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Preparation of a two-dimensional network-like cross-linked structure tio responsive to visible light 2 Methods for neutral hydrosols

A two-dimensional network and cross-linked structure technology, applied in the field of material science, can solve the problems of TiO2 hydrosol that have not been reported.

Inactive Publication Date: 2016-04-06
NANJING BEILIDA NEW MATERIAL SYST ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, people use H 2 o 2 or HNO 3 Assisted reflow method obtained TiO 2 Nanoparticle-like hydrosols, but the preparation of TiO2 hydrosols with a two-dimensional structure has not been reported

Method used

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  • Preparation of a two-dimensional network-like cross-linked structure tio responsive to visible light <sub>2</sub> Methods for neutral hydrosols
  • Preparation of a two-dimensional network-like cross-linked structure tio responsive to visible light <sub>2</sub> Methods for neutral hydrosols
  • Preparation of a two-dimensional network-like cross-linked structure tio responsive to visible light <sub>2</sub> Methods for neutral hydrosols

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0021] (1) NH with a mass concentration of 2wt% 3 h 2 The O solution was added to a titanium sulfate aqueous solution with a mass concentration of 2wt%, and the pH was adjusted to 7 and kept for 0.5h to obtain a white precipitate;

[0022] (2) Filter and wash the white precipitate until the corresponding impurity anions are no longer detected to obtain a neutral white precipitate;

[0023] (3) Mix the neutral white precipitate with distilled water at a ratio of 0.03:1, ultrasonically disperse and heat to 30 o C; At the same time, add H with a mass percentage of 1:10 with the neutral white precipitate 2 o 2 solution to obtain a transparent orange-yellow peroxotitanic acid solution (PTA);

[0024] (4) Add a certain amount of melamine as a nitrogen source to the peroxotitanic acid (PTA) sol synthesized in step (3) to obtain a suspension, and control the doping concentration of nitrogen to 1 at%;

[0025] (5) After the suspension was stirred for 10 min, it was transferred to ...

Embodiment example 2

[0027] (1) NH with a mass concentration of 10wt% 3 h 2 The O solution was added to a titanyl sulfate aqueous solution with a mass concentration of 6 wt%, and the pH was adjusted to 7 and maintained for 3 hours to obtain a white precipitate;

[0028] (2) Filter and wash the white precipitate until the corresponding impurity anions are no longer detected to obtain a neutral white precipitate;

[0029] (3) Mix the neutral white precipitate with distilled water at a ratio of 0.06:1, ultrasonically disperse and heat to 30-60 o C; At the same time, add H with a mass percentage of 1:40 to the neutral white precipitate 2 o 2 solution to obtain a transparent orange-yellow peroxotitanic acid solution (PTA);

[0030] (4) Add a certain amount of melamine as a nitrogen source to the peroxotitanic acid (PTA) sol synthesized in step (3) to obtain a suspension, and control the doping concentration of nitrogen to 10at%;

[0031] (5) After the suspension was stirred for 60 min, it was tran...

Embodiment example 3

[0033] (1) NH with a mass concentration of 5wt% 3 h 2 The O solution was added to a titanium tetrachloride aqueous solution with a mass concentration of 3wt%, and the pH was adjusted to 7 and kept for 2h to obtain a white precipitate;

[0034] (2) Filter and wash the white precipitate until the corresponding impurity anions are no longer detected to obtain a neutral white precipitate;

[0035] (3) Mix the neutral white precipitate with distilled water at a ratio of 0.04:1, ultrasonically disperse and heat to 40 o C; at the same time, add H with a mass percentage of 1:20 to the neutral white precipitate 2 o 2 solution to obtain a transparent orange-yellow peroxotitanic acid solution (PTA);

[0036] (4) Add a certain amount of melamine as a nitrogen source to the peroxotitanic acid (PTA) sol synthesized in step (3) to obtain a suspension, and control the doping concentration of nitrogen to 5 at%;

[0037] (5) After the suspension was stirred for 30 min, it was transferred t...

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Abstract

The invention discloses a method for preparing TiO2 neutral hydrosol with visible-light response and a two-dimensional network-like cross-linked structure. The nitrogen-doped TiO2 hydrosol is synthesized by virtue of a one-step hydrothermal method and the method comprises the following specific steps: (1) adding NH3.H2O into an aqueous solution of titanium salt and adjusting the pH to 7; (2) filtering and washing obtained white precipitate until the corresponding impurity anions are not detected; (3) ultrasonically dispersing the white precipitate in distilled water, heating to 40 DEG C, adding an H2O2 solution to obtain transparent orange peroxy titanic acid solution (PTA); (4) adding a certain amount of melamine as a nitrogen source into the peroxy titanic acid as (PTA) gel to obtain a suspension; and (5) stirring the suspension for 10-60 minutes, transferring to a hydrothermal reactor and carrying out hydrothermal reaction for 4-12 hours to obtain the yellow nitrogen-doped TiO2 hydrosol after the reaction is completed. The synthesized TiO2 hydrosol is of a two-dimensional network-like cross-linked structure and exhibits good photocatalytic self-cleaning capability under visible light.

Description

technical field [0001] The invention belongs to the field of material science, and relates to a two-dimensional network cross-linked structure TiO prepared in response to visible light 2 neutral hydrosol method. Background technique [0002] Nanocrystalline TiO 2 It has received great attention in the fields of photocatalytic decomposition of organic matter and self-cleaning. However, due to TiO 2 The bandgap width of TiO is relatively large, about 3.2eV, and it can only absorb ultraviolet light in sunlight, which greatly limits its further application. Therefore, for TiO 2 It is especially necessary to modify it so that it absorbs visible light. Nitrogen doped to TiO 2 The interior of the crystal can make it absorb visible light, and there are a lot of researches on the preparation of nitrogen-doped TiO 2 and photocatalytic applications. Traditional doping of nitrogen to TiO 2 The methods include ammonia calcination, hydrothermal assisted synthesis and one-step chem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053C04B41/50
Inventor 熊吉如
Owner NANJING BEILIDA NEW MATERIAL SYST ENG