Optimization and kinetic modeling of cadmium desorption from citrus peels: a process for biosorbent regeneration

Journal of Hazardous Materials
Eloh Njikam, Silke Schiewer

Abstract

Citrus peel biosorbents are efficient in removing heavy metals from wastewater. Heavy metal recovery and sorbent regeneration are important for the financial competitiveness of biosorption with other processes. The desorbing agents HNO(3), NaNO(3), Ca(NO(3))(2), EDTA, S, S-EDDS, and Na-Citrate were studied at different concentrations to optimize cadmium elution from orange or grapefruit peels. In most cases, desorption was fast, being over 90% complete within 50 min. However sodium nitrate and 0.001 M nitric acid were less efficient. Several new models for desorption kinetics were developed. While zero-, first- and second-order kinetics are commonly applied for modeling adsorption kinetics, the present study adapts these models to describe desorption kinetics. The proposed models relate to the number of metal-filled binding sites as the rate-determining reactant concentration. A model based on first order kinetics with respect to the remaining metal bound performed best. Cd bound in subsequent adsorption after desorption was similar to the original amount bound for desorption by nitric acid, but considerably lower for calcium nitrate as the desorbent. While complexing agents were effective desorbents, their cost is higher than ...Continue Reading

References

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Citations

Aug 12, 2014·BioMed Research International·Hanan E M El-Sayed, Mayyada M H El-Sayed
Jun 21, 2015·Journal of Hazardous Materials·Z S Birungi, E M N Chirwa
Jun 1, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·S IndahA Binuwara
Jan 1, 2014·International Scholarly Research Notices·Sachin C Gondhalekar, Sanjeev R Shukla
Sep 3, 2020·Environmental Science and Pollution Research International·Zeinab M El-BouhyFify N Gomaa
Feb 3, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Hadis Bashiri, Alireza Hassani Javanmardi

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