An indium-doped molybdenum carbide nanoflower core-shell photocatalyst and its preparation and application

A technology of photocatalyst and core-shell structure, which is applied in the field of photocatalytic materials, can solve the problems of poor photocatalytic reduction performance, easy recombination of photogenerated carriers, and poor selectivity of reduction products, achieving high CO2 reduction performance, low cost, and low cost. Effect of photogenerated electron-hole recombination rate

Active Publication Date: 2021-12-31
TONGJI UNIV
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Problems solved by technology

[0007] The purpose of the present invention is exactly in order to provide a kind of indium-doped molybdenum carbide nano flower core-shell structure photocatalyst and its preparation and application, to solve the above-mentioned Mo 2 C is the photocatalytic reduction of CO caused by the limited light absorption range of photocatalytic materials, few surface active sites, easy recombination of photogenerated carriers and / or poor selectivity of reduction products. 2 poor performance

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  • An indium-doped molybdenum carbide nanoflower core-shell photocatalyst and its preparation and application
  • An indium-doped molybdenum carbide nanoflower core-shell photocatalyst and its preparation and application
  • An indium-doped molybdenum carbide nanoflower core-shell photocatalyst and its preparation and application

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preparation example Construction

[0044] The invention provides a method for preparing an indium-doped molybdenum carbide nanoflower core-shell structure photocatalyst, comprising the following steps:

[0045] (1) Take MoCl 5 and 2-methylimidazole were respectively dissolved in a mixed solvent of ethanol and methanol, and then mixed and stirred to obtain a Mo LDH precursor solution;

[0046] (2) Add InCl to the Mo LDH precursor solution 3 , react, separate, wash, and dry to obtain an In-doped MoLDH precursor;

[0047] (3) Calcining the In-doped Mo LDH precursor to obtain the target product.

[0048] In some embodiments, in step (1), MoCl 5 The concentration of the solution obtained by dispersing into the mixed solvent is preferably 0.48mmol / ml, and the concentration of the solution obtained by dispersing 2-methylimidazole into the mixed solvent is preferably 0.48mmol / ml. More preferably, when mixing and stirring, the 2-methylimidazole solution is added dropwise to the MoCl 5 In the solution, during the dr...

Embodiment 1

[0092] A defect-rich indium-doped molybdenum carbide nanoflower core-shell structure photocatalyst mainly contains five main elements of In, Mo, O, C, and N, and is prepared by a method comprising the following steps:

[0093] (1) Preparation of Mo LDH

[0094] Take 0.41g MoCl respectively 5 and 1.32g of 2-methylimidazole were dissolved in 40mL of a mixed solution of ethanol and methanol, wherein the volume ratio of ethanol to methanol was 1:1, and the 2-methylimidazole solution was added dropwise to MoCl 5 In the solution, the dropping rate was controlled to be 0.5ml / min.

[0095] (2) Preparation of In@Mo LDH

[0096] Add 0.25 mmol of indium trichloride tetrahydrate to the Mo LDH turbid solution in step (1), and obtain In@Mo LDH by ion exchange method. After stirring for 12 hours, centrifuge with ethanol, wash and dry to obtain In@Mo LDH , where the rotational speed was controlled at 8000r / min for 10min, the obtained precipitate was washed with absolute ethanol at a contro...

Embodiment 2

[0117] A defect-rich indium-doped molybdenum carbide nanoflower core-shell structure photocatalyst mainly contains five main elements of In, Mo, O, C, and N, and is prepared by a method comprising the following steps:

[0118] (1) Preparation of Mo LDH

[0119] Take 0.41g MoCl respectively 5 and 1.32g of 2-methylimidazole were dissolved in 40mL of a mixed solution of ethanol and methanol, wherein the volume ratio of ethanol to methanol was 1:1, and the 2-methylimidazole solution was added dropwise to MoCl 5 In the solution, the dropping rate was controlled to be 0.5ml / min.

[0120] (2) Preparation of In@Mo LDH

[0121] Add 0.5 mmol of indium trichloride tetrahydrate to the Mo LDH turbid solution in step (1), and obtain In@Mo LDH by ion exchange method. After stirring for 12 hours, centrifuge with ethanol, wash and dry to obtain In@Mo LDH , where the rotational speed was controlled at 8000r / min for 10min, the obtained precipitate was washed with absolute ethanol at a control...

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Abstract

The invention relates to an indium-doped molybdenum carbide nanoflower core-shell structure photocatalyst and its preparation and application. The preparation method comprises the following steps: (1) taking MoCl 5 and 2-methylimidazole were respectively dissolved in a mixed solvent of ethanol and methanol, and then mixed and stirred to obtain a Mo LDH precursor solution; (2) adding InCl to the Mo LDH precursor solution 3 , react, separate, wash, and dry to obtain an In-doped Mo LDH precursor; (3) calcining the In-doped Mo LDH precursor to obtain the desired product. Compared with the prior art, compared with the prior art, the catalyst prepared by the present invention has a wider range of light absorption, and it reduces carbon dioxide (CO 2 ) ability is greatly improved, and it shows excellent CO 2 Reduction to carbon monoxide (CO) selectivity, at the same time the photocatalyst has low resistivity, fast carrier transfer ability, high photogenerated carrier separation ability, low carrier recombination rate, and good reduction of CO 2 cycle stability etc.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and relates to an indium-doped molybdenum carbide nano flower core-shell photocatalyst and its preparation and application. Background technique [0002] With the rapid development of industrialization and population growth, the demand for energy consumption is increasing globally, which is mainly solved by large-scale consumption of non-renewable fossil fuels, resulting in excess CO 2 produce. A lot of CO 2 Emissions lead to CO in the atmosphere 2 Concentrations have increased from 280ppm before the industrial revolution to more than 410ppm in 2019, drawing public attention to the issue of global warming. [0003] Global average temperatures have risen by more than 1°C from pre-industrial levels, with adverse effects on a range of environmental and anthropological issues. Therefore, it is crucial to substantially reduce CO 2 emissions. In the process of simulating natural ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/22C01B32/40
CPCB01J27/22B01J35/004C01B32/40
Inventor 陈作锋巩帅奇牛艳丽滕雪刘璇徐铭泽徐晨
Owner TONGJI UNIV
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