Department of Environmental Science and Engineering, Guru Jambheshwar University of Science and Technology, Hisar 125001, India.
Department of Environmental Science and Engineering, Guru Jambheshwar University of Science and Technology, Hisar 125001, India; Department of Environmental Science and Technology, Central University of Punjab, Bathinda 151001, Punjab, India.
Environ Res. 2019 May;172:43-54. doi: 10.1016/j.envres.2019.02.002. Epub 2019 Feb 2.
This work explored the potential of magnetic sawdust carbon nanocomposites for cationic dyes removal from aqueous medium. EDTA modified magnetic sawdust carbon nanocomposites (EDTA@FeO/SC ncs) were prepared by biogenic green reduction and precipitation approach. The surface properties, structure and composition of nanocomposites were characterized by HRTEM, FESEM, XRD, EDX, BET, FTIR etc. The FeO nanoparticles were 10-20 nm in diameters and having 14 m/g surface area. Removal of Methylene blue (MB) and Brilliant green (BG) dyes from aqueous medium was studied in batch mode experiments. The maximum removal was achieved at neutral pH 7.0 with in 30 min. Adsorption capacity of EDTA@FeO/SC for MB and BG dyes was 227.3 mg/g and 285.7 mg/g, respectively. Dye adsorption behaviour is well explained by Freundlich model. The rate of cationic dye adsorption is explained by pseudo-second order model. The value of thermodynamic parameters confirmed that adsorption process was spontaneous and favourable. Desorption and reusable efficiency of nanocomposites was also evaluated.
本工作探索了磁性锯末碳纳米复合材料从水介质中去除阳离子染料的潜力。通过生物绿色还原和沉淀方法制备了 EDTA 修饰的磁性锯末碳纳米复合材料（EDTA@FeO/SC ncs）。通过 HRTEM、FESEM、XRD、EDX、BET、FTIR 等对纳米复合材料的表面性质、结构和组成进行了表征。FeO 纳米颗粒的直径为 10-20nm，比表面积为 14m/g。在批量实验中研究了从水介质中去除亚甲蓝（MB）和亮绿（BG）染料。在中性 pH 7.0 下，30min 内达到最大去除率。EDTA@FeO/SC 对 MB 和 BG 染料的吸附容量分别为 227.3mg/g 和 285.7mg/g。染料吸附行为很好地解释了 Freundlich 模型。阳离子染料吸附的速率由伪二级模型解释。热力学参数的值证实了吸附过程是自发和有利的。还评估了纳米复合材料的解吸和可重复使用效率。
