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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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 ex

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
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Example Embodiment

[0029] Example 1

[0030] (1) Weigh 8.66g (0.032mol) FeCl respectively 3 ·6H 2 O and 5.56g (0.002mol) FeSO 4 ·7H 2 O, dissolved in 100mL deionized water, its molar concentration is higher than Fe 3+ : Fe 2+ =1.6:1, add 100mL polyethylene glycol solution, disperse ultrasonically at 25°C, slowly add ammonia water dropwise at a flow rate of 150mL / min under nitrogen protection to make the reaction system alkaline to pH 11, stir at 60°C It is heated in a water bath at 400 revolutions per minute, stirred at a constant temperature for 2 hours, rinsed with deionized water to neutrality, and dried under vacuum at 60° C. for 10 hours to prepare Fe3O4 nanoparticles.

[0031] (2) Weigh 2.0 g of ferroferric oxide nanoparticles prepared in step (1), and ultrasonically disperse them in 50 mL of deionized water at 25°C, and then first ultrasonically disperse 1.80 mL of ethyl orthosilicate in 80 mL of methanol. 5mL ammonia water was added to the above reaction system together, at 25℃, stirring spee...

Example

[0042] Examples 2-12

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

[0044] Table 2 Raw material components and specific parameters of Examples 1-12 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

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Claims

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Application Information

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Owner ZHEJIANG UNIV
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