ABSTRACT A nanocomposite of activated carbon (AC) and graphene oxide (GO) has been used as adsorbent of methylene blue (MB) dye from solution. FTIR spectroscopy, XRD, SEM imaging, size and zeta potential analysis of the nanocomposite material indicate retention of the essential features of both the components responsible for adsorption. Parameters like pH, temperature, adsorbent and salt concentrations, etc. were varied to optimize the adsorption. A very significant increase in adsorption by this nanocomposite, compared to those arising from the individual components, could be observed, resulting in an adsorption capacity of up to 1000 mg/gm. Fit of the data to kinetic equations gave rate constants for the process. Good fits to both Langmuir and Freundlisch isotherms indicated that the contribution of electrostatic attraction between the charged groups present in the composite and dye molecules, as well as the adsorption through AC surface pores both play significant roles. The synergy of these two different mechanisms yields the extraordinarily large adsorption capacity. This factor, together with the cheapness of the material, and its selectivity towards cationic dyes suggest its practical importance for water decontamination.

中文翻译：

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活性炭-氧化石墨烯纳米复合材料高效选择性吸附阳离子染料的设计：机理及协同作用研究

摘要活​​性炭 (AC) 和氧化石墨烯 (GO) 的纳米复合材料已被用作溶液中亚甲蓝 (MB) 染料的吸附剂。纳米复合材料的 FTIR 光谱、XRD、SEM 成像、尺寸和 zeta 电位分析表明，保留了负责吸附的两种组分的基本特征。改变 pH、温度、吸附剂和盐浓度等参数以优化吸附。可以观察到，与单个组分产生的吸附量相比，这种纳米复合材料的吸附量显着增加，导致吸附容量高达 1000 毫克/克。数据与动力学方程的拟合给出了该过程的速率常数。Langmuir 和 Freundlisch 等温线的良好拟合表明复合材料和染料分子中存在的带电基团之间的静电吸引力的贡献以及通过 AC 表面孔的吸附都起着重要作用。这两种不同机制的协同作用产生了非常大的吸附容量。这个因素，连同材料的便宜，以及它对阳离子染料的选择性，表明它在水净化方面的实际重要性。