Abstract The present research was designed to explore the adsorption of sunset yellow (SY) and Nile blue (NB) from water using clay and clay/starch/MnFe2O4 magnetic composite. The magnetic composite was synthesized by chemical precipitation and the physical-chemical characteristics of the adsorbents were evaluated. The specific magnetic saturation values for MnFe2O4 nanoparticles and clay/starch/MnFe2O4 were obtained 31.88emu/g and 10.33emu/g, respectively. In the batch mode experiments, the effect of operational factors was studied. The pseudo-second-order had a better correlation coefficient compared to the pseudo-first-order, Elovich, and intraparticle diffusion models. The Langmuir and Freundlich model fitted the equilibrium data for adsorption of both dyes (SY and NB) using clay and clay/starch/MnFe2O4, respectively. The maximum adsorption capacity for the adsorption of SY and NB dyes using clay was 67.82 mg/g and 72.25 mg/g, respectively and these values increased by about 15% after using the clay/starch/MnFe2O4 composite. The negative value of Gibbs free energy and enthalpy parameters proved that the SY and NB adsorption is spontaneous and exothermic. A sample of textile wastewater was properly treated using adsorbents. Finally, clay and clay/starch/MnFe2O4 magnetic composite can be used as viable adsorbents for dyes removal from water and industrial wastewater.

中文翻译：

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使用天然粘土和粘土/淀粉/MnFe2O4 磁性纳米复合材料从水中吸收阴离子和阳离子染料

摘要 本研究旨在探索利用粘土和粘土/淀粉/MnFe2O4 磁性复合材料从水中吸附日落黄（SY）和尼罗蓝（NB）。通过化学沉淀合成磁性复合材料，并评估了吸附剂的物理化学特性。MnFe2O4 纳米颗粒和粘土/淀粉/MnFe2O4 的比磁饱和值分别为 31.88emu/g 和 10.33emu/g。在批处理模式实验中，研究了操作因素的影响。与伪一阶、Elovich 和粒子内扩散模型相比，伪二阶具有更好的相关系数。Langmuir 和 Freundlich 模型分别拟合了使用粘土和粘土/淀粉/MnFe2O4 吸附两种染料（SY 和 NB）的平衡数据。使用粘土吸附SY和NB染料的最大吸附容量分别为67.82mg/g和72.25mg/g，使用粘土/淀粉/MnFe2O4复合物后，这些值增加了约15%。Gibbs自由能和焓参数的负值证明SY和NB吸附是自发放热的。使用吸附剂对纺织废水样本进行了适当处理。最后，粘土和粘土/淀粉/MnFe2O4 磁性复合材料可用作可行的吸附剂，用于去除水和工业废水中的染料。Gibbs自由能和焓参数的负值证明SY和NB吸附是自发放热的。使用吸附剂对纺织废水样本进行了适当处理。最后，粘土和粘土/淀粉/MnFe2O4 磁性复合材料可用作可行的吸附剂，用于去除水和工业废水中的染料。Gibbs自由能和焓参数的负值证明SY和NB吸附是自发放热的。使用吸附剂对纺织废水样本进行了适当处理。最后，粘土和粘土/淀粉/MnFe2O4 磁性复合材料可用作可行的吸附剂，用于去除水和工业废水中的染料。