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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 bydoi:10.5185/amp.2018/728 fatcat:cxffpwfg4bc2zlc27bk7xvk4wm