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专业: 碳素材料与超硬材料

[交流] 用于高效水处理的3D氧化石墨烯凝胶已有7人参与

Toward 3D graphene oxide gels based adsorbents for high-efficient water treatment via the promotion of biopolymers，Journal of Hazardous Materials 263 (2013) 467-478. 影响因子：4.331
摘要：Recent studies showed that graphene oxide (GO) presented high adsorption capacities to various water contaminants. However, the needed centrifugation after adsorption and the potential biological toxicity of GO restricted its applications in wastewater treatment. In this study, a facile method is provided by using biopolymers to mediate and synthesize 3D GO based gels. The obtained hybrid gels present well-deﬁned and interconnected 3D porous network, which allows the adsorbate molecules to diffuse easily into the adsorbent. The adsorption experiments indicate that the obtained porous GO-biopolymer gels can efﬁciently remove cationic dyes and heavy metal ions from wastewater. Methylene blue (MB) and methyl violet (MV), two cationic dyes, are chosen as model adsorbates to investigate the adsorption capability and desorption ratio; meanwhile, the inﬂuence of contacting time, initial concentration, and pH value on the adsorption capacity of the prepared GO-biopolymer gels are also studied. He GO-biopolymer gels displayed an adsorption capacity as high as 1100 mg/g for MB dye and 1350 mg/g for MV dye, respectively. Furthermore, the adsorption kinetics and isotherms of the MB were studied in details. The experimental data of MB adsorption ﬁtted well with the pseudo-second-order kinetic model and the Langmuir isotherm, and the results indicated that the adsorption process was controlled by the intraparticle diffusion. Moreover, the adsorption data revealed that the porous GO-biopolymer gels showed good selective adsorbability to cationic dyes and metal ions.
中文翻译摘要：最近的研究表明氧化石墨烯具有高的吸附能力对水中多种污染物。然而，吸附后所需的离心分离以及GO潜在的生物毒性限制了它在污水处理领域的应用。在本研究中，通过使用生物聚合物提供了一种温和的方法调节和合成3DGO基凝胶。获得的混合凝胶具有清晰的、连通的3D多孔网络，这使得被吸附的分子容易扩散到吸附剂中。吸附实验表明获得的多孔GO-生物聚合物凝胶可以有效移除废水中的阳离子染料和重金属离子。亚甲基蓝（MB）和甲基紫（MV），两种阳离子染料，作为典型的吸附质来研究吸附容量和解吸附率；同时也研究了接触时间、起始浓度和pH值对制备的GO-生物聚合物凝胶吸附容量的影响。GO-生物聚合物凝胶显示出对MB吸附容量高达1100mg/g，对MV高达1350mg/g。此外，详细研究了MB的吸附动力学和等温线。MB吸附作用的实验数据符合准二级动力学模型和朗格缪尔等温线，结果表明吸附过程通过内部颗粒扩散控制。此外，吸附数据表明多孔的GO-生物聚合物凝胶显示出好的选择吸附性对阳离子染料和金属离子。

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