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Preparation method of Gd-TiO2-SiO2-NiFe2O4 composite magnetic material

A technology of gd-tio2-sio2-nife2o4 and composite magnetic materials, which is applied in illumination water/sewage treatment, energy and wastewater treatment, etc., can solve the problems of poor stability and easy aggregation of suspended phase catalysts, and achieves overcoming poor stability and simple process. , Overcome the effect of easy aggregation

Inactive Publication Date: 2015-06-24
XI'AN PETROLEUM UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the above-mentioned defective of prior art, the object of the present invention is to provide a kind of Gd-TiO 2 -SiO 2 -NiFe 2 o 4 The preparation method of the composite magnetic material, immobilizing the gadolinium-doped titanium dioxide photocatalyst, can solve the difficult problem of separation and recovery of the catalyst, and can also overcome the poor stability and easy aggregation of the suspension phase catalyst; on the other hand, the gadolinium-doped titanium dioxide photocatalyst can improve TiO 2 photocatalytic activity, extending TiO 2 The spectral response range is favorable for TiO 2 Application and Promotion of Photocatalyst Industrialization

Method used

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  • Preparation method of Gd-TiO2-SiO2-NiFe2O4 composite magnetic material
  • Preparation method of Gd-TiO2-SiO2-NiFe2O4 composite magnetic material
  • Preparation method of Gd-TiO2-SiO2-NiFe2O4 composite magnetic material

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Embodiment 1

[0029] This embodiment includes the following steps:

[0030] (1) Gd-doped TiO 2 preparation of

[0031] Use 10mL n-tetrabutyl titanate as TiO 2 Use 10mL of absolute ethanol as a solvent to obtain the A solution after mixing thoroughly. At the same time, another 5 mL of 0.1 mol / L gadolinium nitrate aqueous solution was taken as solution B. The obtained B solution was added to the A solution, and concentrated hydrochloric acid was added to adjust the pH to 7, and a sol was obtained after stirring. The sol was dried at 80 °C and then calcined at 500 °C for 4 h to prepare Gd-doped TiO 2 .

[0032] (2)NiFe 2 o 4 Powder preparation

[0033]At a reaction temperature of 70°C, mix 10 mL of 0.15 mol / L nickel nitrate and 10 mL of 0.2 mol / L ferric nitrate, adjust the pH of the system to 12 with NaOH, filter the resulting precipitate, and wash it several times with distilled water to obtain a filter cake Dry at 90°C, and calcined at 600°C for 5 hours after fully grinding to obtai...

Embodiment 2

[0043] This embodiment includes the following steps:

[0044] (1) Gd-doped TiO 2 preparation of

[0045] Use 10mL n-tetrabutyl titanate as TiO 2 Use 10mL of absolute ethanol as a solvent to obtain the A solution after mixing thoroughly. At the same time, another 2 mL of 0.1 mol / L gadolinium nitrate aqueous solution was taken as solution B. Add the obtained B solution to A solution, add concentrated hydrochloric acid to adjust the pH to 6, and obtain a sol after stirring. The sol was dried at 80 °C and then calcined at 500 °C for 4 h to prepare Gd-doped TiO 2 .

[0046] (2)NiFe 2 o 4 Powder preparation

[0047] At a reaction temperature of 60°C, mix 10 mL of 0.15 mol / L nickel nitrate and 10 mL of 0.2 mol / L ferric nitrate, adjust the pH of the system to 11 with NaOH, filter the resulting precipitate, and wash it several times with distilled water to obtain a filter cake Dry at 90°C, and calcined at 600°C for 5 hours after fully grinding to obtain NiFe 2 o 4 Powder.

...

Embodiment 3

[0056] This embodiment includes the following steps:

[0057] (1) Gd-doped TiO 2 preparation of

[0058] Use 10mL n-tetrabutyl titanate as TiO 2 Use 10mL of absolute ethanol as a solvent to obtain the A solution after mixing thoroughly. At the same time, another 8 mL of 0.1 mol / L gadolinium nitrate aqueous solution was taken as solution B. The obtained B solution was added to the A solution, and concentrated hydrochloric acid was added to adjust the pH to 7, and a sol was obtained after stirring. The sol was dried at 80 °C and then calcined at 500 °C for 4 h to prepare Gd-doped TiO 2 .

[0059] (2)NiFe 2 o 4 Powder preparation

[0060]At a reaction temperature of 60°C, mix 20 mL of 0.15 mol / L nickel nitrate and 20 mL of 0.2 mol / L ferric nitrate, adjust the pH of the system to 12 with NaOH, filter the resulting precipitate, and wash it several times with distilled water to obtain a filter cake Dry at 90°C, and calcined at 600°C for 5 hours after fully grinding to obtai...

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Abstract

The invention relates to a preparation method of a Gd-TiO2-SiO2-NiFe2O4 composite magnetic material. The preparation method comprises the following steps: firstly preparing Gd-doped TiO2; then preparing NiFe2O4 powder; then preparing a SiO2 / NiFe2O4 composite material; finally weighing 1-2g of Gd-doped TiO2 powder, adding 1mL of absolute ethyl alcohol, preparing into slurry by using a glass rod, then adding 10ml of a prepared Gd-doped TiO2 sol, and uniformly stirring to obtain a powder-sol precursor solution; and then adding 2-3g of a magnetic matrix into the powder-sol precursor solution, drying at 50-70 DEG C, calcining for 1.5 hours at 480 DEG C, taking out and quenching, grinding and magnetically sorting to obtain the Gd-TiO2-SiO2-NiFe2O4 composite magnetic material catalyst. According to the invention, a gadolinium-doped titanium dioxide-doped photocatalyst is fixed and can improve the TiO2 photocatalytic activity and expand the spectral response range of TiO2, so that industrial application and popularization of the TiO2 photocatalyst are facilitated.

Description

technical field [0001] The invention relates to the technical field of preparation of magnetic photocatalyst materials, in particular to a Gd-TiO 2 -SiO 2 -NiFe 2 o 4 Preparation method of composite magnetic material. Background technique [0002] Photocatalysis is a potential water treatment technology. It has obvious advantages compared with traditional water treatment technologies, such as: strong processing capacity, mild reaction conditions and no secondary pollution. In recent years, titanium dioxide has been widely used in the field of photocatalysis, which has the characteristics of high efficiency, non-toxicity and stable performance, and shows good catalytic activity. TiO 2 The treatment of wastewater pollution by photocatalysts is a hot issue in the research of green environmental protection technology in recent years, but due to the 2 The forbidden band width is 3.2eV, which can only be excited by ultraviolet light with a wavelength of 387nm, while the ultr...

Claims

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Application Information

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IPC IPC(8): B01J23/83C02F1/30C02F1/32
CPCY02W10/37
Inventor 孟祖超王满学李谦定尹云超吴坤坤王博
Owner XI'AN PETROLEUM UNIVERSITY
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