中文摘要：

以稻壳为硅源,γ-氨丙基三乙氧基硅烷（APTES）为改性剂,制备改性磁性介孔SiO_2（NMMS）,研究了搅拌时间、温度及料液比对氨基接枝率的影响;同时,对NMMS的结构进行表征,并初步测定了其对AFB1的吸附效果。结果表明,搅拌时间、温度及料液比对氨基接枝率的影响均显著,制备NMMS的最优工艺条件为：搅拌时间10 h,温度80℃,料液比1∶3,氨基接枝率最高为（13.3±0.2）%;NMMS具有良好的磁分离特性,且氨基嫁接成功;其孔道有序,孔径和比表面积分别为2.03 nm和205.88 m2/g,对AFB1的脱除率可达（83.96±2.74）%,约为未改性的磁性介孔SiO_2（MMS）的2倍。因此,氨基改性有利于NMMS对AFB1的吸附,达到有效脱除AFB1的目的。

英文摘要：

In the paper,the APTES- modified magnetic mesoporous silica（ NMMS） had been synthesized from rice husk to effectively remove aflatoxin B_1（ AFB_1）. The effects of stirring time,temperature and solid- liquid（ MMS- APTES） ratio on amino grafting rate had been studied to establish the optimum condition of NMMS preparation. The structural properties of NMMS and its absorbability for AFB_1 were also determined. The experimental results showed that the optimum conditions for amino modification were as follows： stirring time 10 h,temperature 80 ℃,and solid- liquid ratio 1∶ 3; on this condition the amino grafting rate could be（ 13. 3 ± 0. 2） %. The amino group could be successfully grafted onto MMS. NMMS had an ordered pore structure and fine magnetic separation characteristics; pore size was 2. 03 nm and specific surface area was 205. 884 m~2/ g. The AFB_1 removal ratio of NMMS was（ 83. 96 ± 2. 74） %,which was two times of that of MMS. The results indicated that amino modification was benefit to NMMS for AFB_1 adsorption,which could be used remove AFB_1 in AFB_1- contaminated grain and oil.