Preparation and characterization of a new CdS–NiFe2O4/reduced graphene oxide photocatalyst and its use for degradation of methylene blue under visible light irradiation

Novel Pt-Ag3PO4/CdS/Chitosan Nanocomposite with Enhanced Photocatalytic and Biological Activities

“…In the XRD pattern of Pt-Ag 3 PO 4 /CdS/chitosan in Figure 2 , the diffraction peak at ~27 of CdS and the peaks at 32.2°, 33.9°, 36.9°, 43.5°, 46°, 54.8°, and 57°, assigned to the (200), (210), (211), (220), (310), (320), and (321) planes of Ag 3 PO 4 , respectively, were vividly observed. Because of the low Pt loading on CdS/Ag 3 PO 4 /chitosan nanocomposite, no Pt diffraction peaks were detected [ 43 , 72 ]. XRD patterns for Ag 3 PO 4 are shown in Figure S3 .…”

“…In order to increase the photocatalytic activity of a catalyst, it is imperative to use various structures with matched bands of different semiconductors for the formation and the separation of photoinduced e − /h + pairs. The bandgap for CdS and Ag 3 PO 4 is 2.52 eV and 1.92 eV, respectively [ 32 , 43 ]. The CB potential of CdS is more negative than that CB of Ag 3 PO 4 .…”

“…However, these NPs have poor ability in separating the photoinduced e − /h + pairs, thus limiting their photocatalytic efficiency. A strategy for decreasing the recombination rate of e − /h + pairs on CdS is to combine it with other semiconductors such as NiFe 2 O 4 [ 43 ], ZnO [ 44 ], and Ag 3 PO 4 [ 45 ].…”

Magnetically Recoverable TiO2/SiO2/γ-Fe2O3/rGO Composite with Significantly Enhanced UV-Visible Light Photocatalytic Activity

“…Moreover, no Raman peaks corresponding to SiO 2 can be observed; hence, either Si 4+ is present in the substitutional positions in the TiO 2 crystal lattice, or it is present as amorphous SiO 2 . Peaks at 513 and 700 cm −1 can be attributed to γ-Fe 2 O 3 , respectively [ 34 ]. Moreover, for the sample of TSFG, both the D and G bands of GO, usually located at 1323 and 1570 cm −1 , have shifted to lower frequencies in comparison with GO ( Figure 4 b).…”

An overview: recent development of semiconductor/graphene nanocomposites for photodegradation of phenol and phenolic compounds in aqueous solution

“…Heterogeneous photocatalysis as a green strategy has many advantages including low operating costs, ambient operating conditions, and complete degradation of organic contaminants without producing secondary contaminants. Consequently, this method has a lot of applications in wastewater treatment [6][7][8]. It should be noted that, the narrow excitation wavelength, inadequate quantum efficiency, poor adsorption capacity, high recombination rate of the photoinduced electron-hole pairs as well as deactivation of the semiconductor as photocatalyst limit the application of the aforementioned method.…”