Cerium dioxide and composites for the removal of toxic metal ions
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The presence of contaminants in potable water is a cause of worldwide concern. In particular, the presence of metals such as arsenic, lead, cadmium, mercury, chromium can affect human health. There is thus a need for advanced techniques of water decontamination. Adsorbents based on cerium dioxide (CeO2), also named ‘ceria,’ have been used to remove contaminants such as arsenic, fluoride, lead and cadmium. Ceria and composites display high surface area, controlled porosity and morphology, and abundance of functional groups. They have already found usage in many applications including optical, semiconductor and catalysis. Exploiting their attractive features for water treatment would unravel their potential. We review the potential of ceria and its composites for the removal of toxic metal ions from aqueous medium. The article discusses toxic contaminants in water and their impact on human health; the synthesis and adsorptive behavior of ceria-based materials including the role of morphology and surface area on the adsorption capacity, best fit adsorption isotherms, kinetic models, possible mechanisms, regeneration of adsorbents; and future perspectives of using metal oxides such as ceria. The focus of the report is the generation of cost-effective oxides of rare-earth metal, cerium, in their standalone and composite forms for contaminant removal.
KeywordsCeria Metal ion Composite CeO2 Arsenic Water purification
Authors thank the Centre for Incubation, Innovation, Research and Consultancy, Jyothy Institute of Technology and Sri Sringeri Sharadha Peetam for supporting this study. Dr. Inamuddin is thankful to the King Abdulaziz University, Jeddah, Saudi Arabia, to carry out this study.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
- Ansari R, Hasanzadeh M, Ostovar F (2017) Arsenic removal from water samples using CeO2/Fe2O3 nanocomposite. Int J Nanosci Nanotechnol 13:335–345Google Scholar
- Basu T, Ghosh UC (2013) Nano-structured iron(III)–cerium(IV) mixed oxide: synthesis, characterization and arsenic sorption kinetics in the presence of co-existing ions aiming to apply for high arsenic groundwater treatment. Appl Surf Sci 283:471–481. https://doi.org/10.1016/j.apsusc.2013.06.132 CrossRefGoogle Scholar
- Dados A, Paparizou E, Eleftheriou P et al (2014b) Nanometer-sized ceria-coated silica–iron oxide for the reagentless microextraction/preconcentration of heavy metals in environmental and biological samples followed by slurry introduction to ICP-OES. Talanta 121:127–135. https://doi.org/10.1016/j.talanta.2013.12.045 CrossRefGoogle Scholar
- Jena S (2012) Synthesis of ceria nanopowder for the removal of hexavalent chromium from synthetic Cr(VI) solution. Doctoral dissertationGoogle Scholar
- Li Z, Shen Y, Li X et al (2016) Synergetic catalytic removal of HgO and NO over CeO2(ZrO2)/TiO2. Catal Commun 82:55–60. https://doi.org/10.1016/j.catcom.2016.04.019Shortcommunication CrossRefGoogle Scholar
- Martin S, Griswold W (2009) Human health effects of heavy metals. Environ Sci Technol Br Citiz 15:1–6Google Scholar
- Priyadharsan A, Vasanthakumar V, Karthikeyan S et al (2017) Multi-functional properties of ternary CeO2/SnO2/rGO nanocomposites: visible light driven photocatalyst and heavy metal removal. J Photochem Photobiol A Chem 346:32–45. https://doi.org/10.1016/j.jphotochem.2017.05.030 CrossRefGoogle Scholar
- Talebzadeh F, Zandipak R, Sobhanardakani S (2016) CeO2 nanoparticles supported on CuFe2O4 nanofibers as novel adsorbent for removal of Pb(II), Ni(II), and V(V) ions from petrochemical wastewater. Desalin Water Treat 57:28363–28377. https://doi.org/10.1080/19443994.2016.1188733 CrossRefGoogle Scholar
- Yamamura S, Bartram J, Csanady M et al (2003) Drinking water guidelines and standards. Arsenic, water, and health: the state of the art. World Health Organization, Geneva, SwitzerlandGoogle Scholar