A novel nanobiosorbent of functionalized graphene quantum dots from rice husk with barium hydroxide for microwave enhanced removal of lead (II) and lanthanum (III).

Author(s) Mahmoud, M.E.; Fekry, N.A.; Abdelfattah, A.M.
Journal Bioresour Technol
Date Published 2020 Feb

In this study, rice husk was used as a sustainable source to synthesize graphene quantum dots (GQDOs) with 2D morphology. Chemical modification of GQDOs with Ba(OH) was followed to form a novel GQDOs-Ba nanobiosorbent with an increased number of surface hydroxyl groups. The physicochemical properties of GQDOs and GQDOs-Ba were investigated by FT-IR, SEM, TEM, TGA, and XRD. The adsorption parameters of Pb(II) and La(III) onto GQDOs-Ba were optimized using microwave sorption approach. The maximum capacity reached 3400 µmol g (pH 7), and 1500 µmol g (pH 5) at 15 s for Pb(II) and La(III), respectively. The adsorption isotherm models by GQDOs-Ba fitted well with Langmuir. The pseudo-second order was agreed by Pb(II) and La(III) ions. The thermodynamic studies elucidated that Pb(II) and La(III) adsorption onto GQDOs-Ba followed a spontaneous model. The GQDOs-Ba nanobiosorbent accomplished excellent removal percentages from different water samples containing lead (98.5%-99.8%) and lanthanum (94.6%-96.2%).

DOI 10.1016/j.biortech.2019.122514
Keywords Adsorption; Barium Compounds; Graphite; Hydrogen-Ion Concentration; Kinetics; Lanthanum; Lead; Microwaves; Oryza; Quantum Dots; Spectroscopy, Fourier Transform Infrared; Water Pollutants, Chemical
ISSN 1873-2976
Citation Bioresour Technol. 2020;298:122514.

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