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Alumina/calcium silicate graded composite film and preparation method and application thereof

A technology of composite film and calcium silicate, which is applied in chemical instruments and methods, alkali metal oxides/hydroxides, silicon compounds, etc., can solve the problems of poor binding ability between surface hydroxyl groups and metal cations, and achieve excellent cycle performance, The effect of saving separation cost and high removal rate

Inactive Publication Date: 2019-08-06
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Indeed, γ-Al 2 o 3 As a material with good acid and alkali resistance, large specific surface area, and rich hydroxyl groups on the surface, it has been used in the field of adsorption, but its surface hydroxyl group has extremely poor binding ability to metal cations, so it has been used to adsorb anionic pollutants.

Method used

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  • Alumina/calcium silicate graded composite film and preparation method and application thereof
  • Alumina/calcium silicate graded composite film and preparation method and application thereof
  • Alumina/calcium silicate graded composite film and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] 2.4g HMT and 0.18g CaCl were mixed at room temperature 2 Disperse in 50mL deionized water, the solution is clear and transparent, pour it into a 100mL hydrothermal kettle, place a piece of γ-Al 2 o 3 After the film was heated in water at 140°C for 6 hours, the film was taken out after the water heating was completed, the surface of the film was washed repeatedly with ethanol and water and then dried in an oven at 50°C for 1 hour. Place the dried film in a 100mL hydrothermal kettle, then add 50mL containing 0.05g Na 2 SiO 3 9H 2 O aqueous solution and heated in water at 160°C for 12h, took out the film, rinsed the film surface repeatedly with ethanol and water, and dried it in an oven at 50°C for 1h to obtain γ-Al 2 o 3 @CS composite film.

[0044] XRD test and corresponding data processing and result analysis show that γ-Al appears in both 2θ=46° and 66° 2 o 3 The characteristic diffraction peaks of γ-Al 2 o 3 @CS CaSiO also appeared at 2θ=28° and 39° 3 chara...

Embodiment 2

[0047] 4g HMT and 0.3g CaCl at room temperature 2 Disperse in 50mL deionized water, the solution is clear and transparent, pour it into a 100mL hydrothermal kettle, place a piece of γ-Al 2 o 3 After the film was heated in water at 160°C for 6 hours, the film was taken out after the water heating was completed, the surface of the film was washed repeatedly with ethanol and water and then dried in an oven at 50°C for 1 hour. Place the dried film in a 100mL hydrothermal kettle, then add 50mL containing 0.08g Na 2 SiO 3 9H 2 O aqueous solution and heated in water at 140°C for 12h, took out the film, rinsed the film surface repeatedly with ethanol and water, and dried it in an oven at 50°C for 1h to obtain γ-Al 2 o 3 @CS composite film.

[0048] When adsorbing 50ml, 80mg / L of Pb(II) solution, adjust the pH to 6 with a sodium hydroxide solution with a concentration of 0.1mol / L, and then add 0.1g of γ-Al 2 o 3 @CS thin film sample, set the parameters of the constant temperatu...

Embodiment 3

[0050] 3g HMT and 0.15g CaCl at room temperature 2 Disperse in 50mL deionized water, the solution is clear and transparent, pour it into a 100mL hydrothermal kettle, place a piece of γ-Al 2 o 3 After the film was heated in water at 150°C for 6 hours, the film was taken out after the water heating was completed, the surface of the film was washed repeatedly with ethanol and water and then dried in an oven at 50°C for 1 hour. Place the dried film in a 100mL hydrothermal kettle, then add 50mL containing 0.07g Na 2 SiO 3 9H 2 O aqueous solution was heated at 150°C for 12 hours, the film was taken out, rinsed with ethanol and water repeatedly, and then dried in an oven at 50°C for 1 hour to obtain γ-Al 2 o 3 @CS composite film.

[0051] When adsorbing 50ml, 80mg / L of Pb(II) solution, adjust the pH to 6 with a sodium hydroxide solution with a concentration of 0.1mol / L, and then add 0.1g of γ-Al 2 o 3 @CS thin film sample, set the parameters of the constant temperature oscill...

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Abstract

The invention discloses an alumina / calcium silicate graded composite film and a preparation method and application thereof. The method comprises the following steps: dispersing HMT and CaCl2 in waterat room temperature, pouring the solution into a hydrothermal kettle after the solution is clear and transparent, placing a gamma-Al2O3 film, carrying out hydrothermal reaction, taking out the film after the hydrothermal reaction is completed, cleaning the surface of the film and then drying the film; placing the dried film in the hydrothermal kettle, then adding Na2SiO3.9H2O to carry out hydrothermal reaction, taking out the film, cleaning the surface of the film and then drying the film to obtain the gamma-Al2O3@CS composite film. The prepared film has higher adsorption capacity and extremely high removal rate for Pb (II), and the removal rate for the Pb (II) with an initial concentration of 80 mg / L reaches 99.99%, and can meet the national discharge standard for wastewater containing the Pb (II), and the alumina / calcium silicate graded composite film is easy to separate from water after adsorption is completed, and greatly saves separation cost.

Description

technical field [0001] The invention belongs to the field of aluminum oxide / calcium silicate composite materials, and in particular relates to a graded aluminum oxide / calcium silicate composite film and its preparation method and application. Background technique [0002] So far, a large amount of industrial wastewater containing excessive heavy metal ions has been discharged into the environment, seriously threatening the sustainable development of the ecosystem and causing great harm to human health. For example, Pb(II) and Cu(II) are typical heavy metal ions. Lead poisoning can lead to anemia in humans, and can also affect the nervous system and digestive system. China's drinking water hygiene standard (GB5749-2006) stipulates that the upper limit of Pb(II) in water is 0.01mg / L, and Cu(II) is 1.0mg / L. Therefore, it is imperative to explore new technologies and new materials to completely remove excess heavy metal ions in water and make it meet drinking water standards. ...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/08B01J20/10B01J20/28033B01J2220/42B01J2220/4806C02F1/281C02F1/288C02F2101/20
Inventor 蔡卫权涂文骏
Owner GUANGZHOU UNIVERSITY
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