摘要
利用热重(TG)、X射线衍射(XRD)、扫描电子显微镜(SEM)等测试手段综合分析研究了凹凸棒石在热处理过程中其结构、形貌的变化。结果表明:凹凸棒石的微观结构随热处理温度的升高呈现显著的变化。当热处理温度30℃至300℃,凹凸棒石先后脱去外表面吸附水、孔道水、部分结晶水,凹凸棒石结构、形貌没有任何变化。在470℃,脱去凹凸棒石的剩余结晶水,凹凸棒石110晶面特征衍射峰逐渐变弱,凹凸棒石的结构开始发生改变。在600℃左右,缓慢脱去凹凸棒石的结构水,孔道结构完全塌陷。在800℃,凹凸棒石晶体原有的结构完全被破坏,棒状形貌消失,出现了烧结现象。
The structural and morphological properties of attapulgite during heat treatment were studied by thermo- gravimetric（TG）, X-ray diffraction（XRD） and scanning electron microscope （SEM）. The results indicated that as the heat treatment temperature was increased, the micro-crystal structure of attapulgite displaied significant changes. Water was ab- sorbed in the channel and outside surface of the attapulgite and some of the water in the attapulgite were lost when the heat treatment temperature between 30℃ and 300℃ . However, the structure and morphology of the attapulgite were remained and unchanged. Residual water in the attapulgite was lost at 470℃ and the characteristic diffraction peaks of the attapulgite in 110 crystal faces became weaker while the structure of attapulgite began to change. Hydroxyls were lost at 600℃, de- grading the channel structure. The morphology of attapulgite fibers was destroyed and appeared sintering phenomenon after heat treatment over 800℃.
出处
《化工新型材料》
CAS
CSCD
北大核心
2013年第6期143-145,共3页
New Chemical Materials
基金
湖北省自然科学基金项目(2011CDC040
2010CDB00903)
湖北省高等学校优秀中青年科技创新团队计划项目(T201006)
湖北省教育厅科学技术重点项目(D20111902)
恩施州科学技术项目资助
关键词
凹凸棒石
热处理
晶体结构
形貌
attapulgite, heat treatment, crystal structure, morphology
