Nitrogen activation of carbon-encapsulated zero-valent iron nanoparticles and influence of the activation temperature on heavy metals removal

International Symposium on Resource Exploration and Environmental Science

地球科学;生态环境科学

Bonaiti, Stefania^1 ; Calderon, Blanca^2 ; Collina, Elena^1 ; Lasagni, Marina^1 ; Mezzanotte, Valeria^1 ; Aracil, Ignacio^2 ; Fullana, Andrés^2

Dept. of Earth and Environmental Sciences, University of Milano-Bicocca, Milano, Italy^1

Dept. of Chemical Engineering, Alicante University, Alicante, Spain^2

关键词: Activation temperatures;    Core shell structure;    Environmental remediation;    Heavy metals removals;    Hydrothermal carbonization;    Reductive precipitation;    Zero valent iron (nZVI);    Zero-valent iron nanoparticles;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/64/1/012070/pdf
DOI  :  10.1088/1755-1315/64/1/012070

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Nanoparticles of zero-valent iron (nZVI) represent a promising agent for environmental remediation. This is due to their core-shell structure which presents the characteristics of both metallic and oxidised iron, leading to sorption and reductive precipitation of metal ions. Nevertheless, nZVI application presents some limitations regarding their rapid oxidation and aggregation in the media which leads to the delivery of the ions after some hours (the "aging effect"). To address these issues, modifications of nZVI structure and synthesis methods have been developed in the last years. The aging problem was solved by using nZVI encapsulated inside carbon spheres (CE-nZVI), synthetized through Hydrothermal Carbonization (HTC). Results showed high heavy metals removal percentage. Furthermore, CE-nZVI were activated with nitrogen in order to increase the metallic iron content. The aim of this study was to test CE-nZVI post-treated with nitrogen at different temperatures in heavy metals removal, demonstrating that the influence of the temperature was negligible in nanoparticles removal efficiency.