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Tripotassium pentavanadate photocatalyst and bismuth vanadate/tripotassium pentavanadate composite photocatalyst, preparation method and application thereof

A technology of photocatalyst and tripotassium vanadate, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. Easy to compound solar energy utilization rate and other issues, to achieve the effect of mild and non-toxic conditions, high yield and high purity

Inactive Publication Date: 2019-10-01
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that oxo-salt semiconductor photocatalytic materials overcome the traditional TiO 2 The disadvantages of photocatalytic materials such as large bandgap width, easy electron-hole recombination and low solar energy utilization

Method used

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  • Tripotassium pentavanadate photocatalyst and bismuth vanadate/tripotassium pentavanadate composite photocatalyst, preparation method and application thereof
  • Tripotassium pentavanadate photocatalyst and bismuth vanadate/tripotassium pentavanadate composite photocatalyst, preparation method and application thereof
  • Tripotassium pentavanadate photocatalyst and bismuth vanadate/tripotassium pentavanadate composite photocatalyst, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: Pure Phase BiVO 4 preparation of

[0041] Weigh 2.5mmol of Bi(NO 3 ) 3 ·5H 2 O and 2.5 mmol of NH 4 VO 3 , were dissolved in 7mL of distilled water and magnetically stirred for 30min, NH 4 VO 3 The suspension was added dropwise with Bi(NO 3 ) 3 ·5H 2 In O, the pH was adjusted to 9 with NaOH, and magnetic stirring was continued for 30 min. Transfer the mixed suspension to the liner of the hydrothermal kettle, add an appropriate amount of distilled water to a filling degree of 80%, heat at 160°C for 12 hours, wash the yellow solid generated by the reaction with distilled water and ethanol several times to neutrality, and Oven drying at 60°C for 6h to obtain pure phase BiVO 4 Photocatalyst, its X-ray powder diffraction pattern (XRD) see figure 1 . The pure phase BiVO prepared in this example 4 Scanning Electron Micrograph (SEM) of the sample see figure 2 . Take BiVO 4 The dosage of the sample is 0.25g / L, and the initial concentration of the met...

Embodiment 2

[0042] Example 2: Pure Phase K 3 V 5 o 14 preparation of

[0043] According to chemical formula K 3 V 5 o 14 The stoichiometric ratio of element K and element V in the medium, the raw materials of a certain molar ratio are weighed respectively, the source of K is one or a mixture of potassium carbonate and potassium nitrate, the source of V is vanadium pentoxide and ammonium metavanadate one or a mixture of both. Grind and mix the two reactants evenly, and press into tablets with a powder tablet machine to obtain a tablet mixture. The above flake mixture was calcined under air atmosphere, the calcining temperature was 500°C, the calcining time was 12h, and after natural cooling, it was fully ground to obtain the pure phase K 3 V 5 o 14 Photocatalyst, its X-ray powder diffraction pattern (XRD) see image 3 . The pure phase K prepared in this embodiment 3 V 5 o 14 The scanning electron micrograph (SEM) and the transmission electron micrograph (TEM) of the sample ca...

Embodiment 3

[0045] Example 3: Pure Phase K 3 V 5 o 14 preparation of

[0046] According to chemical formula K 3 V 5 o 14 The stoichiometric ratio of element K and element V in the medium, the raw materials of a certain molar ratio are weighed respectively, the source of K is one or a mixture of potassium carbonate and potassium nitrate, the source of V is vanadium pentoxide and ammonium metavanadate one or a mixture of both. Grind and mix the two reactants evenly, and press into tablets with a powder tablet machine to obtain a tablet mixture. The above flake mixture was calcined under air atmosphere, the calcining temperature was 500°C, the calcining time was 24h, and after natural cooling, it was fully ground to obtain the pure phase K 3 V 5 o 14 catalyst of light. The photocatalytic results showed that, Image 6 It can be seen that the removal rate of methylene blue can reach 88.47% at 75min.

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Abstract

The present invention provides K 3 V 5 O 14 Photocatalysts and BiVO 4 / K 3 V 5 O 14 Composite photocatalyst and preparation method and application thereof. K 3 V 5 O 14 The preparation method of the photocatalyst is: grind the K source and the V source into tablets to obtain a flake mixture; calcine the flake mixture in an air atmosphere, cool it naturally and then grind it fully to obtain K 3 V 5 O 14 catalyst of light. BiVO 4 / K 3 V 5 O 14 The composite photocatalyst is made by adding K 3 V 5 O 14 With BiVO 4 After mixing, it is calcined in an air atmosphere and then naturally cooled. This invention for the first time combines K 3 V 5 O 14 Used in photocatalytic tests, the photocatalytic activity is better under visible light. At the same time, BiVO was prepared for the first time 4 / K 3 V 5 O 14 Photocatalytic composite materials have mild preparation conditions, are suitable for mass production, and have high photocatalytic activity under visible light.

Description

technical field [0001] The present invention relates to inorganic photocatalytic materials, especially to K 3 V 5 o 14 Photocatalyst and BiVO 4 / K 3 V 5 o 14 Composite photocatalyst and its preparation method and application. Background technique [0002] Semiconductor photocatalytic technology has the advantages of deep reaction at room temperature, can use solar energy to drive the reaction, and has no secondary pollution. It has been applied in the remediation of water pollution. In recent years, oxo acid salts with semiconductor properties have attracted extensive attention from researchers due to their ability to absorb visible light in sunlight, high photocatalytic activity, and environmental friendliness. Studies have shown that oxo-salt semiconductor photocatalytic materials overcome the traditional TiO 2 Such photocatalytic materials have disadvantages such as large band gap width, easy electron-hole recombination, and low solar energy utilization rate. Amo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/22C02F1/30C02F101/36C02F101/38
CPCC02F1/30B01J23/002B01J23/22C02F2305/10C02F2101/38C02F2101/36B01J2523/00B01J35/39B01J2523/13B01J2523/54B01J2523/55
Inventor 李艳军李雅明李轩科张江丛野董志军崔正威袁观明
Owner WUHAN UNIV OF SCI & TECH
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