Alterary Seham S
Department of Chemistry, College of Science, King Saud University, P.O. Box 22452, Riyadh 11495, Saudi Arabia.
ACS Omega. 2024 May 23;9(22):23220-23240. doi: 10.1021/acsomega.3c09076. eCollection 2024 Jun 4.
In the present work, an extract of leaves was used to synthesize an alumina/NiO nanocomposite by the coprecipitation method. First, the shape and surface content of the synthesized adsorbent were determined. Scanning electron microscopy images showed the production of nanospheres and nanorods with sizes between 35 and 50 nm. X-ray diffraction measurement revealed strong, high-intensity peaks, confirming the preparation of a highly crystalline alumina/nickel oxide nanocomposite. Then, the pure nanoalumina, nickel oxide, and functionalized alumina/nickel oxide nanocomposite for water defluoridation were investigated under various conditions, for example, stirring period, pH, and initial fluoride concentration. Defluoridation with greener alumina, nickel oxide, and alumina/nickel oxide nanocomposite lasted 120 min at adsorbent dosages of 0.8 g/L in a pH 7 solution. The adoption process for the three sorbents matches the Langmuir adsorption isotherm. The process dynamics were explored using pseudo-second-order and first-order kinetics. The water quality after treatment met drinking water requirements, proving the viability of using nanoparticles for drinking water defluoridation. This work confirmed effective water defluoridation in the crystalline phase using synthesized nanoalumina, nickel oxide, and their nanocomposite, which highlights their importance for future drinking water defluoridation.
在本工作中，采用叶片提取物通过共沉淀法合成了氧化铝/氧化镍纳米复合材料。首先，测定了合成吸附剂的形状和表面含量。扫描电子显微镜图像显示生成了尺寸在35至50纳米之间的纳米球和纳米棒。X射线衍射测量显示出强的高强度峰，证实制备了高度结晶的氧化铝/氧化镍纳米复合材料。然后，研究了纯纳米氧化铝、氧化镍以及功能化氧化铝/氧化镍纳米复合材料在不同条件下（例如搅拌时间、pH值和初始氟化物浓度）对水进行除氟的性能。在pH值为7的溶液中，使用更环保的氧化铝、氧化镍和氧化铝/氧化镍纳米复合材料进行除氟，吸附剂用量为0.8 g/L时持续120分钟。三种吸附剂的吸附过程符合朗缪尔吸附等温线。使用准二级动力学和一级动力学探索了过程动力学。处理后的水质符合饮用水要求，证明了使用纳米颗粒进行饮用水除氟的可行性。这项工作证实了使用合成的纳米氧化铝、氧化镍及其纳米复合材料在结晶相中进行有效的水除氟，这突出了它们对未来饮用水除氟的重要性。
