Removal studies of Cr2O3 colloidal particles using cationic poly(L-lysine) and its block copolymers with poly(ethylene glycol)

被引:5
|
作者
Ostolska, Iwona [1 ]
Wisniewska, Malgorzata [1 ]
机构
[1] Marie Curie Sklodowska Univ, Fac Chem, Dept Radiochem & Colloids Chem, Maria Curie Sklodowska Sq 3, PL-20031 Lublin, Poland
关键词
Adsorption; Block copolymers; Chromium(III) oxide removal; polyamino acids; Suspension stability; Zeta potential; OXIDE NANOPARTICLES; POLYASPARTIC ACID; SURFACE MODIFICATION; SORPTION PROPERTIES; POLY(AMINO ACID)S; FUNCTIONAL-GROUPS; ADSORPTION; DEHYDROGENATION; DISPERSION; LAYER;
D O I
10.1016/j.molliq.2017.06.100
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Cr2O3 dispersions are considered to be dangerous for aqueous ecosystems and for this reason it is necessary to develop methods allowing solid particles separation. Structure of the adsorption layer formed at the solid surface determines the colloidal suspension stability. Moreover, in the case of ionic polymers the solution pH considerably affects the chains arrangement. Hence, the influence of cationic poly(L-lysine) and its copolymers adsorption on the chromium(III) oxide (Cr2O3) particles stability was investigated. Although the analyzed substances are characterized by the similar average molecular weight, they exhibit various macromolecular structures resulting from the different PEG and polyamino acid length ratios. The sample's stability was examined by the use of the turbidimetric method enabling the Turbiscan Stability Index (TSI) parameter calculation. As one can see, solid suspensions without the tested polymers are relatively unstable. At pH 4, introduction of the cationic macromolecules causes the increase in the sample stability. This can be explained by the electrostatic repulsion between the totally ionized polymeric chains adsorbed on the adjacent Cr2O3 particles. At pH(pzs) changes in the TSI values are related to the different polymer chain arrangements. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:952 / 958
页数:7
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