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Preparation method of modified silicon dioxide hydrogel, modified silicon dioxide hydrogel and application of modified silicon dioxide hydrogel

A technology of silica and hydrogel, which is applied in the field of water pollution treatment, can solve the problems of low adsorption rate, difficult recovery, and high cost, and achieve the effects of improving adsorption performance, low cost, and increasing surface area

Inactive Publication Date: 2018-01-16
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a preparation method of modified silica hydrogel for the problems of low adsorption rate, difficult recovery and high cost of existing adsorbent materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Under 30°C and magnetic stirring, according to the volume ratio of ethyl orthosilicate, absolute ethanol, and ammonia water in a ratio of 1:10:1 and deionized water to mix evenly, according to the silane coupling agent and ethyl orthosilicate The volume ratio of γ-aminopropyl triethoxysilane is 1:10 drop by drop, and stirred at room temperature for 24h, the carboxylated nano-SiO can be obtained. 2 .

[0024] Under magnetic stirring, take 10ml of 1% sodium alginate to dissolve, according to the method of sodium alginate and modified SiO 2 The mass ratio is 1:1.5 to add modified SiO 2 , so that it is evenly dispersed in sodium alginate, and then add an appropriate amount of potassium persulfate and N,N-methylenebisacrylamide, stir for 10 minutes, pour it into a square grinding tool to form a gel, and fix it. Carboxy-modified SiO 2 Hydrogel, which can be cut into small cubes with a size of 1*1cm as needed. The prepared modified SiO 2 The removal rate of Cu(Ⅱ) by hydro...

Embodiment 2

[0026] Under 40°C and magnetic stirring, mix with deionized water evenly according to the volume ratio of ethyl orthosilicate, absolute ethanol, and ammonia water at a ratio of 1:20:1.2, and mix according to the ratio of silane coupling agent and ethyl orthosilicate The volume ratio of γ-aminopropyltriethoxysilane is 1:7.5 dropwise, and stirred at room temperature for 24h, the carboxylated nano-SiO can be obtained. 2 .

[0027] Under magnetic stirring, take 10ml of 2% sodium alginate to dissolve, according to the method of sodium alginate and modified SiO 2 The mass ratio of the modified SiO is 1:1.25 2 , so that it is evenly dispersed in sodium alginate, and then add an appropriate amount of ammonium persulfate and N,N,N,N-tetramethylethylenediamine, stir for 10 minutes, pour it into a square grinding tool to form a gel, and fix it After that, carboxy-modified SiO can be obtained 2 Hydrogel, which can be cut into small cubes with a size of 1*1cm as needed. The prepared mo...

Embodiment 3

[0029] Under 30°C and magnetic stirring, mix with deionized water evenly according to the volume ratio of ethyl orthosilicate, absolute ethanol, and ammonia water at a ratio of 1:20:1, and mix according to the ratio of silane coupling agent and ethyl orthosilicate The volume ratio of γ-aminopropyl triethoxysilane is 1:10 drop by drop, and stirred at room temperature for 24h, the carboxylated nano-SiO can be obtained. 2 .

[0030] Under magnetic stirring, take 10ml of 1% sodium alginate to dissolve, according to the method of sodium alginate and modified SiO 2 The mass ratio is 1:1 to add modified SiO 2 , so that it is evenly dispersed in sodium alginate, and then add an appropriate amount of potassium persulfate and N,N-methylenebisacrylamide, stir for 10 minutes, pour it into a square grinding tool to form a gel, and fix it. Carboxy-modified SiO 2 Hydrogel, which can be cut into small cubes with a size of 1*1cm as needed. The prepared modified SiO 2 The removal rate of C...

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Abstract

The invention relates to a preparation method of modified silicon dioxide hydrogel, the modified silicon dioxide hydrogel and application of the modified silicon dioxide hydrogel. The preparation method comprises the following steps: under a magnetic stirring condition, dissolving sodium alginate, then adding carboxyl-modified SiO2 nanoparticles, uniformly dispersing the SiO2 nanoparticles into sodium alginate, then adding proper amounts of an initiator and a crosslinking agent, stirring for 10 min, then pouring into a square mould to form a gel, fixing and moulding to obtain carboxyl-modifiedSiO2 hydrogel, and cutting the carboxyl-modified SiO2 hydrogel into small square blocks of 1*1 cm as required. A SiO2 hydrogel material effectively improves the stability of an adsorbent material, can be repeatedly used for multiple times, effectively reduces the cost and solves the adsorbent recycling problem. The modified SiO2 hydrogel provided by the invention is simple in preparation technology, low in cost, high in selectivity and high in adsorption capacity, and has a good application prospect in heavy metal treatment.

Description

technical field [0001] The invention relates to a preparation method of a modified silica hydrogel and its product and application, which can effectively improve the adsorption efficiency of heavy metal ions in waste water, solve the problem of adsorbent recovery, and be used in the field of water pollution treatment. Background technique [0002] With the accelerated development of industrialization and the intensification of human destructive activities, a large number of heavy metal ion pollutants are discharged into natural water bodies. These heavy metal ions cannot be degraded by microorganisms. If they exist for a long time, they will enter the human body through the food chain and cause serious harm to human health. Therefore, , it is of great significance to remove heavy metal ions in water. At present, the treatment methods of heavy metal wastewater at home and abroad mainly include: adsorption method, chemical precipitation method, ion exchange method, membrane se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/28B01J20/30C02F1/28C02F101/20
Inventor 何丹农童琴赵昆峰代卫国邓洁金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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