P‐Nitrophenol Degradation Using N‐Doped Reduced Graphene‐CdS Nanocomposites

Abstract

A series of nitrogen doped reduce graphene‐CdS (NRGC) nanocomposites were successfully synthesized by using hydrothermal method. The structure and morphology of the samples were characterized by using FTIR, XRD, SEM, and PL. Photocatalytic activity of the nanocomposites for removing P‐nitrophenol (PNP) pollutant was studied under both ultra‐violet (UV) and visible light irradiation. The results show that NRGC nanocomposites exhibited higher photocatalytic activity than pure CdS. The degradation rate significantly increased to 50 and 70% by the addition of nitrogen doped reduced grapheme oxide (NRGO) to CdS under UV and visible irradiation, respectively. Higher photocatalytic activity of the nanocomposites was due to the role of NRGO as an excellent electron acceptor and transporter.

Core-Shell Nanostructures of Graphene-Wrapped CdS Nanoparticles and TiO2 (CdS@G@TiO2): The Role of Graphene in Enhanced Photocatalytic H2 Generation

“…Furthermore, the peaks appearing around 2800 and 1235 cm −1 are attributed to the vibrations from -CH 2 and C-OH groups present in graphene [37]. The peaks appearing around 1625 cm −1 is amplified in the graphene containing samples in comparison to pure CdS, which can be justified by the co-existence of C-C of the graphene and the Cd-S vibration from pure CdS, which confirms the presence of graphene in the CdS@xG@TiO 2 samples [38].…”

Photocatalytic Mechanism Control and Study of Carrier Dynamics in CdS@C3N5 Core–Shell Nanowires

“…Nitroaromatic compounds such as 4-nitrophenol (4NP) are common pollutants found in several agricultural and industrial wastewater that pose a potent threat to aquatic life and ecosystems. , 4-Nitrophenol is a refractory organic compound that resists natural degradation processes owing to its high chemical and biological stability. , In addition to RhB, we studied the 4NP degradation efficiencies of the three photocatalysts, namely, CdS, CdS-MHP, and CdS-MHPINS. Figure a shows the UV–vis absorption spectrum of the dilute aqueous 4NP solution (5 ppm).…”

“…Similar to the results obtained for the RhB degradation test, we witness the superior performance of the heterojunctions compared to the bare CdS photocatalyst, with the best photodegradation performance afforded by CdS-MHP. It is noteworthy that these heterojunctions show a much improved performance in this degradation test compared to nitrogen-doped reduced graphene-CdS nanocomposites reported earlier . To illustrate the 4NP degradation process, we attempted to augment the obtained UV–vis absorption data with high-performance liquid chromatography (HPLC) and mass spectrometric analysis.…”

“…It is noteworthy that these heterojunctions show a much improved performance in this degradation test compared to nitrogen-doped reduced graphene-CdS nanocomposites reported earlier. 85 To illustrate the 4NP degradation process, we S5 in the Supporting Information). It is interesting to note that, while the surface area and pore volume increased for the core−shell heterojunctions, pore diameters slightly decreased in the heterostructures compared to stand-alone CdS.…”

Development of stable S-scheme 2D–2D g-C3N4/CdS nanoheterojunction arrays for enhanced visible light photomineralisation of nitrophenol priority water pollutants

“…Several earth-abundant photocatalytic systems driven by visible light have been developed to remove Nitrophenols partially or entirely from water. These systems include CdS/Carbon/MoS x 20 , Co 3 O 4 loaded WO 3 21 , N-Doped Reduced Graphene-CdS 22 , p-type Mn 3 O 4 /ZnO 23 , CeO 2 24 , V 2 O 5 25 , CuO/ZnO 26 , and V 2 O 5 /N,S–TiO 2 27 . However, most reported work suffers from issues such as low degradation or partial removal, catalyst corrosion, and the use of either artificial light sources or large band gap materials with limited solar spectrum utilization.…”