The use of green coconut shells as absorbents in the toxic metals

Quimica nova

Rosa, Morsyleide F.¹  Moreira, Sarah A.²  Cavalcante, Rivelino M.²  Sousa, Francisco W.²  Nascimento, Ronaldo F.²  Oliveira, André G.² 

[1] Embrapa Agroindústria Tropical-CE, Fortaleza, Brasil;Universidade Federal do Ceará, Fortaleza, Brasil

关键词: green coconut shells;    toxicmetals;    wastewater.;   

DOI  :  10.1590/S0100-40422007000500019

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

Green coconut shells were treated with acid,base and hydrogen peroxide solutions for 3, 6, 12 and 24 h for removing toxicmetals from synthetic wastewater. The removal of ions by the adsorbent treatedwith 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, 90.3and 95.4%, respectively. Particle size, adsorbent concentration and adsorptionkinetics were also studied. An adsorbent size of 60-99 mesh and a concentrationof 30-40 g/L for 5 min exposure were satisfactory for maximum uptake of Pb2+,Ni2+, Cd2+, Zn2+ and Cu2+ and canbe considered as promising parameters for treatment the aqueous effluents contaminatedwith toxic metals.

【 授权许可】

CC BY