title: Development of a heavy metal sorption system through the P=S functionalization of coconut (Cocos nucifera) fibers.
abstract: Lignocellulosic residues are interesting materials for the production of heavy metal adsorbents for aquatic systems. Whole fibers taken from coconut (Cocos nucifera) husks were functionalized with the thiophosphoryl (P=S) group by means of the direct reaction with Cl(3)PS, (CH(3)O)(2)ClP=S or (CH(3)CH(2)O)(2)ClP=S in order to obtain an adsorptive system for 'soft' metal ions, particularly Cd(2+). These functionalized fibers (FFs) were characterized by means of elemental analysis, infrared spectroscopy, thermal analysis and acid-base titration. Adsorption isotherms for Cd(2+) fitted the Langmuir model, with binding capacities of 0.2-5 m mol g(-1) of FF at 25 degrees C.
authors.affiliation: Instituto de Química, Universidade de São Paulo, Av. Lineu Prestes 748 - r.1265, 05508-000 São Paulo, Brazil.
authors.forename: Dayane Almeida
authors.initials: DA
authors.lastname: de Sousa
authors.forename: Elisabeth
authors.initials: E
authors.lastname: de Oliveira
authors.forename: Márcio
authors.initials: M
authors.lastname: da Costa Nogueira
authors.forename: Breno Pannia
authors.initials: BP
authors.lastname: Espósito
mesh_terms: D000327:Adsorption; D003059:Cocos / Q000737:chemistry*; D003198:Computer Simulation; D019216:Metals, Heavy / Q000737:chemistry* / Q000302:isolation & purification*; D008956:Models, Chemical; D010936:Plant Extracts / Q000737:chemistry*; D014462:Ultrafiltration / Q000379:methods*
chemical_list: D019216:Metals, Heavy; D010936:Plant Extracts