Nanocarbons decorated TiO2 as advanced nanocomposite fabric for photocatalytic degradation of methylene blue dye and ciprofloxacin

Abstract

In this research, C [graphene (Gr), multi-walled carbon nanotubes (MWCNTs), and single-walled carbon nanotubes (SWCNTs)] decorated TiO2 nanostructures were developed and further utilized to modify textile to achieve high-performance photocatalytic degradation of mixed water pollutants including methylene blue (MB) dye and pharmaceutical active compound, Ciprofloxacin (CPF) on solar radiation exposure ( 105 Lumens). The crystallite sizes of TiO2, TiO2-MWCNT, TiO2-SWCNT, and TiO2-Gr nanocomposites were observed in the 7.2-10.4 nm range. The bandgap, Eg of nanostructured C-TiO2, was observed in the 3.09-3.14 eV range. The photocatalytic performance of C-TiO2 showed almost complete removal of MB under the irradiation of the solar spectrum in just 120 min. Among C-based TiO2 nanocomposites, nanostructured TiO2-SWCNT showed the highest degradation efficiency of 98.86 % for MB dye. Further, the textile membrane showed a good degradation efficiency of 99.49 % for MB dye and 95.7 % for CPF within 120 min. An impressive removal efficiency of 93 % was observed for the mixture of MB and CPF solution due to a combination of several properties like surface groups (OH- & O2- ), low charge recombination rate due to CNTs, and small crystal size. This proof-of-the-concept study can be the potential platform to manage water quality according to sustainability goals.