Removal of Cu (II), Zn (II) and Ni (II) using açaí residue (Euterpe oleracea Mart.) as a biosorbent in aqueous solution

Abstract

Removal of Cu (II), Zn (II) and Ni (II) using açaí residue (Euterpe oleracea Mart.) as a biosorbent in aqueous solution Resumo Abstract: Removal of transition metal ions such as Cu(II), Zn(II) and Ni(II) from aqueous solutions was investigated using açaí residual biomass (Euterpe oleracea Mart.) as a biosorbent. The characterization of sample was performed by SEM/EDS image and point of zero charge (pH PCZ). The influence of pH, contact time and initial metal concentration was evaluated. The adsorption process was studied by the models of isotherms of Langmuir and Freundlich. The pseudo first and second order kinetic models were considered to interpret the experimental data. The maximum sorption capacity determined was 15.77, 24.69 and 3.30 mg g-1 , respectively for Cu(II), Zn(II) and Ni(II). The biosorption followed pseudo second order kinetic. The adsorption process of the Cu(II), Zn(II) and Ni(II) ions is favorable and spontaneous. A remoção de íons de metais de transição, como Cu(II), Zn(II) e Ni(II) em meio aquoso, foi investigado utilizando biomassa residual de açaí (Euterpe oleracea Mart.) como biossorvente. A caracterização da amostra foi efetuada por meio de análise de imagem MEV/EDS e pH PCZ. A influência do pH, do tempo de contato e da concentração inicial foram avaliadas. O processo de adsorção foi estudado pelos modelos de isotermas de Langmuir e Freundlich. Os modelos cinéticos de pseudo primeira ordem e pseudo segunda ordem foram considerados na interpretação dos dados experimentais. A capacidade máxima de adsorção determinada foi 15,77, 24,69 e 3,30 mg g-1 para os íons Cu(II), Zn(II) e Ni(II), respectivamente. A cinética de adsorção foi melhor descrita pelo modelo de pseudo segunda ordem. O processo de adsorção dos íons Cu(II), Zn(II) e Ni(II) é favorável e espontâneo.

Transformation of Residual Açai Fruit (Euterpe oleracea) Seeds into Porous Adsorbent for Efficient Removal of 2,4-Dichlorophenoxyacetic Acid Herbicide from Waters

“…The rest is generated byproducts, often inappropriately disposed of in the environment [23,24]. Due to these factors, some studies have analyzed the potential of this biomass as an adsorbent in the removal of caffeine [25], heavy metals [26][27][28][29], dyes [30,31], and phenol [32].…”