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Efficient photocatalyst for bismuth vanadate nanorod and preparation method of catalyst

A photocatalyst and nanorod technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of high cost, achieve low equipment requirements, and reduce defects The effect of density, clear cost advantages and price/performance

Inactive Publication Date: 2014-09-03
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, people have improved the photocatalytic activity of bismuth vanadate to a certain extent by preparing composite structures, doping, loading and other technical means, but this method is costly; another way to improve its photocatalytic activity is to control the photocatalytic activity of vanadate. The morphology of bismuth crystals is generally achieved by adding various chelating agents or surfactants, and has achieved obvious results, spherical, dumbbell-shaped nanoparticles, regular octahedral, truncated octahedral nanocrystals, quantum Tubes, nanosheets, etc. have been reported

Method used

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  • Efficient photocatalyst for bismuth vanadate nanorod and preparation method of catalyst
  • Efficient photocatalyst for bismuth vanadate nanorod and preparation method of catalyst
  • Efficient photocatalyst for bismuth vanadate nanorod and preparation method of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1: Dissolve 0.4mmol of bismuth nitrate pentahydrate in 20ml of deionized water, use the PTFE lining of the hydrothermal kettle as the container, stir for 30 minutes to form a uniform milky white cloudy liquid, then add 1.2mmol of sodium oleate, and stir for 60 minutes In order to obtain a stable milky white suspension, it is recorded as solution A;

[0031] Step 2: Take 0.4 mmol of ammonium metavanadate and dissolve it in 20 ml of deionized water, stir until it dissolves to form a light yellow transparent solution, which is recorded as solution B;

[0032] Step 3: Add solution B to solution A in the PTFE lining while stirring, and continue stirring for 2 hours to obtain a uniform light milky yellow mixture C;

[0033] Step 4: Transfer the uniformly mixed turbid liquid C to a high-temperature and high-pressure reactor, add a stirring magnet, react at 100°C for 24 hours, and naturally cool to room temperature;

[0034] Step 5: The obtained product was washed with de...

Embodiment 2

[0042] The preparation method in this embodiment is the same as that in Example 1, the difference is only that the conditions in the preparation process are different, in the step one and step two of the present embodiment, the amount of the substance of bismuth nitrate, ammonium metavanadate and sodium oleate and the implementation Compared with example 1, all were doubled, and the rest of the conditions were unchanged.

[0043] The bismuth vanadate photocatalyst prepared in Example 2 was characterized by transmission electron microscope, X-ray diffraction and other means. Transmission electron microscopy results show that the bismuth vanadate photocatalyst obtained in Example 2 is in the shape of nanorods, with good monodispersity, a diameter of about 25 nm, an aspect ratio of 10-35, and extending along the [010] direction. X-ray diffraction results show that the obtained bismuth vanadate nanorods are monoclinic scheelite phase.

Embodiment 3

[0045] The preparation method in this example is the same as that in Example 1, the only difference is that the conditions in the preparation process are different. The hydrothermal reaction time of Step 4 of this example is 48 hours, no magnetron is added, and the other conditions remain unchanged.

[0046] The bismuth vanadate photocatalyst prepared in Example 3 was characterized by transmission electron microscope, X-ray diffraction and other means. Transmission electron microscopy results show that the bismuth vanadate photocatalyst obtained in Example 3 is in the shape of nanorods, with good monodispersity, a diameter of about 20 nm, an aspect ratio of 10-40, and extending along the [010] direction. X-ray diffraction results show that the obtained bismuth vanadate nanorods are monoclinic scheelite phase.

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Abstract

The invention relates to an efficient photocatalyst for a bismuth vanadate nanorod and a preparation method of the catalyst. The morphology of the catalyst is rodlike, the size is nano-scale, the diameter of the nanorod is 15-30nm, the draw ratio is 5-40, the specific surface area is 28.2m<2>.g<-1>, the crystal phase is a monoclinic scheelite phase, and the growth direction is [010] direction. The preparation method comprises the following steps: firstly, dissolving bismuth nitrate pentahydrate, and sodium oleate or oleic acid into water, acutely stirring, and then adding ammonium metavanadate to a mixed solution; carrying out water heating for 6-48 hours under the condition at 70-200 DEG C, and centrifugally washing and drying to obtain the bismuth vanadate nanorod. Compared with the prior art, the synthesis method adopted by the invention is simple in equipment, convenient to operate, short in synthesis cycle, high in repeatability, few in raw material species, low in cost, environmental friendly, free of pollution and high in yield, the prepared bismuth vanadate nanorod is high in adsorption capacity, and the toxic pollutants and decomposition water can be abnormally efficiently degraded under radiation of an ultraviolet light, a visible light and a natural light.

Description

technical field [0001] The invention relates to a photocatalyst, in particular to a bismuth vanadate nanorod high-efficiency photocatalyst and a preparation method thereof. Background technique [0002] Environmental degradation and energy crisis are currently two prominent social problems that restrict the sustainable development of human beings and affect the quality of human life. As an inexhaustible clean energy, solar energy has been greatly valued by human beings. The popularization of solar power generation technology not only effectively alleviates the problem of energy shortage, but also alleviates the environmental pressure from the side to a certain extent; similarly, The use of solar energy to directly control certain environmental pollution problems has also attracted more and more attention, and various technical means have been developed. [0003] One of the main pollutants in environmental pollution is toxic organic substances in water and air, especially in...

Claims

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Application Information

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IPC IPC(8): B01J23/22
Inventor 郭益平张洋洋段华南李华刘河洲
Owner SHANGHAI JIAO TONG UNIV
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