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Preparation method of silver iodide/platy bismuth-rich type bismuth iodide composite photocatalytic material

A composite photocatalysis and silver iodide technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as time-consuming and energy-consuming, and achieve less time-consuming and energy-consuming, mild conditions, and excellent The effect of photocatalytic activity

Active Publication Date: 2018-06-22
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation of silver-based bismuth-rich bismuth oxyiodide complex often adopts hydrothermal method and high-temperature calcination method, which is time-consuming and energy-consuming.

Method used

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  • Preparation method of silver iodide/platy bismuth-rich type bismuth iodide composite photocatalytic material
  • Preparation method of silver iodide/platy bismuth-rich type bismuth iodide composite photocatalytic material
  • Preparation method of silver iodide/platy bismuth-rich type bismuth iodide composite photocatalytic material

Examples

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Effect test

Embodiment 1

[0023] Example 1: Preparation of silver iodide / plate-shaped bismuth-rich bismuth oxyiodide composite photocatalytic material

[0024] ① Add 0.97g Bi(NO 3 ) 3 ·5H 2 O was uniformly dispersed in 30 mL of ethylene glycol, weighed 0.332 g KI and dissolved in 10 mL of deionized water, added dropwise to the bismuth nitrate suspension, and then adjusted the pH to 7 with 1.5 M ammonia water. After stirring at room temperature for 2 h, BiOI was obtained by centrifugation, washing with deionized water three times, washing with ethanol three times, and finally drying at 70 °C for 8 h.

[0025]②Weigh 0.5g of BiOI prepared above, and disperse evenly in 50mL of deionized water under the action of magnetic stirring, add 1M NaOH dropwise, and finally add 0.1M AgNO according to the molar percentage of Bi / Ag of 17.8%. 3 , after stirring at room temperature for 1h, AgI / Bi 5 o 7 Complex I, labeled BA-4, was centrifuged, washed three times with deionized water, washed three times with ethanol...

Embodiment 2

[0027] Example 2: Preparation of silver iodide / plate-shaped bismuth-rich bismuth oxyiodide composite photocatalytic material

[0028] ① Add 0.97g Bi(NO 3 ) 3 ·5H 2 O was uniformly dispersed in 30 mL of ethylene glycol, weighed 0.332 g KI and dissolved in 10 mL of deionized water, added dropwise to the bismuth nitrate suspension, and then adjusted the pH to 7 with 1.5 M ammonia water. After stirring at room temperature for 2 h, BiOI was obtained by centrifugation, washing with deionized water three times, washing with ethanol three times, and finally drying at 70 °C for 8 h.

[0029] ②Weigh 0.5g of BiOI prepared above, and disperse evenly in 50mL deionized water under the action of magnetic stirring, add 1M NaOH dropwise, and finally add 0.1M AgNO according to the molar percentage of Bi / Ag 25.0% 3 , after stirring at room temperature for 1h, AgI / Bi 5 o 7 Complex I, labeled BA-5, was centrifuged, washed three times with deionized water, washed three times with ethanol, and ...

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Abstract

The invention discloses a preparation method of a silver iodide / platy bismuth-rich type bismuth iodide composite photocatalytic material. The method includes the steps that firstly, Bi(NO3)3 5H2O andKI serve as raw materials, BiOI is prepared through a chemical precipitation method, BiOI powder is evenly dispersed in water, NaOH serves as a precipitation transforming agent, AgNO3 serves as a silver source, under a stirring condition, a sodium hydroxide solution and a silver nitrate agent are sequentially dropwise added into BiOI turbid liquid, and a AgI / Bi5O7I composite is generated through an in-situ deposition / precipitation transforming method. According to the AgI / Bi5O7I composite prepared through the method, AgI tightly binds to Bi5O7I, heterojunctions are formed, and excellent photocatalytic activity is generated under the synergistic effect of AgI and Bi5O7I. The preparation method is carried out at room temperature, has moderate conditions, and is short in reaction time, easy and convenient to operate and capable of being used for large-scale industrial production, and energy saving and environmental protection are achieved.

Description

technical field [0001] The invention relates to a preparation method of a silver iodide / plate-shaped bismuth-rich bismuth oxyiodide composite photocatalytic material, belonging to the field of photocatalytic material preparation. Background technique [0002] Novel Bismuth Oxyhalides Responsive to Visible Light x o y x z The semiconductor-based photocatalyst has a unique crystal structure and excellent photocatalytic activity, which can effectively degrade organic pollutants and reduce carbon dioxide. BiOI has a very narrow band gap (1.8eV), but because of its positive conduction band position, electrons and holes are easy to recombine, resulting in insufficient reducibility and poor thermal stability. Bismuth-rich bismuth oxyhalide Bi x o y x z The family includes Bi 4 o 5 I 2 、 Bi 7 o 9 I 3 、 Bi 5 o 7 I and so on. Bi 5 o 7 I and BiOI elements are the same, have the [Bi 2 o 2 ] 2+ The unique layered crystal structure composed of double I ion layers, thus...

Claims

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Application Information

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IPC IPC(8): B01J27/06C02F1/30C02F101/30C02F101/20
CPCC02F1/30B01J27/06C02F2101/30C02F2101/20C02F2305/10B01J35/39
Inventor 姜炜杨楠李强钟素婷钱丹林韩素娟耿雪其邵方
Owner NANJING UNIV OF SCI & TECH
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