Abstract Contamination of toxic organic pollutants is a worldwide problem and needs to develop an eco-friendly and highly effective adsorbent material for its removal. Recently, 2D graphene oxide (GO) and graphitic carbon nitride (g-C3N4) is mostly used as an adsorbent for the efficient removal of organic pollutants. Here we have prepared a novel 2D/2D GO/g-C3N4 sheets decorated with Fe3O4 nanoparticles (GO/g–C3N4–Fe3O4) using the hydrothermal method. The structural properties, formation, morphology, and bonding were analyzed by different analytical techniques. Then the obtained GO/g–C3N4–Fe3O4 nanocomposite was used as an adsorbent to eliminate both toxic tetracycline (TC) antibiotic and methylene blue (MB) dye. The adsorption of TC and MB were pH-dependent and maximum adsorption capacity (120 mg/g) was achieved at pH = 3 for TC and (220 mg/g) at pH = 9 for MB. The high adsorption efficiency of GO/g–C3N4–Fe3O4 for TC and MB was mainly due to π-π and hydrogen bonding interaction. The introduction of Fe3O4 nanoparticles onto 2D/2D GO/g-C3N4 not only increases the adsorption capacity but also can make it easily separable from treated water. Adsorption data obtained were best fitted to the Langmuir and pseudo-second-order kinetics model. The adsorbed TC and MB on GO/g–C3N4–Fe3O4 surface were recovered and can be reused up to 5 cycles.

中文翻译：

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Fe3O4 纳米颗粒功能化 GO/g-C3N4 纳米复合材料：一种高效的磁性纳米吸附剂，用于吸附去除有机污染物

摘要 有毒有机污染物的污染是一个世界性问题，需要开发一种环保、高效的吸附材料来去除有毒有机污染物。最近，二维氧化石墨烯 (GO) 和石墨氮化碳 (g-C3N4) 主要用作有效去除有机污染物的吸附剂。在这里，我们使用水热法制备了一种新型 2D/2D GO/g-C3N4 片材，其装饰有 Fe3O4 纳米颗粒（GO/g–C3N4–Fe3O4）。通过不同的分析技术分析了结构特性、形成、形态和键合。然后将获得的 GO/g–C3N4–Fe3O4 纳米复合材料用作吸附剂以消除有毒的四环素 (TC) 抗生素和亚甲蓝 (MB) 染料。TC 和 MB 的吸附取决于 pH 值，TC 在 pH = 3 时达到最大吸附容量 (120 mg/g)，MB 在 pH = 9 时达到 (220 mg/g)。GO/g-C3N4-Fe3O4 对 TC 和 MB 的高吸附效率主要是由于 π-π 和氢键相互作用。将 Fe3O4 纳米颗粒引入到 2D/2D GO/g-C3N4 上不仅增加了吸附能力，而且可以使其易于与处理过的水分离。获得的吸附数据最适合 Langmuir 和伪二级动力学模型。GO/g–C3N4–Fe3O4 表面上吸附的 TC 和 MB 被回收，最多可重复使用 5 个循环。将 Fe3O4 纳米颗粒引入到 2D/2D GO/g-C3N4 上不仅增加了吸附能力，而且可以使其易于与处理过的水分离。获得的吸附数据最适合 Langmuir 和伪二级动力学模型。GO/g–C3N4–Fe3O4 表面上吸附的 TC 和 MB 被回收，最多可重复使用 5 个循环。将 Fe3O4 纳米颗粒引入到 2D/2D GO/g-C3N4 上不仅增加了吸附能力，而且可以使其易于与处理过的水分离。获得的吸附数据最适合 Langmuir 和伪二级动力学模型。GO/g–C3N4–Fe3O4 表面上吸附的 TC 和 MB 被回收，最多可重复使用 5 个循环。