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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  • Summary
  • 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 meso

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

Examples

Experimental program
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Example Embodiment

[0027] Example 1 Synthesis of large pore size mesoporous silica

[0028] Add 4g of structure-directing agent P123 (polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer) to 150mL (1.6mol / L) hydrochloric acid, stir for 2h until the solution is clear, and increase the temperature After reaching 40℃, add TMB (1,3,5-trimethylbenzene), the TMB / P123=1:5, after 6h reaction, under rapid stirring (450r / min), use constant pressure dropping funnel to 6-9 Drop 8.5g TEOS (ethyl orthosilicate) at a rate of sec / drop, continue to react for 24h at the same stirring speed, then transfer to a polytetrafluoroethylene high-pressure digestion tank, crystallize at 100℃ for 24h, vacuum filter, and bake White powder is obtained by drying, and the dried white powder is extracted by Soxhlet with a Soxhlet extractor at 98.5℃ (the volume ratio of absolute ethanol and concentrated hydrochloric acid is 200:1) at 98.5°C, Vacuum filtration, washing with ultrapure water 3-4 times, and dryi...

Example Embodiment

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

[0030] Add 1.5-2.5g of the mesoporous silica prepared in step 1 to a 250mL flat-bottomed flask containing 50-100mL of toluene and mix well, add 3.5-4.5mmol of triaminosilane coupling agent, mix well, and 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 10-15 hours to obtain samples.

[0031] After drying the sample prepared above, use 120ml of dichloromethane / ether mixture to extract 8h with a Soxhlet extractor at 80℃. The obtained solid is dried at 100℃ for 12h to obtain triamino modification. Of mesoporous silica.

Example Embodiment

[0032] Example 3 Preparation of dual-functionalized large-pore 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 EDTA (disodium EDTA) aqueous solution, and stirred at room temperature for 24 h. Filter by suction, wash several times with ultrapure water, and dry 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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