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Adsorption behavior of Congo red dye from aqueous solutions onto exfoliated graphite as an adsorbent: Kinetic and isotherm studies

2019; Elsevier BV; Volume: 18; Linguagem: Inglês

10.1016/j.matpr.2019.07.414

2214-7853

Thinh Van Pham, Thuan Van Tran, Trinh Duy Nguyen, Nguyễn Thị Thắm, Phan Thanh Tri Quang, Dao Thi To Uyen, Le Thi Hong Nhan, Dai‐Viet N. Vo, Trung Thanh Nguyen, Long Giang Bạch,

Graphene research and applications

Herein, we reported a facile method to fabricate the exfoliated graphite (EG) by Hummer's method via a two-step procedure including intercalation with a mixture of oxidants (H2O2 and H2SO4), and exfoliation using a microwave system. For the adsorption experiments, effect of contact time (0–210 min), initial concentration (20–60 mg/L), pH (4–10), and EG dosage (0.3–0.7 g/L) were systematically studied. Moreover, the adsorption kinetics (pseudo-first-order, pseudo-second-order, Elovich, and Bangham) and isotherms (Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich) were carried out to elucidate the mechanism of CR adsorption over EG. Due to high porosity (40.95 m2/g) and large maximum adsorption capacity of CR (80.775 mg/g), the EG derived from natural graphite can be an effective adsorbent for CR dye treatment in aqueous solution.