Chemistry Department, Faculty of Science, New Valley University, El-Kharja, 72511, Egypt.
Department of Chemistry, College of Science, Majmaah University, Zulfi Campus, Al-Zulfi, 11932, Saudi Arabia.
Environ Sci Pollut Res Int. 2021 Jun;28(22):28014-28023. doi: 10.1007/s11356-021-12628-z. Epub 2021 Feb 1.
A facile, feasible, and green synthesis via an electrochemical exfoliation process was applied to synthesize nitrogen-doped MgO/graphene nanocomposite (N-MgO/G). The N-MgO/G nanocomposite was characterized by several analytical techniques including X-ray photoelectron spectroscopy, X-ray powder diffraction, transmission electron microscopy, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, selected area electron diffraction, and elemental mapping analysis. N-MgO/G nanocomposite was then applied to adsorb lead metal ions (Pb) from aqueous solutions. The N-MgO/G nanocomposite demonstrated a remarkably high Langmuir maximum adsorption capacity (294.12 mg/g) for Pb ions under the optimum experimental conditions at a pH of 5.13, time of 35 min, dose of 0.025 g, the concentration of 400 mg/L, and a temperature of 36 °C. Adsorption kinetics results fitted with a pseudo-second-order model and a thermodynamic study showed that Pb adsorption is an endothermic process. The practical application of N-MgO/G was also investigated to test its applicability in real water samples collected from different sources such as deionized water, tap water, wastewater, and river water.
通过电化学剥离工艺，采用一种简便、可行且绿色的合成方法，合成了氮掺杂氧化镁/石墨烯纳米复合材料（N-MgO/G）。采用 X 射线光电子能谱、X 射线粉末衍射、透射电子显微镜、场发射扫描电子显微镜、能谱分析、选区电子衍射和元素映射分析等多种分析技术对 N-MgO/G 纳米复合材料进行了表征。然后，将 N-MgO/G 纳米复合材料应用于从水溶液中吸附铅金属离子（Pb）。在 pH 值为 5.13、时间为 35 分钟、剂量为 0.025 克、浓度为 400mg/L 和温度为 36°C 的最佳实验条件下，N-MgO/G 纳米复合材料对 Pb 离子表现出极高的 Langmuir 最大吸附容量（294.12mg/g）。吸附动力学结果符合准二级模型，热力学研究表明，Pb 吸附是一个吸热过程。还研究了 N-MgO/G 的实际应用，以测试其在从不同来源（如去离子水、自来水、废水和河水）采集的实际水样中的适用性。
