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Modified silica nano-adsorbent and preparation method and application thereof

A nano-adsorption and silicon dioxide technology, applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal oxides/hydroxides, etc., can solve problems such as limited adsorption capacity, high carbon consumption, and poor selectivity , to achieve the effect of low cost, secondary pollution and stable performance

Active Publication Date: 2018-07-10
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Adsorption method is currently the most widely used method for extracting palladium. It has many advantages such as high efficiency, simple equipment and operation, regenerable and reusable adsorbent, and less environmental pollution. Commonly used adsorbents include activated carbon and ion exchange resin, among which activated carbon adsorption Due to limited adsorption capacity, poor selectivity, high carbon consumption, palladium loss due to crushing and wear, the application is limited
The ion exchange resin is superior to activated carbon in terms of adsorption speed and saturated palladium loading, and the resin has the characteristics of high mechanical strength, wear resistance, extrusion resistance and easy desorption, but it cannot selectively extract palladium.

Method used

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  • Modified silica nano-adsorbent and preparation method and application thereof
  • Modified silica nano-adsorbent and preparation method and application thereof
  • Modified silica nano-adsorbent and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The modified nano-silica adsorbent has a structural formula of:

[0028] , where For nano-silica particles.

[0029] The preparation method of this modified nano silicon dioxide adsorbent, its concrete steps are as follows:

[0030] (1) Add nano-silica particles to V at a liquid-solid ratio of 10:1ml / g （无水乙醇） :V （水） Add vinyltriethoxysilane to the mixed solution of 1:1 (the liquid-solid ratio of vinyltriethoxysilane to nano silica particles is 1.5:1ml / g), and reflux at 70°C for 40h After liquid-solid separation, the solid matter was taken out, washed with absolute ethanol, centrifuged and dried in vacuum, and the obtained product was labeled as TXL-SNPs.

[0031] (2) Add the TXL-SNPs obtained in step (1) into N,N-dimethylformamide solution (DMF) dissolved in acrylonitrile (the liquid-solid ratio of TXL-SNPs to acrylonitrile is 3:1ml / g, The liquid-solid ratio of N,N-dimethylformamide solution to TXL-SNPs is 46:1 ml / g), adding azobisisobutyronitrile, wherein the m...

Embodiment 2

[0036] The modified nano-silica adsorbent has a structural formula of:

[0037]

[0038] The preparation method of this modified nano silicon dioxide adsorbent, its concrete steps are as follows:

[0039] (1) Add nano-silica particles to V at a liquid-solid ratio of 17:1 ml / g （无水乙醇） :V （水） Add vinyltriethoxysilane to the mixed solution of 1:1 (the liquid-solid ratio of vinyltriethoxysilane to nano silica particles is 1:1ml / g), and reflux at 60°C for 50h After liquid-solid separation, the solid matter was taken out, washed with absolute ethanol, centrifuged and dried in vacuum, and the obtained product was labeled as TXL-SNPs.

[0040] (2) Add the TXL-SNPs obtained in step (1) to N,N-dimethylformamide solution (DMF) dissolved in acrylonitrile (the liquid-solid ratio of TXL-SNPs to acrylonitrile is 4:1ml / g, The liquid-solid ratio of N,N-dimethylformamide solution to TXL-SNPs is 50:1 ml / g), adding azobisisobutyronitrile, wherein the mass ratio of azobisisobutyronitrile to T...

Embodiment 3

[0045] The modified nano-silica adsorbent has a structural formula of:

[0046]

[0047] The preparation method of this modified nano silicon dioxide adsorbent, its concrete steps are as follows:

[0048] (1) Add nano-silica particles to V at a liquid-solid ratio of 15:1 ml / g （无水乙醇） :V （水） Add vinyltriethoxysilane to the mixed solution of 1:1 (the liquid-solid ratio of vinyltriethoxysilane to nano silica particles is 2:1ml / g), and reflux at 65°C for 45h After liquid-solid separation, the solid matter was taken out, washed with absolute ethanol, centrifuged and dried in vacuum, and the obtained product was labeled as TXL-SNPs.

[0049] (2) Add the TXL-SNPs obtained in step (1) into N,N-dimethylformamide solution (DMF) dissolved in acrylonitrile (the liquid-solid ratio of TXL-SNPs to acrylonitrile is 5:1ml / g, The liquid-solid ratio of N,N-dimethylformamide solution to TXL-SNPs is 48:1ml / g), adding azobisisobutyronitrile, wherein the mass ratio of azobisisobutyronitrile to ...

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PUM

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Abstract

The invention discloses a modified silica nano-adsorbent and a preparation method and application thereof and belongs to the technical field of nano-material preparation. The preparation method comprises adding nano-silica particles into a mixed solution with a volume ratio of anhydrous ethanol to water of 1: 1, adding vinyl triethoxysilane into the mixed solution, carrying out refluxing for a reaction, carrying out liquid-solid separation, washing and centrifugation, carrying out vacuum drying to obtain TXL-SNPs, adding the TXL-SNPs into an N, N-dimethylformamide solution of acrylonitrile, adding azobisisobutyronitrile into the mixed solution, carrying out refluxing in a nitrogen atmosphere for a reaction, carrying out liquid-solid separation, washing the separated solids, carrying out vacuum drying to obtain ALT-SNPs, mixing the ALT-SNPs and sulfur powder, adding the mixture into a mixed solution of ethylenediamine and toluene, carrying out refluxing for a reaction, carrying out solid-liquid separation, taking out solids, washing the solids with ethanol and distilled water, carrying out centrifugation, and then carrying out vacuum drying to obtain the modified silica nano-adsorbent ELD-SNPs. The modified silica nano-adsorbent can adsorb palladium ions in an acidic solution, utilizes raw materials with a low cost, is prepared through simple processes, can be easily separated from water, has high adsorption effects and can be reused.

Description

technical field [0001] The invention relates to a modified silicon dioxide nano-adsorbent and its preparation method and application, belonging to the technical field of nano-material preparation. Background technique [0002] Palladium reserves are scarce on the earth, and it is difficult to mine and smelt it. It belongs to the series of rare and precious metals. Palladium is an indispensable key material in high-tech fields such as aerospace, aviation, navigation, weapons and nuclear energy, as well as automobile manufacturing. It is also an investment product that cannot be ignored in the international precious metal investment market. [0003] Adsorption method is currently the most widely used method for extracting palladium. It has many advantages such as high efficiency, simple equipment and operation, regenerable and reusable adsorbent, and less environmental pollution. Commonly used adsorbents include activated carbon and ion exchange resin, among which activated ca...

Claims

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Application Information

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IPC IPC(8): B01J20/28B01J20/22C02F1/28C08F292/00C08F220/44C08F8/48C02F101/20
CPCB01J20/103B01J20/226C02F1/28C02F1/281C02F1/285C08F8/48C08F292/00B01J20/28007C02F2101/20C08F220/44
Inventor 王仕兴张冰彭金辉张利波付立康
Owner KUNMING UNIV OF SCI & TECH