Hydrothermal synthesis of porous materials from sepiolite
Hydrothermal synthesis of porous materials from sepiolite
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DOI：
10.1007/s11164-011-0284-0
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发表时间：
2011-02
影响因子：
3.3
通讯作者：
Zhenlong Wang;Z. Jing;Keru Wu;Lei Zhou;Jian-Ming Yu;Zhi-Shen Li;E. H. Ishida
中科院分区：
文献类型：
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作者：
Zhenlong Wang;Z. Jing;Keru Wu;Lei Zhou;Jian-Ming Yu;Zhi-Shen Li;E. H. Ishida
为了使海泡石制备出坚韧的多孔材料，同时保持海泡石的固有性能，在饱和蒸汽压力473 K下，通过混合熟石灰进行了长达24 h的水热实验。实验结果表明，熟石灰的加入对强度的发展有积极的影响，强度的增强是由于托贝莫来石和水化硅酸钙（CSH）的凝胶形成。固化时间似乎决定了强度的发展。海泡石的细粒度提高了其在水热过程中的活性，从而使合成的样品具有更高的强度和更快的硬化速率。酸活化对强度的发展也有有益的影响。在酸活化和不酸活化下，合成试样的硬化机制不同。酸活化海泡石的强度增强主要是由于CSH凝胶的形成，而不是由于未酸活化的托贝莫来石的形成。
In order not only to manufacture a tough porous material from sepiolite but also to sustain the inherent properties of the sepiolite, a hydrothermal experiment was carried out under saturated steam pressure at 473 K for up to 24 h by mixing slaked lime. The experimental results show that the addition of slaked lime exerts a positive effect on the strength development, and the strength enhancement is found to be due to tobermorite and calcium silicate hydrate (CSH) gel formation. Curing time seems to condition the strength development. A fine particle size of sepiolite improves its activity during the hydrothermal process, thus offering a higher strength and quicker hardening rate of the synthesized specimen. The acid activation also has a beneficial effect on the strength development. The hardening mechanism of the synthesized specimen is different between the specimens synthesized with or without acid activation. The strength enhancement for sepiolite with acid activating is due mainly to CSH gel formation, instead of tobermorite formation without acid activation.