Kinetics, adsorption isotherms, thermodynamics, and desorption studies of cadmium removal from aqueous solutions using bamboo sawdust/rice husk biochar
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Date
2022
Journal Title
Journal ISSN
Volume Title
Publisher
Springer
Abstract
The adsorption mechanisms of Cd2+ removal from synthetic water using blended biochar from bamboo sawdust (BSD) and rice husk (RH) feedstocks at BSD/RH ratios 1:1, 1:3, and 3:1 were investigated. The equilibrium isotherms (Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich) and kinetics (pseudo-first order, pseudo-second order, Elovich, and intra-particle diffusion kinetic adsorption models) and thermodynamics were examined. The BSD/RH biochar ratio of 1:1, 1:3, and 3:1 produced the Cd2+ removal of 99.2%, 98.3%, and 97.24% respectively. The adsorption investigation found insignificant differences in removal efficiency across the biochar ratio combinations. Furthermore, the equilibrium isotherm analyses for the BSD/RH ratio of 3:1 and 1:1 are best described by in favor of the Freundlich model, whereas for BSD/RH biochar ratio of 1:3 best matched the Langmuir model. The thermodynamic study revealed that the process is non-spontaneous, endothermic, and dominated by the physisorption mechanism. Generally, physisorption was discovered to be the dominant process controlling the Cd2+ removal from the solution.
Description
Abstract.
Full Text Article is available at https://link.springer.com/article/10.1007/s13399-022-03472-3
Keywords
Kinetics, Adsorption isotherms, Thermodynamics, Aqueous solutions, Bamboo sawdust, Blended biochar, Rice husk biochar, Synthetic water, Equilibrium isotherms, Rice Husk, RH, Adsorption mechanisms, Cadmium removal
Citation
Kwikima, M. M., Chebude, Y., & Meshesha, B. T. (2022). Kinetics, adsorption isotherms, thermodynamics, and desorption studies of cadmium removal from aqueous solutions using bamboo sawdust/rice husk biochar. Biomass Conversion and Biorefinery, 1-13.