Abdel-Hady E E, Hafez Sarah H M, Mohamed Hamdy F M, Elsharkawy Mohamed R M
Physics Department, Faculty of Science, Minia University, P.O. Box 61519, Minia, Egypt.
Physics Department, Higher Institute of Engineering Automotive Technology and Energy in New Heliopolis, Cairo, Egypt.
Sci Rep. 2024 Jul 17;14(1):16501. doi: 10.1038/s41598-024-65889-2.
With a rapid increase in industrial growth around the world, the demand for an entirely novel category of nanoparticles and technologies for wastewater treatment has become a key concern for environmental protection. Recently, hybrids of layered double hydroxides (LDH), particularly those containing LDH, have gained attention as potential nanoscale adsorbents for water treatment. Recent research has shown that LDH-containing composites are interesting versatile materials with the ability to be used in energy storage, photocatalysis, nanocomposites, and water treatment. In the current work, LDH-containing composites were utilized as adsorbents for the purpose of purifying water. The adsorbents investigated are Zn-Co-Fe/LDH/Chitosan-in situ sample preparation (LDH/CS1) and Zn-Co-Fe/LDH/Chitosan-ex situ sample preparation (LDH/CS2). Furthermore, LDH/CS1 and LDH/CS2 were investigated for wastewater treatment from methyl orange dye (MO) with various adsorption conditions. When the initial MO concentration was 20 mg/L and the amount of adsorbent was 0.1 g, the removal efficiency reached 72.8 and 91.7% for LDH/CS1 and LDH/CS2, respectively. The MO's maximum adsorption capabilities are 160.78 and 165.89 mg/g for LDH/CS1 and LDH/CS2, respectively, which is much greater than that of comparable commercial adsorbents. MO adsorption onto LDH/CS1 and LDH/CS2 was best characterized by the pseudo-second-order kinetic model. The equilibrium adsorption data was followed by the Freundlich and Langmuir models. The adsorption is favorable as evidenced by the equilibrium parameter R values for MO adsorption onto LDH/CS1 and LDH/CS2, which were 0.227 and 0.144, respectively. Using the free volume distribution method and the positron annihilation lifetime technique, the nanostructure of the materials was examined.
随着全球工业增长的迅速增加，对用于废水处理的全新类别纳米颗粒和技术的需求已成为环境保护的关键关注点。最近，层状双氢氧化物（LDH）的杂化物，特别是那些含有LDH的杂化物，作为潜在的用于水处理的纳米级吸附剂受到了关注。最近的研究表明，含LDH的复合材料是有趣的多功能材料，能够用于能量存储、光催化、纳米复合材料和水处理。在当前工作中，含LDH的复合材料被用作吸附剂以净化水。所研究的吸附剂是原位制备的Zn-Co-Fe/LDH/壳聚糖样品（LDH/CS1）和异位制备的Zn-Co-Fe/LDH/壳聚糖样品（LDH/CS2）。此外，研究了LDH/CS1和LDH/CS2在各种吸附条件下对甲基橙染料（MO）废水的处理效果。当初始MO浓度为20mg/L且吸附剂用量为0.1g时，LDH/CS1和LDH/CS2的去除效率分别达到72.8%和91.7%。LDH/CS1和LDH/CS2对MO的最大吸附容量分别为160.78mg/g和165.89mg/g，远高于同类商业吸附剂。MO在LDH/CS1和LDH/CS2上的吸附最符合准二级动力学模型。平衡吸附数据符合Freundlich和Langmuir模型。MO在LDH/CS1和LDH/CS2上吸附的平衡参数R值分别为0.227和0.144，表明吸附是有利的。使用自由体积分布法和正电子湮没寿命技术对材料的纳米结构进行了研究。
