4.3 Article

Kinetic studies of graphene oxide towards the removal of rhodamine B and congo red

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Publisher

TAYLOR & FRANCIS LTD
DOI: 10.1080/03067319.2019.1679802

Keywords

Graphene oxide; congo red; rhodamine B; adsorption; kinetic studies

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The batch adsorption experiments showed that the adsorption of rhodamine B and congo red onto graphene oxide increased with temperature, indicating an endothermic nature. The pseudo-second-order kinetics model was more suitable for describing the adsorption process, and the interaction between rhodamine B dye and graphene oxide resulted in higher adsorption capacity.
Batch adsorption experiments were performed to determine the effect of salt, temperature, initial dye concentration, contact time and adsorbent dosage on the removal of the rhodamine B and congo red dyes from aqueous solution on graphene oxide. It was observed that the adsorption of rhodamine B and congo red onto graphene oxide increased as the temperature was increased, indicating that adsorption is endothermic in nature. The equilibrium time for the removal of rhodamine B and congo red was observed to be 50 min and 120 min, respectively. The pseudo-first-order and pseudo-second-order equations were employed for the kinetics studies of adsorption to determine the rate-controlling step. The results showed that adsorption process followed the pseudo-second-order kinetics model. Further, it was noticed that the uptake of rhodamine B dye onto graphene oxide was greater than congo red due to the interaction between rhodamine B and graphene oxide. The regeneration tests indicated that the graphene oxide could be regenerated efficiently and used repeatedly.

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