Development of a heavy metal sorption system through the P=S functionalization of coconut (Cocos nucifera) fibers.
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.
de Sousa
Dayane Almeida
DA
Instituto de Química, Universidade de São Paulo, Av. Lineu Prestes 748 - r.1265, 05508-000 São Paulo, Brazil.
de Oliveira
Elisabeth
E
da Costa Nogueira
Márcio
M
Espósito
Breno Pannia
BP
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*
D019216:Metals, Heavy; D010936:Plant Extracts