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Σύνθεση προσροφητικών υλικών με βάση το γραφένιο για την απομάκρυνση οργανικών ρύπων σε υδατικά διαλύματα

Ntouzidis Athanasios-Marios

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Summary

This particular dissertation examines the process of adsorption, using graphene, and specifically in the reduced form (RGO-Reduced Graphene Oxide). High importance was given to the synthesis of RGO and in the improvement of the individual processes. The substances that was examined was Sertraline, Fluoxetine and Citalopram, which belong to SSRI class, or selective serotonin reuptake inhibitors.For this purpose, various samples of reduced graphene oxide were synthesized with reduction with ascorbic acid (or vitamin C) was examined. The graphene oxide, that was used for the reduction, occurred from the exfoliation of graphite oxide, which had prepared from the oxidation of pure graphite with potassium permanganate, according with Hummers’ and Hoffeman’ method. Also, was conducted experiments with powdered activated carbon for comparison against a conventional and commercially available adsorbent.The experiments that took place, was aiming to the measurement of the concentration of the three substances before and after the adsorption, and to the application of various models for the kinetic and adsorption isotherms investigation.The results, that are documented in this project, shows a very promising and satisfactory adsorption performance, similar with that of activated carbon, but only a bit less. More specifically, according with the average of the double experiments that was conducted for the kinetic research, the final adsorbed mass per gram of adsorbent (qe) is for RGO 209.6μmol/g, 128.8μmol/g, 89.2μmol/g for Sertraline, Fluoxetine, Citalopram respectively, and in the case of activated carbon is 253.3μmol/g, 163.6μmol/g, 113.6μmol/g. It seems that the most efficient was the adsorption of Sertraline, with over the double the adsorption of Citalopram, in both cases. The balance is getting achieved after 2-3 hours in both situations. Furthermore, the pseudo-second kinetic model and the Langmuir equation approach very accurately the experimental data.

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