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Method for preparing bifunctional mesoporous silica for adsorbing heavy metal ions in water

A technology of mesoporous silica and heavy metal ions, applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve the problem of adsorption and removal of heavy metal ions in water without dual-functional large-aperture mesoporous materials. and other issues, to achieve good application prospects, reduce production costs, and reduce pollution effects

Active Publication Date: 2014-11-19
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far there is no report about the use of TMB as a pore-enlarging agent, triaminosilane and disodium EDTA as a modifier to synthesize a bifunctional large-pore mesoporous material, and there is no report about the dual-functional large-pore mesoporous material for adsorption and removal of water. Research report on heavy metal ions

Method used

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  • Method for preparing bifunctional mesoporous silica for adsorbing heavy metal ions in water
  • Method for preparing bifunctional mesoporous silica for adsorbing heavy metal ions in water
  • Method for preparing bifunctional mesoporous silica for adsorbing heavy metal ions in water

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Embodiment 1

[0027] Synthesis of embodiment 1 large-aperture mesoporous silica

[0028] Add 4 g of structure directing agent P123 (polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer) into 150 mL (1.6 mol / L) of hydrochloric acid, stir for 2 h until the solution is clear, and raise the temperature to After reaching 40°C, add TMB (1,3,5-trimethylbenzene), said TMB / P123=1:5, react for 6 hours and use a constant pressure dropping funnel under rapid stirring (450r / min) for 6-9 Add 8.5g TEOS (tetraethyl orthosilicate) dropwise at a rate of 1 second / drop, continue to react at the same stirring speed for 24 hours, then transfer to a polytetrafluoroethylene high-pressure digestion tank, crystallize at 100°C for 24 hours, vacuum filter, and dry Dry the white powder, and dry the white powder with absolute ethanol and a small amount of concentrated hydrochloric acid at 98.5°C (the volume ratio of absolute ethanol and concentrated hydrochloric acid is 200:1), and extract it wit...

Embodiment 2 3

[0029] Example 2 Preparation of triamino-modified large-aperture mesoporous silica

[0030] Add 1.5-2.5g of mesoporous silica prepared in step 1 into a 250mL flat-bottomed flask filled with 50-100mL of toluene and mix evenly, add 3.5-4.5mmol of triaminosilane coupling agent, mix well, heat to reflux for 10h, Cool, then vacuum filter, wash with absolute ethanol 2-3 times, and dry in an oven at 80-120°C for 10-15h to obtain a sample.

[0031] After drying the sample prepared above, use 120ml of dichloromethane / diethyl ether mixture, and extract it with a Soxhlet extractor at 80°C for 8h, and dry the obtained solid at 100°C for 12h to obtain the triamino-modified of mesoporous silica.

Embodiment 3

[0032] Example 3 Preparation of bifunctional large-aperture mesoporous silica

[0033] The triamino-modified mesoporous silica (2.2 g) prepared in step 2 was added to 60 mL (0.1 mol / L) disodium ethylenediaminetetraacetic acid (disodium EDTA) aqueous solution, and stirred at room temperature for 24 h. Suction filtration, washing several times with ultrapure water, and drying to obtain the final product.

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Abstract

The invention discloses a method for preparing bifunctional mesoporous silica for adsorbing heavy metal ions in water. The method comprises the following steps: P123 is used as a structure-directing agent, mesitylene is used as a hole-enlarging agent, and mesoporous silica with large hole diameter is prepared by adopting a hydrothermal synthesis method; then, a post-grafting method is adopted, a triamine silane coupling agent (3-[2-(2-Aminoethylamino)ethylamino]propyl-trimethoxysilane) and disodium edetate dihydrate are successively used as a modifying agent, and finally the bifunctional mesoporous silica with the large hole diameter is synthesized. The adsorbent preparation process is mild in production condition and is conducted at room temperature, and other chemical reagents are not needed. The adsorption effect is good, and production cost is reduced. Meanwhile, environmental pollution is reduced, and the bifunctional mesoporous silica has a good application prospect.

Description

technical field [0001] The patent of the present invention relates to a preparation method of bifunctional mesoporous silica for absorbing heavy metal ions in water. Background technique [0002] With the acceleration of industrialization and modernization, a large amount of industrial wastewater containing heavy metal ions and urban domestic sewage are directly discharged outside without treatment, which makes the concentration of heavy metals in various water bodies increase sharply, resulting in more and more polluted water bodies. The degree of pollution is gradually increasing. The pollution of heavy metals in water seriously threatens the survival and safety of human beings and aquatic organisms. Therefore, how to control water heavy metal pollution is an important environmental protection work. Traditional treatment technologies for heavy metal wastewater mainly include chemical precipitation, ion exchange, membrane separation, and biochemical methods. The surface ...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F1/62
Inventor 魏建文吴艺巧王敦球廖雷宋红军
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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