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Multilevel-structure hydrotalcite adsorbent and preparation method thereof

A technology of structural water and adsorbent, which is applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants, etc., can solve the problem of product form limiting the in-depth application of hydrotalcite, and achieve excellent adsorption performance, low cost, and easy operation simple effect

Inactive Publication Date: 2011-02-16
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydrotalcite products prepared by the above methods are all flat and rigid sheet structures, and this single product shape limits the in-depth application of hydrotalcite in this field.

Method used

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  • Multilevel-structure hydrotalcite adsorbent and preparation method thereof
  • Multilevel-structure hydrotalcite adsorbent and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0018] Step A: Dissolve sodium dodecylsulfonate (SDS) in 80 mL deionized water in a 100 mL polytetrafluoroethylene liner to prepare an aqueous solution with a molar concentration of SDS of 0.010 mol / L, and the water temperature is 60°C.

[0019] Step B: under rapid stirring, Mg(NO 3 ) 2 and urea (Urea) are dissolved in a solution, and then Al(NO 3 ) 3 , stir the mixture for 2-3 minutes, so that the Mg in the reaction mixture 2+ / Al 3+ The initial molar ratio of / SDS / Urea is: 2 / 1 / 1 / 10.

[0020] Step C: The reaction mixture obtained in b is placed in a pressure vessel, and statically crystallized at 150° C. for 24 hours. The resulting final product slurry was washed with deionized water and absolute ethanol, filtered and dried to give the product as a white solid powder.

[0021] Known by elemental analysis, the chemical composition of the product is [Mg 2+ 0.67 Al 3+ 0.33 (OH) 2 ] 0.33+ (DS - ) 0.33 0.57H 2 O, where, DS - For dodecylsulfonate anion. It can be s...

Embodiment 2

[0023] Step A: Dissolve sodium dodecylsulfonate (SDS) in 80 mL deionized water in a 100 mL polytetrafluoroethylene liner to prepare an aqueous solution with a molar concentration of SDS of 0.015 mol / L, and the water temperature is 60°C.

[0024] Step B: under rapid stirring, Mg(NO 3 ) 2 and urea (Urea) are dissolved in a solution, and then Al(NO 3 ) 3, stir the mixture for 2-3 minutes, so that the Mg in the reaction mixture 2+ / Al 3+ The initial molar ratio of / SDS / Urea is: 2 / / 1 / 1.5 / 10.

[0025] Step C: The reaction mixture obtained in b is placed in a pressure vessel, and statically crystallized at 150° C. for 24 hours. The resulting final product slurry was washed with deionized water and absolute ethanol, filtered and dried to give the product as a white solid powder.

[0026] Known by elemental analysis, the chemical composition of the product is [Mg 2+ 0.65 al 3+ 0.35 (OH) 2 ] 0.35+ (DS - ) 035 0.55H 2 O, where, DS - For dodecylsulfonate anion. It can be ...

Embodiment 3

[0028] Step A: Dissolve sodium dodecylsulfonate (SDS) in 80 mL deionized water in a 100 mL polytetrafluoroethylene liner to prepare an aqueous solution with a molar concentration of SDS of 0.0175 mol / L, and the water temperature is 60°C.

[0029] Step B: under rapid stirring, Mg(NO 3 ) 2 and urea (Urea) are dissolved in a solution, and then Al(NO 3 ) 3 , stir the mixture for 2-3 minutes, so that the Mg in the reaction mixture 2+ / Al 3+ The initial molar ratio of / SDS / Urea is: 2 / / 1 / 1.75 / 10.

[0030] Step C: The reaction mixture obtained in b is placed in a pressure vessel, and statically crystallized at 150° C. for 24 hours. The resulting final product slurry was washed with deionized water and absolute ethanol, filtered and dried to give the product as a white solid powder.

[0031] Known by elemental analysis, the chemical composition of the product is [Mg 2+ 0.64 al 3+ 0.36 (OH) 2 ] 0.36+ (DS - ) 0.36 0.53H 2 O, where, DS - For dodecylsulfonate anion. It can...

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Abstract

The invention discloses a multilevel-structure hydrotalcite adsorbent and a preparation method thereof, and belongs to the technical field of synthesis of organic-inorganic supermolecule hybrid materials. The hydrotalcite adsorbent has an integral spherical fold structure which has a primary-particle platelike bending layer and a surfactant anion interlayer. The chemical formula is [M2+1-xM3+x(OH)2]x+(An-)x / n.mH2O, wherein An- is the interlayer anion, M2+ is Mg2+, M3+ is Al3+, and x is the mol ratio of M3+ / (M2++M3+). The preparation method is realized by adopting a urea static crystallization process in a way that: in a anionic surfactant water solution, under the interface induction action of the anionic surfactant vesicle template and the interlayer action between the hydrotalcite veneers, regulating the concentration, crystallization temperature and crystallization time of the anionic surfactant water solution to directly synthesize the multilevel-structure hydrotalcite adsorbent in one step. The multilevel-structure hydrotalcite adsorbent has excellent adsorbability for organic pollutants in the water solution.

Description

technical field [0001] The invention relates to a multi-stage structure hydrotalcite adsorbent and a preparation method thereof. The adsorbent has high-efficiency adsorption performance for organic pollutants in waste water, and belongs to the technical field of synthesis of organic-inorganic supramolecular hybrid materials. Background technique [0002] In recent decades, with the continuous increase of industrial sewage and domestic sewage, water pollution has become increasingly serious, and the content of various pollutants in wastewater has greatly exceeded the standard, causing great harm to the environment and human health. To solve this problem, various organic or inorganic adsorbent materials have been developed. Such as common activated carbon, molecular sieve and mesoporous silicon materials. As adsorbents, they all have a good mesoporous structure and can efficiently adsorb adsorbates. However, the selective adsorption performance needs to be further improved, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F101/30B01J20/22B01J20/30B01J20/28
Inventor 何静王爱
Owner BEIJING UNIV OF CHEM TECH
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