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Removal and recovery of Cr(VI) from wastewater by maghemite nanoparticles.
Water Res. 2005 Nov; 39(18):4528-36.WR

Abstract

Hexavalent chromium existing in the effluent is a major concern for the metal-processing plant. In this study, a new method combining nanoparticle adsorption and magnetic separation was developed for the removal and recovery of Cr(VI) from wastewater. The nanoscale maghemite was synthesized, characterized, and evaluated as adsorbents of Cr(VI). Various factors influencing the adsorption of Cr(VI), e.g., pH, temperature, initial concentration, and coexisting common ions were studied. Adsorption reached equilibrium within 15 min and was independent of initial Cr concentration. The maximum adsorption occurred at pH 2.5. The adsorption data were analyzed and fitted well by Freundlich isotherm. Cr(VI) adsorption capacity of maghemite nanoparticles was compared favorably with other adsorbents like activated carbon and clay. Competition from common coexisting ions such as Na+, Ca2+, Mg2+, Cu2+, Ni2+, NO3-, and Cl- was ignorable, which illustrated the selective adsorption of Cr(VI) from wastewater. Regeneration studies verified that the maghemite nanoparticles, which underwent six successive adsorption-desorption processes, still retained the original metal removal capacity. In addition, the adsorption mechanisms were investigated using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopic techniques.

Authors+Show Affiliations

Hu J
Environmental Engineering Program, School of Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
Chen G
No affiliation info available
Lo IM
No affiliation info available

MeSH

AdsorptionChromiumFerric CompoundsIonsMagneticsNanostructuresTimeWater Pollutants, ChemicalWater Purification

Pub Type(s)

Journal Article

Language

eng

PubMed ID

16146639

Citation

Hu, Jing, et al. "Removal and Recovery of Cr(VI) From Wastewater By Maghemite Nanoparticles." Water Research, vol. 39, no. 18, 2005, pp. 4528-36.
Hu J, Chen G, Lo IM. Removal and recovery of Cr(VI) from wastewater by maghemite nanoparticles. Water Res. 2005;39(18):4528-36.
Hu, J., Chen, G., & Lo, I. M. (2005). Removal and recovery of Cr(VI) from wastewater by maghemite nanoparticles. Water Research, 39(18), 4528-36.
Hu J, Chen G, Lo IM. Removal and Recovery of Cr(VI) From Wastewater By Maghemite Nanoparticles. Water Res. 2005;39(18):4528-36. PubMed PMID: 16146639.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Removal and recovery of Cr(VI) from wastewater by maghemite nanoparticles. AU - Hu,Jing, AU - Chen,Guohua, AU - Lo,Irene M C, Y1 - 2005/09/15/ PY - 2005/03/23/received PY - 2005/05/20/accepted PY - 2005/9/9/pubmed PY - 2006/2/4/medline PY - 2005/9/9/entrez SP - 4528 EP - 36 JF - Water research JO - Water Res VL - 39 IS - 18 N2 - Hexavalent chromium existing in the effluent is a major concern for the metal-processing plant. In this study, a new method combining nanoparticle adsorption and magnetic separation was developed for the removal and recovery of Cr(VI) from wastewater. The nanoscale maghemite was synthesized, characterized, and evaluated as adsorbents of Cr(VI). Various factors influencing the adsorption of Cr(VI), e.g., pH, temperature, initial concentration, and coexisting common ions were studied. Adsorption reached equilibrium within 15 min and was independent of initial Cr concentration. The maximum adsorption occurred at pH 2.5. The adsorption data were analyzed and fitted well by Freundlich isotherm. Cr(VI) adsorption capacity of maghemite nanoparticles was compared favorably with other adsorbents like activated carbon and clay. Competition from common coexisting ions such as Na+, Ca2+, Mg2+, Cu2+, Ni2+, NO3-, and Cl- was ignorable, which illustrated the selective adsorption of Cr(VI) from wastewater. Regeneration studies verified that the maghemite nanoparticles, which underwent six successive adsorption-desorption processes, still retained the original metal removal capacity. In addition, the adsorption mechanisms were investigated using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopic techniques. SN - 0043-1354 UR - https://www.unboundmedicine.com/medline/citation/16146639/Removal_and_recovery_of_Cr_VI__from_wastewater_by_maghemite_nanoparticles_ DB - PRIME DP - Unbound Medicine ER -