The molecular level control of three-dimensional graphene oxide hydrogel structure by using various diamines
The molecular level control of three-dimensional graphene oxide hydrogel structure by using various diamines
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DOI：
10.1016/j.cej.2014.01.105
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发表时间：
2014-06-15
影响因子：
15.1
通讯作者：
Hur, Seung Hyun
中科院分区：
文献类型：
--
作者：
Van Hoang Luan;Chung, Jin Suk;Hur, Seung Hyun
用邻苯二胺(OPDA)和对苯二胺(PPDA)两种不同的二胺实现了氧化石墨烯水凝胶(GOH5)的可控和共价交联的三维网络。由于氧化石墨烯(GO)片上的二胺和羧酸发生缩合反应，在GO片之间形成了酰胺键。由于较长的胺基距离，PPDA-GOH的比表面积和孔容是OPDA-GOH的两倍。与脂肪胺水凝胶相比，芳香胺水凝胶的机械强度有所提高，这是因为酰胺键之间存在一个芳香环。利用PPDA构建了高度发达的三维GoH网络，有助于在不同pH条件下去除水溶液中的有机染料，如亚甲基蓝。在重复吸附试验中也显示出更好的再生能力。(C)2014爱思唯尔B.V.保留所有权利。
The well-controlled and covalently cross-linked three-dimensional networks of graphene oxide hydrogels (GOH5) are realized by using two different diamines, such as o-phenylene diamine (oPDA) and p-phenylene diamine (pPDA). Amide linkages are formed between two graphene oxide (GO) sheets due to the condensation reaction between diamines and carboxylic acids on the GO sheets. The surface area and pore volume of pPDA-GOH are twice the size of those of oPDA-GOH due to the longer amineto-amine distance. Aromatic amine-based hydrogels exhibit enhanced mechanical strength compared to that of aliphatic amine due to the presence of an aromatic ring between amide linkages. Highly-developed 3D networks of GOH fabricated by using pPDA facilitate the removal of organic dye such as methylene blue in aqueous solutions at various pH conditions. It also shows improved regeneration ability in repeated adsorption tests. (C) 2014 Elsevier B.V. All rights reserved.