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Preparation method of highly-effective Cr (VI) absorption carbon-aluminum oxide composite material

A composite material and alumina technology, applied in the field of carbon-alumina composite material preparation, can solve problems such as low adsorption and removal rate, and achieve the effects of simple preparation process, low equipment requirements, and good adsorption performance

Inactive Publication Date: 2017-09-08
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN101746793B reports a method for preparing hollow mesoporous alumina particles. The method is to prepare a positively charged boehmite sol under acidic conditions. At room temperature, the sol is coagulated and deposited under the action of a polymer electrolyte On the surface of the polymer electrolyte, hollow mesoporous alumina is obtained by final calcination. This synthesis step is relatively simple, and hollow mesoporous alumina is synthesized without using any colloidal particles as a core template.
CN102838162A discloses a method in which titanium dioxide precursor is dissolved in a certain proportion of water-organic solvent system, and after the mixture is subjected to solvothermal treatment, solid-liquid separation obtains porous titanium dioxide hollow spheres. This product can be used as an adsorption agent for heavy metal ions Cr(VI). agent, but the adsorption capacity is only 14mg / g
CN103551104A discloses a preparation method of a graded magnesium-aluminum hydrotalcite that adsorbs Cr(VI) and can be recycled. Its maximum adsorption capacity reaches 46.5 mg / g, but its adsorption and removal rate for Cr(VI) is low
For example, Chen et al. [H.Chen, J.X.Li, X.L.Wu, X.K.Wang. Synthesis of alumina-modified cigarette soot carbon as an adsorbent for efficient arsenate removal. Ind. Eng. Chem. Res., 2014, 53, 16051–16060] A carbon-alumina composite material with good adsorption performance on arsenic was successfully prepared by hydrothermal method. The soot is cheap and easy to obtain as a raw material, and it has a rich pore structure without heat treatment. Separation from water bodies, the use of adsorbents prepared from soot for water treatment may introduce other pollutants, such as carcinogens such as nicotine, nicotine, tar, cyanide, and radioactive substances
CN105107486A discloses a preparation method of a pseudo-boehmite composite film used for adsorption of toxic Cr (VI). The method is to precipitate an inorganic aluminum salt solution under alkaline conditions, add a film-forming agent and a structure regulator, and flow through Pseudo-boehmite composite film can be prepared after stretching and drying treatment. The film has a high removal rate for low-concentration Cr(VI) solution and is easy to separate from water, but the optimal adsorption capacity is only 17.8mg / g

Method used

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  • Preparation method of highly-effective Cr (VI) absorption carbon-aluminum oxide composite material
  • Preparation method of highly-effective Cr (VI) absorption carbon-aluminum oxide composite material
  • Preparation method of highly-effective Cr (VI) absorption carbon-aluminum oxide composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Slowly add 8.18g of aluminum isopropoxide into 72ml of deionized water, heat the oil bath to 90°C and hydrolyze for 1 hour, add 5ml of 2mol / L nitric acid solution dropwise and keep it at 90°C for condensing and refluxing for 12 hours, then cool to room temperature Pseudoboehmite sol was obtained; another 4g C 6 h 12 o 6 ·H 2Dissolve O in 40ml of deionized water, add 70mg of SDS and stir to form a mixed solution, mix the mixed solution with 10g of pseudo-boehmite sol, add 10ml of dehydrated ethanol with a mass fraction of 99.5%, ultrasonically for 10min, and mix well Place the suspension in a hydrothermal kettle, undergo hydrothermal reaction at 180°C for 12 hours, wash the obtained hydrothermal product alternately with water and absolute ethanol with a mass fraction of 99.5% for three times and centrifuge, and dry the centrifuged product at 80°C for 5 hours , dried product at 500°C, N 2 Roasting under the atmosphere for 4h, the obtained sample is a carbon-alumina co...

Embodiment 2

[0034] Slowly add 8.18g of aluminum isopropoxide into 72ml of deionized water, heat the oil bath to 90°C and hydrolyze for 1 hour, add 5ml of 2mol / L nitric acid solution dropwise and keep it at 90°C for condensing and refluxing for 12 hours, then cool to room temperature Pseudoboehmite sol was obtained; another 4g C 6 h 12 o 6 ·H 2 Dissolve O in 40ml of deionized water, add 70mg of SDS and stir to form a mixed solution, mix the mixed solution with 5g of pseudo-boehmite sol, add 10ml of absolute ethanol with a mass fraction of 99.5%, ultrasonicate for 10min, and mix well to suspend The solution was placed in a hydrothermal kettle, subjected to hydrothermal reaction at 170°C for 12 hours, the obtained hydrothermal product was alternately washed three times with water and absolute ethanol with a mass fraction of 99.5% and centrifuged, and the centrifuged product was generally dried at 90°C for 4 hours, Dry the product at 500°C, N 2 Calcined under atmosphere for 4h to obtain c...

Embodiment 3

[0037] Slowly add 8.18g of aluminum isopropoxide into 72ml of deionized water, heat the oil bath to 90°C and hydrolyze for 1 hour, add 5ml of 2mol / L nitric acid solution dropwise and keep it at 90°C for condensing and refluxing for 12 hours, then cool to room temperature Pseudoboehmite sol was obtained; another 4g C 6 h 12 o 6 ·H 2 Dissolve O in 40ml of deionized water, add 50mg of SDS and stir to form a mixed solution, mix the mixed solution with 10g of pseudoboehmite sol, add 5ml of dehydrated ethanol with a mass fraction of 99.5%, ultrasonicate for 10min, and mix the suspension Place in a hydrothermal kettle, undergo hydrothermal reaction at 160°C for 10 hours, wash the obtained hydrothermal product alternately with water and absolute ethanol with a mass fraction of 99.5% three times and centrifuge, dry the centrifuged product at 80°C for 5 hours, dry Product at 500°C, N 2 Calcined under atmosphere for 4h to obtain carbon-alumina composite material.

[0038] When absor...

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Abstract

The invention relates to a preparation method of a highly-effective Cr (VI) absorption carbon-aluminum oxide composite material. The preparation method of the highly-effective Cr (VI) absorption carbon-aluminum oxide composite material comprises hydrolyzing aluminum alkoxide under weakly acidic conditions to obtain pseudo-boehmite sol, uniformly mixing the pseudo-boehmite sol with a glucose solution with a certain amount of lauryl sodium sulfate dissolved in, adding in a certain amount of ethyl alcohol, and performing water boiling, separation, drying and baking to obtain the highly-effective Cr (VI) absorption carbon-aluminum oxide composite material. The highly-effective Cr (VI) absorption carbon-aluminum oxide composite material achieves a removal rate up to 98.2% for Cr (VI) solutions with the concentration lower than 80 mg / L. The prepared highly-effective Cr (VI) absorption carbon-aluminum oxide composite material greatly improves the absorbing capacity and the absorbing rate of toxic Cr (VI); when applied in a 100 mg / L mixed solution of Cr (VI), Cd (II), Cu (II), Zn (II) and Ni (II), the highly-effective Cr (VI) absorption carbon-aluminum oxide composite material also achieves excellent selective absorbability of Cr (VI) and reaches an absorbing capacity up to 76.5 mg / g, and for a single Cr (VI) solution with the same initial concentration, the highly-effective Cr (VI) absorption carbon-aluminum oxide composite material achieves an absorbing capacity of 78.58 mg / g.

Description

technical field [0001] The invention belongs to the technical field of the preparation of alumina and activated carbon composite materials and their application in the adsorption of heavy metal ions, and specifically relates to a method for preparing carbon-alumina composite materials for efficiently adsorbing toxic heavy metal ions Cr(VI) . Background technique [0002] Water pollution has become the most serious environmental problem today. Chromate ion contained in surface water is a common pollutant, which has great harm to human body, animals and plants, and has aroused widespread concern. Pollutants containing chromate ions come from a variety of industrial activities such as the paint industry, textile printing and dyeing, leather, metal processing, and electroplating. There are many treatment methods for heavy metal ions, such as chemical precipitation, ion exchange, electrolysis, adsorption, etc. Among them, the porous solid adsorption method has the advantages of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20C02F1/28C02F101/22
CPCB01J20/08B01J20/20C02F1/281C02F1/283C02F2101/22
Inventor 蔡卫权韩博文
Owner WUHAN UNIV OF TECH
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