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Preparation method of low-valence bismuth-enriched and preferably-orientated bismuth chlorobromoxide

A kind of bismuth oxychlorobromide, preferential orientation technology, applied in chemical instruments and methods, special compound water treatment, light water/sewage treatment, etc. Problems such as the preparation method of bismuth oxide, to achieve the effects of low cost, improved photocatalytic removal rate, and short synthesis period

Inactive Publication Date: 2018-04-20
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] So far, the work of the preparation method rich in low-valent bismuth bismuth oxybromide (010) has not been reported, and there are no patents and literature reports on the preparation method rich in low-valent bismuth bismuth oxybromide (010)

Method used

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  • Preparation method of low-valence bismuth-enriched and preferably-orientated bismuth chlorobromoxide
  • Preparation method of low-valence bismuth-enriched and preferably-orientated bismuth chlorobromoxide
  • Preparation method of low-valence bismuth-enriched and preferably-orientated bismuth chlorobromoxide

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Embodiment 1

[0020] Step 1, the Bi(NO 3 ) 3 ·5H 2 O dissolved in dilute HNO 3 , the mixed solution of KBr and KCl was added to the above solution, where Bi(NO 3 ) 3 ·5H 2 The concentration of O is 0.0075mol / L, Bi(NO 3 ) 3 ·5H 2 The molar ratio of O to (KBr+KCl) is 1:1, and the molar ratio of KBr to KCl is 0.95:0.05;

[0021] Step 2, the NaOH solution of 2mol / L is added dropwise in the solution that obtains in step 1, and the pH value of adjustment solution is 6;

[0022] Step 3, adding the solution containing suspended solids obtained in step 2 into the reactor, heating the reactor to 160°C, keeping it warm for 24 h, washing the precipitate in the reactor with deionized water in a vacuum filtration device, The pressure in the vacuum filtration device is 0.40p θ , bismuth oxybromide with preferred orientation of (010) was obtained after drying.

Embodiment 2

[0024] Step 1, the Bi(NO 3 ) 3 ·5H 2 O dissolved in dilute HNO 3 , the mixed solution of KBr and KCl was added to the above solution, where Bi(NO 3 ) 3 ·5H 2 The concentration of O is 0.0075mol / L, Bi(NO 3 ) 3 ·5H 2 The molar ratio of O to (KBr+KCl) is 1:1, and the molar ratio of KBr to KCl is 0.95:0.05;

[0025] Step 2, the NaOH solution of 2mol / L is added dropwise in the solution that obtains in step 1, and the pH value of adjustment solution is 6;

[0026] Step 3, adding the solution containing suspended solids obtained in step 2 into the reactor, heating the reactor to 160°C, keeping it warm for 24 h, washing the precipitate in the reactor with deionized water in a vacuum filtration device, The pressure in the vacuum filtration device is 0.40p θ , after drying, obtain (010) bismuth oxybromide with preferred orientation;

[0027] Step 4, a certain amount of bismuth oxybromide powder obtained in step 3 is put into H 2 In the atmosphere furnace, after vacuuming, H ...

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Abstract

The invention discloses a preparation method of low-valence bismuth-enriched and preferably-orientated bismuth chlorobromoxide, and solves the problems that the existing bismuth oxybromide is easy todissociate, weak in light absorption and low in photocatalytic efficiency. The preparation method comprises the following steps: firstly, through adjustment of the pH value of a bismuth nitrate solution, preparing a bismuth chlorobromoxide precursor; preparing (010) surface-preferably-orientated bismuth chlorobromoxide under a hydrothermal condition; then through control of an H2 atmosphere, performing heat treatment to obtain low-valence bismuth-enriched and preferably-orientated bismuth chlorobromoxide powder. The prepared low-valence bismuth-enriched bismuth chlorobromoxide (010) powder canpromote efficient separation of photoelectrons and holes, improve the separation efficiency of the photoelectrons and the holes, thereby improving the photocatalytic performance of the bismuth oxybromide. A low-valence bismuth-enriched and preferably-orientated bismuth chlorobromoxide photocatalyst can be used for deeply treating phenol in water under a simulated sunlight condition, and is an environment-friendly product.

Description

technical field [0001] The invention belongs to the field of functional materials, and relates to a preparation method of bismuth oxychlorobromide rich in low-priced bismuth and with preferred orientation. Background technique [0002] Energy shortage and environmental pollution are the major challenges facing human beings. Photocatalytic technology has broad development prospects in environmental purification and new energy development due to its unique properties such as deep reaction at room temperature and direct use of solar energy as a light source to drive the reaction. Bismuth oxybromide (BiOBr) is a photocatalyst with visible light photoactivity, and its crystal structure is tetragonal. The crystal structure of BiOBr can be viewed as a double Br - Ion layer and [Bi 2 o 2 ] 2+ The layers are arranged alternately to form a layered structure, but the double-layer arrangement of Br - The bismuth oxybromide belongs to the non-bonding force, the binding force is wea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06C02F1/30C02F101/34
CPCB01J27/06C02F1/30C02F2101/345C02F2305/10
Inventor 单连伟
Owner HARBIN UNIV OF SCI & TECH