Removal of copper(II) ions and lead(II) from aqueous solutions using seeds of Azadirachta indica A. Juss as bioadsorvent.

Removal of copper(II) ions and lead(II) from aqueous solutions using seeds of Azadirachta indica A. Juss as bioadsorvent. Environ Res. 2020 Feb 08;183:109213 Authors: Costa WD, da Silva Bento AM, de Araújo JAS, Menezes JMC, da Costa JGM, da Cunha FAB, Coutinho HDM, de Paula Filho FJ, Pereira Teixeira RN Abstract In recent decades, aquatic environment pollution has become a global challenge due to a rapid industrial growth. In this context, adsorption has become one of the most used methods, gaining importance especially in the last decades, given the growing concern over environmental damages caused by these pollutants. Additionally, its low cost and bioavailability are attractive. Therefore, the present study proposed to investigate the adsorption potential of A. indica seeds for Cu(II) and Pb(II) removal in synthetic solutions. Equilibrium studies were carried out via isothermal adsorption in batch systems. Kinetic studies were used to evaluate the lowest equilibrium time. The two evaluated ions were better suited to the Langmuir model and Freundlich model. When applying Langmuir's model on Neem seed powder adsorption, maximum adsorption capacities of 11.54 mg g-1 and 17.96 mg g-1, in the crude form and 11.41 mg g-1 and 19.80 mg g-1 in the alkaline form were obtained for Cu(II) and Pb(II) ions, respectively. The equilibrium time was approximately 80 and 100 min for both ions. The kinetic model best adjusted to the phenome...
Source: Environmental Research - Category: Environmental Health Authors: Tags: Environ Res Source Type: research