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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 13, No. 2, 2016, pp. 679-690
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Bioline Code: st16062
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 13, No. 2, 2016, pp. 679-690
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Synthetic polyacrylamide as a potential flocculent to remove commercial chromium(III) oxide from aqueous suspension
Wiśniewska, M.; Chibowski, S. & Urban, T.
Abstract
The effects of solution pH and cationic group
contents in polyacrylamide (PAM) macromolecules on the
polymer adsorption mechanism on chromium(III) oxide
surface were studied. The structure of PAM adsorption
layer was also characterized to explain the changes in solid
suspension stability. The following methods were applied:
turbidimetry, spectrophotometry, potentiometric titration
and microelectrophoresis. Thanks to them, the stability of
the Cr2O3–polymer systems, polymer-adsorbed amount,
surface charge density and zeta potential of solid particles
were determined. The experimental results indicate that
adsorption of cationic PAM increases with the rising pH.
The larger the content of cationic groups in PAM chains is,
the higher the adsorption level is observed. The most
effective chromium(III) oxide removal is achieved at pH 9
after addition of PAM with the largest content of cationic
groups (i.e. 80 %). The neutralization of solid surface
negative charge by positively charged polymer chains
(assuming more coiled conformation) is responsible for
this.
Keywords
Cationic group content; Cationic polyacrylamide; Cr2O3 removal; Polymer adsorption; Suspension destabilization
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