Anchoring of ZnO nanoparticles on exfoliated MoS2 nanosheets for enhanced photocatalytic decolorization of methyl red dye

Mesoporous Octahedron-Shaped Tricobalt Tetroxide Nanoparticles for Photocatalytic Degradation of Toxic Dyes

“…Concurrently, the electrons in the conduction band of the corresponding Co 3 O 4 interacted with the dissolved molecular oxygen present in H 2 O to produce a superoxide radical anion, which was further allowed to react with the H 2 O molecule to produce – OH, which has powerful oxidizing ability. Due to the presence of such strong oxidizing agents, the corresponding dyes were oxidized and turned colorless . It is highly notable that the morphology of metal oxide plays a key role in reducing the probability of electron–hole pair recombination, which is vital for efficient photocatalysis. − Photocatalytic semiconductor materials with 0D-, 1D-, 2D-, and 3D-like morphologies provide better photocatalytic activity compared to those with other disordered morphologies. , Apart from other effects of semiconductor materials, the band gap of the corresponding metal oxide is a key factor for enhanced photocatalytic activity.…”

“…Due to the presence of such strong oxidizing agents, the corresponding dyes were oxidized and turned colorless. 12 It is highly notable that the morphology of metal oxide plays a key role in reducing the probability of electron− hole pair recombination, which is vital for efficient photocatalysis. 53−56 Photocatalytic semiconductor materials with 0D-, 1D-, 2D-, and 3D-like morphologies provide better photocatalytic activity compared to those with other disordered morphologies.…”

“…Today’s major concern is to get clean water owing to fast civilization and industrialization, which is an essential for the survival of living organisms. In recent years, the extensive use of carcinogenic organic dyes in the textile industry has increased gradually and increased amounts of pollutant effluents have been released into aquatic ecosystems. − This causes depletion of the dissolved oxygen content, which has adverse effects on aquatic creatures and mankind. − Toxic dyes such as methyl red (MR), Eriochrome Black-T (EBT), bromophenol blue (BPB), and malachite green (MG) are significantly used in textiles, paper making, and pharmaceuticals − due to their relatively low cost even though they are known to have harmful effects on the reproductive system, genotoxicity, and carcinogenic properties. − These dyes are difficult to eradicate by conventional techniques such as adsorption, coagulation, flocculation, biodegradation, and so forth. ,,, All these methods are expensive and require extra planning to remove the byproducts. Alternatively, photocatalytic degradation of toxic dyes into nontoxic compounds is the most desirable process to mitigate their environmental impact. , Thus, it is indispensable to develop a possible permanent solution for the degradation of toxic dyes in wastewater streams.…”

Photocatalytic degradation of methyl red by porous zinc hydroxide under visible light irradiation

“…Among these methods, the photocatalytic degradation of methyl red has been widely utilized due to its high efficiency, nontoxicity, and cost effectiveness . Recently, it has been proposed that the degradation of methyl red using semiconductor‐based photocatalysts (such as TiO 2 , ZnO, and NiO) under visible light irradiation has attracted extensive attention, largely because the ultimate degraded products are CO 2 and H 2 O with no secondary pollution . However, various semiconductors can only be activated by the ultra visible (UV) light because of their large bandgap and relatively low quantum efficiency, resulting in limited light absorption ability.…”

“…[16] Recently, it has been proposed that the degradation of methyl red using semiconductor-based photocatalysts (such as TiO 2 , ZnO, and NiO) under visible light irradiation has attracted extensive attention, largely because the ultimate degraded products are CO 2 and H 2 O with no secondary pollution. [17,18] However, various semiconductors can only be activated by the ultra visible (UV) light because of their large bandgap and relatively low quantum efficiency, resulting in limited light absorption ability. It is a remarkable fact that one of the novel materials for potential application in photocatalysts (degradation of methyl red) is hydroxides because of their simple synthesis methods, low cost, high effectiveness, and stability.…”