Activated carbon/bentonite/magnetite nanobiocomposite was used to remove Cr(VI) ions from water. The physical properties of the nanocomposite were characterized by various spectroscopic analyses. The specific surface area of the nanocomposite was 337.96 m²g⁻¹, which is a significant value. The maximum uptake efficiency and maximum uptake capacity of the adsorbent were 98 % and 29.32 mg g⁻¹, respectively, which are also considerable values. The maximum uptake efficiency was obtained at pH 9, after 80 min, at a nanocomposite dosage of 2 g L⁻¹, an ion concentration of 5 mg L⁻¹, and a temperature of 25 °C. The thermodynamic study indicated that the sorption process was spontaneous and exothermic. The nanocomposite reusability study after six cycles of reuse demonstrated that the bionanocomposite can be used for up to three cycles without significant change in its uptake efficiency.

中文翻译：

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活性炭/膨润土/Fe3O4 作为新型纳米生物复合材料用于高去除 Cr(VI) 离子

活性炭/膨润土/磁铁矿纳米生物复合材料用于去除水中的 Cr(VI) 离子。通过各种光谱分析表征纳米复合材料的物理性质。纳米复合材料的比表面积为337.96m ² g ^-1，这是一个显着的值。吸附剂的最大吸收效率和最大吸收容量分别为 98% 和 29.32 mg g ^-1，这也是相当可观的值。在 pH 9、80 分钟后、纳米复合材料剂量为 2 g L ^-1、离子浓度为 5 mg L ^-1时获得最大吸收效率, 和 25 °C 的温度。热力学研究表明吸附过程是自发和放热的。六次重复使用后的纳米复合材料可重复使用性研究表明，生物纳米复合材料最多可以使用三个循环，而其吸收效率没有显着变化。