TiO2/graphene composite photocatalysts for NOx removal: A comparison of surfactant-stabilized graphene and reduced graphene oxide

Self-propagating solar light reduction of graphite oxide in water

“…The red shift of the peak from 234 nm to 257 nm is ascribed to increase of the size of the electronically conjugated domains with the continuing restoration of the sp 2 carbon network. The position of the peak is comparable with this of chemically and hydrothermally reduced GO found in the literature between 250 and 270 nm [17,49]. The disappearance of the peak at 300 nm has been usually attributed to removal of oxygen functionalities (C O) during reduction.…”

“…Such dispersions with one-or few-layered sheets known as graphene oxide (GO) are often the starting point for reduction and/or functionalization toward specific rGO applications. Graphene-based materials were reported effective as electroactive materials for supercapasitors [10][11][12] and Li + batteries [13], photoactive materials for CO 2 reduction to solar fuels [14][15][16], various pollutants degradation in combination with TiO 2 [17][18][19][20], ZnO [21], CdS [22,23], etc.…”

Visible-Light-Active TiO2-Based Hybrid Nanocatalysts for Environmental Applications

“…Both the heterostructures have provided NO x removal efficiency two times higher than that of the unmodified TiO 2 . Surprisingly, such improvement has not been ascribed to the higher surface area nor to the E g of the heterostructures, but to the excellent ability of graphene to accumulate photogenerated electrons, thus improving charge separation [134]. A further example of the efficiency of the C-based TiO 2 heterostructures can be seen in the NO removal under visible light irradiation reported by Ma and co-workers.…”

Thermal Defect Modulation and Functional Performance: A Case Study on ZnO–rGO Nanocomposites

“…The absence of any peak in the XRD patterns is ascribed either to a too low intensity of the signal pertaining to rGO, due to the low rGO concentration, or to an excellent incorporation of rGO within the MOx scaffold . Direct imaging of rGO by SEM is not possible when a conformal coverage of the rGO sheets by the MOx nano‐ or microstructures is obtained, which supports the fact that rGO sheets are enwrapped within the ZnO structures. SEM analysis of the nanocomposite after heat treatment is shown in Figure .…”