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Article

Selective and Competitive Adsorption of Anions in Solution on Porous Adsorbent from Zea mays Steams: Kinetic and Equilibrium Study

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Process Design and Biomass Utilization Research Group (IDAB), Chemical Engineering Department, Engineering Faculty, Universidad de Cartagena, Avenida del Consulado St. 30, Cartagena de Indias 130015, Colombia
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Food Packaging and Shelf Life Research Group (FP&SL), Food Engineering Department, Engineering Faculty Universidad de Cartagena, Avenida del Consulado St. 30, Cartagena de Indias 130015, Colombia
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Authors to whom correspondence should be addressed.
Academic Editor: Tushar Kanti Sen
Water 2022, 14(18), 2906; https://doi.org/10.3390/w14182906
Received: 6 July 2022 / Revised: 7 September 2022 / Accepted: 15 September 2022 / Published: 17 September 2022
(This article belongs to the Special Issue Solid/Liquid Adsorption in Water and Wastewater Treatment)
Surface modification can improve the adsorption capacity of biochar. Biochar was produced from corn stalks (Zea mays) by pyrolysis at 520 °C, activated with sulfuric acid (H2SO4) using impregnation ratios of biomass weight: volume 1:2 (B 1:2) and 1:3 (B 1:3). The kinetic study showed that the equilibrium is reached at 180 min; the maximum adsorption capacity of nitrate and sulphate was obtained with B 1:2 and for phosphate with B 1:3. The adsorption of nitrate and phosphate with the two biochars presented a good fitting to the pseudo-first order and pseudo-second-order model, while that of sulphate for B 1:2 is described by Elovich’s model. Freundlich’s model describes the equilibrium of adsorption of nitrate and phosphate using B 1:2 and B 1:3, while Dubinin–Radushkevich adjusts the removal of sulphate for C 1:2 and C 1:3; therefore it is suggested that adsorption occurs in multilayers. The multicomponent study evidences the preference of biocarbon for phosphate, without indicating competition for the active centers of the material among the anions studied. View Full-Text
Keywords: corn-derived biochar; modified biochar; nitrate; phosphate; sulphate corn-derived biochar; modified biochar; nitrate; phosphate; sulphate
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MDPI and ACS Style

Villabona-Ortíz, A.; Ortega-Toro, R.; Tejada-Tovar, C. Selective and Competitive Adsorption of Anions in Solution on Porous Adsorbent from Zea mays Steams: Kinetic and Equilibrium Study. Water 2022, 14, 2906. https://doi.org/10.3390/w14182906

AMA Style

Villabona-Ortíz A, Ortega-Toro R, Tejada-Tovar C. Selective and Competitive Adsorption of Anions in Solution on Porous Adsorbent from Zea mays Steams: Kinetic and Equilibrium Study. Water. 2022; 14(18):2906. https://doi.org/10.3390/w14182906

Chicago/Turabian Style

Villabona-Ortíz, Angel, Rodrigo Ortega-Toro, and Candelaria Tejada-Tovar. 2022. "Selective and Competitive Adsorption of Anions in Solution on Porous Adsorbent from Zea mays Steams: Kinetic and Equilibrium Study" Water 14, no. 18: 2906. https://doi.org/10.3390/w14182906

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