Preparation and application of hierarchical mesoporous γ-al2o3 nanostructured adsorbent

A nanostructure and adsorbent technology, applied in solid adsorbent liquid separation, separation methods, other chemical processes, etc., can solve problems such as product application performance that is not mentioned, and achieve controllable morphology, strong adsorption performance, and mild conditions. Effect

Inactive Publication Date: 2011-12-28
WUHAN UNIV OF TECH
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  • Description
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Problems solved by technology

However, this method does not further prepare a series of graded alumina by roasting, and does not mention the application performance of the product

Method used

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  • Preparation and application of hierarchical mesoporous γ-al2o3 nanostructured adsorbent
  • Preparation and application of hierarchical mesoporous γ-al2o3 nanostructured adsorbent
  • Preparation and application of hierarchical mesoporous γ-al2o3 nanostructured adsorbent

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preparation example Construction

[0029] Sorbent provided by the invention, its preparation method comprises the following steps:

[0030] 1. Dissolve one of aluminum sulfate, aluminum chloride, aluminum nitrate, aluminum ammonium sulfate and aluminum potassium sulfate or a mixture of any proportion in distilled water, then add thiourea, stir evenly to form Al 3+ The concentration is 0.01~0.5 mol / L, thiourea and Al 3+ The molar ratio is 1.0~25.0:1.0, then it is transferred to a hydrothermal kettle, and reacted at 130~200 °C for 2~24 h to obtain a hydrothermal product;

[0031] 2. After the hydrothermal product is cooled and filtered, it is first washed with distilled water until neutral, then the neutral filter cake is dispersed and washed with absolute ethanol and filtered, and the obtained filter cake is vacuum-dried at 60-100 °C for 4-16 h Finally, alumina precursor powder is obtained;

[0032] 3. The vacuum-dried product was calcined in a static air atmosphere at 450-700 °C for 2-6 h to prepare hierarchi...

Embodiment 1

[0037] Weigh a certain amount of aluminum chloride and thiourea respectively, mix and dissolve them in 70 mL distilled water, and stir evenly to form Al 3+ concentration of 0.1 mol / L, thiourea and Al 3+ The mixed solution with a molar ratio of 10.0:1.0 was then transferred to a hydrothermal kettle and reacted for 3 h under closed hydrothermal conditions at 180 °C. The hydrothermal product was sequentially cooled, filtered, dispersed and washed with a small amount of absolute ethanol, filtered, and then vacuum-dried at 80 °C for 12 h. The obtained sample was analyzed by XRD to be pure pseudo-boehmite phase. Then, the temperature was programmed to 550 °C at a heating rate of 1.5 °C / min, and roasted for 4 h under a static air atmosphere to obtain a product whose morphology and structure were stacked by irregular nano-sheets, see figure 1 , analyzed by XRD as pure γ-Al 2 o 3 Mutually. Its specific surface area and pore volume are 145.4 m 2 / g and 0.20 cm 3 / g, the pore diame...

Embodiment 2

[0041] Weigh a certain amount of aluminum nitrate, potassium aluminum sulfate, and thiourea respectively, mix and dissolve them in 70 ml distilled water, and stir evenly to form Al 3+ The concentration is 0.05 mol / L (among them, aluminum nitrate, aluminum potassium sulfate 3+ The contribution of concentration is 0.025 and 0.025 mol / L), thiourea and Al 3+ The mixed solution with a molar ratio of 4.0:1.0 was then transferred to a hydrothermal kettle and reacted for 3 h under closed hydrothermal conditions at 180 °C. The hydrothermal product was sequentially cooled, filtered, dispersed and washed with absolute ethanol, filtered, and then vacuum-dried at 60 °C for 16 h. The obtained sample was analyzed by XRD to be pure pseudo-boehmite phase. Then the temperature was programmed to 450 °C at a heating rate of 1.5 °C / min, and roasted for 6 h under a static air atmosphere to obtain spindle-shaped particles whose morphology was assembled from nano-sheets, see figure 2 , analyzed by...

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Abstract

The invention discloses a preparation method and application of a graded mesoporous γ-Al2O3 nanostructure adsorbent. The method is as follows: first, one of aluminum sulfate, aluminum chloride, aluminum nitrate, aluminum potassium sulfate and aluminum ammonium thiourea species, or a mixture thereof in any proportion is dissolved in distilled water, and then a certain amount of thiourea is added respectively, stirred evenly and then transferred to a hydrothermal kettle for hydrothermal treatment, and the product is naturally cooled, filtered, washed, vacuum-dried and roasted, A series of graded mesoporous γ-Al2O3 nanostructured adsorbent products in the form of microspheres, sheets, sea urchins and spindles were obtained. This method has the advantages of simple process, mild conditions, and various hierarchical nanostructures. The prepared hierarchical mesoporous alumina nanostructure material has excellent adsorption and purification effects on the refractory organic matter phenol in water, and has excellent adsorption and purification effects on the most important greenhouse gas CO2 Also has good adsorption capacity.

Description

technical field [0001] The invention relates to the technical field of chemical alumina production, specifically a graded mesoporous γ-Al 2 o 3 Preparation methods and applications of nanostructured adsorbents. Background technique [0002] Hierarchical nanostructured materials combine the excellent characteristics of hierarchical structure and mesoporous materials, so they have unique physical and chemical properties that are significantly different from powder materials. They are used in nanochemical reactors, catalysis, drug carriers, and low dielectric constant materials. It has potential and huge application value in many fields such as sound insulation materials and so on. Graded Mesoporous γ-Al 2 o 3 As an important metal oxide nanomaterial, its potential application value in the fields of adsorption, catalysis, separation and ceramics has attracted the attention of researchers. Graded γ-Al has been successfully prepared 2 o 3 Morphologies include nanotubes, na...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/08B01J20/30B01D15/00B01D53/04
Inventor 蔡卫权胡玉珍陈浩
Owner WUHAN UNIV OF TECH
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