Effect of solution pH on the stability of mixed silica -alumina suspension in the presence of polyacrylic acid (PAA) with different molecular weights

• Autorzy: Małgorzata Wiśniewska , Konrad Terpiłowski , Stanisław Chibowski , Teresa Urban , Vladimir Zarko , Vladimir Gun’ko
• Języki publikacji: EN

Abstrakty

EN

The influence of solution pH (in the range 3–9) on mixed silica-alumina suspension in the absence and presence of polyacrylic acid (PAA) was studied. The composition of the adsorbent was SiO2 (97%) and Al2O3 (3%). The turbidimetry method was applied to record changes in the stability of the investigated systems as a function of time. It was shown that the suspension without the polymer is less stable at pH 3, whereas at pH 6 and 9, the systems were stable. PAA with molecular weights 100 000 and 240 000 at pH 3 (improvement of system stability conditions) and PAA 2 000 at pH 6 (deterioration of suspension stability) have a great effect on the silica-alumina suspension stability. The stabilization-flocculation properties of polyacrylic acid are a result of a specific conformation of its chains on the solid surface where it depends on the solution pH and the polymer molecular weight.

Słowa kluczowe

EN

Polyacrylic acid; Mixed silica-alumina; Suspension stability; Turbidimetry; Macromolecule conformation

• Czasopismo: Open Chemistry
• Rocznik: 2013
• Tom: 11
• Numer: 1
• Strony: 101-110

Daty

wydano

2013-01-01

online

2012-10-24

Twórcy

autor

Małgorzata Wiśniewska

• Maria Curie Skłodowska University,

autor

Konrad Terpiłowski

• Maria Curie Skłodowska University

autor

Stanisław Chibowski

• Maria Curie Skłodowska University

autor

Teresa Urban

• Maria Curie Skłodowska University

autor

Vladimir Zarko

• National Academy of Sciences of Ukraine

autor

Vladimir Gun’ko

• National Academy of Sciences of Ukraine

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Identyfikatory

DOI

10.2478/s11532-012-0136-9