Abstract
The combined adsorption of Cr (III) ions and halides from aqueous solution using orange peels as adsorbent was modeled. Orange peels as adsorbent is resource-saving, and has environmental friendly behavior. The influence of initial pH, initial solution ion concentration, adsorbent dosage, halides and temperature on the adsorption efficiency was studied using batch equilibrium assays. Results showed that, adsorption of Cr (III) ions increases with decrease in initial pH (maximum at 2), increasing initial solution concentration, increasing peels dosage, absence of halides and decreasing temperature. Among the tested i»?isotherm i»?models, the Freundlich isotherm best modeled both adsorptions without and with presence of halides. Some thermodynamic parameters; ΔG, ΔH, A, ΔHr and ΔS were calculated from the experimental data, with the result showing that the adsorption process is feasible, spontaneous and follow physisorption mechanism. Thus, orange peel is effective in the sorption of chromium (III) ions from aqueous solution.
Highlights
The problems of the ecosystem are increasing with developing technology; heavy metals pollution is one of the main problems [1]
Adsorption isotherm models The equilibrium models that was used in describing the adsorption isotherms for this research include; Linear, Freundlich, Langmuir and Temkin isotherm models
This work described the sorption of Chromium (III) ions from aqueous solution using orange peels in the absence and presence of halides
Summary
The problems of the ecosystem are increasing with developing technology; heavy metals pollution is one of the main problems [1]. The earth’s waters may contain various toxic metals [1]. Water pollution raises a great concern nowadays since water constitutes a basic necessity in life and is essential to all living things. In developing countries such as Nigeria, industries such as metal mining operations, fertilizers and paper industries and pesticides majorly contribute to the pollution of the ecosystem through the discharge of industrial effluents into the water system. Water contamination by heavy metals is more pronounced than other pollutants exposed to the natural ecosystem. “Heavy metals” refers to any element with atomic number between 63.5 and 200.6 and a specific gravity greater than 5.0 [1,2]
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