A novel nanocomposite of sodium montmorillonite with L-Histidine (His-Mt), was prepared to remove Pb(II) and Cu(II) from aqueous media. The resulting nanocomposites were characterized by XRD, FT-IR, BET, SEM, TG/DTG, XPS techniques. All characterizations confirmed the anchoring of L-Histidine to Na-Mt, and the packing sequence of His in the interlayer gallery may form a monolayer structure. The His salt obtained a skewed orientation compared to the silicate surface. The single/ co-adsorption of Cu(II) and Pb(II) by pure and modified i.e. Na-Mt and His-Mt were carried out by batch adsorption experiments. The maximum adsorption capacity (q_max) of Pb(II) and Cu(II) by Na-Mt and modified His-Mt was 89.08 mg/g, 23.93 mg/g, and 107.73 mg/g, 30.72 mg/g, correspondingly. The pseudo-second-order model (kinetic model) and Langmuir model (isotherm model) well-matched with the adsorption process. The data analysis showed it was an endothermic, favorable and spontaneous process, Cu(II) and Pb(II) showed competitive adsorption in the co-adsorption system. Na-Mt adsorbed M(II) ions by ion exchange mechanism, while M(II) formed complexes with histidine and were adsorbed in the interlayer region or the surface of His-Mt.

制备了一种新型的蒙脱土钠与L-组氨酸（His-Mt）的纳米复合材料，用于从水性介质中去除Pb（II）和Cu（II）。通过XRD，FT-IR，BET，SEM，TG / DTG，XPS技术对所得纳米复合材料进行表征。所有特征都证实了L-组氨酸锚定在Na-Mt上，His在层间通道中的堆积顺序可能形成单层结构。与硅酸盐表面相比，His盐具有偏斜的取向。通过分批吸附实验对Cu（II）和Pb（II）进行纯净或修饰的Na-Mt和His-Mt单一/共吸附。最大吸附量（q _maxNa-Mt和修饰的His-Mt对Pb（II）和Cu（II）的吸附量分别为89.08 mg / g，23.93 mg / g和107.73 mg / g，30.72 mg / g。伪二级模型（动力学模型）和Langmuir模型（等温模型）与吸附过程完全匹配。数据分析表明这是一个吸热，有利和自发的过程，Cu（II）和Pb（II）在共吸附体系中表现出竞争性吸附。Na-Mt通过离子交换机制吸附M（II）离子，而M（II）与组氨酸形成络合物，并被吸附在His-Mt的夹层区域或表面。