Abstract
The antibiotic residue was used as a biosorbent for Cr (VI) aqueous solution to investigate its Cr (VI) removal capacity. The effect of experimental parameters, such as pH, sorbent dosage, initial metal concentration and contact time were examined and the optimal experimental conditions were determined. The results showed that 88.61 and 95.07% of Cr (VI) was removed by using the raw and acid-treated antibiotic residue powder as biosorbent. Maximum removal of Cr (VI) ions in aqueous solution was observed at pH 1.0. Biosorption kinetic data were properly fitted with the pseudo-first order kinetic model. The adsorption process followed the Langmuir isotherm adsorption model. Thermodynamic parameters of the adsorption process, such as ΔG°, ΔH° and ΔS°, were calculated and the results indicated that the overall adsorption process were feasible, spontaneous in nature. Finally, the removal mechanism is discussed by deduction from the experimental results, FTIR and SEM images. The adsorption of Cr (VI) coexists with the redox process and the antibiotic residue powder is a potential biosorbent which could be used in treatment of chromium contaminated wastewater.
Highlights
The recent rapid industrialization in China has lead to the release of huge amounts of industrial effluents into the environment and the heavy metals such as Cr, Cu, Pd, Ni, Zn and so forth, present in these effluents are more stable and persistent environmental contaminants; since they cannot be degraded or destroyed
Batch biosorption experiments: Adsorption of Cr (VI) by raw and acid-treated antibiotic residue was studied as a function of contact time, initial concentration of Cr (VI), biosorbent dose, pH and temperature
Characterization of the biosorbent: The physical and chemical properties of the raw and acid treated antibiotic residue were determined by the standard methods
Summary
The recent rapid industrialization in China has lead to the release of huge amounts of industrial effluents into the environment and the heavy metals such as Cr, Cu, Pd, Ni, Zn and so forth, present in these effluents are more stable and persistent environmental contaminants; since they cannot be degraded or destroyed. Different metal removal methods (chemical reduction and phytoremediation, reverse osmosis, precipitation, bioremediation, ion exchange, etc.) have been tested for detoxification of Chromium-laden waste waters in the recent years. They have high operating costs and problems in the disposal of the residual metal sludges. Adsorption isotherms and kinetic models were tested in order to have a better understanding of the biosorption process
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