Abstract The synthesis and investigation of reduced graphene oxide (Gr), graphene oxide (GO) and their magnetite composites (MGr and MGO), as sorbents for the adsorptive removal of estriol, was carried out. The nanosorbents were characterized and the factors that can affect the adsorption, such as pH, temperature and the presence of salts and humic acids were studied. The results showed that the adsorption capacities obtained from the Langmuir isotherms for Gr, GO, MGr and MGO were 200, 22, 23 and 33 mg g −1 of sorbent, respectively, at 25 °C. The adsorption processes were dependent on the pH and on the presence of salts and humic acids, to certain degrees. The thermodynamic parameters indicate that the processes are spontaneous and exothermic in nature. The estriol adsorption mechanism was mainly attributed to π- and hydrogen-bond interactions. Overall, the results demonstrated that all nanosorbents studied are efficient for the removal of estriol. In addition, a heterogeneous Fenton-like reaction catalyzed by MGO took place for the degradation of estriol. The effects of H 2 O 2 concentration and catalyst amount on the degradation of estriol were investigated. A plausible mechanism for the degradation, which is completed in less than 2 h, was put forward. The heterogeneous Fenton reaction catalyzed by MGO is promising for estriol degradation as it leads to non-toxic products based on a zebrafish larvae toxicity study. Graphic Abstract Adsorption study of estriol on graphene-based magnetic and non-magnetic materials. The adsorption process was characterized by kinetic, isotherm and thermodynamic analysis. The maximum adsorption capacity of estriol on graphene was 200 mg/g. Estriol worked satisfactory in the presence of salts and humic acids. Magnetic graphene oxide can serve as heterogeneous Fenton-like catalyst for degradation of estriol.

中文翻译：

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使用石墨烯基材料及其磁铁矿复合材料从水中吸附去除雌三醇：磁铁矿/氧化石墨烯的非均相类芬顿无毒降解

摘要 合成和研究了还原氧化石墨烯 (Gr)、氧化石墨烯 (GO) 及其磁铁矿复合材料 (MGr 和 MGO) 作为吸附去除雌三醇的吸附剂。对纳米吸附剂进行了表征，并研究了影响吸附的因素，如 pH 值、温度以及盐和腐殖酸的存在。结果表明，从兰缪尔等温线获得的对 Gr、GO、MGr 和 MGO 的吸附容量在 25°C 下分别为 200、22、23 和 33 mg g -1 的吸附剂。吸附过程在一定程度上取决于 pH 值以及盐和腐殖酸的存在。热力学参数表明该过程本质上是自发的和放热的。雌三醇吸附机制主要归因于 π 键和氢键相互作用。总体而言，结果表明研究的所有纳米吸附剂均能有效去除雌三醇。此外，发生了由 MGO 催化的异质类芬顿反应以降解雌三醇。研究了H 2 O 2 浓度和催化剂用量对雌三醇降解的影响。提出了一种在不到 2 小时内完成的合理降解机制。由 MGO 催化的异质芬顿反应有望用于雌三醇降解，因为它会产生基于斑马鱼幼虫毒性研究的无毒产物。图形摘要 雌三醇在石墨烯基磁性和非磁性材料上的吸附研究。通过动力学、等温线和热力学分析表征了吸附过程。雌三醇在石墨烯上的最大吸附容量为 200 mg/g。雌三醇在盐和腐殖酸的存在下工作令人满意。磁性氧化石墨烯可作为多相类芬顿催化剂降解雌三醇。