METHOD FOR PREPARING NANOSILICON DIOXIDE WITH MODIFIED SURFACE FROM RICE HULL - WUHAN KAIDI GENERAL RES INST ENG & TECH CO LTD

Title:

METHOD FOR PREPARING NANOSILICON DIOXIDE WITH MODIFIED SURFACE FROM RICE HULL

Document Type and Number:

WIPO Patent Application WO/2013/185560

Kind Code:

A1

Abstract:

Disclosed is a method for preparing nanosilicon dioxide with a modified surface from rice hull, comprising the steps of: pre-treating rice hull with a treating gas containing CO2 to remove metal ions, impurities and dirt, drying and grinding; soaking for 4-8 hours in a diluted solution of phosphoric acid, boric acid, hydrochloric acid, formic acid, acetic acid, propionic acid, butyric acid, or a salt of a strong acid and a weak base with a concentration of 0.05-0.5 mol/L,the soaking temperature being no higher than 10°C, filtering by suction, removing the filtrate, and drying; and baking under anaerobic conditions at 300°C-450°C, so as to obtain the nanosilicon dioxide with a modified surface. The product has a particle size of 60-200 nm, an oil absorption value of 1.00-2.50 mL/g, a surface contact angle to water > 128°, and a BET specific surface area of 60-120 m2/g.

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Inventors:

TAO LEIMING (CN)
CHEN YILONG (CN)
ZHANG YANFENG (CN)
XUE YONGJIE (CN)

Application Number:

PCT/CN2013/076864

Publication Date:

December 19, 2013

Filing Date:

June 06, 2013

Export Citation:

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Assignee:

WUHAN KAIDI GENERAL RES INST ENG & TECH CO LTD (CN)

International Classes:

C01B33/18; B82Y30/00

Foreign References:

CN102730703A	2012-10-17
CN101837948A	2010-09-22
CN101253122A	2008-08-27
CN101244826A	2008-08-20
CN1039568A	1990-02-14
KR20010096628A	2001-11-08

Other References: