Abstract:The preparation of sulfonated reduced graphene oxide and its adsorption capacity towards basic dyes were investigated in this study. Sulfonated reduced graphene oxide nanosheets (S-rGO) were prepared through grafting aromatic radical-containing sulfonic acid onto chemically reduced graphene oxide (rGO). The synthesized adsorbent sulfonated reduced graphene oxide (S-rGO) was characterized by fourier-transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The results showed that the sulfonate was successfully grafted onto graphene oxide (GO). The effects of pH, time and adsorbent dose on adsorption behavior were systematically studied. The results of the adsorption experiments showed that the adsorption process followed the quasi-second-order kinetic model and the Langmuir model, indicating that the adsorption was controlled by the surface reaction process and belonged to monolayer adsorption. In the adsorption and desorption experiments, the adsorption rates of basic orange 21, thioflavine T and rhodamine B were all greater than 99%, with the desorption rates as 98.81%, 86.63% and 94.44%, respectively, indicating that the sorbent S-rGO had good adsorption, desorption and reuse capacities. The use of this material to treat industrial wastewater could prevent the contamination of agricultural products from harmful dyes and their accumulation in the food chain, thereby threatening human health.
