Publication detail

Electrochemical evaluation of selenium (IV) removal from its aqueous solutions by unmodified and modified graphene oxide

KOUDELKOVÁ, Z. BÝTEŠNÍKOVÁ, Z. XHAXHIU, K. KREMPLOVÁ, M. HYNEK, D. ADAM, V. RICHTERA, L.

Original Title

Electrochemical evaluation of selenium (IV) removal from its aqueous solutions by unmodified and modified graphene oxide

Type

journal article in Web of Science

Language

English

Original Abstract

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 g/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.

Keywords

selenium removal; graphene oxide; water purification; electrochemistry; differential pulse cathodic stripping voltammetry

Authors

KOUDELKOVÁ, Z.; BÝTEŠNÍKOVÁ, Z.; XHAXHIU, K.; KREMPLOVÁ, M.; HYNEK, D.; ADAM, V.; RICHTERA, L.

Released

2. 3. 2019

Publisher

MDPI

ISBN

1420-3049

Periodical

MOLECULES

Year of study

24

Number

6

State

Swiss Confederation

Pages from

1

Pages to

13

Pages count

13

URL

http://www.mdpi.com/1420-3049/24/6/1063

Full text in the Digital Library

http://hdl.handle.net/11012/180501

BibTex

@article{BUT156772,
  author="Zuzana {Koudelková} and Zuzana {Bytešníková} and Kledi {Xhaxhiu} and Monika {Kremplová} and David {Hynek} and Vojtěch {Adam} and Lukáš {Richtera}",
  title="Electrochemical evaluation of selenium (IV) removal from its aqueous solutions by unmodified and modified graphene oxide",
  journal="MOLECULES",
  year="2019",
  volume="24",
  number="6",
  pages="1--13",
  doi="10.3390/molecules24061063",
  issn="1420-3049",
  url="http://www.mdpi.com/1420-3049/24/6/1063"
}