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Magnetic photocatalyst and its preparing method

A photocatalyst and magnetic technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, and magnetism of inorganic materials, etc., can solve the problems of complex preparation process and long cycle, and achieve simple preparation process, short cycle, and lower forbidden band The effect of width

Inactive Publication Date: 2007-03-28
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the magnetic composite materials they prepared did not respond in the visible light region, and the preparation process was complicated and the cycle was long

Method used

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  • Magnetic photocatalyst and its preparing method
  • Magnetic photocatalyst and its preparing method

Examples

Experimental program
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Effect test

Embodiment 1

[0019] (1)NiFe 2 o 4 Hydrothermal Synthesis of Nanoparticles

[0020] NiSO 4 ·6H 2 O, Fe 2 (SO 4 ) 3 ·XH 2 O and KOH by n(Ni 2+ ):n(Fe 3+ ):n(OH - )=1:2~2.5:8~8.5 was dissolved in distilled water, and the solution was placed on the electric stove and continued to boil for 1~1.5h. After standing still and cooling, filter with suction and wash with distilled water for 2 to 3 times to obtain the hydrothermal reaction precursor.

[0021] Add the hydrothermal reaction precursor to distilled water so that the nickel concentration is 1.0-2.5mol / L, then add acetic acid to make the concentration 1.0-2.0mol / L, adjust the pH value to 10.0-13.0 with lye, and stir well Move it into a high-pressure reactor with a filling degree of 60-90%, react hydrothermally at 100-250°C for 3-8 hours, suction filter after cooling, wash with distilled water for 2-3 times, and vacuum the obtained filter residue at 70-100°C Dry for 3-5 hours and grind to get NiFe 2 o 4 nanoparticles.

[0022] ...

Embodiment 2

[0031] (1)NiFe 2 o 4 Hydrothermal Synthesis of Nanoparticles

[0032] NiCl 2 , FeCl 3 and NaOH by n(Ni 2+ ):n(Fe 3+ ):n(OH - )=1: 2.5~3:8.5~9 were dissolved in distilled water, and the solution was placed on the electric stove and continued to boil for 1~1.5h. After standing still and cooling, filter with suction and wash with distilled water for 2 to 3 times to obtain the hydrothermal reaction precursor.

[0033] Add the hydrothermal reaction precursor to distilled water so that the nickel concentration is 0.45-1.5mol / L, then add sodium acetate to make the concentration 0.3-1.0mol / L, adjust the pH value to 8.0-10.5 with lye, and stir well Then move it into a high-pressure reactor with a filling degree of 75-90%. Under the condition of 150-250°C, hydrothermally react for 0.5-3.5h. After cooling, filter it with suction and wash it with distilled water for 2-3 times. Dry under vacuum for 3-5 hours, and grind to get NiFe 2 o 4 nanoparticles.

[0034] The NiFe 2 o 4 M...

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Abstract

The present invention relates to a composite photocatalyst which can utilize sunlight and has good magnetic separating property and its preparation method. Said preparation method includes the following several steps: firstly, utilizing hydrothermal method to synthesize NiFeO4 nano granules, then utilizing homogeneous precipitation method to directly cover NiFeO4 magnetic nuclear surface by using TiO2 so as to form TiO2 external shell. Said composite photocatalyst can be used for making water supply treatment and waste water treatment.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanometer photocatalysts. In particular, it relates to a composite photocatalyst that can utilize sunlight and can be magnetically separated and a preparation method thereof. Background technique [0002] Photocatalytic technology has great application potential in degrading organic pollutants in water or air, and has obvious advantages over electrocatalysis and wet catalytic oxidation in the mineralization and decomposition of refractory toxic organic substances. However, photocatalytic technology has not yet been industrialized in water supply and wastewater treatment, and the main problems in engineering applications are the inability to use sunlight and the inability to separate and recycle the photocatalyst powder in the suspension system. Immobilizing photocatalysts on glass, ceramics and other materials can solve the problem of photocatalyst separation and recovery, but this greatly...

Claims

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Application Information

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IPC IPC(8): B01J21/06H01F1/11
Inventor 刘红刘潘张惠灵任大军孙旋
Owner WUHAN UNIV OF SCI & TECH
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