title: Cationic polyelectrolyte induced separation of some inorganic contaminants and their mixture (zirconium silicate, kaolin, K-feldspar, zinc oxide) as well as of the paraffin oil from water.
abstract: The flocculation efficiency of a cationic polyelectrolyte with quaternary ammonium salt groups in the backbone, namely PCA5 was evaluated on zirconium silicate (kreutzonit), kaolin, K- feldspar and zinc oxide (ZnO) suspensions prepared either with each pollutant or with their mixture. The effect of several parameters such as settling time, polymer dose and the pollutant type on the separation efficacy was evaluated and followed by optical density and zeta potential measurements. Except for ZnO, the interactions between PCA5 and suspended particles led to low residual turbidity values (around 4% for kreutzonit, 5% for kaolin and 8% for K-feldspar) as well as to the reduction of flocs settling time (from 1200 min to 30 min and 120 min in case of kaolinit and K-feldspar, respectively), that meant a high efficiency in their separation. The negative value of the zeta potential and flocs size measurements, at the optimum polymer dose, point to contribution from charge patch mechanism for the particles flocculation. A good efficiency of PCA5 in separation of paraffin oil (a minimum residual turbidity of 9.8%) has been also found.
authors.affiliation: "Petru Poni" Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda, 41A, 700487 Iasi, Romania. Electronic address: lghimici@icmpp.ro.
authors.forename: Luminita
authors.initials: L
authors.lastname: Ghimici
mesh_terms: D000538:Aluminum Silicates / Q000032:analysis / Q000737:chemistry; D005427:Flocculation; D007616:Kaolin / Q000032:analysis / Q000737:chemistry; D009821:Oils / Q000032:analysis / Q000737:chemistry; D010232:Paraffin / Q000032:analysis / Q000737:chemistry; D011073:Polyamines / Q000737:chemistry; D000071228:Polyelectrolytes; D011108:Polymers / Q000737:chemistry; D017680:Potassium Compounds / Q000032:analysis / Q000737:chemistry; D000644:Quaternary Ammonium Compounds; D017640:Silicates / Q000032:analysis / Q000737:chemistry; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*; D015034:Zinc Oxide / Q000032:analysis / Q000737:chemistry; D015040:Zirconium / Q000032:analysis / Q000737:chemistry
chemical_list: D000538:Aluminum Silicates; D007616:Kaolin; D009821:Oils; D010232:Paraffin; D011073:Polyamines; D000071228:Polyelectrolytes; D011108:Polymers; D017680:Potassium Compounds; D000644:Quaternary Ammonium Compounds; D017640:Silicates; D014867:Water; D014874:Water Pollutants, Chemical; D015034:Zinc Oxide; D015040:Zirconium; C016447:feldspar; C003784:zircon; C015418:paraffin oils
keywords: Cationic polyelectrolyte; Flocculation; Pollutants mixture; Turbidity; Zeta potential