Zeolite membranes are the focus of much active research due to their extensive potential applications, particularly their superior catalytic and separation properties. Synthesis methods and properties are presented here and compared with those of the zeolite crystalline powders. This review concentrates on composite membranes, the Figure showing the surface of an alumina composite membrane with MOR structure.
In this study, we propose a novel approach to prepare few-layer graphene (FLG) dispersions, which is realized by exfoliating natural graphite flakes in a surfactant aqueous solution under hydrothermal treatment and liquid-phase exfoliation. In order to obtain stable and well-dispersed FLG dispersions, pristine graphite is hydrothermally expanded in a hexadecyltrimethylammonium bromide (CTAB) aqueous solution at 180 °C for 15 h, followed by sonication up to 3 h. In comparison to long-time sonication methods, the present method is significantly efficient, and most importantly, does not involve the use of an oxidizing agent and hazardous media, which will make it more competent in the scalable production of graphene.
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