TY - JOUR
T1 - The inhibition abilities of multifunctional polyelectrolytes for silica scale formation in cooling water systems
T2 - Role of the nonionic functional group
AU - Nishida, Ikuko
AU - Okaue, Yoshihiro
AU - Yokoyama, Takushi
N1 - Funding Information:
The authors thank for financial supported of Steel Industry Foundation for the Advancement of Environmental Protection Technology (2009).
Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2011/8/1
Y1 - 2011/8/1
N2 - The abilities of multifunctional polyelectrolytes to enhance aluminum hydroxide dispersion and inhibit silica scale formation were examined in a pilot cooling water system. The following multifunctional polyelectrolytes were studied: a terpolymer of acrylic acid (AA), 2-acrylamide-2-methyl propane sulfonic acid (SA) and N-vinylpyrrolidone (NVP) (P(AA/SA/NVP)), acrylic acid homopolymer (P(AA)) and a copolymer of AA and SA (P(AA/SA)). The order of inhibition ability was P(AA/SA/NVP)>P(AA/SA)>P(AA), and was consistent with that of the dispersing ability for aluminum hydroxide. Other terpolymers incorporating different nonionic monomers were also examined and factors affecting their inhibition abilities were investigated, based on interaction energies calculated by density functional theory. Based on the correlation between scale inhibition abilities and interaction energies, we elucidated that the effective nonionic monomer of terpolymer for silica scale inhibition had low affinity for aluminum hydroxide and high affinity for H2O and Si(OH)3O-. The affinities of nonionic monomer for aluminum hydroxide and H2O suggested that there was proper conformation of polyelectrolyte adsorbed for effectively dispersing aluminum hydroxide. Also, high affinity of nonionic monomer for Si(OH)3O- suggested that interacting Si(OH)3O- is an important role of inhibition of silica scale formation.
AB - The abilities of multifunctional polyelectrolytes to enhance aluminum hydroxide dispersion and inhibit silica scale formation were examined in a pilot cooling water system. The following multifunctional polyelectrolytes were studied: a terpolymer of acrylic acid (AA), 2-acrylamide-2-methyl propane sulfonic acid (SA) and N-vinylpyrrolidone (NVP) (P(AA/SA/NVP)), acrylic acid homopolymer (P(AA)) and a copolymer of AA and SA (P(AA/SA)). The order of inhibition ability was P(AA/SA/NVP)>P(AA/SA)>P(AA), and was consistent with that of the dispersing ability for aluminum hydroxide. Other terpolymers incorporating different nonionic monomers were also examined and factors affecting their inhibition abilities were investigated, based on interaction energies calculated by density functional theory. Based on the correlation between scale inhibition abilities and interaction energies, we elucidated that the effective nonionic monomer of terpolymer for silica scale inhibition had low affinity for aluminum hydroxide and high affinity for H2O and Si(OH)3O-. The affinities of nonionic monomer for aluminum hydroxide and H2O suggested that there was proper conformation of polyelectrolyte adsorbed for effectively dispersing aluminum hydroxide. Also, high affinity of nonionic monomer for Si(OH)3O- suggested that interacting Si(OH)3O- is an important role of inhibition of silica scale formation.
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U2 - 10.1016/j.jcis.2011.04.025
DO - 10.1016/j.jcis.2011.04.025
M3 - Article
C2 - 21555135
AN - SCOPUS:79957848630
SN - 0021-9797
VL - 360
SP - 110
EP - 116
JO - Journal of Colloid And Interface Science
JF - Journal of Colloid And Interface Science
IS - 1
ER -