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Nuclear shell structure mesoporous heavy metal ion adsorbent capable of magnetic separation and preparation method thereof

A heavy metal ion and core-shell structure technology, applied in the field of mesoporous adsorption materials, can solve the problems of low efficiency, complicated operation and high cost of filtration separation and centrifugal separation

Inactive Publication Date: 2010-06-16
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to solve the problems of low filtration efficiency, complicated operation and high cost of the simple mesoporous material for filtration separation and centrifugation

Method used

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  • Nuclear shell structure mesoporous heavy metal ion adsorbent capable of magnetic separation and preparation method thereof
  • Nuclear shell structure mesoporous heavy metal ion adsorbent capable of magnetic separation and preparation method thereof
  • Nuclear shell structure mesoporous heavy metal ion adsorbent capable of magnetic separation and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] 1. Preparation of core-shell structure mesoporous heavy metal ion adsorbent (1)

[0030] (1) Synthesis of α-Fe 2 o 3 particles

[0031] Dissolve ferric chloride in deionized water at a concentration of 2.0×10 -2 M, add hydrochloric acid solution, its concentration is: 1×10 -3 M, hydrothermal treatment, the temperature is 100°C, the time is 24h, centrifuged, washed several times with deionized water.

[0032] (2) Coating dense silicon oxide intermediate layer

[0033] Disperse α-iron oxide particles in a mixed solution of isopropanol, deionized water and ammonia water, add tetraethyl orthosilicate, and its concentration range is: 1×10 -3 ~1×10 -2 M, stirred for 5-10 hours, centrifuged and washed several times with ethanol.

[0034] (3) Coated with silicon oxide mesoporous layer

[0035] Disperse the particles coated with the dense silicon oxide intermediate layer in a mixed solution of ethanol, deionized water, and ammonia water, and add a mixed solution of ethyl...

Embodiment 2

[0068] Basic technique is identical with example 1, only changes silane coupling agent to be mercaptosilane (CH 3 O) 3 Si(CH 2 ) 3 SH, to obtain the prepared mercapto-modified adsorbent S-MCMS.

[0069] Its nitrogen adsorption-desorption isotherm shows that after the modification of the mercaptosilane coupling agent, the mesoporous channels of the material still remain good (see figure 2 c and image 3 c). Its transmission electron microscope pictures ( Figure 5 ) showed that after modifying the silane coupling agent, the material maintained a magnetic core-mesoporous shell structure with good dispersion.

[0070] After the adsorbent S-MCMS treats the simulated wastewater, the Hg in the wastewater 2+ , Pb 2+ , Cd 2+ , Zn 2+ , Cu 2+ Concentrations were significantly reduced (Table 1), indicating that the adsorbent has good adsorption properties for common metal ions in wastewater.

Embodiment 3

[0072] Basic technique is identical with example 1, and only changing silane coupling agent is ethylaminosilane (CH 3 O) 3 Si(CH 2 ) 3 NH(CH 2 ) 2 NH 2 , to obtain the prepared amino-modified adsorbent N-MCMS.

[0073] Its nitrogen adsorption-desorption isotherm shows that after the aminosilane coupling agent is modified, the mesoporous pores of the material still remain good (see figure 2 d and image 3 d). Its transmission electron microscope pictures ( Image 6 ) showed that after modifying the silane coupling agent, the material maintained a magnetic core-mesoporous shell structure with good dispersion.

[0074] After the adsorbent N-MCMS treats the simulated wastewater, the Hg in the wastewater 2+ , Pb 2+ , Cd 2+ , Zn 2+ , Cu 2+ Concentrations were significantly reduced (Table 1), indicating that the adsorbent has good adsorption properties for common metal ions in wastewater.

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Abstract

The invention relates to the field of mesoporous adsorbing materials, in particular to a nuclear shell structure mesoporous heavy metal ion adsorbent capable of magnetic separation. The adsorbent has the following structure: ferroferric oxide particles are used as core particles, amorphous silicon oxide is used as an external mesoporous layer, and a compact silicon oxide intermediate layer exists between the core and the mesoporous layer. The invention also provides a method for preparing the adsorbent. The invention can solve the problems of low filtration separation and centrifugal separation efficiency, complex operation and high cost of the simple mesoporous material, can separate the following materials in wastewater, i.e. can adsorb Hg<2+>, Pb<2+>, Cd<2+>, Zn<2+> and Cu<2+> in the wastewater, and can selectively adsorb the Hg<2+> in the wastewater.

Description

technical field [0001] The invention relates to a mesoporous adsorption material, in particular to a magnetically separable core-shell structure mesoporous heavy metal ion adsorbent and a preparation method thereof. Background technique [0002] Today, with the high prosperity and development of the modern industrial economy, the problem of environmental pollution has increasingly become a serious problem that has to be paid attention to. Among them, due to its huge toxicity, heavy metal pollution seriously threatens the living environment of human beings and the ecosystem of the whole earth. The tragedy caused by heavy metal water pollution has been frequently reported. Therefore, the treatment of heavy metal water pollution has increasingly become an important topic in many scientific research fields, including the research and development of heavy metal ion adsorbents and ion exchangers. [0003] In recent years, mesoporous materials have become a new type of porous adso...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01J20/28B01J20/30B01J13/02H01F1/11
Inventor 赵文茹施剑林
Owner EAST CHINA UNIV OF SCI & TECH
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