The purification process of graphene oxide (GO) is a key stage in the production of this two-dimensional material by the Hummers method. This step demands a large amount of water, energy and time. The inefficient removal of the contaminants present in GO may affect its properties and make it unfeasible for some applications, such as in the field of biology. Here, we develop a simple and efficient method for the purification of an aqueous GO dispersion based on a fluidic diffusion cell system with a porous nitrocellulose membrane. The effectiveness of the fluidic diffusion cell system was compared with that of traditional purification methods, such as dialysis and centrifugation. The proposed strategy achieves the best performance in the removal of the major contaminants (K_(aq.)⁺, Na_(aq.)⁺, Cl_(aq.)⁻, SO_4(aq.)²⁻, Mn_(aq.)²⁺ and MnO_2(s)), demanding ∼95% less water than dialysis and in a shorter time (∼23 h). The system operates under flow conditions, with minimum handling by the operator and is able to select the GO flakes with bigger lateral dimensions. This work represents a simple and fast alternative for purification of GO dispersions that can be easily scaled-up.

中文翻译：

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通过使用流体池纯化氧化石墨烯分散体。

氧化石墨烯（GO）的纯化过程是通过Hummers方法生产这种二维材料的关键阶段。该步骤需要大量的水，能量和时间。GO中存在的污染物的去除效率不高可能会影响其特性，并使其不适用于某些应用，例如生物学领域。在这里，我们开发了一种简单而有效的方法，用于基于带有多孔硝化纤维素膜的流体扩散池系统纯化GO水性分散液。将流体扩散池系统的有效性与传统的纯化方法（如透析和离心分离）进行了比较。建议的策略在去除主要污染物（K _（aq。）⁺，Na_（aq。）⁺，Cl_（aq。）^-，SO _4（aq。）²⁻，Mn_（aq。）²⁺和MnO _2（s），比透析所需的水少约95％，而且时间更短（〜23小时）。该系统在流量条件下运行，操作员只需进行最少的操作即可选择较大侧向尺寸的GO薄片。这项工作代表了可以轻松按比例放大的GO分散体纯化的简单快速替代方案。