Preparation method of sheet-shaped alpha-Fe2O3/ZnO composite photocatalyst

A technology of -fe2o3 and compound light, which is applied in the field of preparation of sheet-shaped α-Fe2O3/ZnO composite photocatalyst, can solve the problems of secondary preparation and high cost, and achieve the effect of improving utilization rate, mild reaction conditions and low energy consumption

Inactive Publication Date: 2015-12-30
HEBEI UNIV OF ENG
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Although supported α-Fe 2 o 3 / ZnO compared with ZnO / Fe obtained by mechanical mixing 2 o 3 The coupling body is more conducive to the development of ZnO-Fe 2 o 3 Synergistic effect among them, but there are problems of secondary preparation and high cost

Method used

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  • Preparation method of sheet-shaped alpha-Fe2O3/ZnO composite photocatalyst
  • Preparation method of sheet-shaped alpha-Fe2O3/ZnO composite photocatalyst
  • Preparation method of sheet-shaped alpha-Fe2O3/ZnO composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take 1mol·L -1 Put 2mL of ferric nitrate aqueous solution in a beaker, under magnetic stirring, first add 4mol·L -1 Sodium hydroxide aqueous solution 45mL, then add 1mol·L dropwise -1 Zinc nitrate aqueous solution 20mL (the molar ratio of ferric nitrate, sodium hydroxide and zinc nitrate is 1:90:10). After the dropwise addition was completed, stirring was continued for 1 h. The reaction precursor solution was transferred to a Erlenmeyer flask with a ground stopper, immersed in a water bath previously heated to 80° C., and aged for 5 h. Finally, after suction filtration, washing with distilled water for 2-3 times, and drying naturally, α-Fe 2 o 3 / ZnO composite catalyst.

Embodiment 2～6

[0034] Embodiment 2~6 and comparative example

[0035] Embodiments 2 to 6 and the comparative example have the same operating steps as in Example 1, the only difference being the type, concentration, ratio and aging temperature of the ferric salt, alkali and zinc salt used, as shown in Table 1. .

[0036] Table 1 Embodiment 2~6 and comparative example

[0037]

[0038] The aging temperature in Table 1 refers to the temperature of the water bath set when the reaction precursor solution is transferred to a conical flask with a ground stopper and immersed in a pre-heated water bath for aging. At a higher aging temperature, the reaction is relatively fast, so the required aging time is correspondingly shorter; at a lower aging temperature, the reaction is relatively slow, so the required aging time is correspondingly longer. When the aging temperature is limited to 80-99°C, the reaction is more thorough and takes a shorter time, and the purity of the prepared composite cataly...

experiment example 1

[0039] Experimental example 1: XRD characterization of photocatalyst

[0040] figure 1 For the pure ZnO photocatalyst prepared by comparative example and the α-Fe prepared by Examples 1~4 2 o 3 XRD characterization pattern of / ZnO composite photocatalyst. It can be seen that the diffraction peaks at 2θ=24.1°, 33.1°, 35.6°, 40.8°, 49.4°, 54.0°, and 63.9° belong to α-Fe 2 o 3 (JCPDSNo.33-0664), other diffraction peaks belong to ZnO (JCPDSNo.36-1451). With the increase of the amount of ferric salt used, the α-Fe in the product 2 o 3 The intensity of the characteristic diffraction peaks increases gradually. No other impurity peaks were found, indicating that the product was of high purity.

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Abstract

The invention relates to a preparation method of a sheet-shaped alpha-Fe2O3 / ZnO composite photocatalyst. The preparation method comprises the following steps: step 1: preparing a reaction precursor liquid: under a stirring condition, dripping an alkali solution into a trivalent iron salt liquid; then dripping an zinc salt solution; after dripping, continually stirring until a mixed solution is at a muddy state containing red brown substances, wherein the mol ratio of a trivalent iron salt to an alkali to a zinc salt is (1-10) to 90 to 10; step 2: ageing: immersing a glass container filled with the reaction precursorliquid into a water-bath pot at 80-99 DEG C and ageing until sediment covers the bottom of the container and a reaction solution is clear; and filtering, washing and naturally airing to obtain the alpha-Fe2O3 / ZnO composite photocatalyst. The alpha-Fe2O3 / ZnO composite photocatalyst powder is prepared by adopting a low-temperature ageing method; and reaction raw materials are easy to obtain, operation steps are simple, reaction conditions are moderate and energy consumption is small, so that the preparation method can be easily popularized in industrialized mass production.

Description

technical field [0001] The invention relates to a flake α-Fe 2 o 3 The invention discloses a method for preparing a ZnO / ZnO composite photocatalyst, belonging to the field of photocatalyst preparation. Background technique [0002] Semiconductor heterogeneous photocatalytic degradation technology is an emerging technology for purification of environmental pollutants. Among the currently used photocatalytic materials, although TiO 2 Due to the advantages of strong redox ability, stable properties, non-toxic and harmless, etc., it has always been at the core of research, but it still has problems such as easy recombination of photogenerated electrons and holes, low quantum efficiency, and inability to fully utilize visible light. [0003] ZnO possesses the same 2 Similar to the forbidden band width and valence band energy level position, and the photocatalytic degradation mechanism of the two is exactly the same, so ZnO is also an excellent photocatalytic material in essen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80
Inventor 谢娟李美霞郝勇静刘志勇高鹏鹏
Owner HEBEI UNIV OF ENG
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