Strategies for reduction of graphene oxide - a comprehensive review

Graphene oxide, silver and copper oxide nanoparticles display photoactivated antibacterial behavior owing to their ability to generate charge carriers via light exposure. In this work, silver nanoparticles (AgNPs) and copper oxide nanoparticles (CuONPs) were embedded through graphene oxide (GO) using laser ablation technique. The microstructural behavior of the synthesized compositions has been investigated via XRD and TEM. The optical properties were studied by (UV–Vis), while the antibacterial properties were investigated in addition to the cell viability towards normal cell line (HFB4) in vitro. The antibacterial activity of GO was enhanced significantly with addition nanoparticles; by meaning, the inhibition zone enlarged from 5.4 mm with pure GO to be around 11.2 mm against E. coli with contribution of CuONPs. This trend of enhancement suggests that GO could be a great platform for different kinds of photo-activated antibacterial to be recommended for versatile biomedical applications.

Silver and copper oxide nanoparticles-decorated graphene oxide via pulsed laser ablation technique: Preparation, characterization, and photoactivated antibacterial activity

Synthesis of CuO@CoNi LDH on Cu foam for high-performance supercapacitors

A ternary Cu2O-BiVO4-WO3 nano-composite was prepared and its catalytic activity was evaluated in the photodegradation of sulfasalazine (SSZ). The structural and compositional characterization of the composite was evaluated by XRD, TEM, and FE-SEM techniques. Its optical properties were also investigated by UV–vis diffuse reflectance spectroscopy (DRS) and photoluminescence spectroscopy (PL). The composite showed a boosted activity with respect to the individual semiconductors due to better charge carriers' separation. The increased charge separation of the composite was confirmed by the PL results. The composite showed weaker PL peaks than the single systems, showing slower e−/h+ recombination. Both PL intensity and photodegradation efficiency depended on the mole ratio of the combined semiconductors in the composite. The mole ratio of 2:1:1 for the Cu2O/BiVO4/WO3 composite showed the best photodegradation activity. The optimal conditions were obtained at catalyst dose: 0.3 g L−1, CSSZ: 8 mg L−1, initial solution pH: 3.75 and visible light irradiation time: 40 min. The pseudo-first-order rate constants of 0.013 min−1 and 0.039 min−1 (correspond to t1/2 values of 53.31 min and 17.77 min) were obtained from UV–vis and COD results, respectively. The mineralization extents of 24, 44, 59, 77 and 85.7% were respectively obtained at irradiation times of 10, 20, 25, 40 and 50 min based on COD results.

A comprehensive study on the enhanced photocatalytic activity of Cu2O/BiVO4/WO3 nanoparticles

Cu2O-CuO@biochar composite: Synthesis, characterization and its efficient photocatalytic performance

The control over the water pollution caused by the organic and biological pollutants is one of the challenging tasks for the scientific community. Here, we have focused to develop materials which can be used to remove both types of water pollutants and also assist in solving problems related to the energy crisis. The CuO, Cu2O, rGO-CuO and rGO-Cu2O of different shapes (sphere, rod and wire) and crystal phases were synthesized and their photocatalytic, antibacterial and supercapacitive properties were investigated. The photocatalytic activity of the synthesized products was measured against methylene blue (MB) dye under the direct sunlight while the antibacterial activity was tested against Klebsiella (gram-negative) and S. aureus (gram-positive) microbes. The electrochemical measurements revealed better supercapacitive performance of the rGO-CuO and rGO-Cu2O nanocomposites.

Facile synthesis of CuO nanowires and Cu2O nanospheres grown on rGO surface and exploiting its photocatalytic, antibacterial and supercapacitive properties

Onion juice assisted green reduction of graphene oxide with tunable structural and optical properties: Effect of onion juice concentration and reaction temperature

Dipjyoti Bhorolua

Papers

Facile synthesis of CuO nanowires and Cu2O nanospheres grown on rGO surface and exploiting its photocatalytic, antibacterial and supercapacitive properties

Onion juice assisted green reduction of graphene oxide with tunable structural and optical properties: Effect of onion juice concentration and reaction temperature