Sulfonated graphene – An efficient cationic dye adsorbent in aqueous solution

Smriti Arora, Ritika Nagpal, Sweta Mishra, SMS Chauhan
2017 Advanced Materials Proceedings  
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
more » ... 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.
doi:10.5185/amp.2018/728 fatcat:cxffpwfg4bc2zlc27bk7xvk4wm