利用粉煤灰制取白炭黑及其表面改性研究  

Study on preparation and surface modification of precipitated silica obtained from fly ash

作　　者：李秀悌[1] 姚志通[1] 孙杰[1] 张路[1] 夏枚生[1] 叶瑛[1] 

机构地区：[1]浙江大学海洋科学与工程学系,浙江杭州310028

出　　处：《功能材料》2010年第6期939-942,947,共5页Journal of Functional Materials

基　　金：国家高技术研究发展计划(863计划)资助项目(2007AA06Z128)

摘　　要：以粉煤灰为原料,与碳酸钠碱熔活化生成硅铝酸钠。硅铝酸钠与盐酸反应后,滤液经溶胶-凝胶转变得到产物白炭黑。随即利用γ-MPS硅烷偶联剂和硬脂酸分别对白炭黑分别进行表面改性。借助XRD、TG-DTA、FT-IR光谱、氮吸附等温线等手段对白炭黑改性前后进行表征。结果表明,白炭黑BET比表面积为364.80m2/g,平均孔径为6.02nm。TG-DTA和FT-IR光谱分析显示,两种改性剂成功接枝在了白炭黑表面。对比研究两种改性剂的改性效果发现,γ-MPS的改性效果较好。The fly ash,as a starting material,was subjected to alkaline fusion with sodium carbonate and formed NaAlSiO4.The resultlant reacted with HCl solution and the filtration was undertaken sol-gel transition process to obtain precipitated silica.Then,the surface modification of precipitated silica was conducted using silane coupling agent γ-MPS and stearic acid.The precipitated silica before and after modification were characterized by XRD,TG-DTA,FT-IR spectroscopy and nitrogen adsorption isotherms measurements.The results showed that the specific surface area and average pore diameter were 364.80m2/g and 6.02nm,respectively.The TG-DTA analysis and FT-IR spectroscopy indicated that modification agent had been successfully grafted onto the surface of precipitated silica.The γ-MPS showed good modification effect compared with that of stearic acid.

关 键 词：粉煤灰 白炭黑 表面改性 硅烷偶联剂 硬脂酸 

分 类 号：TF09[冶金工程—冶金物理化学]