Manara - Qatar Research Repository
Browse
1-s2.0-S0927775722000590-main.pdf (4.11 MB)

Enhancing the flocculation of stable bentonite suspension using hybrid system of polyelectrolytes and NADES

Download (4.11 MB)
journal contribution
submitted on 2023-10-12, 09:18 and posted on 2023-10-16, 12:16 authored by Dana I.M. Al-Risheq, Shifa M.R. Shaikh, Mustafa S. Nasser, Fares Almomani, Ibnelwaleed A. Hussein, Mohammad K. Hassan

In this study, the influence of a hybrid coagulation/flocculation process on the electrokinetic of highly stable bentonite suspension has been examined. Choline chloride (ChCl) based natural deep eutectic solvent (NADES) was utilized as coagulant coupled with polyacrylamide (PAM) with different charge types and densities used as a flocculant. Turbidity, zeta potential, and floc size analysis were used to evaluate the changes in the flocculation efficiency of hybrid systems relative to the single NADES and PAM systems. The study revealed a clear impact on the flocculation behavior of cationic and anionic PAMs in the presence of NADES. The addition of NADES as a coagulant aid reversed the flocculation activities of the PAMs due to the presence of positively charged NADES that enhances the adsorption of the anionic polyacrylamide (APAM) over the cationic polyacrylamide (CPAM). Low flocculation efficiency was observed for the hybrid systems of NADES/CPAM as indicated by the highly positive zeta potential (ζ > + 25 mV) and small flocs (D50 < 50 μm). Hybrid systems of NADES/ APAMs, on the other hand, significantly improved the flocculation efficiency by achieving a zeta potential within the instability region ( − 10 mV < ζ < + 10 mV) and relatively large flocs D50 > 50 μm. Aside from the charge type, the molecular weight (MW) and charge density (CD) of the PAM had a significant impact on the flocculation behavior of bentonite suspension. High PAM adversely impacted the flocculation parameters for APAMs. Therefore, a hybrid system of NADES/ AN 923 SH at an APAM dosage of 15 mgL− 1 with residual turbidity of 0.3 NTU, ζ-potential of − 3.9 mV and D50 of 70.4 μm was the optimum system with the most significant enhancements compared to single systems.

Other Information

Published in: Colloids and Surfaces A: Physicochemical and Engineering Aspects
License: http://creativecommons.org/licenses/by/4.0/
See article on publisher's website: https://dx.doi.org/10.1016/j.colsurfa.2022.128305

Funding

Open Access funding provided by the Qatar National Library

History

Language

  • English

Publisher

Elsevier

Publication Year

  • 2022

License statement

This Item is licensed under the Creative Commons Attribution 4.0 International License

Institution affiliated with

  • Qatar University
  • College of Engineering - QU
  • Center for Advanced Materials - QU
  • Gas Processing Center - QU

Usage metrics

    Qatar University

    Licence

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC