Remarkable 4 Nitrophenol Degradation and Mineralization Performance Using Simple-Fabricated Oxygen Vacancy-Rich Copper Oxide/Peroxymonosulfate Photocatalytic System

Graphitic carbon nitride (g-C3N4) has proved to be a promising heterogeneous photocatalyst in the visible range. It can be used, among others, for the oxidative conversion of environmentally harmful nitrophenols occurring in wastewater. However, its photocatalytic activity needs to be enhanced, which can be achieved by modification with various dopants. In our work, copper-modified g-C3N4 was prepared by ultrasonic impregnation of the pristine g-C3N4 synthesized from thiourea. The morphology, microstructure, and optical properties of the photocatalysts were characterized by XRD, FT-IR, DRS, SEM, XPS, and TEM. DRS analysis indicated a slight change in both the CB and the VB energies of Cu/g-C3N4 compared to those of g-C3N4. The efficiency of the photocatalysts prepared was tested by the degradation of nitrophenols. Copper modification caused a sevenfold increase in the rate of 4-nitrophenol degradation in the presence of H2O2 at pH = 3. This dramatic enhancement can be attributed to the synergistic effect of copper and H2O2 in this photocatalytic system. A minor Fenton reaction role was also detected. The reusability of the Cu/g-C3N4 catalyst was demonstrated through five cycles. Copper-modified g-C3N4 with H2O2 proved to be applicable for efficient visible-light-driven photocatalytic oxidative degradation of nitrophenols.

Bi2O2S/CAU-17 bifunctional heterojunction for boosting CO2 photoreduction performance origin from the simultaneous photoxidation of tetracycline

Architecting an indirect Z-scheme NiCo2O4@CdS–Ag photocatalytic system with enhanced charge transfer for high-efficiency degradation of emerging pollutants

Effect of constituent processes and conditions of the hybrid TiO2 photocatalytic system on 1,4-dichlorobenzene degradation

Comprehensive evaluation of the catalytic activity of alpha-ferric oxide in photocatalysis, Fenton-like and photo-Fenton systems for organics degradation: Performance and in-depth mechanism consideration

Enhancement of Photocatalytic and Sonophotocatalytic Degradation of 4-nitrophenol by ZnO/Graphene Oxide and ZnO/Carbon Nanotube Nanocomposites

Improving removal of 4-chlorophenol using a TiO2 photocatalytic system with microwave and ultraviolet radiation

Visible light-driven photocatalytic H2 evolution and dye degradation by electrostatic self-assembly of CdS nanowires on Nb2C MXene

Nickel ions were reduced on the surface of cotton fibers under the effect of gamma radiation. The NiO nanoparticles grew as semispherical aggregates along the cotton fibers with average crystallite size of 32 nm as calculated from the x-ray diffraction results. The FTIR data showed the presence of a new IR peak at 613 cm-1 (assigned to the NiO stretching vibration) confirming the successful loading of NiO nanoparticles into cotton matrix. The NiO nanoparticles were adhered to the surface of cotton fibers through the complexation with hydroxyl and carbonyl groups. The NiO@cotton nanocomposite showed high performance in the catalytic degradation of both 4-nitrophenol and bromophenol blue. The rate constant of the catalytic degradation of 4-nitrophenol was 8.24 × 10-3 s-1 at pH = 10. The resultant heterogeneous catalyst is green, cheap, separable/recyclable, and has considerable catalytic activity.

In recent years, attributed to the excellent catalytic performance of precious metal materials, metal nanoparticles@MOF catalyst has been a popular research direction. Herein, we have synthesized a new 3D cobalt metal-organic framework [Co(TATAB)(344-pytpy)·DMF]n(H3TATAB = 4,4',4″-s-triazine-1,3,5-triyltri-p-aminobenzoic acid; 344-pytpy = 4'-(3-pyridyl)-4,2':6',4″-terpyridine)(1)(P1) by solvothermal method. Its crystal structure was determined with single-crystal X-ray diffraction (SC-XRD) techniques. The final composite Pd-NPs@1 catalyst was synthesized by a reduction method. The catalyst showed high catalytic performance and high recycling stability for nitrophenol degradation and cinnamaldehyde hydrogenation reaction.

3D printed photocatalytic feed spacers functionalized with β-FeOOH nanorods inducing pollutant degradation and membrane cleaning capabilities in water treatment

O-doped and nitrogen vacancies 3D C3N4 activation of peroxydisulfate for pollutants degradation and transfer hydrogenation of nitrophenols with water

The green and controllable synthesis of Au–Ag alloy nanoparticles (NPs) in one-pot has been a challenge in nanotechnology. Here, the soluble starch was employed as a reducing and capping agent to synthesize stable Au–Ag alloy NPs without using any toxic agent. The surface plasmon resonance wavelength and the composition of Au–Ag alloy NPs could be continuously adjusted only by the synthesis time in one-pot. Au–Ag alloy NPs were characterized by means of various techniques. It could be found as-prepared NPs were quasi-spherical with a small average size and a face-centered cubic polycrystalline structure. The above green synthesis method, facile, efficient and eco-friendly, can be extended to the controllable synthesis of other bimetallic NPs. Obtained Au–Ag alloy NPs exhibited a superior photocatalytic activity and stability for the 4-nitrophenol (4-NP) degradation due to abundance hydroxyl groups of the soluble starch and the synergistic effect between Au and Ag elements. The rate constant of 4-NP degradation could be linearly tuned by the composition of Au–Ag alloy NPs and their synthesis time besides their addition amount. The above methods to control the rate constant provide promising routes for other photocatalytic reactions using bimetallic NPs as photocatalysts.

Ag doped CuO thin film prepared via pulsed laser deposition for 4-nitrophenol degradation

Facile synthesis of bulk Au-Co-CoOx-CeOx@iron ball and its photocatalytic application in 4-nitrophenol degradation