Investigating the efficiency of single-walled and multi-walled carbon nanotubes in removal of penicillin G from aqueoussolutions

Background: Drugs, especially antibiotics, are one of the serious problems of modern life and the mainpollution sources of the environment, especially in the last decade, which are harmful to human healthand environment. The aim of this study was to investigate the removal of penicillin G from aqueoussolutions using single-walled and multi-walled carbon nanotubes.Methods: In this study, the effect of different parameters including pH (3, 5, 7, 9, and 11), initialconcentration of pollutant (50, 100, 150, and 200 mg/l), absorbent dose (0.25, 0.5, 0.75, and 1 g/L),mixing speed (0, 100, 200, and 300 rpm), and temperature (10, 15, 25, 35, 45°C) were investigated. TheLangmuir, Freundlich, Temkin, BET, Dubinin-Radushkevich isotherms and adsorption kinetics of thefirst- and second-order equations were determined.Results: The results showed that the efficiency of single-walled and multi-walled carbon nanotubesin the removal of penicillin G was 68.25% and 56.37%, respectively, and adsorption capacity of thenanotubes was 141 mg/g and 119 mg/g at initial concentration of 50 mg/l and pH=5 with adsorptiondose of 0.8 g/L for 105 minutes at 300 rpm and temperature of 10°C from aqueous solutions. Also, it wasrevealed that the adsorption process had the highest correlation with the Langmuir model and secondorderkinetics, and the maximum adsorption capacity based on Langmuir model was 373.80 mg/g.Conclusion: According to the results, it was found that single-walled and multi-walled carbon nanotubescan be used as effective absorbents in the removal of penicillin G from aqueous solutions.

کلیدواژه ها:

Single-walled carbon ، Multi-walled carbon ، Adsorption ، Penicillin G ، Antibiotics