A novel nanobiosorbent of functionalized graphene quantum dots from rice husk with barium hydroxide for microwave enhanced removal of lead (II) and lanthanum (III). (February 2020)

• Record Type: Journal Article
• Authors: Mahmoud, Mohamed E.; Fekry, Nesma A.; Abdelfattah, Amir M.
• Is Part Of: Bioresource technology. Volume 298(2020)
• Publication Date: 2020-02
• Subjects: Graphene quantum dots -- Rice husk -- Barium hydroxide -- Removal -- Lead (II) and lanthanum (III); Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2019.122514
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Graphene Quantum Dots-Barium hydroxide has been synthesized. Ultrafast removal of Pb(II) and la(III) by microwave irradiation technique. Maximum removal of Pb(II) and La(III) at 15 s. Adsorption isotherms, kinetics and thermodynamic parameters were investigated. Excellent removal of Pb(II) and La(III) ions from wastewater and tap water. Abstract: 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)2 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 −1 (pH 7), and 1500 µmol g −1 (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%).