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Bismuth tungstate nanometer photocatalyst and method for preparing same

A nano-photocatalyst, bismuth tungstate technology, applied in the field of photocatalysis, can solve the problems of limited production efficiency, time-consuming, cumbersome steps, etc., and achieve the effects of short time-consuming, shortened reaction time, and simple preparation process

Active Publication Date: 2016-07-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above two preparation methods are relatively similar, and both use the steady-state hydrothermal method. The sample preparation takes a long time, the steps are cumbersome, and the production efficiency is limited to a certain extent.

Method used

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  • Bismuth tungstate nanometer photocatalyst and method for preparing same
  • Bismuth tungstate nanometer photocatalyst and method for preparing same
  • Bismuth tungstate nanometer photocatalyst and method for preparing same

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preparation example Construction

[0033] The invention provides a preparation method of bismuth tungstate nano photocatalyst, comprising the following steps:

[0034] a) dissolving the bismuth source in acid to form a transparent solution;

[0035] b) dissolving the tungsten source in water with or without certain additives to form a transparent solution;

[0036] c) mixing the solution obtained in step a and step b with critical water in a certain very short time to obtain a product-containing suspension;

[0037] d) The resulting suspension then enters the cooling circuit and is collected;

[0038] e) performing solid-liquid separation on the collected suspension, washing and drying the solid to obtain the final bismuth tungstate nano photocatalyst.

[0039] In the invention, firstly, the bismuth source is dissolved in a certain concentration of dilute acid to obtain a transparent solution containing bismuth ions. In the present invention, the bismuth source is any acid-soluble bismuth salt, preferably bi...

Embodiment 1

[0049] Dissolve 40mmol of bismuth nitrate in 400ml of 0.4mol / L dilute nitric acid to obtain a bismuth source solution; dissolve 20mmol of sodium tungstate in 400ml of water to obtain a tungsten source solution; simultaneously extract bismuth source solution, tungsten source solution, and deionized water at 350°C and 22Mpa into the reactor, and the pressure is controlled at about 22Mpa for the reaction, the extraction flow rates are 5ml / min, 5ml / min and 20ml / min respectively, and the suspension is obtained after 7 to 8 seconds of reaction. Turbid liquid; the suspension enters the cooling pipeline and is collected after cooling, and the obtained suspension is subjected to 6000r / min high-speed centrifugation to obtain a solid, and the obtained solid is washed with deionization until the surface of the catalyst is neutral, and the solid is placed in a vacuum freeze dryer Medium dry.

[0050] The XRD spectrum of the obtained bismuth tungstate is completely consistent with the spect...

Embodiment 2

[0055] Dissolve 40mmol of bismuth nitrate in 400ml of 0.6mol / L dilute nitric acid to obtain a bismuth source solution; dissolve 20mmol of potassium tungstate in 400ml of water to obtain a tungsten source solution; simultaneously extract bismuth source solution, tungsten source solution, and deionized water at 400°C and 22Mpa into the reactor, and the pressure is controlled at about 22Mpa for the reaction, the extraction flow rates are 5ml / min, 5ml / min and 25ml / min, and the suspension is obtained after 6 to 7 seconds of reaction. Turbid liquid; the suspension enters the cooling pipeline and is collected after cooling, and the obtained suspension is subjected to 6000r / min high-speed centrifugation to obtain a solid, and the obtained solid is washed with deionization until the surface of the catalyst is neutral, and the solid is placed in a vacuum freeze dryer Medium dry.

[0056] The XRD spectrum of the obtained bismuth tungstate and JCPDS39#0256Bi 2 WO 6 Completely consistent...

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Abstract

The invention discloses a method for preparing a bismuth tungstate nanometer photocatalyst. The method includes mixing bismuth sources, tungsten sources and critical water with one another to obtain mixtures; separating solid from liquid; drying solid portions to obtain the bismuth tungstate nanometer photocatalyst. The invention further discloses the bismuth tungstate nanometer photocatalyst prepared by the aid of the method and application of the bismuth tungstate nanometer photocatalyst in the aspect of photocatalysis. The method, the bismuth tungstate nanometer photocatalyst and the application have the advantages that the bismuth sources and the tungsten sources are mixed with one another under the condition of the critical water within a short time to obtain the bismuth tungstate nanometer photocatalyst, accordingly, the method is easy to implement, good in repeatability and high in yield, and the reaction time can be greatly shortened as compared with the prior art.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a bismuth tungstate nano photocatalyst and a preparation method thereof. Background technique [0002] Nanophotocatalytic technology attempts to use the widespread solar energy to achieve water splitting, thereby realizing the removal of pollutants (NO x , NH 3 , VOCs, organic dyes, etc.) for the purpose of purification, and can also achieve the purpose of reducing carbon dioxide into organic energy. [0003] The development and preparation of high-efficiency photocatalysts is the key to photocatalytic technology. At present, the photocatalyst that has been produced and applied on a large scale is titanium dioxide nanoparticles, which can only use ultraviolet light with a wavelength less than 385nm, and has low utilization of solar energy. Some methods for improving the utilization efficiency of visible light have also been reported in the prior art, such as by doping n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/31B01J35/10B01D53/86B01D53/72C01G41/00C01B31/18C01B32/40
CPCB01D53/8668C01G41/00B01J23/31C01P2004/03C01P2002/72B01D2257/7027B01J35/40B01J35/613B01J35/39
Inventor 王海强孙朱行吴忠标翁小乐李钱
Owner ZHEJIANG UNIV
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