Adsorption of Methylene Blue Dye on Hydrothermally Prepared Tungsten Oxide Nanosheets

Doma, Ahmed; Hassan, Nazly; Abd-Elhamid, Ahmed Ibrahim; Soliman, Hesham

doi:10.21608/ejchem.2020.18997.2171

Adsorption of Methylene Blue Dye on Hydrothermally Prepared Tungsten Oxide Nanosheets

Document Type : Original Article

Authors

¹ Polymeric Materials Research Dept., Advanced Technology and New Materials Research Institute (ATNMRI), City for Scientific Research and Technological Applications (SRTA-City), New Borg Al-Arab City, 21934 Alexandria, Egypt

² Composites and Nanostructures Materials Research Department, Advanced Technology and New Materials Research Institute (ATNMRI),City of Scientific Research and Technological Applications (SRTA-City),New Borg Al-Arab City,21934 Alexandria,Egypt

³ Composites and Nanostructured Materials Research Department, Advanced Technology and New Material Research Institute, City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City Alexandria, Egypt P. O. Box 21934.

⁴ Advanced Technology and New Materials Research Institute (ATNMRI), City for Scientiﬁc Research and Technological Applications (SRTA-City), New Borg El-Arab City, 21934 Alexandria, Egypt.

10.21608/ejchem.2020.18997.2171

Abstract

Methylene blue (MB) dye was successfully adsorbed on hydrothermally prepared tungsten oxide nanosheets. SEM, XRD, FTIR and EDS were used for characterization of the prepared powder. Different parameters affecting the adsorption process such as, contact time, tungsten oxide dose, MB concentration, pH and temperature were investigated. The experimental data were fitted by first, second-order kinetic and intra-particle diffusion models in order to detect the kinetic of adsorption process. The second-order model is providing the best description of MB adsorption onto WO3.H2O. Adsorption equilibrium data obtained from Langmuir, Freundlich and Tempkin isotherm models, showed that the dye uptake is chemisorptions process. Thermodynamic data reveals that the adsorption reaction is exothermic and spontaneous. The effect of different crystalline phases of tungsten oxide nanosheets was investigated. Hydrated form WO3·H2O nanosheets show high adsorption performance, while the adsorption was poor in case of non-hydrated structure WO3 nanosheets.

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