Adsorption behavior of Congo red dye from aqueous solutions onto exfoliated graphite as an adsorbent: Kinetic and isotherm studies
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),...
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| Main Authors: | , , , , , , , , , |
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| Format: | Conference or Workshop Item |
| Language: | en |
| Published: |
Elsevier Ltd
2019
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| Subjects: | |
| Online Access: | https://umpir.ump.edu.my/id/eprint/46854/1/Adsorption%20behavior%20of%20Congo%20red%20dye%20from%20aqueous.pdf https://umpir.ump.edu.my/id/eprint/46854/ https://doi.org/10.1016/j.matpr.2019.07.414 |
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| Summary: | 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. |
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