Modern industry caused human being to be exposed to heavy metals, which have occurred in fields of batteries, mining, fertilizer, metal plating and so on. Amongst metals, penetrating copper in body has to do with kidney damage, high fever, hemolysis and vomiting. Cupric ion (Cu2+) of oxidation state of Cu, especially, is more toxic than any other copper species. In order to eliminate discharged harmful copper, precipitation, coagulation, filtration, adsorption and reverse osmosis are well-known techniques for removal of heavy metals in aqueous phase. We picked both precipitation and adsorption with using supporter. Silica nanotube having merit for pores to easy mass transfer is generally employed to biotechnology or environmental engineering. However its specific surface area is not as spacious as SBA-15, SBA-16, MCM-41 or MCM-48. Our study choose modified double-wall silica nanotube(DWSNT); not only good pores but also compensating lacking specific surface area. Introducing different amine types which were primary, secondary, tertiary, mono, di and tri onto the surface of DWSNT, we were able to figure out the effect for Cu2+ adsorption. Cu2+s crystallized on the surface due to excessive presence of OH- from water molecules at near the surface. Additionally, amount of Cu2+s were adsorbed simultaneously in forms of complexed copper ion and Cu compounds. X-ray diffraction(XRD) and Fourier transform infrared spectroscopy(FT-IR) were used to confirm crystallized Cu compounds. The nitrogen amount of supporter was obtained by elemental analyzer(EA) and FT-IR was used to confirm the synthesis of amine-functionalized DWSNTs. Quantitative analysis of adsorbed Cu2+ on supporter was determined by inductively coupled plasma atomic emission spectrometer(ICP-AES). Our study grasped the effect of adsorption site as amine types onto the DWSNT. The result based on adsorption amounts of Cu2+ is tri-amine &gt; di-amine &gt; 1° amine &gt; 2° amine &gt; 3° amine. Complexed Cu2+s on the surface change into Cu(OH)2 owing to reaction with dissociated OH- from H2O. Verified crystallization phenomenon on supporter suggests novel method for metal ion sequestration in aqueous phase.

Removal of Cu2+ in aqueous system by different amine types on silica nanotube

253rd National Meeting (2017)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.