A magnetic mesoporous carbon (MC) with high functionality was fabricated by direct thermolysis and carbonization of bimetallic metal–organic frameworks (M/Fe–MOF, where M = La or Zr). The as-prepared materials such as La–Fe@MC and Zr–Fe@MC displayed excellent adsorption performance towards the removal of arsenite and arsenate ions in an aqueous solution. The physicochemical properties of prepared adsorbents before and after adsorption were characterized by using various analytical techniques. Various influencing parameters such as contact time, solution pH, co-existing anion, and regeneration experiments were analyzed to determine the maximum adsorption capacity for both arsenic species using the as-synthesized adsorbents. The La–Fe@MC composite showed a higher adsorption capacity for both contaminants when compared to Zr–Fe@MC composite and the maximum monolayer adsorption capacity of As(III) and As(V) ions were 116.25 and 166.67 mg/g for La–Fe@MC and 109.89 and 144.93 mg/g for Zr-Fe@MC, respectively. The Langmuir isotherm and pseudo-second-order kinetic models were the optimum fit for As(III) and As(V) species adsorption on both the adsorbents. The magnetic La–Fe@MC and Zr–Fe@MC materials exhibited excellent reusability even after five adsorption cycles. This study provides significant insights into the development of promising candidates for eliminating As(III) and As(V) ions from aqueous solutions.

中文翻译：

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磁性介孔碳作为优异的吸附材料用于水环境中的砷去除

通过双金属金属有机骨架（M/Fe-MOF，其中M = La或Zr）的直接热解和碳化制备了具有高功能性的磁性介孔碳（MC）。所制备的材料如La-Fe@MC和Zr-Fe@MC对于去除水溶液中的亚砷酸根和砷酸根离子表现出优异的吸附性能。通过使用各种分析技术来表征所制备的吸附剂在吸附前后的物理化学性质。分析了各种影响参数，如接触时间、溶液 pH 值、共存阴离子和再生实验，以确定使用合成吸附剂对两种砷物质的最大吸附容量。与 Zr-Fe@MC 复合材料相比，La-Fe@MC 复合材料对两种污染物均表现出更高的吸附容量，并且对 La 的 As(III) 和 As(V) 离子的最大单层吸附容量分别为 116.25 和 166.67 mg/g。 –Fe@MC，Zr-Fe@MC 分别为 109.89 和 144.93 mg/g。Langmuir 等温线和伪二级动力学模型最适合两种吸附剂上 As(III) 和 As(V) 物质的吸附。磁性La-Fe@MC和Zr-Fe@MC材料即使在五个吸附周期后也表现出优异的可重复使用性。这项研究为开发从水溶液中消除 As(III) 和 As(V) 离子的有前途的候选药物提供了重要见解。