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Article

Green Synthesis of Iron Nanoparticles Using Green Tea and Its Removal of Hexavalent Chromium

by 1,2, 1,*, 1,3 and 4,*
1
Key Laboratory of Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China
2
Environmental Protection Research Institute of Light Industry, Beijing 100089, China
3
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
4
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
*
Authors to whom correspondence should be addressed.
Academic Editor: George Z. Kyzas
Nanomaterials 2021, 11(3), 650; https://doi.org/10.3390/nano11030650
Received: 6 February 2021 / Revised: 26 February 2021 / Accepted: 26 February 2021 / Published: 8 March 2021
Chromium (VI) is a ubiquitous groundwater contaminant and it is dangerous to both ecological and human health. Iron nanoparticles (nFe) have a large specific surface area and they are highly efficient in removing chromium (VI) from aqueous solution. However, since the traditional reductive synthesis of nFe is relatively expensive and often causes secondary pollution, it is necessary to develop a low-cost green synthetic method using plant extracts. Synthetic conditions are important for obtaining highly active chromium-removing nanomaterials. In this paper, a green tea extract was used to prepare nFe and the effects of synthetic conditions on subsequent remediation performance were investigated. The optimal conditions included a green tea extract/Fe2+ ratio of 1:2 (91.6%), a green tea extract temperature of 353 K (88.3%) and a synthetic temperature of 298 K (88.1%). Advanced material characterization techniques, including XPS, SEM-EDS, TEM, and Brunauer–Emmett–Teller (BET) confirmed that the average particle size was between 50–80 nm, with a specific surface area of 42.25 m2·g−1. Furthermore nFe had a core-shell structure, where Fe (0) constituted the core and a shell was composed of iron oxide. Finally, a mechanism for synthesizing nFe by green tea extract was proposed, providing a theoretical basis for optimized synthetic conditions for preparing nFe when using green tea extract. View Full-Text
Keywords: Cr(VI); iron nanoparticles; green tea extract; removal efficiency Cr(VI); iron nanoparticles; green tea extract; removal efficiency
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MDPI and ACS Style

Hao, R.; Li, D.; Zhang, J.; Jiao, T. Green Synthesis of Iron Nanoparticles Using Green Tea and Its Removal of Hexavalent Chromium. Nanomaterials 2021, 11, 650. https://doi.org/10.3390/nano11030650

AMA Style

Hao R, Li D, Zhang J, Jiao T. Green Synthesis of Iron Nanoparticles Using Green Tea and Its Removal of Hexavalent Chromium. Nanomaterials. 2021; 11(3):650. https://doi.org/10.3390/nano11030650

Chicago/Turabian Style

Hao, Runqin, Dong Li, Jie Zhang, and Tifeng Jiao. 2021. "Green Synthesis of Iron Nanoparticles Using Green Tea and Its Removal of Hexavalent Chromium" Nanomaterials 11, no. 3: 650. https://doi.org/10.3390/nano11030650

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