caa a22 4500 463191706 CHVBK 20180406164911.0 cr unu---uuuuu 170326e20070801xx s 000 0 eng 10.1007/s10973-006-7619-x doi (NATIONALLICENCE)springer-10.1007/s10973-006-7619-x Study by thermal methods on the materials obtained by dye removal from waste waters with beech flour [Elektronische Daten] [Lucia Odochian, Viorica Dulman, M. Dumitraş, A. Pui] The study is devoted to the characterization by both TG-DTG analysis and FTIR spectroscopy of beech flour, dyes and the sorbent-dyes products obtained through retention of the dyes from aqueous solution on the beech flour, to the aim of obtaining information on the nature of dyes' retention, thermal behavior of the sorbent-dye materials as well as on their possible upgrading as fuel. Thermal analysis led to the conclusion that the mechanism of thermo-oxidative degradation is specific and the retention of dyes occurs on cellulose from beech flour. The nature of the bonds involved in dyes' retention is also investigated by FTIR analysis, which evidences that dyes retention on cellulose is realized through hydrogen bonding between the NH and, respectively, OH groups from dye molecule and the oxygen atoms from cellulose. Involvement of the non-participating electrons of the nitrogen and, respectively, oxygen atoms of these groups in the extended electronic conjugation with aromatic nuclei strongly influences the capacity of the amino and, respectively, hydroxyl groups of forming hydrogen bonds, thus achieving dyes fixation on the sorbent. DTA analysis led to the conclusion that an improvement in the quality of the sorbent-dye materials as fuels is possible, as compared to untreated beach flour, as a result of the modification of the cellulosic fibers in the process of dyes retention. Springer Science+Business Media LLC, 2007 beech flour nationallicence DTA nationallicence DTG nationallicence dye removal nationallicence FTIR nationallicence TG nationallicence thermal analysis nationallicence Odochian Lucia Faculty of Chemistry, The ‘Al. I. Cuza' University, 11 Carol I Bd., Iassy, Romania aut Dulman Viorica Faculty of Chemistry, The ‘Al. I. Cuza' University, 11 Carol I Bd., Iassy, Romania aut Dumitraş M. Faculty of Chemistry, The ‘Al. I. Cuza' University, 11 Carol I Bd., Iassy, Romania aut Pui A. Faculty of Chemistry, The ‘Al. I. Cuza' University, 11 Carol I Bd., Iassy, Romania aut Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 89/2(2007-08-01), 625-631 1388-6150 89:2<625 2007 89 10973 https://doi.org/10.1007/s10973-006-7619-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10973-006-7619-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Odochian Lucia Faculty of Chemistry, The ‘Al. I. Cuza' University, 11 Carol I Bd., Iassy, Romania aut NATIONALLICENCE 700 1- Dulman Viorica Faculty of Chemistry, The ‘Al. I. Cuza' University, 11 Carol I Bd., Iassy, Romania aut NATIONALLICENCE 700 1- Dumitraş M. Faculty of Chemistry, The ‘Al. I. Cuza' University, 11 Carol I Bd., Iassy, Romania aut NATIONALLICENCE 700 1- Pui A. Faculty of Chemistry, The ‘Al. I. Cuza' University, 11 Carol I Bd., Iassy, Romania aut NATIONALLICENCE 773 0- Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 89/2(2007-08-01), 625-631 1388-6150 89:2<625 2007 89 10973 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer