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Microballoons with large ball diameter of nano crystal grain Ti02 and preparing method as well as its application

A technology of nanocrystalline grains and microspheres, which is applied in the field of large-diameter nanocrystalline TiO2 microspheres and their preparation and application fields, can solve the problems of photocatalyst loss and shedding, etc.

Inactive Publication Date: 2003-05-07
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Loaded TiO 2 Although the photocatalyst overcomes the TiO 2 Nano-powder is difficult to separate and recover, but due to TiO 2 Nanopowder is only loaded on the surface of the carrier by physical adsorption, so it is easy to fall off from the surface of the carrier during repeated use, resulting in the loss of photocatalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0022] Mix 100ml of tetrabutyl titanate and 100ml of absolute ethanol thoroughly, take another 110ml of absolute ethanol, adjust the pH value to 2.5-3.5 with hydrochloric acid, and then add it to the above-mentioned mixture of tetrabutyl titanate and absolute ethanol , stirred for 30 minutes to make it fully mixed to obtain clear and transparent TiO 2 Sol.

[0023] Get 4g of urea and dissolve it in 30ml of water, and add this aqueous urea solution to 60ml of TiO2 under stirring. 2 Make it fully mixed in the sol, then add 7ml of formaldehyde dropwise, after fully mixed, add this mixed solution to 3000ml of liquid paraffin dispersion medium, stir, heat up to 70°C and react for 2.5 hours to obtain a milky white polymer-TiO 2 Composite microspheres, air-dried, roasted in a high-temperature roaster for one hour and raised the temperature to 500°C, and roasted in air (flow rate 110L / hour) for 1.5 hours to decompose the polymer to obtain TiO 2 porous microspheres. The obtained mic...

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PUM

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Abstract

A big-diameter (200-500 microns) TiO2 microsphere with nano crystal grain (10-40 nm) is disclosed, which has anataste type or rutile type, high specific surface area (40-120 sq.m / g) and high pore volume (0.1-0.2 cu.cm / g). It is prepared through reaction between urea, TiO2 sol and formaldehyde and calcining, and conbe used to treat organic sewage.

Description

Technical field [0001] The invention relates to large-diameter nanocrystalline TiO 2 Preparation method of microspheres and its application to photocatalytic degradation of organic polluted wastewater. Background technique [0002] Nano-TiO 2 Powder photocatalysts are mainly used to treat various types of polluted wastewater, and their degradation targets involve various important organic compounds such as phenols, dyes, hydrocarbons, surfactants, organic pigments, halogenated aromatics, polycyclic aromatic Some inorganic compounds, through TiO 2 Photocatalytic degradation of , which can mineralize them into water and CO 2 , it can be seen that TiO 2 Nano-powder photocatalytic degradation method, as a new technology of water treatment, has broad application prospects. However, due to the nano-TiO 2 Powder has the problem of being difficult to recycle and reuse in the process of wastewater treatment, and it has not been practically applied in wastewater treatment so far...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J35/00C01G23/047C01G23/053C01G23/08C02F1/30
Inventor 张保龙石可瑜何尚锦杨克莲陈百顺张育英杜宗杰
Owner NANKAI UNIV