Abstract
In this study, lemon peel biochar is used as an adsorbent to remove chromium (VI) and Acid Orange 7 in acidic and basic solutions. Physicochemical properties of the biochar are investigated using FESEM, RAMAN, FTIR, BET, XRD, and EDAX analyzes. The optimal design technique such as response surface method is used to investigate the effect of adsorption parameters for experiment. Optimization of effective parameters, including the initial concentration of pollutant, adsorbent concentration, contact time, and solution pH, is investigated. Under optimal conditions of the initial concentration of Cr (VI) = 50 mg/L, pH = 2, biochar dosage = 0.2 g/L, and the contact time = 120 min, the maximum adsorption capacity of about 41.65 mg/g is obtained. Also, the maximum adsorption capacity of Acid Orange 7 is obtained 225 mg/g under the optimal conditions of initial Acid Orange 7 concentration = 100 mg/L, pH = 2, biochar dosage = 0.2 g/L, and the contact time = 90 min. Langmuir isotherm (R2 = 0.95 and R2 = 0.99) and pseudo-second-order kinetic (R2 = 0.98 and R2 = 0.99) are best fitted with the experimental data suggesting multilayer adsorption with chemical interactions between pollutants and biochar surface. Therefore, the lemon peel biochar can be used as an effective adsorbent for the adsorption of chromium (VI) and Acid Orange 7 in acidic and basic solutions.
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Ahmadian, A., Goharrizi, B.A., Shahriari, T. et al. Adsorption of chromium (VI) and Acid Orange 7 on lemon peel biochar: a response surface methodology approach. Int. J. Environ. Sci. Technol. 20, 2939–2958 (2023). https://doi.org/10.1007/s13762-022-04726-3
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DOI: https://doi.org/10.1007/s13762-022-04726-3