A systematic study for the characterization of a novel coagulant(polyaluminium silicate chloride)
The current research in coagulation–flocculation field has focused mainly in understanding the behavior and chemistry of pre-polymerized coagulants, such as polyaluminium chloride (PACl), and the improvement of their properties.Apossibleway to increase the efficiency of PACl is claimed to be the incorporation of silica in its structure, in the form of polysilicates. The newproduct is called polyaluminium silicate chloride(PASiC) and is supposed to be more effective than PACl, when applied in the coagulation–flocculation process. The purpose of this study was the synthesis and characterization of many possible derivatives of polyaluminium silicate chloride, based on different basicity (OH/Al molar ratio), silica content (Al/Si molar ratio) and preparation method (co-polymerization or composite polymerization) to get an overall picture of their major physico-chemical properties. Overall 32 silica based coagulants were prepared with different OH/Al (1–2.5) and Al/Si (5–20) ratios. Their properties were mainly evaluated by means of polymerization degree and aluminium species distribution employing either the ferron technique or the 27Al NMR method, in order to evaluate the impact of silica addition in the new coagulants. Moreover, the formation of new species was investigated with the use of X-ray diffraction, FTIR, and SEM methods. Finally, their stability was investigated over a time period of several months.
Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης, Σχολή Θετικών Επιστημών, Τμήμα Χημείας
Colloids and Surfaces A: Physicochemical and Engineering Aspects, vol.342, no.1-3 p.30-39 [Published Version]
This record is part of 'IKEE', the Institutional Repository of Aristotle University of Thessaloniki's Library and Information Centre found at http://ikee.lib.auth.gr. Unless otherwise stated above, the record metadata were created by and belong to Aristotle University of Thessaloniki Library, Greece and are made available to the public under Creative Commons Attribution-ShareAlike 4.0 International license (http://creativecommons.org/licenses/by-sa/4.0).
Unless otherwise stated in the record, the content and copyright of files and fulltext documents belong to their respective authors. Out-of-copyright content that was digitized, converted, processed, modified, etc by AUTh Library, is made available to the public under Creative Commons Attribution-ShareAlike 4.0 International license (http://creativecommons.org/licenses/by-sa/4.0). You are kindly requested to make a reference to AUTh Library and the URL of the record containing the resource whenever you make use of this material.
*Η εύρυθμη και αδιάλειπτη λειτουργία των διαδικτυακών διευθύνσεων των συλλογών (ψηφιακό αρχείο, καρτέλα τεκμηρίου στο αποθετήριο) είναι αποκλειστική ευθύνη των αντίστοιχων Φορέων περιεχομένου.