发明名称 |
Method for preparing surface-modified nanosilicon dioxide from rice hulls |
摘要 |
A method for preparing surface-modified nano silicon dioxide from rice hulls. The method includes: 1) pretreating rice hulls using a treating gas containing CO2 to remove metal ions, impurities, and dusts, and desiccating and grinding the rice hulls; 2) submerging the rice hulls into a dilute solution of phosphoric acid, boric acid, hydrochloric acid, formic acid, acetic acid, propionic acid, butyric acid, or a strong-acid-weak-base salt for between 4 and 8 hrs, controlling the immersion temperature not to exceed 10° C., leaching a resulting mixture, removing a filtrate, and desiccating the rice hulls; and 3) calcining the rice hulls in the absence of oxygen at a temperature of between 300 and 450° C. |
申请公布号 |
US9127022(B2) |
申请公布日期 |
2015.09.08 |
申请号 |
US201414569771 |
申请日期 |
2014.12.14 |
申请人 |
Wuhan Kaidi Engineering Technology Research Institute Co., Ltd. |
发明人 |
Tao Leiming;Chen Yilong;Zhang Yanfeng;Xue Yongjie |
分类号 |
C01B33/023;C07F7/02 |
主分类号 |
C01B33/023 |
代理机构 |
Matthias Scholl P.C. |
代理人 |
Matthias Scholl P.C. ;Scholl Matthias |
主权项 |
1. A method for preparing surface-modified nano silicon dioxide from rice hulls, the method comprising:
1) pretreating rice hulls using a treating gas containing CO2 to remove metal ions, impurities, and dusts, and desiccating and grinding the rice hulls; 2) submerging the rice hulls into a dilute solution of a solute selected from the group consisting of phosphoric acid, boric acid, hydrochloric acid, formic acid, acetic acid, propionic acid, butyric acid, or a strong-acid-weak-base salt for between 4 and 8 hrs, controlling an immersion temperature not to exceed 10° C., leaching a resulting mixture, removing a filtrate, and desiccating the rice hulls; and 3) calcining the rice hulls in the absence of oxygen at a temperature of between 300 and 450° C., whereby obtaining a surface-modified nano silicon dioxide. |
地址 |
Wuhan CN |