机械研磨高岭石的固体~(29)Si、~(27)Al核磁共振光谱研究
The ~(29)Si and ~(27)Al MAS NMR Spectroscopy Study of Mechanically Ground Kaolinite
查看参考文献33篇
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文摘
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综合多种测试方法,考察了研磨对茂名高岭石粒径、形貌与微结构等理化性质的影响。重点采用~(29)Si、~(27)Al MAS NMR光谱考察了研磨过程中结构脱羟、Si、Al配位环境变化、新活性位点形成等微结构演变等。结果表明:研磨初期,高岭石六方片层遭到破碎,颗粒粒径逐渐减小,比表面积在研磨1 h达到最大(43.8 m~2/g);此后,颗粒发生团聚,比表面积减小,样品脱羟量和表面吸附水含量均逐渐增加。核磁Si谱和Al谱分别在化学位移–100.5和14.8处出现新的信号,归属于四面体Si与八面体Al相连顶氧质子化作用而产生的Q~3 Si–OH~+–Al结构。研磨导致高岭石脱羟,Al配位状态从Al~Ⅵ经由Al~Ⅴ逐渐向Al~Ⅳ转变。 |
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其他语种文摘
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Effects of mechanical grinding on the physicochemical properties of Maoming kaolinite, including particle size distribution, morphology, microstructure etc.were investigated. Furthermore, ~(29)Si and ~(27)Al MAS NMR spectroscopy were adopted to investigate the dehydroxylation process, the Si and Al coordination environments, the new sites formed during grinding treatment etc. The characterization results show that the hexagonal layer of kaolinite was crushed quickly in the first grinding stage, companied with the decrease of particle sizes and the increase of specific surface area until reached the maximum value (43.8 m~2/g) in 1 h. Further grinding produced spheroidal aggregation of fine particles, and caused the decrease of the specific surface area. Grinding led to extensive dehydroxylationand the adsorption water content increase. New signals at –100.5 ppm and 14.8 ppm ~(29)Si NMR and~(27)Al NMR spectra, respectively, were attributed to a Q~3 Si–OH~+–Al structure formed via protonation of the top oxygen interconnected between tetrahedral Si and octahedral Al. Grinding led to a dehydroxylation of kaolinite, whose Al~Ⅵ (5.8 ppm) gradually transform to Al~Ⅳ (56.5 ppm) via a Al~Ⅴ (31.2 ppm) transition structure. |
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来源
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矿物学报
,2017,37(6):677-683 【核心库】
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DOI
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10.16461/j.cnki.1000-4734.2017.06.001
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关键词
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高岭石
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机械研磨
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四面体片
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八面体片
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固体核磁光谱
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地址
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广州地球化学研究所, 中国科学院矿物学与成矿学重点实验室;;广东省矿物物理与材料研究开发重点实验室, 广东, 广州, 510640
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-4734 |
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学科
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地质学 |
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基金
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国家自然科学基金项目
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广东特支计划青年拔尖人才基金项目
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文献收藏号
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CSCD:6202243
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