Synthetic dyes have complex molecular structures and are stable molecules against oxidizing agents, sunlight, and microbial attack. Therefore, the treatment of dye‐containing wastewater using appropriate techniques is of great importance. Difficulties in separation and recovery of an adsorbent from the solution limit the large‐scale applications of the adsorption process. A magnetic separation technique can be adapted to the adsorption process to overcome these limitations. In this study, a natural mineral‐based magnetic adsorbent is prepared by a co‐precipitation method. Adsorption performance of magnetic montmorillonite (MagMt) is evaluated in both batch and continuous systems as a function of initial pH, contact time, adsorbent dosage, ionic strength, flow rate, and bed depth. MagMt is characterized through infrared (IR) spectroscopy, scanning electron microscopy (SEM), energy dispersive X‐ray analysis (EDX), vibrating sample magnetometer (VSM), X‐ray diffraction (XRD), and zeta potential measurement. Sorption yield of MagMt for Bismark Brown‐Y (BB‐Y) is found as maximum (98.60%) at pH 4 with 40 mg adsorbent. Fast sorption equilibrium is attained within 10 min and the sorption data follow the pseudo‐second‐order kinetic model and Langmuir isotherm model. The maximum monolayer sorption capacity of MagMt is 138.70 mg g^‒1.

中文翻译：

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磁性蒙脱土复合材料对水溶液中重氮染料的吸附

合成染料具有复杂的分子结构，是抵抗氧化剂，日光和微生物侵袭的稳定分子。因此，使用适当的技术处理含染料废水非常重要。从溶液中分离和回收吸附剂的困难限制了吸附过程的大规模应用。磁分离技术可以适应于吸附过程以克服这些限制。在这项研究中，通过共沉淀法制备了基于天然矿物的磁性吸附剂。批处理和连续系统中的磁性蒙脱土（MagMt）的吸附性能均随初始pH，接触时间，吸附剂用量，离子强度，流速和床层深度的函数进行评估。MagMt通过红外（IR）光谱进行表征，扫描电子显微镜（SEM），能量色散X射线分析（EDX），振动样品磁力计（VSM），X射线衍射（XRD）和Zeta电位测量。在40 mg吸附剂下，pH 4时，MagMt对Bismark Brown-Y（BB-Y）的吸附产率最高（98.60％）。在10分钟内达到快速吸附平衡，吸附数据遵循伪二级动力学模型和Langmuir等温模型。MagMt的最大单层吸附能力为138.70 mg g 在10分钟内达到快速吸附平衡，吸附数据遵循伪二级动力学模型和Langmuir等温模型。MagMt的最大单层吸附能力为138.70 mg g 在10分钟内达到快速吸附平衡，吸附数据遵循伪二级动力学模型和Langmuir等温模型。MagMt的最大单层吸附能力为138.70 mg g^‒1。