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Method for preparing biomass carbon-based metal-modified self-doped vacancy-rich tin oxide nano-composite photocatalytic materials

A technology of photocatalytic materials and biomass carbon, which is applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, tin oxide, etc. Complicated process and other issues, to achieve the effect of controllable shape and size, narrow particle size distribution, and low preparation temperature

Inactive Publication Date: 2019-01-04
PINGDINGSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above preparation methods all have their unique advantages, but most of the disadvantages lie in the complicated preparation process, multi-step reaction, unfriendly raw materials, and easy falling off of supported metals, etc.

Method used

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  • Method for preparing biomass carbon-based metal-modified self-doped vacancy-rich tin oxide nano-composite photocatalytic materials

Examples

Experimental program
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Effect test

Embodiment 1

[0036] 1) Heat the biomass waste coconut shell from room temperature to 200 °C for 5 hours at a heating rate of 2 °C / min in a nitrogen atmosphere, and cool to room temperature after the reaction to obtain a biomass carbon skeleton;

[0037] 2) get 1mmol analytically pure tin protochloride (SnCl 2 ) and 5mmol of citric acid are fully dissolved in 8mL of absolute ethanol, then add 2mmol of tea polyphenols and 10mL of deionized water successively and adjust its pH value to 8 with 2mol / L NaOH solution to obtain solution A. In the ice-salt bath of NaCl and crushed ice, use a constant temperature magnetic stirring device to carry out continuous magnetic stirring at 10°C;

[0038] 3) get 0.1mmol analytically pure chloroplatinic acid (H 2 PtCl 6 ), 3mmol silver nitrate (AgNO 3 ) and 5 mmol of citric acid were fully dissolved in 8 mL of deionized water, and then mixed uniformly at 10°C with a constant temperature magnetic stirring device in an ice-salt bath of NaCl and crushed ice t...

Embodiment 2

[0043] 1) Under an argon atmosphere, the biomass waste leaves were heated from room temperature to 300 °C at a heating rate of 4 °C / min for 3 hours, and the reaction was completed and cooled to room temperature to obtain a biomass carbon skeleton;

[0044] 2) get 1mmol analytically pure tin protochloride (SnCl 2 ) and 8mmol of citric acid are fully dissolved in 14mL of absolute ethanol, then add 6mmol of tea polyphenols and 21mL of deionized water successively and adjust its pH value to 6 with 5mol / L NaOH solution to obtain solution A. In the ice-salt bath of NaCl and crushed ice, use a constant temperature magnetic stirring device to continuously magnetically stir it at 0°C;

[0045] 3) get 0.3mmol analytically pure chloroplatinic acid (H 2 PtCl 6 ), 2mmol chloroauric acid (HAuCl 4 ) and 8 mmol of citric acid were fully dissolved in 15 mL of deionized water, and then mixed uniformly at 0°C with a constant temperature magnetic stirring device in an ice-salt bath of NaCl and...

Embodiment 3

[0051] 1) The biomass waste banana peel was heated from room temperature to 400 °C for 0.5 h at a heating rate of 8 °C / min in a nitrogen atmosphere, and the reaction was completed and cooled to room temperature to obtain a biomass carbon skeleton;

[0052] 2) get 1mmol analytically pure tin protochloride (SnCl 2 ) and 12mmol of citric acid are fully dissolved in 20mL of absolute ethanol, then add 10mmol of tea polyphenols and 25mL of deionized water successively and adjust its pH value to 4 with 8mol / L NaOH solution to obtain solution A. In the ice-salt bath of NaCl and crushed ice, use a constant temperature magnetic stirring device to carry out continuous magnetic stirring at 10°C;

[0053] 3) Take 1mmol silver nitrate (AgNO 3 ), 6mmol copper nitrate (Cu(NO 3 ) 2 ) and 13mmol of citric acid were fully dissolved in 20mL of deionized water, and then mixed uniformly at 10°C with a constant temperature magnetic stirring device in an ice-salt bath of NaCl and crushed ice to ob...

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Abstract

The invention discloses a method for preparing biomass carbon-based metal-modified self-doped vacancy-rich tin oxide nano-composite materials. The method includes loading and dispersing metal-modifiedself-doped vacancy-rich tin oxide semiconductor heterojunctions in biomass carbon bases in chemical bond complexation forms to obtain composite photocatalyst materials. Self-doped vacancy-rich tin oxide is selected from Sn-doped nonstoichiometric or mixed valence state oxygen-vacancy-rich tin oxide; metal nano-particles with plasma resonance effects are loaded on self-doped vacancy-rich tin oxidenano-particles to obtain metal-modified self-doped vacancy-rich tin oxide. The method has the advantages that the photo-induced electron-hole separation rate of the biomass carbon-based metal-modified self-doped vacancy-rich tin oxide nano-composite materials can be sufficiently increased during photocatalytic reaction by the aid of the visible-light photocatalytic oxidation and reduction characteristics of the self-doped vacancy-rich tin oxide, the plasma resonance effects of the metal nano-particles, the electric conductivity of biomass carbon-based materials and chemical bonding heterojunction structures between three components, and accordingly the method is favorable for improving the photocatalytic oxidation and reduction pollutant degradation and photocatalytic water decompositionhydrogen production performance of the biomass carbon-based metal-modified self-doped vacancy-rich tin oxide nano-composite materials.

Description

technical field [0001] The invention relates to a preparation method of a tin oxide nanocomposite material, in particular to a preparation method of a biomass carbon-based metal modified self-doping defect-rich tin oxide nanocomposite photocatalytic material. Background technique [0002] Carbon nanomaterials have good photo-induced electron transfer and two-photon absorption characteristics, and may be used as powerful energy converters in the design of photocatalysts, and have broad applications in the fields of degrading harmful substances in the environment and producing hydrogen energy. prospect. However, at present, the photocatalytic efficiency of single-structure carbon materials is not ideal, which greatly restricts their practical applications. Therefore, it is extremely important to develop and explore carbon-based composite photocatalysts with new structures. Nanoscale noble metals have attracted extensive attention due to their strong absorption in the visible...

Claims

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Application Information

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IPC IPC(8): B01J23/89C01B3/04C01G19/02
CPCC01B3/042C01G19/02B01J23/8966C01B2203/0277C01B2203/1076C01P2004/03B01J35/39Y02E60/36
Inventor 杨柳青
Owner PINGDINGSHAN UNIVERSITY
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