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Article

Rice Straw Biochar and Magnetic Rice Straw Biochar for Safranin O Adsorption from Aqueous Solution

by 1,† and 2,*,†
1
Department of Environmental Engineering, College of the Environment and Natural Resources, Can Tho University, Can Tho 900000, Vietnam
2
Department of Environmental Sciences, College of the Environment and Natural Resources, Can Tho University, Can Tho 900000, Vietnam
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Yongchang Sun
Water 2022, 14(2), 186; https://doi.org/10.3390/w14020186
Received: 3 December 2021 / Revised: 6 January 2022 / Accepted: 8 January 2022 / Published: 10 January 2022
This study investigates the adsorption of Safranin O (SO) from aqueous solution by both biochar and magnetic biochar derived from rice straw. Rice straw biochar (RSB) was made by pyrolysis in a furnace at 500 °C, using a heating rate of 10 °C·min−1 for 2 h in an oxygen-limited environment, whilst the magnetic rice straw biochar (MRSB) was produced via the chemical precipitation of Fe2+ and Fe3+. The physicochemical properties of the synthesized biochars were characterized using SEM, SEM- EDX, XRD, FTIR techniques, and N2 adsorption (77 K) and pHpzc measurements. Batch adsorption experiments were used to explore the effect of pH, biochar dosage, kinetics, and isotherms on the adsorption of SO. Experimental data of RSB and MRSB fit well into both Langmuir and Freundlich isotherm models, and were also well-explained by the Lagergren pseudo-second-order kinetic model. The maximum SO adsorption capacity of MRSB was found to be 41.59 mg/g, while for RSB the figure was 31.06 mg/g. The intra-particle diffusion model indicated that the intra-particle diffusion may not be the only rate-limiting step. The collective physical and chemical forces account for the adsorption mechanism of SO molecules by both RSB and MRSB adsorbents. The obtained results demonstrated that the magnetic biochar can partially enhance the SO adsorption capacity of its precursor biochar and also be easily separated from the solution by using an external magnet. View Full-Text
Keywords: adsorption; biochar; magnetic biochar; Safranin O; rice straw; aqueous solution adsorption; biochar; magnetic biochar; Safranin O; rice straw; aqueous solution
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MDPI and ACS Style

Phuong, D.T.M.; Loc, N.X. Rice Straw Biochar and Magnetic Rice Straw Biochar for Safranin O Adsorption from Aqueous Solution. Water 2022, 14, 186. https://doi.org/10.3390/w14020186

AMA Style

Phuong DTM, Loc NX. Rice Straw Biochar and Magnetic Rice Straw Biochar for Safranin O Adsorption from Aqueous Solution. Water. 2022; 14(2):186. https://doi.org/10.3390/w14020186

Chicago/Turabian Style

Phuong, Do T.M., and Nguyen X. Loc. 2022. "Rice Straw Biochar and Magnetic Rice Straw Biochar for Safranin O Adsorption from Aqueous Solution" Water 14, no. 2: 186. https://doi.org/10.3390/w14020186

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