Uso da casca de coco verde como adsorbente na remoção de metais tóxicos

Autor:	Morsyleide de Freitas Rosa, Sarah Abreu Moreira, André Gadelha de Oliveira, Ronaldo Ferreira do Nascimento, Francisco W. Sousa, Rivelino M. Cavalcante
Jazyk:	portugalština
Rok vydání:	2007
Předmět:	chemistry.chemical_classification Aqueous solution Base (chemistry) toxic metals Mineralogy General Chemistry chemistry.chemical_compound Adsorption chemistry Adsorption kinetics Wastewater green coconut shells Particle size Hydrogen peroxide Effluent wastewater Nuclear chemistry
Zdroj:	Química Nova, Volume: 30, Issue: 5, Pages: 1153-1157, Published: OCT 2007 Química Nova v.30 n.5 2007 Química Nova Sociedade Brasileira de Química (SBQ) instacron:SBQ
Popis:	Green coconut shells were treated with acid, base and hydrogen peroxide solutions for 3, 6, 12 and 24 h for removing toxic metals from synthetic wastewater. The removal of ions by the adsorbent treated with 0.1 mol L-1 NaOH/ 3h was 99.5% for Pb2+ and 97.9% for Cu2+. The removal of Cd2+, Ni2+, Zn2+, using adsorbent treated with 1.0 mol L-1 NaOH/3 h, was 98.5, 90.3 and 95.4%, respectively. Particle size, adsorbent concentration and adsorption kinetics were also studied. An adsorbent size of 60-99 mesh and a concentration of 30-40 g/L for 5 min exposure were satisfactory for maximum uptake of Pb2+, Ni2+, Cd2+, Zn2+ and Cu2+ and can be considered as promising parameters for treatment the aqueous effluents contaminated with toxic metals.
Databáze:	OpenAIRE
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