Application of some cationic pullulan and curdlan derivatives as flocculants in fungicides-containing wastewater purification.

Autor: Ghimici L; 'Petru Poni' Institute of Macromolecular Chemistry, 41A, Grigore Ghica Voda Alley, 700487 Iasi, Romania. Electronic address: lghimici@icmpp.ro., Nafureanu MM; 'Petru Poni' Institute of Macromolecular Chemistry, 41A, Grigore Ghica Voda Alley, 700487 Iasi, Romania., Constantin M; 'Petru Poni' Institute of Macromolecular Chemistry, 41A, Grigore Ghica Voda Alley, 700487 Iasi, Romania., Suflet DM; 'Petru Poni' Institute of Macromolecular Chemistry, 41A, Grigore Ghica Voda Alley, 700487 Iasi, Romania., Lopez-Maldonado EA; Faculty of Chemical Sciences and Engineering, Autonomous University of Baja, California, CP: 22424 Tijuana, Baja California, Mexico.
Jazyk: angličtina
Zdroj: International journal of biological macromolecules [Int J Biol Macromol] 2024 Dec; Vol. 283 (Pt 1), pp. 137408. Date of Electronic Publication: 2024 Nov 10.
DOI: 10.1016/j.ijbiomac.2024.137408
Abstrakt: The ability of some cationic pullulan (TMAP x -P) and curdlan (TMAP 0.4 -C) derivative to remove different fungicide particles from synthetic wastewater has been studied. Commercial fungicides formulations of different type, Bordeaux mixture (BM), Dithan M45 (Dt) and Melody Compact49 WG (MC) have been used. The influence of some parameters related to the dispersion characteristics (suspension pH and salinity) and the polysaccharide derivatives (polymer dose, the ionic groups content, flexibility) on the separation process have been assessed. All the polysaccharide samples revealed a good removal efficiency (RE%) for the fungicide formulations prepared in saltless aqueous solutions, namely between 94 and 98 % for BM, 81.5-85 % for Dt, 88-91 % for MC. Slightly higher residual fungicides absorbance percent values for the suspensions prepared in the presence of salts (up to 7 %) than those prepared in water have been noticed. Less amount of BM and MC particles were removed in acidic pH than in water and basic pH, while contrary results were recorded in case of Dt ones, irrespective of the flocculant used. However, the RE% values were located between 79 % and 98 % over the entirely suspension pH investigated. Both zeta potential and floc size measurements indicated the charge patch flocculation mechanism for the fungicide particles separation.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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