Highly Porous Core鈥揝hell Structured Graphene-Chitosan Beads

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• 作者：An Ouyang ; Chunhui Wang ; Shiting Wu ; Enzheng Shi ; Wenqi Zhao ; Anyuan Cao ; Dehai Wu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：July 8, 2015
• 年：2015
• 卷：7
• 期：26
• 页码：14439-14445
• 全文大小：520K
• ISSN：1944-8252

文摘

Graphene oxide (GO) sheets have been assembled into various three-dimensional porous structures and composites, with potential applications in energy and environmental areas. Here, we show the combination of GO and chitosan (CTS) into inorganic鈥搊rganic heterocomposites as 鈭? mm diameter core鈥搒hell beads with controlled microstructure. The spherical GO-CTS beads, made by a two-step freeze-casting method, consist of a GO core wrapped by a CTS shell with abrupt interface; both parts have high porosities (94鈥?6%) and mesopores volume (0.246 cm³/g) yet with different pore morphologies. Incorporation of a GO core into the CTS beads significantly improved the methyl orange adsorption capacity (353 mg/g at 318 K) compared with pure CTS beads. Key factors such as the pH value, adsorbent dosage, concentration, time, and temperature have been studied in detail, whereas adsorption isotherm and kinetic studies reveal a Langmuir model following the pseudo-second order.