期刊
ENVIRONMENTAL TECHNOLOGY & INNOVATION
卷 23, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.eti.2021.101566
关键词
Adsorption; Green synthesis; Cr(VI); Iron nanoparticles; Removal mechanism
资金
- National Ministry of Environmental Protection Standard Preparation Project, China from Beijing Environmental Protection Research Institute of Light Industry [2016-54]
Green tea extract was utilized as a reducing and coating agent in the synthesis of iron nanoparticles for the removal of Cr(VI) from aqueous solution. Kinetic and thermodynamic analysis suggested an adsorption mechanism best described by Langmuir isotherm and pseudo-second order models, with adsorption found to be spontaneous and endothermic. Advanced characterization techniques, such as SEM-EDS, TEM and XPS, revealed a detailed mechanism involving both adsorption and redox reactions.
While many studies have successfully used plant extracts to biosynthesize iron nanoparticles as low-cost, sustainable and high-performance materials for removing Cr(VI) from aqueous solution, the exact removal mechanism involved remains poorly understood. In this research, a green tea extract was employed both as a reducing and coating agent to prepare iron nanoparticles (GT-nFe) via an environmentally friendly green synthesis method, where the material so produced was then used to remove Cr(VI) from aqueous solution. The efficiency in removing Cr(VI) using GT-nFe reached 90.2 % at an initial Cr(VI) concentration of 60 mg L-1 and pH of 5.0. Kinetic and thermodynamic analysis indicated that Langmuir isotherm and pseudo-second order models best described the adsorption of Cr(VI) by GT-nFe. Thermodynamic studies revealed that adsorption was spontaneous (Delta G(0)<0) and endothermic (Delta H-0>0). Application of advanced characterization techniques, including SEM-EDS, TEM and XPS, indicated a detailed Cr(VI) removal mechanism involving both adsorption and redox reactions. (C) 2021 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据