Sulfonated Graphene – An Efficient Cationic Dye Adsorbent In Aqueous Solution
Smriti Arora, Ritika Nagpal, Sweta Mishra, SMS Chauhan
Volume 2, Issue 11, Page 704-710, Year 2017 | DOI: 10.5185/amp.2018/728
Keywords: Sulfonated reduced graphene oxide, rhodamine B, methylene blue, methyl orange, waste water treatment.
Abstract: A fast, sensitive, label-free, and organic cationic dye adsorbent has been developed by hydrothermal sulfonation reaction on reduced graphene oxide. The layered graphene sheet provides a significant surface area, high intrinsic mobility while presence of –SO3H groups on both sides of sheet render strong hydrophilicity and good dispersibility in water. The dye adsorption process is followed using UV–Visible spectroscopy, while the material before and after adsorption has been characterized by Raman, Powder XRD, FT-IR, TGA, TEM, SEM analysis. Optimum experimental parameters were determined to be acidic for Rhodamine B (RB) and basic for Methylene Blue (MB), temperature 30°C, adsorbent dosage 50 mg/L. The sorption equilibrium data were modeled using various isotherms, where the data best fitted to Freundlich isotherm for RB (qmax = 76.68 mg/g), while Langmuir isotherm for MB (qmax = 564.97 mg/g). The results indicate that the heterogeneous adsorbent can be applied for efficient dye removal from industrial effluent and contaminated natural water. Copyright © 2017 VBRI Press.