Strategies for the rapid and efficient removal of fluoridated industrial wastewater are currently lacking. Herein, monolayer calcium-doped layered yttrium hydroxide (Ca-Y LRH) was synthesized through formamide exfoliation, and its removal of fluoride reached equilibrium within 4 min. The adsorption kinetics fit the pseudo-second-order kinetic model with a faster adsorption rate (K = 0.22 mg g min), and the adsorption isotherm followed the Langmuir model with a maximum adsorption capacity of 483.33 mg g. The interlayer chloride ions in the monolayer Ca-Y LRH were the main ligands for substituting fluoride, which inhibited the increase in pH and maintained the continuation of the fluoride removal process. Furthermore, the optimum fluoride removal performance of monolayer Ca-Y LRH was predicted by software-based multiparameter methods and was found to be useful for treating fluoridated industrial wastewater samples (858.17 or 8.72 mg L). These findings provide novel insights into the treatment of fluoridated industrial wastewater.

中文翻译：

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单层钙掺杂层状氢氧化钇吸附剂用于快速高效去除工业废水中的氟化物


目前缺乏快速有效去除氟化工业废水的策略。本文通过甲酰胺剥离合成了单层钙掺杂层状氢氧化钇（Ca-Y LRH），其除氟在4分钟内达到平衡。吸附动力学符合准二级动力学模型，具有较快的吸附速率（K=0.22 mg g·min），吸附等温线遵循Langmuir模型，最大吸附量为483.33 mg·g。单层Ca-Y LRH中的层间氯离子是取代氟化物的主要配体，抑制了pH的升高，维持了除氟过程的持续。此外，通过基于软件的多参数方法预测了单层 Ca-Y LRH 的最佳除氟性能，并发现其可用于处理含氟工业废水样品（858.17 或 8.72 mg·L）。这些发现为氟化工业废水的处理提供了新的见解。