Ca2+ dependent flocculation efficiency of avian egg protein revealed unique surface specific interaction with kaolin particles: A new perception in bioflocculant research

Rajeshwari Srinivasan Kaarmukhilnilavan, Ammaiyappan Selvam, Jonathan W C WONG, Kumarasamy Murugesan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, the flocculation efficiency (FE) of avian egg-white was investigated as a protein rich natural bioflocculant to flocculate kaolin dispersion. The FE was optimized under various conditions. Its cation dependent interaction with kaolin basal planes was also investigated through FT-IR, EEM, Zeta Potential and SEM-EDX techniques. The maximum flocculation rate (91 %) was observed at the CaCl2 dosage of 100 ppm and at pH 6.0 due to the electrostatic interaction of Ca2+ ions with the gibbsite basal planes of kaolin at this condition. Among several monovalent, divalent and trivalent cations, Ca2+ alone showed higher FE than other cations. It showed the unique interaction of Ca2+ ions with Avian Egg-white Flocculant (AVGF) functional groups. EEM study was used to reveal the involvement of such functional groups. The results revealed that the carboxylate groups instead of aromatic amino acid side chains are involving in such interaction. This hypothesis was further confirmed in wastewater flocculation experiments in which the Ca2+ and AVGF complex showed weak interaction with suspended particles of domestic wastewater.

Original languageEnglish
Article number125177
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume603
DOIs
Publication statusPublished - 20 Oct 2020

Scopus Subject Areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

User-Defined Keywords

  • Cation
  • COOH residue
  • Flocculation
  • Gibbsite plane
  • Kaolin

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