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Full-inorganic non-lead perovskite compound TiO2 nanowire and preparation method thereof

An inorganic non-nanowire technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of short gap, poor photocatalytic effect, easy recombination of photogenerated electrons and holes, etc. To achieve the effect of changing wavelength range, wide wavelength range and improving photocatalytic efficiency

Inactive Publication Date: 2018-11-23
HENAN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TiO 2 Nanomaterials also have some shortcomings, such as TiO 2 The gap of nanomaterials is short, when light is irradiated, it can only absorb ultraviolet light, and under excitation conditions, photogenerated electrons and holes are easy to recombine, resulting in poor photocatalytic effect.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] An all-inorganic lead-free perovskite composite TiO 2 The preparation method of nanowire, concrete steps are:

[0035] Weigh 0.3g of titanium dioxide, add 30mL of 10mol / L sodium hydroxide solution, stir for 30min, then ultrasonically shake for 30min, put it into a 50mL hydrothermal kettle, react at 180°C for 24h, cool naturally to room temperature, and use a plastic spoon The precipitate at the bottom of the hydrothermal kettle was scraped off, washed repeatedly with deionized water until neutral, and then placed in a drying oven at 80° C. for 1 h to obtain titanate nanowires. Immerse the obtained titanate nanowires in 1mol / L hydrochloric acid solution for 24 hours, perform ion exchange to obtain titanate nanowires, wash them with deionized water, centrifuge, and repeat several times until the pH value is neutral. Then wash with absolute ethanol, centrifuge, and repeat several times. The precipitate was then transferred to a watch glass and dried at 80 °C for 1 h to o...

Embodiment 2

[0039] An all-inorganic lead-free perovskite composite TiO 2 The preparation method of nanowire, concrete steps are:

[0040] Adopt the method for embodiment 1 to prepare TiO 2 Nanowire, spare. Take 0.2mmol CsI in 10mL of deionized water, and add polyvinylpyrrolidone (PVP) equivalent to 0.5wt% of the final system, and ultrasonically stir for 10min until CsI is completely dissolved to obtain a cesium precursor. Take 0.2mmol ZnI 2 In 10mL of absolute ethanol, and ultrasonically stirred for 10min to ZnI 2 Completely dissolved to obtain the zinc precursor. Take 0.3 mmol KI in a beaker, and under ultrasonic stirring, add absolute ethanol until KI is completely dissolved to obtain an iodine source solution. Slowly add the prepared zinc precursor and iodine source solution to the cesium precursor drop by drop, and fully react for 30 minutes, then centrifuge, take the off-white precipitate, wash the precipitate with absolute ethanol and deionized water several times, and finally ...

Embodiment 3

[0043] An all-inorganic lead-free perovskite composite TiO 2 The preparation method of nanowire, concrete steps are:

[0044] Adopt the method for embodiment 1 to prepare TiO 2 Nanowire, spare. Take 0.2mmol CsI in 10mL of deionized water, and add polyvinylpyrrolidone (PVP) equivalent to 0.5wt% of the final system, and ultrasonically stir for 10min until CsI is completely dissolved to obtain a cesium precursor. Take 0.2mmol ZnI 2 In 10mL of absolute ethanol, and ultrasonically stirred for 10min to ZnI 2 Completely dissolved to obtain the zinc precursor. The above TiO 2 The nanowires are fully dispersed in the cesium precursor, and then the tin precursor is added under ultrasonic stirring to obtain a CsSnI 3 Composite TiO 2 Nanowires.

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Abstract

The invention provides a full-inorganic non-lead perovskite compound TiO2 nanowire and a preparation method thereof and belongs to the technical field of nano compound novel materials. The preparationmethod comprises the specific steps: preparing a titanate nanowire by a hydrothermal method; performing ion exchange on the prepared titanate nanowire, preparing titanic acid nanowire and then performing crystallization treatment to prepared and obtain a TiO2 nanowire; performing full-inorganic non-leak perovskite compounding on the prepared TiO2 nanowire to prepare and obtain the full-inorganicnon-lead perovskite compound TiO2 nanowire. According to the compound material, the advantages of the TiO2 nanowire structure are fully played; thus, a wavelength range of the TiO2 nanowire structureto absorb solar energy is widened, electron-cavity pair compounding is inhibited, and the photocatalytic efficiency of the TiO2 nanowire is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite new materials, in particular to an all-inorganic non-lead perovskite composite TiO 2 Nanowires and methods of making them. Background technique [0002] TiO 2 Nanomaterials are n-type semiconductor photosensitive materials with good performance. They are cheap, energy-saving and environmentally friendly, and are currently the most promising photosensitive semiconductor materials. However, TiO 2 Nanomaterials also have some shortcomings, such as TiO 2 The gaps of nanomaterials are short, and when light is irradiated, they can only absorb ultraviolet light, and under excitation conditions, photogenerated electrons and holes are easy to recombine, resulting in poor photocatalytic effect. In order to improve the TiO 2 The photocatalytic ability of nanomaterials has been extensively studied at home and abroad. TiO 2 There is no grain boundary in the internal structure of the nanowire, whic...

Claims

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Application Information

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IPC IPC(8): B01J27/138
CPCB01J27/138B01J35/39
Inventor 刘世凯周淑慧王俊健高新灿沈飞向张鹏黄龙飞
Owner HENAN UNIVERSITY OF TECHNOLOGY