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Physicochemical Approach to Alkaline Flocculation of Chlorella vulgaris Induced by Calcium Phosphate Precipitates.

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    SYSNO ASEP0487866
    Druh ASEPJ - Článek v odborném periodiku
    Zařazení RIVJ - Článek v odborném periodiku
    Poddruh JČlánek ve WOS
    NázevPhysicochemical Approach to Alkaline Flocculation of Chlorella vulgaris Induced by Calcium Phosphate Precipitates.
    Tvůrce(i) Brányiková, Irena (UCHP-M) RID, ORCID, SAI
    Filipenská, Monika (UH-J) ORCID, RID
    Urbanová, K. (CZ)
    Růžička, Marek (UCHP-M) RID, ORCID, SAI
    Pivokonský, Martin (UH-J) SAI, ORCID, RID
    Brányik, T. (CZ)
    Zdroj.dok.Colloids and Surfaces B-Biointerfaces. - : Elsevier - ISSN 0927-7765
    Roč. 166, June 1 (2018), s. 54-60
    Poč.str.7 s.
    Jazyk dok.eng - angličtina
    Země vyd.NL - Nizozemsko
    Klíč. slovamicroalgae ; calcium phosphate ; precipitates ; surface interactions
    Vědní obor RIVCI - Průmyslová chemie a chemické inženýrství
    Obor OECDChemical process engineering
    Vědní obor RIV – spolupráceÚstav pro hydrodynamiku - Mechanika tekutin
    CEPGA18-05007S GA ČR - Grantová agentura ČR
    Institucionální podporaUCHP-M - RVO:67985858 ; UH-J - RVO:67985874
    UT WOS000432505900008
    EID SCOPUS85043395266
    DOI10.1016/j.colsurfb.2018.03.007
    AnotaceAlkaline flocculation has been studied due to its potential as a low-cost harvesting method for microalgae. However, surface properties (zeta potential, contact angles) as inputs into physicochemical interaction models have not yet been applied systematically. In this work, forced alkaline flocculation of the freshwater microalgae Chlorella vulgaris induced by calcium phosphate precipitates was studied as a model system. Response surface methodology was used to quantify the effect of independent variables (concentration of Ca2+ (0.5 − 0.5 mM) and PO43− (0.05 − 0.35 mM, pH (8 − 12) and ionic strength (1 − 19 mM) on the zeta potential (ZP) of microalgae, and the turbidity (T) of inorganic precipitates. Flocculation tests and their modified versions were carried out. The flocculation efficiencies obtained were interpreted with respect to predictions of physicochemical interaction models. It was found that flocculation was possible under conditions where appropriate precipitates were formed in the presence of cells. Under these conditions, flocculation of negatively charged Chlorella vulgaris was induced not only by positively charged, but also by negatively charged calcium phosphate precipitates at an early phase of nucleation. The driving force for interactions between oppositely charged cells and precipitate particles was electrostatic attraction, while the attraction between equally charged entities may have resulted from a negative total balance of apolar (Lifsitz-van der Waals) and polar (acid-base) interactions. Medium components did not interfere with flocculation, while cellular organic matter decreased flocculation efficiency only to a very limited extent.
    PracovištěÚstav chemických procesů
    KontaktEva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227
    Rok sběru2019
Počet záznamů: 1