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catio 3 @znin 2 the s 4 Nanocomposite materials and their preparation methods and applications

A nanocomposite material, znin2s4 technology, applied in the field of photocatalysis, can solve the problems of reduced solar energy utilization, low visible light absorption, large forbidden band width, etc., to achieve the effects of easy purchase, abundant resources, and easy operation

Active Publication Date: 2022-04-29
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, CaTiO 3 It has a large band gap and low absorption of visible light, which reduces the utilization rate of solar energy and limits its application in the field of photocatalytic hydrogen production from water

Method used

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  • catio <sub>3</sub> @znin <sub>2</sub> the s <sub>4</sub> Nanocomposite materials and their preparation methods and applications
  • catio <sub>3</sub> @znin <sub>2</sub> the s <sub>4</sub> Nanocomposite materials and their preparation methods and applications
  • catio <sub>3</sub> @znin <sub>2</sub> the s <sub>4</sub> Nanocomposite materials and their preparation methods and applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Put 0.25mmol calcium nitrate in a beaker, add 5mL deionized water and stir for 10min to form a uniform solution, then add 0.84mmol tetrabutyl titanate and 0.84mmol polyethylene glycol-200 dropwise to the solution, stir 30min, and then add 1.68×10 -4 1 mmol of sodium hydroxide aqueous solution, stirred evenly, moved the solution to a 50mL stainless steel reaction kettle with a polytetrafluoroethylene liner, and reacted at 200°C for 17h; after natural cooling, the reaction solution was centrifuged, washed, dried, and collected , to obtain hollow CaTiO 3 cuboid;

[0028] (2) Take 10.5 mg of the hollow CaTiO obtained in step (1) 3 The cuboid was moved into an oil bath, and 37.8 mg of zinc chloride, 61.95 mg of indium chloride, and 42 mg of thioacetamide were heated to 80 °C at a rate of 2 °C / min in an air atmosphere, and the oil bath was stirred for 3 hours to obtain CaTiO 3 @ZnIn 2 S 4 nanocomposites.

[0029] For the hollow CaTiO prepared in step (1) 3 The cub...

Embodiment 2

[0032] In CaTiO 3 @ZnIn 2 S 4 No addition of hollow CaTiO during the preparation of nanocomposites 3 Cuboid, all the other reagent consumptions and operation steps are with the step 2 of embodiment 1.

Embodiment 3

[0034] In CaTiO 3 @ZnIn 2 S 4 No addition of ZnIn during the preparation of nanocomposites 2 S 4 , all the other reagent consumption and operation steps are the same as step 1 of embodiment 1.

[0035] Carry out XRD test to the product that embodiment 1,2 and 3 obtains, test result sees image 3 . As shown, the CaTiO 3 @ZnIn 2 S 4 Comparing the X-ray diffraction peaks of nanocomposites with those of a single material, it can be seen that CaTiO 3 with ZnIn 2 S 4 Successful recombination, the diffraction peaks match the corresponding crystal planes and there are no impurity peaks.

[0036] The specific analysis is as follows: the strong diffraction peaks at 2θ = 23.1°, 32.9°, 59.0° and 69.5° are consistent with the perovskite CaTiO3 The (101), (121), (042) and (242) crystal planes (PDF#22-0153) match. The strong diffraction peaks at 27.8° and 48.4° are consistent with the ZnIn 2 S 4 The (311) and (440) crystal planes (PDF #48-1778) match. According to these conclu...

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Abstract

The present invention provides CaTiO 3 @ZnIn 2 S 4 Nanocomposite with hollow CaTiO 3 Cuboid as the substrate, the ternary sulfide ZnIn 2 S 4 The nanosheets are uniformly coated on the outer layer of the cuboid. Compared with the prior art, the CaTiO provided by the present invention 3 @ZnIn 2 S 4 Nanocomposite materials, the raw materials used are easy to purchase, rich in resources and low in price, green and environmentally friendly, and the preparation method is simple, easy to operate, and convenient for large-scale production; the CaTiO prepared by the present invention 3 @ZnIn 2 S 4 As a photocatalyst, the nanocomposite material has significantly improved the hydrogen production, and the photocatalytic hydrogen production reached 125016.4 μmol / g within 6 hours, and maintained good cycle stability during the photocatalytic hydrogen production process.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to photocatalyst CaTiO 3 @ZnIn 2 S 4 Nanocomposites and their preparation methods and applications. Background technique [0002] Since the early 1970s, Fujishima and Honda discovered TiO 2 Since it can be used for photocatalytic splitting of water to produce hydrogen, splitting water to produce hydrogen has become one of the most promising methods to solve the problems of energy crisis and environmental pollution. So far, great progress has been made in the application of photocatalytic water splitting to hydrogen production using semiconductor materials as photocatalysts. In order to improve the hydrogen production rate, the selected semiconductor photocatalyst should meet various criteria, such as having a matched band gap to absorb solar energy as much as possible, effectively separating photogenerated electrons and holes, satisfying the redox potential for water spli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/04B01J37/02B82Y30/00B82Y40/00C01B3/04
CPCB01J27/04B01J35/004B01J37/0215B82Y30/00B82Y40/00C01B3/042C01B2203/0277C01B2203/1041Y02E60/36
Inventor 韩吉姝戴方旭王磊赵瑞阳杨宇陈瑞欣
Owner QINGDAO UNIV OF SCI & TECH
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