Eggshell Membrane Assisted CdS Nanoparticles for Manganese Removal in Water Treatment  

Environment and Sustainability Institute, University of Exeter, Penryn Campus, Cornwall TR10 9FE, U.K.

Adv. Mater. Lett., 2021, 12 (3), 21031609

DOI: 10.5185/amlett.2021.031609

Publication Date (Web): Jan 06, 2021

Copyright © IAAM-VBRI Press

E-mail: A.Roy30@exeter.ac.uk (A.R.); S.Sundaram@exeter.ac.uk (S.S.)

Abstract

Domestic food waste chicken eggshells can produce naturally abundant protein-based eggshell membranes (ESMs), which is used as a less-explored source of sulphur to synthesize hexagonal CdS nanoparticles (NPs) under 365 nm (UVA) light irradiation. The perspective of CdS NPs synthesis in the way of UVA light irradiation soakage technique using ESM is distinctive compare to other traditional methods. Various physicochemical methods were employed to validate the formation of CdS NP using ESM assisted process. The obtained NPs exhibit an average particle size of ~5 nm as obtained from the transmission electron microscopy study. The capability of the synthesized CdS NPs was further explored in the catalysis reaction for the decomposition of KMnO₄, considered as toxic Mn^VII (violet) ion source at room temperature. The degradation results as monitored by UV-Vis spectrophotometry analysis confirms the CdS NPs exhibit excellent catalytic activity towards the reduction of KMnO₄, toxic Mn^VII (violet) ion to MnO₂ as non-toxic Mn^IV (brownish yellow) ion in aqueous solution (pH 7.0) at room temperature by 50 min. The KMnO₄ decomposition reaction follows a pseudo-first-order reaction having the rate constant value of 1.9 x 10^-2 min^-1. This study encourages the potential use of natural waste materials for wastewater treatment.

Keywords

ESM, CdS, UV-Light, wastewater, metal-ion