A novel functional rGO aerogel was synthesized by a facile hydrothermal method. In this process, graphene oxide (GO) was used as the precursor and oxidant to synthesize the aerogels. Ethylenediaminetetraacetic acid disodium salt (EDTA-2Na) and pyrrole monomer (reducing agent) were selected to use as hole scavenger and nitrogen sources. The obtained EDTA-2Na/polypyrrole (Ppy)/rGO aerogel (EPGA) has a high adsorption capacity for Cr(VI) anions, and the maximum adsorption capacity reached 361 mg/g at 298 K at pH of 2. In addition, EPGA exhibited a good ability to selectively remove Cr(VI) anions under the effect of coexisting ions (Cl-, NO3-, SO42-, PO43-, Ni+, Cu2+, Zn2+, and Cd2+) and good regeneration ability. The kinetics process and adsorption isotherm can be fitted well with the pseudo-second-order kinetic model and Freundlich isotherm model, respectively. The removal mechanism involved electrostatic interaction, reduction, ion exchange, and chelation process. This work provides a simple and environmentally friendly synthetic route for EPGA, which will be a potential candidate for efficient removal Cr(VI) anions from industrial wastewater.

中文翻译：

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功能性rGO气凝胶可作为潜在的吸附剂去除有害的六价铬：吸附性能和机理。

通过简便的水热法合成了一种新型的功能性rGO气凝胶。在此过程中，使用氧化石墨烯（GO）作为前体和氧化剂来合成气凝胶。选择乙二胺四乙酸二钠盐（EDTA-2Na）和吡咯单体（还原剂）作为空穴清除剂和氮源。所得EDTA-2Na /聚吡咯（Ppy）/ rGO气凝胶（EPGA）对Cr（VI）阴离子的吸附能力强，在298 K，pH 2时最大吸附能力达到361 mg / g。在共存离子（Cl-，NO3-，SO42-，PO43-，Ni +，Cu2 +，Zn2 +和Cd2 +）的作用下，具有良好的选择性去除Cr（VI）阴离子的能力和良好的再生能力。动力学过程和吸附等温线可以很好地拟合拟二阶动力学模型和Freundlich等温线模型，分别。去除机理涉及静电相互作用，还原，离子交换和螯合过程。这项工作为EPGA提供了一种简单且环保的合成路线，这将是从工业废水中有效去除Cr（VI）阴离子的潜在候选人。