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Template-free synthesis of kaolin-based mesoporous silica with improved specific surface area by a novel approach
Abstract A novel template-free method is proposed and demonstrated to develop the facile top-down strategy of preparing mesoporous materials from natural minerals. In the process, kaolin was pre-calcined, alkali-activated and finally acid-etched into mesoporous silica (MS) of improved specific surface area (604m2/g) and large pore size (4.41nm) at the maximum probability. The characterizations of XRF, XRD, TG, FT-IR, SEM, TEM and N2 adsorption/desorption were carried out and the material evolution mechanism was clarified. The as-resulted MS showed favorable adsorption ability toward methylene blue with the monolayer adsorption capacity up to 652.9mg/g, indicating its promising potential in adsorption application. The template-free method proposed may benefit not only the clay products but also the wide application of mesoporous materials cost-effectively.
Highlights A template-free process to prepare mesoporous silica (MS) from kaolin was proposed. The simple process consists of calcination, alkali activation and acid etching. MS has an improved S BET of 604m2/g and D BJH of 4.41nm. MS has a high monolayer adsorption capacity of 652.9mg/g on methylene blue.
Template-free synthesis of kaolin-based mesoporous silica with improved specific surface area by a novel approach
Abstract A novel template-free method is proposed and demonstrated to develop the facile top-down strategy of preparing mesoporous materials from natural minerals. In the process, kaolin was pre-calcined, alkali-activated and finally acid-etched into mesoporous silica (MS) of improved specific surface area (604m2/g) and large pore size (4.41nm) at the maximum probability. The characterizations of XRF, XRD, TG, FT-IR, SEM, TEM and N2 adsorption/desorption were carried out and the material evolution mechanism was clarified. The as-resulted MS showed favorable adsorption ability toward methylene blue with the monolayer adsorption capacity up to 652.9mg/g, indicating its promising potential in adsorption application. The template-free method proposed may benefit not only the clay products but also the wide application of mesoporous materials cost-effectively.
Highlights A template-free process to prepare mesoporous silica (MS) from kaolin was proposed. The simple process consists of calcination, alkali activation and acid etching. MS has an improved S BET of 604m2/g and D BJH of 4.41nm. MS has a high monolayer adsorption capacity of 652.9mg/g on methylene blue.
Template-free synthesis of kaolin-based mesoporous silica with improved specific surface area by a novel approach
Li, Tiantian (Autor:in) / Shu, Zhu (Autor:in) / Zhou, Jun (Autor:in) / Chen, Yun (Autor:in) / Yu, Dongxue (Autor:in) / Yuan, Ximing (Autor:in) / Wang, Yanxin (Autor:in)
Applied Clay Science ; 107 ; 182-187
23.01.2015
6 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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