Abstract
This study reports the potential ability of biochar derived from the leaf of Leersia hexandra Swartz (BLLH) for biosorption of Cr(VI) from aqueous solutions. FTIR spectra of the biosorbent confirmed that functional groups of OH, C–H, –CH2, C=C, and C–O were mainly responsible for chromium removal. The percentage removal and the biosorption capacity were 99.65% and 24.91 mg/g, respectively, at the solution pH of 1.0 and decreased as the solution pH increased. The extent of Cr(VI) removal by the biosorbent increased sharply at the initial 20 min and reached a saturation. Biosorption of Cr(VI) was observed to be 8.60–349.81 mg/g when the initial Cr concentrations were 20–1000 mg/L and the solution pH were 5.0. The biosorption kinetics was found to follow the pseudo-second-order model, and the experimental equilibrium biosorption data fitted reasonably well to Freundlich isotherm. The results indicated that BLLH can be used as an effective and low-cost biosorbent for the removal of Cr(VI) from aqueous solutions.
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Acknowledgements
The project was supported by Natural Science Foundation of Guangxi (2013GXNSFEA053002), the Special Funding for Guangxi ‘BaGui scholars’ Construction Projects, Natural Science Foundation of China (41273142), and the Guangxi Talent Highland for Hazardous Waste Disposal Industrialization. The authors are grateful to the anonymous reviewers for valuable comments on the manuscript.
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Zhang, X., Zhang, X. & Chen, Z. Biosorption of Cr(VI) from aqueous solution by biochar derived from the leaf of Leersia hexandra Swartz. Environ Earth Sci 76, 67 (2017). https://doi.org/10.1007/s12665-016-6336-4
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DOI: https://doi.org/10.1007/s12665-016-6336-4