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The sulfonated graphene oxide (GO-OSO3H) was synthesized by the oxidation of GO under concentrated H2SO4 conditions. It is demonstrated based on characterization results that sulfonated groups was satisfactorily grafted on the surface of GO. Macroscopic investigation indicated that the adsorption of Eu(III) on GO-OSO3H can be better fitted by pseudo-second-order kinetic model with high correlation...
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