Aboelfetoh Eman F
Chemistry Department, Faculty of Science, Tanta University, Tanta, 31527, Egypt.
Sci Rep. 2025 Jul 27;15(1):27342. doi: 10.1038/s41598-025-12170-9.
The development of efficient adsorbents and catalysts is crucial for enhanced pollutant removal and catalytic performance. In this study, a magnetically separable rGO/FeO/Ag nanocomposite was synthesized via a facile one step hydrothermal method, enabling simultaneous reduction of graphene oxide (GO) and in situ deposition of FeO and Ag nanoparticles. The nanocomposite's structure, surface features, and magnetic properties were confirmed through appropriate characterization techniques. The nanocomposite exhibited high adsorption efficiency toward methyl violet 2B (MV), with performance evaluated across varying dye concentrations, pH, temperature, and adsorbent dosages. Statistical error analysis (reduced χ, RMSE, SSE) validated the applicability of a pseudo-second-order kinetics. The adsorption data also fit Langmuir isotherm, revealing a maximum uptake (q) of 168.70 mg/g. Employing NaBH as reductant, the nanocomposite achieved rapid p-nitroaniline (p-NA) hydrogenation to p-phenylenediamine (p-PDA), achieving 97.60% conversion within 3 min and a rate constant of 0.95 min⁻, consistent with pseudo-first-order kinetics. The nanocomposite's strong magnetic responsiveness (Ms = 30 emu/g) enabled efficient separation and reusability, maintaining stable performance over five adsorption and eight catalytic cycles.
开发高效的吸附剂和催化剂对于提高污染物去除率和催化性能至关重要。在本研究中，通过简便的一步水热法合成了一种磁性可分离的rGO/FeO/Ag纳米复合材料，实现了氧化石墨烯（GO）的同时还原以及FeO和Ag纳米颗粒的原位沉积。通过适当的表征技术确认了该纳米复合材料的结构、表面特征和磁性。该纳米复合材料对甲基紫2B（MV）表现出高吸附效率，并在不同染料浓度、pH值、温度和吸附剂用量下对其性能进行了评估。统计误差分析（降低的χ、RMSE、SSE）验证了准二级动力学的适用性。吸附数据也符合朗缪尔等温线，显示最大吸附量（q）为168.70 mg/g。以硼氢化钠为还原剂，该纳米复合材料实现了对硝基苯胺（p-NA）快速加氢生成对苯二胺（p-PDA），3分钟内转化率达到97.60%，速率常数为0.95 min⁻¹，符合准一级动力学。该纳米复合材料具有很强的磁响应性（Ms = 30 emu/g），能够实现高效分离和重复使用，在五个吸附和八个催化循环中保持稳定性能。
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