Surface modified silicon dioxide material, preparation method and application thereof

A technology of silica and surface modification, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problems of small adsorption capacity and inability to meet application requirements, and achieve high adsorption capacity, wide application value and economical Value, effect of simple preparation method

Active Publication Date: 2016-10-26
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adsorption capacity of unmodified silica nanomaterials is small and cannot meet the application requirements, so modified nano silica is widely used in sewage treatment

Method used

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  • Surface modified silicon dioxide material, preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation method of the surface-modified silica material described in this embodiment specifically includes the following steps:

[0027] (1) Put nano silicon dioxide (particle size 20nm) into ethanol, the liquid-solid ratio of ethanol to silicon dioxide is 20:1, then add 3-(2,3-epoxypropoxy)propyltrimethyl Oxysilane, the liquid-solid ratio of 3-(2,3-glycidoxy)propyltrimethoxysilane to silicon dioxide is 3:1, reflux reaction at 75°C, and the obtained product is marked as GPTMS -SiO 2 .

[0028] (2) The GPTMS-SiO will be obtained 2 Put in ethanol, add polyethyleneimine, polyethyleneimine and GPTMS-SiO 2 The mass ratio of ethanol to silicon dioxide is 1:1, and the liquid-solid ratio of ethanol to silicon dioxide is 20:1; the reaction is refluxed at 70°C, and the obtained product is labeled as PEI-SiO 2 ;

[0029] (3) PEI-SiO will be obtained after 2 Put in distilled water, then add sodium bromoethylsulfonate and sodium hydroxide, sodium bromoethylsulfonate and...

Embodiment 2

[0035] The preparation method of the surface-modified silica material described in this embodiment specifically includes the following steps:

[0036] (1) Put nano silicon dioxide (particle size 40nm) into ethanol, the liquid-solid ratio of ethanol to silicon dioxide is 15:1, and then add 3-(2,3-epoxypropoxy)propyltrimethyl Oxysilane, the liquid-solid ratio of 3-(2,3-epoxypropoxy)propyltrimethoxysilane to silicon dioxide is 2:1, reflux reaction at 70°C, and the obtained product is marked as GPTMS -SiO 2 .

[0037] (2) The GPTMS-SiO will be obtained 2 Put in ethanol, add polyethyleneimine, polyethyleneimine and GPTMS-SiO 2 The mass ratio of ethanol to silicon dioxide is 1.5:2, and the liquid-solid ratio of ethanol to silicon dioxide is 15:1; the reaction is refluxed at 65°C, and the obtained product is labeled as PEI-SiO 2 .

[0038] (3) The resulting PEI-SiO 2 Put in distilled water, then add sodium bromoethylsulfonate and sodium hydroxide, sodium bromoethylsulfonate and...

Embodiment 3

[0044] The preparation method of the surface-modified silica material described in this embodiment specifically includes the following steps:

[0045] (1) Put nano silicon dioxide (particle size 30nm) into ethanol, the liquid-solid ratio of ethanol to silicon dioxide is 10:1, then add 3-(2,3-epoxypropoxy)propyltrimethyl Oxysilane, the liquid-solid ratio of 3-(2,3-glycidoxypropoxy)propyltrimethoxysilane to silicon dioxide is 1:1, reflux reaction at 65°C, and the obtained product is marked as GPTMS -SiO 2 .

[0046] (2) The GPTMS-SiO will be obtained 2 Put in ethanol, add polyethyleneimine, polyethyleneimine and GPTMS-SiO 2 The mass ratio of ethanol to silicon dioxide is 1:2, and the liquid-solid ratio of ethanol to silicon dioxide is 10:1; the reaction is refluxed at 60°C, and the obtained product is labeled as PEI-SiO 2 .

[0047] (3) The resulting PEI-SiO 2 Put in distilled water, then add sodium bromoethylsulfonate and sodium hydroxide, sodium bromoethylsulfonate and P...

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Abstract

The invention discloses a surface modified silicon dioxide material, a preparation method and application thereof and belongs to the technical field of a compound material. The method provided by the invention comprises the following steps of: adding nanometer silicon dioxide into ethyl alcohol, and then adding 3-(2,3-epoxy propoxy) propyl trimethoxy silane and performing backflow reaction, thereby acquiring GPTMS-SiO2; putting GPTMS-SiO2 into ethyl alcohol, adding polymine and performing backflow reaction, thereby acquiring PEI-SiO2; and putting the acquired PEI-SiO2 into distilled water, and then adding sodium 2-bromoethanesulphonate and sodium hydroxide, performing backflow reaction at 70 DEG C, centrifugally separating and drying, thereby acquiring the surface modified nanometer silicon dioxide. The nanometer material prepared according to the invention can selectively absorb silver ions in aqueous solution and can be widely applied to the recycling treatment of silver ions in industrial waste water.

Description

technical field [0001] The invention discloses a surface-modified silicon dioxide material, a preparation method and application thereof, and belongs to the technical field of composite materials. Background technique [0002] As a precious metal, silver is widely used in the fields of electronics, electroplating, photosensitive materials, chemical industry, environmental monitoring, medicine, aerospace and scientific research, and produces a large amount of wastewater containing silver ions. However, silver ions have high toxicity to aquatic organisms, can accumulate in the human body, and cause serious harm to the human body, and because silver has a high value, silver recovery from various silver-containing wastewater has become a Very important question. [0003] Silver recovery methods usually include reduction method, electrolysis method, metal replacement method, ion exchange method, air flotation method, sulfide precipitation method and other methods. However, thes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30C02F1/28C02F101/20
CPCB01J20/103C02F1/281C02F2101/20
Inventor 张利波张耕玮王仕兴崔维付立康廖雪峰
Owner KUNMING UNIV OF SCI & TECH
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