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BiOCl/graphite-like phase carbon nitride composite photocatalyst with (010) crystal face exposed and preparation method and application thereof

A graphite phase carbon nitride, composite light technology, applied in physical/chemical process catalysts, chemical instruments and methods, special compound water treatment, etc., to achieve high photocatalytic activity and promote separation effects

Active Publication Date: 2019-04-16
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] So far, although there are many reports on the preparation of BiOCl-based composite photocatalysts, most of them are BiOCl with exposed (001) crystal planes, and other crystal planes of BiOCl are used to recombine with other semiconductors, and few semiconductors can be selectively attracted by electrostatic attraction. Composite photocatalysts deposited on (100) and (001) crystal planes of BiOCl to expose (010) crystal planes

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  • BiOCl/graphite-like phase carbon nitride composite photocatalyst with (010) crystal face exposed and preparation method and application thereof
  • BiOCl/graphite-like phase carbon nitride composite photocatalyst with (010) crystal face exposed and preparation method and application thereof
  • BiOCl/graphite-like phase carbon nitride composite photocatalyst with (010) crystal face exposed and preparation method and application thereof

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preparation example Construction

[0029] The exposed (010) crystal plane BiOCl / g-C described in the present invention 3 N 4 The preparation method of composite photocatalyst comprises the following steps:

[0030] Step 1: Bi(NO 3 ) 3 ·5H 2 O, NaCl was dissolved in deionized water, and after stirring at room temperature for 1 h, the pH value was adjusted to 6 with 1 mol / L NaOH solution. After stirring at room temperature for 1 h, the reaction precursor solution was obtained, and the precursor solution was transferred to the hydrothermal reaction kettle. React at 160°C. After the reaction is completed and the temperature drops to room temperature, take out the reactor, let it stand to remove the supernatant, wash the precipitate with deionized water and absolute ethanol three times, and dry it at 70°C. BiOCl powder with exposed (010) crystal face was obtained after grinding; Bi(NO 3 ) 3 ·5H 2 The amount ratio of O and NaCl is 1:1.

[0031] Step 2: Weigh urea into an alumina crucible with a cover and plac...

Embodiment 1

[0040] Step 1: Mix 8mmol Bi(NO 3 ) 3 ·5H 2 Dissolve 0.8mmol NaCl in 48mL deionized water, stir at room temperature for 1h, adjust its pH to 6 with 1mol / L NaOH solution, and continue stirring at room temperature for 1h to obtain a reaction precursor, which is then transferred to a hydrothermal reactor , reacted at 160°C for 2 hours, and after the reaction temperature dropped to room temperature, the reactor was taken out, and the supernatant was removed by standing, and the precipitate was washed three times with deionized water and absolute ethanol respectively. After drying and grinding, BiOCl powder with exposed (010) crystal face is obtained;

[0041] Step 2: Weigh 30g of urea into an alumina crucible with a cover and place it in a muffle furnace, set the heating rate at 15°C / min, keep it at 550°C for 4h, cool to room temperature and grind to obtain a light yellow g-C 3 N 4 Powder;

[0042] Step 3: Weigh 0.3g of BiOCl powder with exposed (010) crystal plane and dissolv...

Embodiment 2

[0044] Step 1: Mix 8mmol Bi(NO 3 ) 3 ·5H 2 Dissolve 0.8mmol NaCl in 48mL deionized water, stir at room temperature for 1h, adjust its pH to 6 with 1mol / L NaOH solution, and continue stirring at room temperature for 1h to obtain a reaction precursor, which is then transferred to a hydrothermal reactor , reacted at 160°C for 4.5h, after the reaction temperature dropped to room temperature, the reactor was taken out, and the supernatant was removed by standing, and the precipitate was washed three times with deionized water and absolute ethanol respectively, and then heated at 70°C Obtain the BiOCl powder body that exposes (010) crystal face after drying and grinding;

[0045] Step 2: Weigh 30g of urea into an alumina crucible with a cover and place it in a muffle furnace, set the heating rate at 15°C / min, keep it at 550°C for 4h, cool to room temperature and grind to obtain a light yellow g-C 3 N 4 Powder;

[0046] Step 3: Weigh 0.3g of BiOCl powder with exposed (010) cryst...

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Abstract

The invention provides a BiOCl / graphite-like phase carbon nitride composite photocatalyst with a (010) crystal face exposed and a preparation method and application thereof. A light composite method is adopted, BiOCl is illuminated to generate electrons on the (010) crystal face, and holes are formed in the (100) and (001) crystal faces. The holes attract the layered structures g-C3N4 with negative charge through static electricity, the layered structures g-C3N4 are loaded on the (100) and (001) crystal faces with P4 / nmm (129) BiOCl as tetragonal phases and space point groups, and the BiOCl (010) crystal face is exposed to form the BiOCl / g-C3N4 composite photocatalyst with the (010) crystal face exposed. The formed BiOCl / g-C3N4 composite photocatalyst with the (010) crystal face exposed has relatively high photocatalytic activity.

Description

technical field [0001] The invention belongs to the field of functional materials, in particular to an exposed (010) crystal plane BiOCl / graphite-like carbon nitride (abbreviated as exposed (010) crystal plane BiOCl / g-C 3 N 4 ) composite photocatalyst and its preparation method and application. Background technique [0002] In recent years, environmental pollution has become increasingly serious, and semiconductor photocatalytic technology has attracted much attention due to its low energy consumption and no secondary pollution. [0003] The crystal structure of BiOCl is tetragonal chloropentite, which is a double Cl along the c-axis - layer and [Bi 2 o 2 ] 2+ A layered structure composed of alternating layers. The BiOCl layered structure is extremely sensitive to the pH of the surrounding environment, and the selective exposure of crystal faces can be achieved by controlling the pH. The photocatalytic activity of BiOCl depends largely on the exposure direction of its...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F101/38
CPCC02F1/30B01J27/24C02F2101/38C02F2305/10B01J35/39
Inventor 谈国强张丹王敏李斌任慧君夏傲
Owner SHAANXI UNIV OF SCI & TECH
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