Preparation and Photocatalytic Performance of MWCNTs/TiO₂Nanocomposites for Degradation of Aqueous Substrate

Abstract

In this study, multiwalled carbon nanotubes (MWCNTs)/TiO 2 nanocomposites were obtained by constant volumetric wet impregnation processes. The prepared catalysts were characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The effect of reaction conditions on photocatalytic performance of the catalysts was investigated by the degradation of methyl orange (MO) under UV irradiation, in a new type of reactor with unique structure. The results showed that the prepared nanocomposite exhibited higher MO degradation efficiency than that of pure nano-TiO 2 . Besides, in batch experiments of influencing factors, including ionic strength, oxidant amount, and response times, the presence of H 2 O 2 would contribute to increasing the MO degradation rate of MWCNTs/TiO 2 samples. Ionic concentration and long reaction times are adverse to the MO degradation in the processes.

Carbon Nanomaterials for the Treatment of Heavy Metal-Contaminated Water and Environmental Remediation

“…Park et al decorated titania on aerogel of SWCNTs and successfully applied for the removal of methylene blue from water [86]. Zhao et al fabricated MWCNTs-TiO 2 and applied for the photodegradation of methylene blue [87]. Xu et al designed photocatalysts by the combination of hydroxy-MWCNTs and PbO 2 nanocrystalline anode and applied it successfully for the removal of pyridine from water [88].…”

Functionalized multi-walled carbon nanotubes for oil spill cleanup from water

“…The photo-catalytic performance of these composites was tested for the degradation of methyl orange (MO). The results indicated that modified nanocomposites exhibited higher MO degradation efficiency than the pure nano-TiO 2 (Duan et al 2016).…”

“…MWCNTs as adsorption media have significantly achieved great attention because of their excellent hydrocarbon removal capacities following the surface functionalization as detailed by Kim et al (2012) similarly for the reduction of dyes as studied by Duan et al (2016). MWCNTs-based adsorbents have been widely explored for the removal of heavy metals from industrial effluents and have shown high sorption performance among all known adsorbents.…”

“…It mainly increased the recombination time for photo-generated electron-hole pairs. It is also evident from the delocalized π-structure nature of MWCNTs that it promotes the electron transfer causing hole-electron separation (Duan et al 2016).…”

“…Fig. 8 Mechanism of photo-catalytic degradation of methylene blue with titanium-dioxide-doped MWCNTs (Duan et al 2016) The overall reaction can be given as follows:…”