摘要
以偏高岭土为铝、硅源,以硅酸钾铯溶液为碱激发剂,无需添加任何沸石晶种和表面活性剂,室温制备了钾铯基地聚合物前驱体。将所制备钾铯基地聚合物前驱体在密闭蒸压反应釜环境中(180℃,0.8 MPa)水热晶化8h,制备得到了块体铯榴石。研究结果表明,钾铯基地聚合物前驱体为无定形物质;经水热晶化处理后,铯含量较高的样品中出现了铯榴石晶体,说明地聚合物凝胶原位转化为铯榴石晶体颗粒。原位转化生成的铯榴石晶体颗粒被地聚合物凝胶包裹和粘结,使得块体材料具有较高抗压强度。
(K ,Cs)-geopolymer precursors have been synthesized by using metakaolin (MK) and potassium cesi-um silicate solutions as raw materials without any zeolites and surfactants. And the bulk pollucite mateials were obtained by the hydrothermal crystallization of (K , Cs)-geopolymer precursors under hydrothermal conditions of 180 °C and 0.8 MPa for 8 h. Results show the amorphous nature of (K , Cs)-geopolymer precursors. And the crystals with pollucite structure in the samples with higher content of Cs indicates the in-situ transformation of (K , Cs)-geopolymer gels under hydrothermal conditions. The in-situ formed pollucite particles could be bonded by non-transformed geopolymer gels to construct the bulk pollucite with high compressive strength.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2017年第7期7045-7049,共5页
Journal of Functional Materials
基金
国家自然科学基金资助项目(51402246)
关键词
地聚合物
水热合成
块体铯榴石
geopolymer
hydrothermal synthesis
bulk pollucite