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

SYSNO ASEP	0487866
Druh ASEP	J - Článek v odborném periodiku
Zařazení RIV	J - Článek v odborném periodiku
Poddruh J	Článek ve WOS
Název	Physicochemical 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. slova	microalgae ; calcium phosphate ; precipitates ; surface interactions
Vědní obor RIV	CI - Průmyslová chemie a chemické inženýrství
Obor OECD	Chemical process engineering
Vědní obor RIV – spolupráce	Ústav pro hydrodynamiku - Mechanika tekutin
CEP	GA18-05007S GA ČR - Grantová agentura ČR
Institucionální podpora	UCHP-M - RVO:67985858 ; UH-J - RVO:67985874
UT WOS	000432505900008
EID SCOPUS	85043395266
DOI	10.1016/j.colsurfb.2018.03.007
Anotace	Alkaline 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.
Pracoviště	Ústav chemických procesů
Kontakt	Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227
Rok sběru	2019

Počet záznamů: 1