Adsorption Behavior of Nitrofurantoin onto Multi-Walled Carbon Nanotubes and Magnetite (Fe3O4)-loaded Multi-Walled Carbon Nanotubes from Aqueous Solution

摘要

Adsorption of nitrofurantoin (NFT) on multi-wall carbon nanotubes (MWCNTs) and magnetic multi-wall carbon nanotubes (M-MWCNTs) has been investigated in this study. The controlling parameters for adsorption process were solution pH, ionic strength, sorbent amount, sorption time, and temperature. The results showed that the adsorption efficiency of MWCNTs and M-MWCNTs could reach 97.86% and 88.89% after 180 minutes, respectively, when their dosage was 0.6 g L-1 and solution pH close to neutral. The pseudo-second-order model could interpret the kinetics of the adsorption process. Equilibrium data can be fitted by the Freundlich isotherm. The adsorption mechanism may include electrostatic attraction.