Abstract Graphene oxide-supported nano zero-valent iron (GO/nZVI) composites were successfully synthesized using a self-assembly method then characterized by various techniques. The results indicate that nZVI can be uniformly dispersed on the flat surface of GO and immersed into the wrinkles of GO, and both the defects structure, specific surface area and pore volume of GO/nZVI increased relative to those of GO and nZVI. These structure changes improve the reactivity of nZVI and adsorption capacity of GO, and alter the adsorption sites. The ability of GO/nZVI to remove atrazine was investigated by batch experiments according to various parameters. It was found that GO/nZVI can significantly increase the removal efficiency of atrazine compared to the pristine GO and nZVI and a synergetic effect occurred between GO and nZVI for atrazine removal. A combination of atrazine adsorption by GO and atrazine reduction by nZVI on GO/nZVI was proposed as the mechanism of atrazine removal, among the adsorption was the major process governed by π-π stacking of wrinkles, pore-filling of mesopores, and π-π EDA of GO defect sites. The results also suggested that GO/nZVI exhibited high reactivity under a wide pH range due to the mutual balancing effect between reduction and adsorption. In addition, GO/nZVI was easily separated from water and exhibited good stability. Therefore, GO/nZVI composites can be suitable as excellent materials for the treatment of contaminated water.

中文翻译：

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氧化石墨烯负载的纳米零价铁复合材料用于去除水溶液中的莠去津

摘要 采用自组装方法成功合成了氧化石墨烯负载的纳米零价铁 (GO/nZVI) 复合材料，然后通过各种技术对其进行表征。结果表明，nZVI 可以均匀地分散在 GO 的平坦表面上并浸入 GO 的皱纹中，并且 GO/nZVI 的缺陷结构、比表面积和孔体积均相对于 GO 和 nZVI 增加。这些结构变化提高了 nZVI 的反应性和 GO 的吸附能力，并改变了吸附位点。GO/nZVI 去除莠去津的能力通过批量实验根据各种参数进行研究。结果表明，与原始 GO 和 nZVI 相比，GO/nZVI 可以显着提高莠去津的去除效率，并且 GO 和 nZVI 对莠去津的去除产生协同效应。提出了 GO 吸附阿特拉津和 nZVI 在 GO/nZVI 上还原阿特拉津的组合作为去除阿特拉津的机制，其中吸附是由皱纹的 π-π 堆积、中孔的孔隙填充和 π- 控制的主要过程。 GO 缺陷位点的 π EDA。结果还表明，由于还原和吸附之间的相互平衡作用，GO/nZVI 在较宽的 pH 范围内表现出高反应性。此外，GO/nZVI 易于与水分离并表现出良好的稳定性。因此，GO/nZVI 复合材料可作为处理污染水的优良材料。中孔的孔隙填充和 GO 缺陷位点的 π-π EDA。结果还表明，由于还原和吸附之间的相互平衡作用，GO/nZVI 在较宽的 pH 范围内表现出高反应性。此外，GO/nZVI 易于与水分离并表现出良好的稳定性。因此，GO/nZVI 复合材料可作为处理污染水的优良材料。中孔的孔隙填充和 GO 缺陷位点的 π-π EDA。结果还表明，由于还原和吸附之间的相互平衡作用，GO/nZVI 在较宽的 pH 范围内表现出高反应性。此外，GO/nZVI 易于与水分离并表现出良好的稳定性。因此，GO/nZVI 复合材料可作为处理污染水的优良材料。