Water is one of the most important resources for human survival and development. Efficient wastewater treatment techniques such as coagulation, filtration, ozonation, and reverse osmosis have been studied to remove toxic materials from water. Implementation of adsorption columns has been proven to be an efficient wastewater treatment method, particularly for the removal of organic contaminants. In this study, we present the preparation of an eco-friendly graphene oxide–chitosan (GC) composite hydrogel column (GCCHC) and its application as a broad-spectrum adsorbent for wastewater treatment. The GCCHC shows a high removal capacity towards different contaminants including both cationic dyes [methylene blue (MB) and rhodamine B (RhB)] and anionic dyes [methylene orange (MO) and congo red (CR)]. Moreover, the samples can be regenerated and recycled without loss of contaminant removal capacity over successive adsorption and washing cycles.

中文翻译：

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氧化石墨烯-壳聚糖杂化水凝胶去除阳离子和阴离子染料的回收性能

水是人类生存和发展最重要的资源之一。人们已经研究了混凝、过滤、臭氧化和反渗透等高效废水处理技术，以去除水中的有毒物质。吸附塔的实施已被证明是一种有效的废水处理方法，特别是对于有机污染物的去除。在这项研究中，我们介绍了一种环保型氧化石墨烯-壳聚糖（GC）复合水凝胶柱（GCCHC）的制备及其作为废水处理广谱吸附剂的应用。GCCHC 对不同污染物显示出高去除能力，包括阳离子染料 [亚甲基蓝 (MB) 和罗丹明 B (RhB)] 和阴离子染料 [亚甲基橙 (MO) 和刚果红 (CR)]。此外，样品可以再生和循环利用，并且在连续的吸附和洗涤循环中不会损失污染物去除能力。