Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/27751
Title: Correlation between flocculation and adsorption of cationic polyacrylamides on precipitated calcium carbonate
Authors: Rasteiro, Maria G. 
Pinheiro, Ineide 
Ahmadloo, Hamideh 
Hunkeler, David 
Garcia, Fernando A. P. 
Ferreira, Paulo 
Wandrey, Christine 
Keywords: Cationic polyacrylamide; Flocculation; Flocculation mechanisms; Adsorption; Langmuir isotherm
Issue Date: Nov-2014
Publisher: Elsevier
Citation: RASTEIRO, M. G.; PINHEIRO, Ineide; AHMADLOO, Hamideh; HUNKELER, David; GARCIA, Fernando A.; FERREIRA, Paulo; WANDREY, Christine Wandrey – Correlation between flocculation and adsorption of cationic polyacrylamides on precipitated calcium carbonate. [Em linha]. ESSN: 1744-3563. "Chemical Engineering Research and Design". In Press (Available online 20 November 2014). Disponível na Internet em:< http://hdl.handle.net/10316/28289>.
Abstract: The study of each stage of the flocculation process is essential to better understand and predict flocculation mechanisms. The adsorption of cationic polyacrylamide derivatives (C-PAM) onto precipitated calcium carbonate (PCC) has been investigated systematically as a function of the C-PAM characteristics including molar mass, chain architecture, and charge density. The adsorption results show that, for C-PAM of similar molar mass, highly branched architectures reach the equilibrium faster than linear C-PAM. Similarly, the flocculation rate is higher for the branched C-PAM, which may be indicative of the predominance of the bridging mechanism. In terms of the molar mass, lower molar mass leads to lower adsorption rates and slower flocculation. Adsorption isotherms of C-PAM onto precipitated calcium carbonate could be described by the Langmuir isotherm model. The maximum amount of C-PAM that adsorbs on the particle surface as a monolayer, obtained from adsorption tests through the Langmuir isotherm linear fit, could be correlated with the structure of the aggregates, obtained from flocculation experiments. Moreover, a good correlation was obtained between the adsorption results and the kinetics of the first stage of the flocculation process dominated by particle aggregation.
URI: http://hdl.handle.net/10316/27751
ISSN: 0263-8762
DOI: 10.1016/j.cherd.2014.11.007
Rights: openAccess
Appears in Collections:I&D CIEPQPF - Artigos em Revistas Internacionais
FCTUC Eng.Química - Artigos em Revistas Internacionais

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