Affiliation:
1. Departamento de Ingeniería Bioquímica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Av. Wilfrido Massieu s/n, Unidad Profesional Adolfo López Mateos, Ciudad de México 07738, Mexico
Abstract
There is a growing need for an economical and efficient method capable of removing heavy metals from residual water. The current contribution aimed to evaluate the capacity of onion peel, an abundant agroindustrial waste product, to remove divalent cobalt (Co2+) from aqueous solutions. Onion peel was submitted to proximal chemical analysis, and various operational factors involved in biosorption were tested. The most suitable temperature (30 °C), pH (7.0), and biosorbent particle size (300–800 µm) were found. With an initial Co2+ concentration of 380 mg L−1, the maximum capacity of Co2+ removal was 59.88 mg g−1 in 120 min. The pseudo-second order and Langmuir models provided the best fit to the experimental kinetics and equilibrium of Co2+ biosorption, respectively. The thermodynamic study evidenced an exothermic, non-spontaneous, and favorable reaction (ΔH0 = −5.78 kJ mol−1; ΔS0 = −21.13 J mol−1 K−1), suggesting the formation of stable bonds in the biosorbent-Co2+ complex. The carbonyl and hydroxyl groups apparently play a fundamental role in Co2+ removal, and electrostatic attraction, ion exchange, and chemisorption are the principal mechanisms. Thus, the biosorption of Co2+ by onion peel has potential as an economical, eco-friendly, efficient, and sustainable treatment for wastewater.
Funder
Instituto Politécnico Nacional, Secretaría de Investigación y Posgrado
Reference107 articles.
1. Toxic and Heavy Metals Contamination Assessment in Soil and Water to Evaluate Human Health Risk;Ahmad;Sci. Rep.,2021
2. Sobti, R.C., Arora, N.K., and Kothari, R. (2019). Heavy Metal Contamination: An Alarming Threat to Environment and Human Health. Environmental Biotechnology: For Sustainable Future, Springer.
3. Kumar, V., Sharma, A., and Cerdà, A. (2021). 10-Heavy Metal Contamination in Water and Its Possible Sources. Heavy Metals in the Environment, Elsevier.
4. Remediation of Potentially Toxic Elements -Containing Wastewaters Using Water Hyacinth—A Review;Galgali;Int. J. Phytoremediat.,2023
5. Current Advancement and Future Prospect of Biosorbents for Bioremediation;Singh;Sci. Total Environ.,2020