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Open AccessArticle

Nanoscale Zero-Valent Iron Decorated on Bentonite/Graphene Oxide for Removal of Copper Ions from Aqueous Solution

by Jicheng Shao 1,†, Xiaoniu Yu 1,†, Min Zhou 1, Xiaoqing Cai 2,* and Chuang Yu 1
1
College of Civil Engineering and Architecture, Wenzhou University, Wenzhou 325035, China
2
College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Materials 2018, 11(6), 945; https://doi.org/10.3390/ma11060945
Received: 7 May 2018 / Revised: 31 May 2018 / Accepted: 1 June 2018 / Published: 4 June 2018
(This article belongs to the Section Advanced Nanomaterials and Nanotechnology)
The removal efficiency of Cu(II) in aqueous solution by bentonite, graphene oxide (GO), and nanoscale iron decorated on bentonite (B-nZVI) and nanoscale iron decorated on bentonite/graphene oxide (GO-B-nZVI) was investigated. The results indicated that GO-B-nZVI had the best removal efficiency in different experimental environments (with time, pH, concentration of copper ions, and temperature). For 16 hours, the removal efficiency of copper ions was 82% in GO-B-nZVI, however, it was 71% in B-nZVI, 26% in bentonite, and 18% in GO. Bentonite, GO, B-nZVI, and GO-B-nZVI showed an increased removal efficiency of copper ions with the increase of pH under a certain pH range. The removal efficiency of copper ions by GO-B-nZVI first increased and then fluctuated slightly with the increase of temperature, while B-nZVI and bentonite increased and GO decreased slightly with the increase of temperature. Lorentz-Transmission Electron Microscope (TEM) images showed the nZVI particles of GO-B-nZVI dispersed evenly with diameters ranging from 10 to 86.93 nm. Scanning electron microscope (SEM) images indicated that the nanoscale iron particles were dispersed evenly on bentonite and GO with no obvious agglomeration. The qe,cal (73.37 mg·g−1 and 83.89 mg·g−1) was closer to the experimental value qe,exp according to the pseudo-second-order kinetic model. The qm of B-nZVI and GO-B-nZVI were 130.7 mg·g−1 and 184.5 mg·g−1 according to the Langmuir model. View Full-Text
Keywords: zero-valent iron; bentonite; graphene oxide; copper ions; adsorption zero-valent iron; bentonite; graphene oxide; copper ions; adsorption
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Shao, J.; Yu, X.; Zhou, M.; Cai, X.; Yu, C. Nanoscale Zero-Valent Iron Decorated on Bentonite/Graphene Oxide for Removal of Copper Ions from Aqueous Solution. Materials 2018, 11, 945.

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