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Open AccessArticle

Adsorption Properties of Magnetic Magnetite Nanoparticle for Coexistent Cr(VI) and Cu(II) in Mixed Solution

1
School of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China
2
School of Navigation, Dalian Maritime University, Dalian 116026, China
*
Author to whom correspondence should be addressed.
Water 2020, 12(2), 446; https://doi.org/10.3390/w12020446
Received: 12 December 2019 / Revised: 30 January 2020 / Accepted: 1 February 2020 / Published: 7 February 2020
(This article belongs to the Special Issue Removal of Heavy Metals from Wastewater)
The adsorption properties of coexistent Cr(VI) and Cu(II) in mixed solution on magnetic magnetite (Fe3O4) nanoparticle were studied in batch experiments. The influences of various factors, such as pH, adsorbent dose, temperature, initial concentration of metal ions, and coexisting ions in water were investigated. At the same time, the adsorption kinetics and adsorption isotherms were studied. The mechanism of adsorption for Cr(VI) and Cu(II) was investigated through the study of surface properties of Fe3O4, the presence of ions, and the influence of pH and zeta potential. The results indicate that pH has an influence on adsorption for Cr(VI) and Cu(II), and the optimal pH value for Cr(VI) and Cu(II) adsorption is 4.0. The adsorption efficiency increased with the increase of the adsorbent dose. Temperature under experimental design had no obvious effect. With 2.0 g/dm3 Fe3O4, the maximum adsorption capacity for Cr(VI) and Cu(II) reached 8.67 mg/g and 18.61 mg/g in mixed solution of 80 mg/dm3 Cr(VI) and Cu(II), respectively. Phosphorus had some influence on the adsorption for Cr(VI), and other coexisting anions and cations had no influence on the adsorption for Cr(VI) and Cu(II). The adsorption data for Cr(VI) and Cu(II) were nicely fit to the Langmuir adsorption equation and the pseudo-second-order model. As a multifunctional material, nano-Fe3O4 exhibited good adsorption performance for coexistent Cr(VI) and Cu(II) and could easily be separated and recovered under magnetic field. View Full-Text
Keywords: Cr(VI) and Cu(II) removal; magnetic Fe3O4 nanoparticle; adsorption Cr(VI) and Cu(II) removal; magnetic Fe3O4 nanoparticle; adsorption
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MDPI and ACS Style

Zhang, J.; Lin, S.; Han, M.; Su, Q.; Xia, L.; Hui, Z. Adsorption Properties of Magnetic Magnetite Nanoparticle for Coexistent Cr(VI) and Cu(II) in Mixed Solution. Water 2020, 12, 446.

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