Graphene oxide (GO) particulates offer an inexpensive route for the formation of graphene flakes. Their fine size and high degree of dispensability in aqueous media have raised environmental safety concerns in processing plants. This manuscript describes a novel electrocoagulation based method that enables the removal of GO particles from acidic aqueous suspensions in the form of copper-ion containing GO films. Specifically, copper ions were generated near a copper anode and adsorbed onto negatively surface-charged GO particles, driving the anodic deposition of GO films. The experimental variables included the type of electric field (DC and AC) and the use of a copper-ion induced bulk pre-coagulation step. A direct current (DC) potential gradient of 3 V/cm applied to a baseline suspension with a GO concentration of 0.8 mass percent solids removed approximately 3% of the GO particles in a minute in the form of compact films of thickness ranging from approximately 10 to 50 microns containing copper ions. Use of AC fields led to lower deposition rates and copper content. On the other hand, pre-coagulation of GO dispersions with copper ions led to films with enhanced copper concentrations. Characterization of GO films using XPS and Raman techniques has shown that copper is present in the bivalent form in GO.

氧化石墨烯（GO）微粒为形成石墨烯薄片提供了廉价的途径。它们的细小尺寸和在水性介质中的高度可分配性引起了加工厂对环境安全的关注。该手稿描述了一种新颖的基于电凝的方法，该方法能够从酸性含水悬浮液中以含铜离子的GO膜形式除去GO颗粒。具体而言，铜离子在铜阳极附近产生并吸附到表面带负电的GO颗粒上，从而驱动GO膜的阳极沉积。实验变量包括电场类型（DC和AC）以及铜离子诱导的本体预凝结步骤的使用。将3 V / cm的直流（DC）电势梯度应用于GO浓度为0的基线悬浮液。8％的固体在一分钟内以厚度约为10至50微米的含铜离子的致密薄膜的形式去除了约3％的GO颗粒。使用交流电场可降低沉积速率和铜含量。另一方面，GO分散体与铜离子的预凝结导致膜中铜浓度增加。使用XPS和拉曼技术对GO薄膜进行表征表明，铜以二价形式存在于GO中。