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Cobalt tungstate material synthesized under assistance of sodium citrate, and preparation method and application thereof

A technology of sodium citrate and cobalt tungstate, applied in chemical instruments and methods, cobalt compounds, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problem of slowing down the nucleation rate of precursors and crystal growth, affecting the final product morphology and other issues to achieve the effect of improving the sonocatalytic activity

Active Publication Date: 2021-12-31
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, during the hydrothermal process, the drop of free metal ions slows down the nucleation rate and crystal growth of the precursor, thereby affecting the morphology of the final product.

Method used

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  • Cobalt tungstate material synthesized under assistance of sodium citrate, and preparation method and application thereof
  • Cobalt tungstate material synthesized under assistance of sodium citrate, and preparation method and application thereof
  • Cobalt tungstate material synthesized under assistance of sodium citrate, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1CoWO 4 preparation of

[0019] First, Co(NO 3 ) 2 ·6H 2 O (5mmol) was dissolved in 30mL deionized water to obtain an aqueous solution labeled A, and Na 2 WO 4 2H 2 O (5mmol) was dissolved in 30mL deionized water, marked as solution B; A and B were mixed, stirred magnetically at room temperature for 0.5h; then ultrasonically reacted for 0.5h and then the homogeneous suspension was sealed in a 100ml Teflon-lined container In an autoclave, keep at 180°C for 24h, then cool down to room temperature naturally. Suction filtration and washing several times, the precipitate was collected by centrifugation, and finally vacuum-dried at 60°C for 2h. The product CoWO 4 , denoted as CoWO 4 -0.

Embodiment 2

[0020] The preparation of the cobalt tungstate assisted synthesis of embodiment 2 sodium citrate

[0021] First, Co(NO 3 ) 2 ·6H 2 O (5mmol) was dissolved in 30mL deionized water to obtain an aqueous solution labeled A, and Na 2 WO 4 2H 2 O (5mmol) was dissolved in 30mL of deionized water, marked as B solution; A and B were mixed, and different masses of sodium citrate (0.1474g, 0.3676g, 0.7353g, 1.475g) were added thereto, and magnetically stirred at room temperature for 0.5 h; ultrasonically reacted for 0.5 h, then sealed the homogeneous suspension in a 100 ml polytetrafluoroethylene-lined autoclave, kept at 180° C. for 24 h, and then cooled naturally to room temperature. Suction filtration and washing several times, centrifugation to collect the precipitate, and finally vacuum drying at 60°C for 2 hours to obtain the product CoWO 4 , denoted as CoWO 4 -1, CoWO 4 -2, CoWO 4 -3, CoWO 4 -4.

Embodiment 3

[0022] The characterization analysis of the cobalt tungstate acoustic catalyst of embodiment 3 sodium citrate auxiliary synthesis

[0023] figure 1 Synthetic CoWO 4 and CoWO synthesized assisted by sodium citrate 4 XRD spectrum of -2 sample. The diffraction peaks in the figure are strong and sharp, indicating that the synthesized product has high crystallinity.

[0024] figure 2 Synthetic CoWO 4 and CoWO synthesized assisted by sodium citrate 4 XPS spectrum of -2 samples. The high-resolution spectral signals of W4f, Co2p, and O1s appear at 50.3eV, 812.3eV, and 545.3eV, respectively, proving that the valences of W, Co, and O in the compound are +6, +2, and -2, respectively. Among them, the high-resolution spectral signals of each element in the cobalt tungstate nanomaterial synthesized by adding sodium citrate are also very close to the description in the literature, indicating that the product synthesized by adding sodium citrate is still CoWO 4 nanomaterials.

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Abstract

The invention belongs to the technical field of water pollution protection, and particularly relates to a cobalt tungstate material synthesized under assistance of sodium citrate, and a preparation method and application thereof. The preparation method comprises the following steps: respectively dissolving Co (NO3) 2.6 H2O and Na2WO4. 2H2O in deionized water; mixing the two solutions, adding sodium citrate, and magnetically stirring at room temperature; then carrying out ultrasonic reaction, pouring into a reaction kettle, and carrying out high-temperature reaction; and cooling to room temperature, carrying out suction filtration to collect a product, and drying to obtain the product. The performance of the cobalt tungstate material for acoustically catalyzing and degrading pollutants is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of water body pollution protection, and in particular relates to a sodium citrate-assisted cobalt tungstate synthesis material and a preparation method and application thereof. Background technique [0002] The morphology of materials is closely related to their synthesis methods. Hydrothermal method is widely used in the synthesis of cobalt tungstate nanomaterials. So far, hydrothermally synthesized cobalt tungstate has different micro / nanostructures, including nanorods, microspheres, and sea urchin-like morphology. Sodium citrate is an important additive in the hydrothermal process, and its carboxylic acid group and hydroxyl group can strongly chelate metal ions. Therefore, during the hydrothermal process, the drop of free metal ions slows down the nucleation rate and crystal growth of the precursors, thereby affecting the morphology of the final product. [0003] The morphology, facet exposure, and siz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00B01J31/34
CPCC01G51/00B01J31/34C01P2002/72C01P2002/85Y02W10/37
Inventor 王思幻徐亮刘妮萍张琳吴学签王新
Owner LIAONING UNIVERSITY
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