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Method for preparing self-doping nitrogen grading porous oxide by using biomass template

A hierarchical porous and biomass technology, applied in the preparation of oxides/hydroxides, etc., can solve the problems of non-porous and complex processes, and achieve the effects of low cost, simple process and strong versatility

Inactive Publication Date: 2008-08-27
SHANGHAI JIAO TONG UNIV
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology uses a sol-gel method to obtain nitrogen-doped titanium dioxide powder, but the nitrogen-doped titanium dioxide powder obtained by this technology does not have porous characteristics, and at the same time needs to introduce nitrogen source from the outside, and the process is relatively complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Choose C4 plant leaves—wheat leaves as raw materials, first fix fresh wheat leaves in glutaraldehyde PBS fixative solution at 4°C for 12 hours, wash the fixed leaves with pure water, soak the leaves in 5% HCl for 3 hours, and wash with Wash several times with distilled water, soak the leaves in an aqueous solution of titanium trichloride at 130°C for 3 hours; wash the treated leaves with pure water, soak them in an ethanol solution of tetrabutyl titanate and keep them at room temperature for 24 hours ; wash the soaked leaves with pure water and let it dry naturally; carry out high temperature treatment on it with a heating rate of 1°C / min in an oxygen atmosphere, and obtain a porous wheat leaf shape after holding at 500°C for 1 hour. Nitrogen-doped titanium dioxide material has good light capture and absorption properties in the range from ultraviolet light to visible light, and the overall absorption rate of visible light can exceed 12%.

Embodiment 2

[0028] The leaves of C4 plants—corn leaves were selected as raw materials. Fresh corn leaves were first fixed in glutaraldehyde PBS fixative solution at 4°C for 15 hours. The fixed leaves were washed with pure water, and the leaves were soaked in 8% HCl for 4 hours. Wash with distilled water several times, soak the leaves in an aqueous solution of zinc nitrate and keep at 100°C for 4 hours; wash the treated leaves with pure water, soak them in an aqueous solution of zinc nitrate and keep them at room temperature for 72 hours; wash and soak in pure water The dried leaves were allowed to dry naturally; they were subjected to high-temperature treatment in an oxygen atmosphere at a heating rate of 2°C / min, and a porous nitrogen-doped zinc oxide material with the shape of corn leaves could be obtained after holding at 600°C for 2 hours. It has good light capture and absorption properties in the ultraviolet and mid-infrared range, and the overall infrared absorption rate in the mid-i...

Embodiment 3

[0030] Choose C3 plant leaves—soybean leaves as raw materials, first fix fresh soybean leaves in glutaraldehyde PBS fixative solution at 4°C for 24 hours, wash the fixed leaves with pure water, soak the leaves in 10% HCl for 8 hours, and use Wash with distilled water several times, soak the leaves in an aqueous solution of ferric chloride at 120°C for 8 hours; wash the treated leaves with pure water, soak them in an aqueous solution of ferric chloride and keep them at room temperature for 120 hours; Wash the soaked leaves and let them dry naturally; perform high-temperature treatment at a heating rate of 5°C / min in an oxygen atmosphere, and obtain a porous nitrogen-doped iron oxide material in the form of soybean leaves after holding at 700°C for 5 hours. It has good light capture and absorption properties in the visible light range, and the overall absorption rate can reach 15%.

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Abstract

Disclosed is a process for preparing nitrogen self-doped hierarchical porous oxide in the technical field of functional material by employing biological templates, steps of which comprises 1) selecting fresh biomaterial to fix in glutaraldehyde PBS stationary liquid, 2) soaking the biomaterial, after being rinsed by pure water and fixed, in HCl, then rinsing the biomaterial by distilled water for a plurality of times, soaking the biomaterial in salt solution of metal M, 3) rinsing the biomaterial obtained from step 2) by pure water, soaking in the salt solution of metal M, 4) rinsing the obtained biomaterial from step 3) to obtain biomaterial which is naturally dried, then heating within the range of 500-1000 DEG C in an oxygen atmosphere and insulating to obtain the nitrogen-doped porous oxide N-MxOy. The nitrogen self-doped porous oxide prepared by the invention not only is provided with a biological porous structure, but also effectively realizes nitrogen self-doping, and has the obviously strengthened advantage of capturing and absorbing light wave with different wave ranges.

Description

technical field [0001] The invention relates to a preparation method in the technical field of oxide materials, in particular to a method for preparing self-doped nitrogen hierarchical porous oxides by using biomass templates. Background technique [0002] Oxide powders are widely used in photocatalysis, luminescent materials, magnetic materials, electromagnetic wave shielding and absorbing materials, electronic devices, dyes and other fields. Especially in the field of photocatalysis, according to the different types of oxides, it can exhibit unique shielding and absorption characteristics in the ultraviolet, visible, and infrared regions, and has good photofunctional activity. With the continuous development and maturity of oxide material preparation technology, people can prepare various types of oxides with different particle sizes, different components, and different structures. [0003] After searching the literature of the prior art, it is found that there are many l...

Claims

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Application Information

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IPC IPC(8): C01B13/14
Inventor 范同祥周涵李煦凡张荻
Owner SHANGHAI JIAO TONG UNIV
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