Hemdan Mohamed, Fayad Eman, Binjawhar Dalal Nasser, Elsaid Fahmy Gad, Mubarak Mahmoud F
School of Biotechnology, Badr University in Cairo (BUC), Badr City, Cairo 11829, Egypt.
Department of Biotechnology, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia.
Int J Biol Macromol. 2025 Sep;321(Pt 3):146418. doi: 10.1016/j.ijbiomac.2025.146418. Epub 2025 Aug 4.
The persistent presence of synthetic dyes such as methylene blue (MB) in industrial wastewater poses serious environmental and health hazards due to their toxicity, stability, and resistance to conventional treatment methods. In this study, we report the development of a novel and eco-friendly Alginate@ZIF-8/Moringa Oleifera nano-biocomposite (Alg@ZIF-8/MO-NBC) for the effective adsorption of MB from aqueous solutions. The composite was fabricated by incorporating Zeolitic Imidazolate Framework-8 (ZIF-8) into a matrix of sodium alginate and carbonized Moringa Oleifera seed powder. Comprehensive characterization using SEM confirmed the composite's hierarchical porous structure, while FTIR revealed functional group interactions among the components. XRD analysis validated the crystalline structure of ZIF-8, and TGA demonstrated enhanced thermal stability. BET analysis showed a high specific surface area of 452.8 m/g and mesoporous nature. Adsorption studies revealed a maximum MB uptake of 297.84 mg/g with a removal efficiency exceeding 98.54 %. The adsorption kinetics were best described by the pseudo-second-order (PSO) model, with high correlation coefficients for both linear (R = 0.9994) and nonlinear (R = 0.9996) fittings at initial MB concentration of 100 mg/L. Similarly, equilibrium data conformed well to the Langmuir isotherm model, with R values of 0.999 (linear) and 0.998 (nonlinear), indicating monolayer adsorption. Thermodynamic analysis confirmed that the process is spontaneous and endothermic. Notably, the composite exhibited excellent reusability, maintaining over 90 % efficiency after 5 cycles. These results highlight the Alg@ZIF-8/MO-NBC composite as a promising, sustainable material for advanced wastewater treatment applications.
亚甲基蓝（MB）等合成染料持续存在于工业废水中，因其毒性、稳定性以及对传统处理方法的抗性，对环境和健康构成严重危害。在本研究中，我们报告了一种新型环保的海藻酸钠@ZIF-8/辣木纳米生物复合材料（Alg@ZIF-8/MO-NBC）的研发，用于从水溶液中有效吸附MB。该复合材料通过将沸石咪唑酯骨架-8（ZIF-8）掺入海藻酸钠基质和碳化辣木种子粉末中制备而成。使用扫描电子显微镜（SEM）进行的全面表征证实了复合材料的分级多孔结构，而傅里叶变换红外光谱（FTIR）揭示了各组分之间的官能团相互作用。X射线衍射（XRD）分析验证了ZIF-8的晶体结构，热重分析（TGA）表明其热稳定性增强。比表面积分析（BET）显示其比表面积高达452.8 m²/g且具有介孔性质。吸附研究表明，MB的最大吸附量为297.84 mg/g，去除效率超过98.54%。吸附动力学最好用伪二级（PSO）模型描述，在初始MB浓度为100 mg/L时，线性（R = 0.9994）和非线性（R = 0.9996）拟合的相关系数都很高。同样，平衡数据很好地符合朗缪尔等温线模型，线性（R值为0.999）和非线性（R值为0.998）的R值表明为单层吸附。热力学分析证实该过程是自发的且吸热。值得注意的是，该复合材料表现出优异的可重复使用性，在5个循环后仍保持超过90%的效率。这些结果突出了Alg@ZIF-8/MO-NBC复合材料作为一种有前景的可持续材料，可用于高级废水处理应用。
