Al-Gaashani Rashad, Alyasi Haya, Karamshahi Fatima, Simson Simjo, Tongb Yongfeng, Kochkodan Viktor, Lawler Jenny
Qatar Environment and Energy Research Institute (QEERI), Hamad Bin Khalifa University (HBKU), Qatar Foundation, Doha, 34110, Qatar.
Department of Chemistry and Earth Sciences, College of Arts and Sciences, Qatar University, Doha, 2713, Qatar.
Sci Rep. 2024 Dec 28;14(1):30954. doi: 10.1038/s41598-024-81947-1.
This study aims to modify raw zeolite with metal oxide nanocomposites to remove nickel (Ni) ions from synthetic wastewater. Novel zeolite-doped magnesium oxide (MgO), iron oxide (FeO), and zinc oxide (ZnO) nanocomposites were synthesized by hydrothermal-calcination methods. The novel zeolite-doped metal oxide nanocomposites were used as adsorbents to remove Ni (II) ions from synthetic wastewater. Several advanced techniques, including X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and vibrating sample magnetometer (VSM) were applied to study the structural, morphological, chemical, and magnetic properties of the prepared materials. Doped zeolite with ZnO, MgO, and FeO significantly enhances the removal of Ni (II) ions from synthetic wastewater. The zeolite-doped MgO + FeO + ZnO sample achieved a Ni (II) ions removal efficiency of 99.6%, compared to 58.9% for raw zeolites. The removal efficiencies of Ni (II) ions (Ci = 30 mg/L) from highest to lowest were 99.56%, 99.53%, 91.4%, 67.8%, and 58.93% by zeolite-doped MgO + FeO + ZnO, zeolite-doped MgO, zeolite-doped ZnO, zeolite-doped FeO, and raw zeolite sample, respectively. The highest adsorption capacity was 17.13 mg/g of zeolite-doped MgO + FeO + ZnO samples. The experimental adsorption data collected were fitted using five isotherm models, and four kinetic models. The Langmuir adsorption isotherm model and the pseudo-second-order kinetic model provided the best fit for the experimental adsorption data. This suggests that the adsorption process is complex, possibly involving electron interactions between the active sites of doped zeolite and Ni (II) species. The obtained data indicates that zeolite-doped with MgO, FeO and ZnO notably enhances the adsorptive properties of Ni (II) from synthetic wastewater. The obtained thermodynamic values confirmed that the adsorption process is spontaneous and endothermic, with increased randomness at the solid-solution interface during the adsorption process.
本研究旨在用金属氧化物纳米复合材料对天然沸石进行改性，以去除合成废水中的镍（Ni）离子。通过水热煅烧法合成了新型沸石掺杂氧化镁（MgO）、氧化铁（FeO）和氧化锌（ZnO）纳米复合材料。将新型沸石掺杂金属氧化物纳米复合材料用作吸附剂，以去除合成废水中的Ni（II）离子。采用了几种先进技术，包括X射线衍射（XRD）、透射电子显微镜（TEM）、扫描电子显微镜（SEM）、能量色散X射线光谱（EDS）、X射线光电子能谱（XPS）和振动样品磁强计（VSM），来研究制备材料的结构、形态、化学和磁性性能。掺杂ZnO、MgO和FeO的沸石显著提高了合成废水中Ni（II）离子的去除率。沸石掺杂MgO+FeO+ZnO样品对Ni（II）离子的去除效率达到99.6%，而天然沸石的去除效率为58.9%。沸石掺杂MgO+FeO+ZnO、沸石掺杂MgO、沸石掺杂ZnO、沸石掺杂FeO和天然沸石样品对Ni（II）离子（Ci = 30 mg/L）的去除效率从高到低分别为99.56%、99.53%、91.4%、67.8%和58.93%。最高吸附容量为沸石掺杂MgO+FeO+ZnO样品的17.13 mg/g。使用五种等温线模型和四种动力学模型对收集的实验吸附数据进行拟合。Langmuir吸附等温线模型和伪二级动力学模型对实验吸附数据的拟合效果最佳。这表明吸附过程很复杂，可能涉及掺杂沸石的活性位点与Ni（II）物种之间的电子相互作用。所得数据表明，掺杂MgO、FeO和ZnO的沸石显著提高了从合成废水中吸附Ni（II）的性能。所得热力学值证实，吸附过程是自发的且吸热的，在吸附过程中固液界面的随机性增加。
