TY - JOUR
T1 - Ca2+ dependent flocculation efficiency of avian egg protein revealed unique surface specific interaction with kaolin particles
T2 - A new perception in bioflocculant research
AU - Kaarmukhilnilavan, Rajeshwari Srinivasan
AU - Selvam, Ammaiyappan
AU - WONG, Jonathan W C
AU - Murugesan, Kumarasamy
N1 - Funding Information:
This research work was financially supported by University Grants Commission and Council of Science and Industrial Research [UGC-CSIR File No.:F.16-6(DEC. 2016)/2017(NET)], India. The first authoris also grateful to the Periyar University, Salem for the financial support through University Research Fellowship (URF) and providing all the necessary facilities.
Funding Information:
This research work was financially supported by University Grants Commission and Council of Science and Industrial Research [UGC-CSIR File No.:F.16-6(DEC. 2016)/2017(NET)], India. The first authoris also grateful to the Periyar University, Salem for the financial support through University Research Fellowship (URF) and providing all the necessary facilities.
PY - 2020/10/20
Y1 - 2020/10/20
N2 - 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.
AB - 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.
KW - Cation
KW - COOH residue
KW - Flocculation
KW - Gibbsite plane
KW - Kaolin
UR - http://www.scopus.com/inward/record.url?scp=85087965459&partnerID=8YFLogxK
U2 - 10.1016/j.colsurfa.2020.125177
DO - 10.1016/j.colsurfa.2020.125177
M3 - Journal article
AN - SCOPUS:85087965459
SN - 0927-7757
VL - 603
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
M1 - 125177
ER -
