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Bismuth oxychloride-iron bismuth titanate composite photocatalyst and preparation method thereof

A bismuth oxychloride and photocatalyst technology, applied in the field of materials, can solve the problems of easy decomposition of harmful substances, low light energy utilization rate, instability, etc., and achieve effective absorption and utilization of visible light, good catalytic effect, and low cost.

Inactive Publication Date: 2015-04-15
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Description
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Problems solved by technology

[0004] The problem existing in the above prior art is that traditional TiO 2 Wide bandgap photocatalysts can only absorb and utilize ultraviolet light, which accounts for a small proportion of sunlight, and the light energy utilization rate is low; while narrow bandgap photocatalysts such as cadmium sulfide are usually unstable and easy to decompose harmful substances

Method used

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  • Bismuth oxychloride-iron bismuth titanate composite photocatalyst and preparation method thereof
  • Bismuth oxychloride-iron bismuth titanate composite photocatalyst and preparation method thereof
  • Bismuth oxychloride-iron bismuth titanate composite photocatalyst and preparation method thereof

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preparation example Construction

[0044] refer to figure 1 , which shows a flow chart of a preparation method embodiment of a bismuth oxychloride-iron bismuth titanate composite photocatalyst of the present invention, the method may specifically include:

[0045] Step 101, a hydrothermal synthesis step.

[0046] Dissolving bismuth source material, iron source material and titanium source material in dilute nitric acid solution at room temperature to obtain a mixed solution, adjusting the pH value of the mixed solution to 12-14 to obtain a suspension containing precipitates, and Heat at 160-220°C for 24-72 hours. Wash and dry the precipitate in the suspension to obtain powdered iron bismuth titanate photocatalyst. Wherein, the molar ratio of the bismuth source material to the sum of the iron source material and the titanium source material is (9:7) to (9:8), and the molar ratio of the iron source material to the titanium source material The ratio is (1:6)~(5:3).

[0047] Specifically, the amount of the iron s...

Embodiment 1

[0069] (1) At room temperature, BiCl 3 , FeCl 3 ·6H 2 O, TiCl 4 Soluble in 1M dilute nitric acid solution, the ratio of the amount of each raw material is n Bi :n Fe :n Ti =9:5:3. Then the pH value of the mixed solution was adjusted to 14 with 4M NaOH solution, and aged with stirring for 2 h. The suspension containing the precipitate was transferred to a reaction kettle and heated in an oven at 220°C for 24h. After the precipitate obtained by the hydrothermal method is centrifugally cleaned and dried, the obtained yellow powder product is the iron bismuth titanate photocatalyst.

[0070] (2) Dilute concentrated hydrochloric acid with a mass fraction of 36-38% to obtain a 2M dilute hydrochloric acid aqueous solution, take iron bismuth titanate powder, and put it into the 2M dilute hydrochloric acid solution with magnetic stirring for 1 hour. After a predetermined time, the mixed solution is centrifugally washed and dried, and finally the bismuth oxychloride-bismuth iron...

Embodiment 2

[0072] (1) At room temperature, the Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 9H 2 O, C 16 h 36 o 4 Ti is dissolved in 2M dilute nitric acid solution, and the ratio of the amount of each raw material is n Bi :n Fe :n Ti =5:1:3. Then the pH value of the mixed solution was adjusted to 13.6 with 4M NaOH solution, and aged with stirring for 2 h. The suspension containing the precipitate was transferred to a reaction kettle and heated in an oven at 200°C for 48h. After the precipitate obtained by the hydrothermal method is centrifugally cleaned and dried, the obtained yellow powder product is the iron bismuth titanate photocatalyst.

[0073] (2) Dilute concentrated hydrochloric acid with a mass fraction of 36-38% to obtain 1M dilute hydrochloric acid aqueous solution, take iron bismuth titanate powder, put it into 1M dilute hydrochloric acid solution and magnetically stir for 9 hours. After a predetermined time, the mixed solution is centrifugally washed and dried, and finally ...

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Abstract

The invention provides a bismuth oxychloride-iron bismuth titanate composite photocatalyst and a preparation method thereof. The method comprises the steps: a hydrothermal synthesis step comprising at room temperature, dissolving a bismuth source substance, an iron source substance and a titanium source substance in a dilute nitric acid solution to obtain a mixed solution, adjusting the pH value of the mixed solution to 12-14 to obtain a precipitate-containing suspension, under a condition of the temperature of 160-220 DEG C, heating and carrying out heat preservation for 24-72 h, and cleaning and drying the precipitate in the suspension to obtain a powdery iron bismuth titanate photocatalyst; and a hydrochloric acid treatment step comprising under a condition of room temperature or heating, putting the prepared iron bismuth titanate photocatalyst into a dilute hydrochloric acid solution with the molar concentration of 0.5-2 M, carrying out magnetic stirring for 1-24 h, and carrying out centrifugation cleaning and drying on the mixed solution, to obtain the bismuth oxychloride-iron bismuth titanate composite photocatalyst.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a preparation method of a bismuth oxychloride-iron bismuth titanate composite photocatalyst, and a bismuth oxychloride-iron bismuth titanate composite photocatalyst. Background technique [0002] In 1972, Japanese scientists Fujishima and Honda first discovered titanium dioxide (TiO 2 ) photocatalytic effect, that is, under a certain bias voltage, TiO 2 Under the irradiation of light, single crystal can decompose water into oxygen and hydrogen, which means that solar energy can photolyze water to produce hydrogen fuel. Since then, people began to study semiconductor photocatalysis. [0003] With today's rapid economic development, environmental pollution and energy shortage have become two major problems that people are facing. The use of light energy to deal with environmental pollution through photocatalysis has attracted more and more attention. This is the use of semicond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/135
Inventor 周豫李静波金海波陈卓王潇男
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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