Abbas Somia M, Abas Khadiga M
Inorganic Chemistry Department, National Research Centre, 33 El Bohouth St., (Former El Tahrir St.), Dokki, Giza, 12622, Egypt.
Physical Chemistry Department, Advanced Materials Technology and Mineral Resources Research Institute, National Research Centre, 33 El-Bohouth St, Giza, 12622, Egypt.
BMC Chem. 2025 Jul 24;19(1):221. doi: 10.1186/s13065-025-01584-1.
Amendable nanomaterials are preferred for wastewater remediation. Silver (Ag) and graphene materials have drawn significant consideration for wastewater treatment due to their good dispersibility in aqueous systems, biocompatibility, and catalytic activity. For this purpose, an easy-to-follow procedure has been developed to prepare exfoliated graphite (EG) involving a binary-component system composed of concentrated HSO and (NH)SO. Afterwards, Ag@EG composite catalysts were prepared by in-situ decoration of silver nanoparticles (AgNPs) over EG by sonication. The prepared catalysts were investigated for methylene blue (MB) dye removal from wastewater using a homogeneous Fenton-like oxidation process (HO/Ag). Process-controlling factors like HO dose, solution pH, and dye concentrations were explored. The results showed that MB dye degradation in the Fenton-like oxidation process can be clarified by a pseudo-first-order kinetic model. The highest dye degradation efficiency (99.8%) was achieved using Ag@EG (1:1). The morphology and structural characteristics of the prepared catalysts were evaluated by SEM, TEM, EDX, XRD, Raman spectroscopy, FTIR, and UV-Vis analyses. The activation energy, enthalpy, and entropy of the catalytic degradation of the MB dye in the presence of prepared catalysts were established. The data elucidated that most MB dye degraded within 120 min when using mesoporous Ag@EG (1:1) catalyst. Ag@EG (1:1), with a high S (87 m/g), functioned as a Fenton-like oxidation catalyst, exhibiting high degradation efficiency compared to other cited catalysts.
可改性的纳米材料更适合用于废水修复。银（Ag）和石墨烯材料因其在水体系中的良好分散性、生物相容性和催化活性，在废水处理方面受到了广泛关注。为此，已开发出一种简单易行的方法来制备膨胀石墨（EG），该方法涉及由浓硫酸（H₂SO₄）和硫酸铵（(NH₄)₂SO₄）组成的二元体系。之后，通过超声处理在EG上原位修饰银纳米颗粒（AgNPs）制备了Ag@EG复合催化剂。使用均相类芬顿氧化法（H₂O₂/Ag）研究了所制备的催化剂对废水中亚甲基蓝（MB）染料的去除效果。探讨了诸如H₂O₂剂量、溶液pH值和染料浓度等过程控制因素。结果表明，类芬顿氧化过程中MB染料的降解可用准一级动力学模型来解释。使用Ag@EG（1:1）时实现了最高的染料降解效率（99.8%）。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、能谱仪（EDX）、X射线衍射仪（XRD）、拉曼光谱、傅里叶变换红外光谱（FTIR）和紫外可见光谱（UV-Vis）分析对所制备催化剂的形态和结构特征进行了评估。确定了在制备的催化剂存在下MB染料催化降解的活化能、焓和熵。数据表明，使用介孔Ag@EG（1:1）催化剂时，大多数MB染料在120分钟内降解。具有高比表面积（87 m²/g）的Ag@EG（1:1）作为类芬顿氧化催化剂，与其他引用的催化剂相比表现出高降解效率。
