the water, they pose a serious threat to the balance of the ecological environment. Therefore, the removal of dye wastewater is essential to prevent environmental pollution. [0003] As a kind of talc, black talc also has a 2:1 type (T-O-T type) layered structure of talc, composed of two silica-oxygen tetrahedral sheets (T) and a magnesium-oxygen octahedron (O), and the talc single layer T-O-T layer is 9.4A, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/28B01J20/26B01J20/30C02F1/28C02F101/30
CPCB01J20/28047B01J20/267B01J20/10B01J20/28011C02F1/285C02F1/281C02F2101/308
Inventor 张国亮何蓝天李雄孟琴
Owner ZHEJIANG UNIV OF TECH
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