Comparative study on the effectiveness of hydrophobically modified cationic polyacrylamide groups in the flocculation of kaolin

Khai Ern Lee, Norhashimah Morad, Beng Teik Poh, Tjoon Tow Teng

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

A series of hydrophobic cationic monomers were introduced into acrylamide chain to form hydrophobically modified cationic polyacrylamide. The hydrophobic cationic monomer used in this study was 3-acrylamido-2-hydroxypropyltrialkylammonium chloride (AHPTAAC) in which the alkyl groups were hexyl, octyl and dodecyl groups. The characteristics of the copolymers were tuned by varying the mole ratios of the hydrophobic cationic monomers (1-6mol %) to obtain copolymers of different molecular weights and charge densities. The effects of hydrophobically modified cationic polyacrylamides, with different hydrophobic cationic groups, molecular weights and charge densities, on flocculation of kaolin suspension, were investigated. A significant inverse correlation was found between molecular weight and charge density. The effects of different hydrophobic groups and monomer substitution ratios on the kaolin turbidity removal were compared. Hexyl group copolymer, which had the highest molecular weight of 2.13×106g/mol, was able to reduce 99% of kaolin suspension turbidity through flocculation. 1mol % of hydrophobic group associated copolymers was found to be the best system in flocculating kaolin suspension, and bridging was the dominant mechanism in flocculating kaolin suspension. Copolymer with the dodecyl group had the least water retention in the flocculated sludge.

Original languageEnglish
Pages (from-to)206-213
Number of pages8
JournalDesalination
Volume270
Issue number1-3
DOIs
Publication statusPublished - 1 Apr 2011
Externally publishedYes

Fingerprint

Kaolin
Flocculation
kaolin
Polyacrylates
flocculation
comparative study
Copolymers
Suspensions
Monomers
Charge density
Molecular weight
Turbidity
turbidity
Acrylamide
water retention
Chlorides
substitution
Substitution reactions
sludge
chloride

Keywords

  • Cationic polyacrylamide
  • Flocculation
  • Hydrophobically modified
  • Kaolin

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Mechanical Engineering
  • Chemistry(all)
  • Materials Science(all)
  • Water Science and Technology

Cite this

Comparative study on the effectiveness of hydrophobically modified cationic polyacrylamide groups in the flocculation of kaolin. / Lee, Khai Ern; Morad, Norhashimah; Poh, Beng Teik; Teng, Tjoon Tow.

In: Desalination, Vol. 270, No. 1-3, 01.04.2011, p. 206-213.

Research output: Contribution to journalArticle

Lee, Khai Ern ; Morad, Norhashimah ; Poh, Beng Teik ; Teng, Tjoon Tow. / Comparative study on the effectiveness of hydrophobically modified cationic polyacrylamide groups in the flocculation of kaolin. In: Desalination. 2011 ; Vol. 270, No. 1-3. pp. 206-213.
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