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Preparation method of thiol-functionalized magnetic silica nano-material

A technology of silica and nanomaterials, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of limited application and promotion, long reaction cycle, high energy consumption for preparation, and achieve Good selectivity, short reaction time and simple preparation process

Inactive Publication Date: 2014-02-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The mercapto-functionalized magnetic nanomaterials prepared by the above method have a good adsorption effect on Hg(II), and can be quickly and effectively separated from wastewater under the action of an external magnetic field, but the common problems are high energy consumption and long reaction cycle. , cumbersome operation and other shortcomings, which limit its application and promotion in practical engineering

Method used

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  • Preparation method of thiol-functionalized magnetic silica nano-material
  • Preparation method of thiol-functionalized magnetic silica nano-material
  • Preparation method of thiol-functionalized magnetic silica nano-material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Weigh 8.66g (0.032mol) FeCl respectively 3 ·6H 2 O and 5.56 g (0.002 mol) FeSO 4 ·7H 2 O, dissolved in 100mL deionized water, its molar concentration is higher than that of Fe 3+ : Fe 2+ =1.6:1, add 100mL polyethylene glycol solution, ultrasonically disperse at 25°C, and slowly add ammonia water dropwise under nitrogen protection at a flow rate of 150mL / min to make the reaction system alkaline until the pH is 11. Heating in a water bath at 400 rpm, stirring at a constant temperature for 2 hours, washing with deionized water until neutral, and vacuum drying at 60°C for 10 hours to obtain ferric oxide nanoparticles.

[0031] (2) Weigh 2.0 g of ferric oxide nanoparticles prepared in step (1), ultrasonically disperse them in 50 mL of deionized water at 25 °C, then ultrasonically disperse 1.80 mL of tetraethyl orthosilicate in 80 mL of methanol, and Add 5mL of ammonia water to the above reaction system together, at 25°C, at a stirring speed of 400 rev / min, ultrasoni...

Embodiment 2～12

[0043] The operating steps of Examples 2-12 are the same as those in Example 1, and the raw material components and specific parameters are shown in Table 2. The mercapto-functionalized magnetic silica nanomaterial samples prepared in Examples 2-12 were characterized by transmission electron microscopy (TEM), infrared (FTIR) and other means, and used for the adsorption test of Hg(II) in simulated wastewater in the laboratory.

[0044] Table 2 The raw material components and specific parameters of Examples 1 to 12 of the present invention

[0045]

[0046]

[0047]

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Abstract

The invention belongs to the technical field of functionalized magnetic nano-materials, and especially relates to a preparation method of a thiol-functionalized magnetic silica nano-material. The preparation method comprises the following steps: carrying out a co-precipitation method of raw materials comprising a ferric salt and a ferrous salt to prepare super-paramagnetic ferriferrous oxide particles; wrapping the bare ferriferrous oxide nano-particles by treating a silane cross-linking agent as a silicon source through an improved sol-gel method to obtain a magnetic silica carrier; and carrying out functional modification of the surface of the carrier by a silane coupling agent to obtain the thiol-functionalized magnetic silica nano-material. The preparation method has the advantages of less consumption of organic solvents, mild reaction conditions, short reaction time, simple preparation process, less energy consumption, low cost and the like, and the finally obtained product has an average particle size of 20-30nm, and has a good selectivity and a high adsorption capacity when the product is used in the absorption of Hg (II) in wastewater.

Description

technical field [0001] The invention belongs to the technical field of functionalized magnetic nanometer materials, and in particular relates to a preparation method of mercapto functionalized magnetic silicon dioxide nanomaterials. The mercapto-functionalized magnetic silicon dioxide nanometer material prepared by the invention can effectively absorb and remove mercury ions in waste water and achieve the purpose of harmless treatment. Background technique [0002] Heavy metal pollution is one of the most serious environmental pollution problems, especially in my country. In recent years, frequent incidents of heavy metal pollution have made the control and treatment of heavy metal pollution urgent. How to effectively and safely solve heavy metal pollution has become a hot research topic at present. At present, the methods commonly used to remove heavy metals in water mainly include: chemical precipitation method, redox treatment method, adsorption method, membrane separat...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/28B01J20/30C02F1/28
Inventor 胡运俊徐新华孙琛薛晓芹谭丽莎
Owner ZHEJIANG UNIV
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