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Open AccessArticle

Electrochemical Evaluation of Selenium (IV) Removal from Its Aqueous Solutions by Unmodified and Modified Graphene Oxide

1
Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, CZ-61300 Brno, Czech Republic
2
Central European Institute of Technology, Brno University of Technology, Purkyňova 656/123, CZ-61200 Brno, Czech Republic
3
Department of Chemistry, Faculty of Natural Sciences, University of Tirana, Blv. Zog I, No. 2/1, 1001 Tirana, Albania
*
Author to whom correspondence should be addressed.
Molecules 2019, 24(6), 1063; https://doi.org/10.3390/molecules24061063
Received: 8 February 2019 / Revised: 8 March 2019 / Accepted: 13 March 2019 / Published: 18 March 2019
(This article belongs to the Special Issue Recent Advances of Bioanalytical Electrochemistry of Molecules)
The removal of selenium from superficial and waste water is a worldwide problem. The maximum limit according to the World Health Organization (WHO) for the selenium in the water is set at a concentration of 10 μg/L. Carbon based adsorbents have attracted much attention and recently demonstrated promising performance in removal of selenium. In this work, several materials (iron oxide based microparticles and graphene oxides materials) and their composites were prepared to remove Se(IV) from water. The graphene oxides were prepared according to the simplified Hummer’s method. In addition, the effect of pH, contact time and initial Se(IV) concentration was tested. An electrochemical method such as the differential pulse cathodic stripping voltammetry was used to determine the residual selenium concentration. From the experimental data, Langmuir adsorption model was used to calculate the maximum adsorption capacity. Graphene oxide particles modified by iron oxide based microparticles was the most promising material for the removal of Se(IV) from its aqueous solution at pH 2.0. Its adsorption efficiency reached more than 90% for a solution with given Se(IV) concentration, meanwhile its maximal recorded adsorption capacity was 18.69 mg/g. View Full-Text
Keywords: selenium removal; graphene oxide; water purification; electrochemistry; differential pulse cathodic stripping voltammetry selenium removal; graphene oxide; water purification; electrochemistry; differential pulse cathodic stripping voltammetry
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MDPI and ACS Style

Koudelkova, Z.; Bytesnikova, Z.; Xhaxhiu, K.; Kremplova, M.; Hynek, D.; Adam, V.; Richtera, L. Electrochemical Evaluation of Selenium (IV) Removal from Its Aqueous Solutions by Unmodified and Modified Graphene Oxide. Molecules 2019, 24, 1063.

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