Nanoscale Pisum sativum pods biochar encapsulated starch hydrogel: A novel nanosorbent for efficient chromium (VI) ions and naproxen drug removal

• Published in: Bioresource technology Vol. 308; p. 123263
• Main Authors: Mohamed, Asmaa K., Mahmoud, Mohamed E.
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01-07-2020
• Subjects: Adsorption; Charcoal; Chromium; Chromium (VI); Hydrogels; Ions; Kinetics; Nanoscale biochar; Naproxen; Naproxen drug; Pisum sativum; Pisum sativum pods; Starch; Starch hydrogel; Water Pollutants, Chemical; Pisum sativum pods; Naproxen drug; Starch hydrogel; Chromium (VI); Nanoscale biochar
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2020.123263

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•N-PSPB/SHGL, a novel ecofriendly biochar-based starch hydrogel nanosorbent.•High capacities of Cr(VI) and naproxen as 420.13 and 309.82 mg/g, respectively.•Adsorption processes were fitted with various Kinetics and isotherm models.•Chromium (VI) removal mechanism was based on ion-pair formation and pore filling.•Pore filling, п-п interaction and H-bonding control the Naproxen adsorption.
Assembly of novel ecofriendly and sustainable (N-PSPB/SHGL) nanosorbent was fabricated based on encapsulation of derived nanoscale spherical biochar from Pisum sativum pods (N-PSPB) with starch hydrogel (SHGL). The mass ratio between starch and N-PSPB was examined and 2% (w/w) was selected as the optimum percentage for fabrication of the assembled hydrogel. High swelling capacity was characterized by N-PSPB/SHGL nanosorbent (500.0%) at room temperature (25 °C), excellent stability for ten cycles with respect to regeneration by 0.1 mol L−1 HCl. Additionally, characterizations of N-PSPB/Starch nanosorbent were established by SEM and BET measurement to characterize surface area (226.94 m2/g) and pore volume (9.88 cm3/g). The N-PSPB/SHGL nanosorbent was subjected to extensive investigations to evaluate its efficiency for removal of naproxen drug (NAP) and chromium (VI). The Cr(VI) and NAP drug adsorptions were fitted to pseudo-second kinetic and correlated with Langmuir isotherm. The adsorption processes were spontaneous and endothermic based on thermodynamic study.