Year-end Sale % OFF 
Abstract
Current analysis investigates the capacity of the acai endocarp ( Euterpe oleracea M.) as a biosorbent for the removal of Cu 2+ and Zn 2+ in monoelementary water solutions. The best conditions for the ion adsorption process were pH of the solution at 4.0; 8 g L -1 of the biosorbent mass per volume of solution; best equilibrium time at 60 min. The application of kinetic models suggests that chemosorption may be the main limiting stage for metal ion adsorption. In the case of adsorption isotherms, Langmuir´s model had the best adjustment for biosorption and indicated adsorption in monolayers. A strong interaction of metals with the surface of the adsorbent was indicated due to low elution rates. Thermodynamic parameters showed that the biosorption process was spontaneous and endothermal. Results demonstrated that the use of the acai endocarp as biosorbent is an alternative for the remediation of Cu 2+ and Zn 2+ contaminated waters since it is a natural, low-cost and highly available material.
Highlights
Heavy metals, highlighted among the several contaminating factors of water resources, are toxic, contaminating and non-biodegradable elements released in the water medium as products of industrial and agricultural activities
The above results confirm data obtained by the pseudosecond order model and indicate predominance of chemosorption (Liu et al, 2013)
With regard to the intraparticle diffusion model, there is an increase in Kid rates related to straights lines A and B for the metal ion Cu2+, whereas these rates decrease for metal ion Zn2+, which showed that the diffusion rate was lower in the latter phase, mainly due to the decrease in active sites for the adsorption of this metal ion
Summary
Heavy metals, highlighted among the several contaminating factors of water resources, are toxic, contaminating and non-biodegradable elements released in the water medium as products of industrial and agricultural activities. Due to intense pollution and contamination, water constantly requires new de-pollutant technologies so that it could be used and reused as a resource (Mimura, Vieira, Martelli, & Gorgulho, 2010). Several methods, such as coagulation, flocculation, ion exchange, separation by membranes and chemical precipitation, have been employed to remove metal ions from water solutions. Their main disadvantages are high costs and technical limitations. The interest in the development of alternative low cost and efficient technologies is highly relevant. Biosorption is an emergent, competitive and sustainable technology (Gonçalves et al, 2013a; 2013b; Rubio et al, 2013a; 2013b; Coelho et al, 2014, Schwantes et al, 2015a; 2015b; Nacke et al, 2016)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
