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Method for preparing ZnO and CdO heterogeneous nanostructured oxide material

A nanostructure and oxide technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc., can solve the problems of inability to form composites, and the catalytic activity is not improved. To achieve the effect of improving photocatalytic activity and simple method

Inactive Publication Date: 2009-08-12
JILIN UNIV
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Problems solved by technology

The catalytic activity of CdS-CdO is lower than that of CdS, indicating that the binary composite system CdS and CdO prepared by ordinary co-precipitation cannot form an effective composite, and the catalytic activity has not been improved (International Journal of HydrogenEnergy, 2008, 33, 4265-4273
The synthesis and photocatalytic properties of oxides with ZnO / CdO heterogeneous nanostructures have not been reported in the literature so far.

Method used

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  • Method for preparing ZnO and CdO heterogeneous nanostructured oxide material
  • Method for preparing ZnO and CdO heterogeneous nanostructured oxide material
  • Method for preparing ZnO and CdO heterogeneous nanostructured oxide material

Examples

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Embodiment 1

[0025] Example 1: Preparation and Characterization of ZnO / CdO with Heterogeneous Nanostructure

[0026] Weigh 2.616g Zn powder, add dilute sulfuric acid solution 400cm 3 , heated in a water bath to keep the reaction temperature at 60-65°C until no more hydrogen is produced, and Zn and ZnSO are obtained 4 solution. Discard the supernatant, add Cd(NO 3 ) 2 Solution 200cm3 , slowly dripping Na under stirring 2 CO 3 Solution 250cm 3 , The dropping speed is 2-3 drops / second. After the reaction is completed, filter with suction, wash the precipitate with water and ethanol, and dry at 60°C for 8-12 hours to obtain a uniform mixture of Zn-CdCO3. Then put it in a muffle furnace to program the temperature (5-10° C. / min) to 600° C., and keep it warm for 1.5 hours to prepare an oxide with a particle size of 60-80 nm and a ZnO / CdO heterogeneous nanostructure.

[0027] XRD analysis of the product obtained shows that the product is composed of ZnO and CdO phases, see Figure 5 . Th...

Embodiment 2

[0028] Example 2: Preparation and Characterization of ZnO / CdO with Heterogeneous Nanostructure

[0029] Raw material and its consumption, preparation process are the same as embodiment 1, just heat treatment process is: the Zn-CdCO 3 The homogeneous mixture is placed in a muffle furnace and the temperature is programmed to rise (5-10°C / min) to 700°C, and then kept for 3 hours to prepare an oxide with a particle size of 300-400nm and a heterogeneous nanostructure of ZnO / CdO.

[0030] image 3 TEM picture of ZnO / CdO prepared by heat treatment at 700℃ for 3h, Figure 4 for correspondence image 3 The EDS spectrum. EDS was used to analyze the composition of the micro-regions at the junction of the particles (the atomic percentages were O: 22.40%, Cd: 51.60%, and Zn: 26.00%, respectively), indicating that the product was a ZnO / CdO heterostructure.

Embodiment 3

[0031] Example 3: Preparation of ZnO / CdO with heterogeneous nanostructure

[0032] Preparation process is the same as embodiment 1 or embodiment 2, just the Na in embodiment 1 or 2 2 CO 3 The solution is changed to add dilute ammonia solution to obtain Zn-Cd(OH) 2 Homogeneous mixture; the same product as in Example 1 or 2 can be prepared through heat treatment, and XRD analysis shows that the product is also composed of ZnO and CdO phases.

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Abstract

The invention relates to a method for preparing a ZnO and CdO heterogeneous nano structural oxide material, and belongs to the technical field of inorganic material preparation. Dilute sulphuric acid and metal zinc powder are reacted to form loose and porous spongy metal zinc, then CdCO3 or Cd(OH)2 is evenly precipitated on the surface of the loose and porous spongy metal zinc, finally the metal zinc is oxidized to form ZnO, and the CdCO3 or the Cd(OH)2 is decomposed into CdO so as to form a ZnO / CdO heterogeneous nano structural oxide. The method is simple and convenient, and does not need a template agent; the size of oxide particles can be controlled by thermal treatment temperature or time; and the photocatalysis activity of a product is remarkably improved compared with the ZnO-CdO prepared by the prior coprecipitation method.

Description

technical field [0001] The invention belongs to the technical field of inorganic material preparation technology, and relates to a preparation method of an oxide material with a ZnO / CdO heterogeneous nanostructure that can be used in the field of photocatalysis. Background technique [0002] Nanophotocatalytic materials have broad application prospects in the fields of solving environmental pollution, photo-splitting water to produce hydrogen and so on. However, currently used photocatalysts such as TiO 2 , ZnO, etc. have the disadvantages of low catalytic efficiency and low utilization rate of sunlight. By synthesizing composite oxide photocatalytic materials, there will be great improvements in prolonging the lifetime of photogenerated electrons and holes and improving the absorption and utilization of visible light by catalysts. As reported by Y. Bessekhouad et al. 2 S 3 / TiO 2 and CdS / TiO 2 Research on the preparation of composite oxide photocatalysts and the degra...

Claims

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Application Information

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IPC IPC(8): B01J23/06B01J37/02B01J37/12H01L31/0336
Inventor 庞广生孙尚梅冯守华
Owner JILIN UNIV
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