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

Química Nova

Embrapa Agroindústria Tropical-CE, Fortaleza, Brasil¹  Moreira, Sarah A.¹  Cavalcante, Rivelino M.¹  Sousa, Francisco W.¹  Nascimento, Ronaldo F.¹  Oliveira, André G.¹  Rosa, Morsyleide F.¹  Universidade Federal do Ceará, Fortaleza, Brasil¹ 

关键词: green coconut shells;    toxic metals;    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 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.

【 授权许可】

Unknown