Scale-inhibition and adsorption capacity due to a synergistic effect between a magnetic field and graphene oxide–carbon nanotube composite

摘要

A synergistic effect between a magnetic field and sulfhydryl-and amino-modified graphene oxide/ oxidized multi-walled carbon nanotubes (NH2-SH-GO/o-MWCNTs) that leads to scale inhibition in circulating water as well as the adsorption of lead ions and phenol is investigated. The composite was used to adsorb Pb2+ and phenol from circulating water and the results were analyzed to investigate the effect of varying the magnetic field intensity on various parameters including equilibrium adsorption capacity, pH, conductivity, activation energy, and relative change in intramolecular energy and free water proportion. The results show that the equilibrium adsorption capacity with respect to Pb2+ gradually increases with increasing magnetic field intensity. At a magnetic field intensity of 0.54 T, the equilibrium adsorption capacity reached 130 and 27.36 mg/g for Pb2+ and phenol, respectively. The synergistic effect caused the molecular activation energy in the circulating water to increase, while the intramolecular energy decreased. Due to the copious production of hydrogen bonds, collisions with scale-forming ions declined so that magnetic field was also able to play a role in scale inhibition. The synergistic effect between magnetic field and NH2-SH-GO/o-MWCNT is thus able to inhibit scale formation and adsorb pollutants from circulating water.