Investigation on UV-A light photocatalytic degradation of an azo dye in the presence of CdO/TiO2 coupled semiconductor

Dhatshanamurthi, P.; Subash, B.; Shanthi, M.

doi:10.1016/j.mssp.2015.02.069

Cited by 33 publications

(6 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some authors have observed three emission bands in the CdO film and attributed them to the non-radiative recombination processes corresponding to the PL quenching [54]. It is also found that the decreases in PL intensity are an issue related to the suppression of recombination of e À /hþ pairs by CdO matrix and GaN epilayer [55,56]. The photoluminescence spectroscopy is one of the methods of estimating the semiconductor band gap [57].…”

Section: Resultsmentioning

confidence: 99%

Transparent CdO/n-GaN(0001) heterojunction for optoelectronic applications

Soylu

Al-Ghamdi

Yakuphanoğlu

2015

Journal of Physics and Chemistry of Solids

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 99%

Transparent CdO/n-GaN(0001) heterojunction for optoelectronic applications

Soylu

Al-Ghamdi

Yakuphanoğlu

2015

Journal of Physics and Chemistry of Solids

View full text Add to dashboard Cite

“…[ 2 ] It is concluded that CTZ3 sample provides enough active sites for catalytic reaction and produces the transient electric dipoles which prevent the nucleation. [ 45,46 ] Consequently, irradiation can easily penetrate into catalyst in the suspended mixture, so AOP efficiency can be enhanced for the sample CTZ3 under visible light.…”

Section: Resultsmentioning

confidence: 99%

Heterogeneous Ternary Metal Oxide Nanocomposites for Improved Advanced Oxidation Process under Visible Light

Upadhyay

Pathak

2020

Crystal Research and Technology

View full text Add to dashboard Cite

Here, heterogeneous ternary metal oxide CdO:TiO 2 :ZnO (coded as CTZ0, CTZ1, CTZ2, CTZ3, CTZ4) nanocomposites are synthesized by a sol-gel precipitation method for the advanced oxidation process (AOP) under visible light. The structure, texture, and surface morphology of heterogeneous nanocomposites are identified by X-ray diffraction, high-resolution transmission electron microscopy, and field emission scanning electron microscopy, respectively, while the optical property is investigated by UV-vis spectrophotometry. Furthermore, mixed phases such as anatase and rutile TiO 2 , cubic CdO and hexagonal ZnO, as well as a mixture of morphology, viz., nanorod, nanoflakes, cluster, and aggregation of particles are observed concurrently for sample CTZ3. The reflectance of heterogeneous CdO:TiO 2 :ZnO nanocomposites is recorded in the visible wavelength range from 400 to 800 nm and optical bandgap is varied from 1.91 to 2.20 eV for samples CTZ1-CTZ4. The effect of weight load 5 g L −1 of heterogeneous nanocomposites is evaluated for degradation of organic dyes at neutral pH and obtains the highest efficiency for sample CTZ3 as 99.6% and 99.4% in methyl orange and methylene blue, respectively. Both biological oxygen demand and chemical oxygen demand values are reduced followed by AOP increasing the number of pollutant molecules for absorption in the mixture.

show abstract

“…It is also proposed that ultrasound increases the mass transport between the solution phase and catalyst surface, and de-agglomeration of particles increase the surface area of the catalyst. N-doped TiO 2 on glass spheres for Eriochrome Black-T decomposition [157] , and CdO/TiO 2 coupled semiconductor for Reactive Orange degradation [158] .…”

Section: The New Promising Semiconductors In Photo-degradation Of Dyesmentioning

confidence: 99%

Advances in Photo-catalytic Materials for Environmental Applications

Ra¹

2016

Res. Rev. J Mat. Sci

View full text Add to dashboard Cite

INTRODUCTIONOver two thirds of Earth's surface is covered by water; less than a third is taken up by land. As Earth's population continues to grow, people are putting ever-increasing pressure on the planet's water resources. In a sense, our oceans, rivers, and other inland waters are being "squeezed" by human activities-not so they take up less room, but so their quality is reduced. Poorer water quality means water pollution. We know that pollution is a human problem because it is a relatively recent development in the planet's history: before the 19 th century Industrial Revolution, people lived more in harmony with their immediate environment. As industrialization has spread around the globe, so the problem of pollution has spread with it. When Earth's population was much smaller, no one believed pollution would ever present a serious problem. It was once popularly believed that the oceans were far too big to pollute. Today, with around 7 billion people on the planet, it has become apparent that there are limits. Pollution is one of the signs that humans have exceeded those limits.Water pollution can be defined in many ways. Usually, it means one or more substances have built up in water to such an extent that they cause problems for animals or people. Water pollution almost always means that some damage has been done to an ocean, river, lake, or other water source. A 1969 United Nations report defined ocean pollution as: "The introduction by man, directly or indirectly, of substances or energy into the marine environment (including estuaries) resulting in such deleterious effects as harm to living resources, hazards to human health, hindrance to marine activities, including fishing, impairment of quality for use of sea water and reduction of amenities."Most water pollution doesn't begin in the water itself. Take the oceans: around 80 percent of ocean pollution enters our seas from the land. Virtually any human activity can have an effect on the quality of our water environment. When farmers fertilize the fields, the chemicals they use are gradually washed by rain into the groundwater or surface waters nearby. Sometimes the causes of water pollution are quite surprising. Chemicals released by smokestacks (chimneys) can enter the atmosphere and then fall back to earth as rain, entering seas, rivers, and lakes and causing water pollution. That's called atmospheric deposition. Water pollution has many different causes like: Sewage, Nutrients, Chemical waste, radioactive waste, Oil pollution, Plastics and Alien species. The common pollutants include toxic organic compounds like chlorinated and non-chlorinated aliphatic and aromatic compounds, dyes, inorganic compounds like heavy metals, noxious gases like NO x , SO x , CO and NH 3 , and pathogens like bacteria, fungi and viruses. ABSTRACTThe growth of industry worldwide has extremely increased the generation and accumulation of waste by products. This has caused severe environmental problems that have become a major concern. Because of this, photo-catalytic polluta...

show abstract

Investigation on UV-A light photocatalytic degradation of an azo dye in the presence of CdO/TiO2 coupled semiconductor

Cited by 33 publications

References 34 publications

Transparent CdO/n-GaN(0001) heterojunction for optoelectronic applications

Transparent CdO/n-GaN(0001) heterojunction for optoelectronic applications

Heterogeneous Ternary Metal Oxide Nanocomposites for Improved Advanced Oxidation Process under Visible Light

Advances in Photo-catalytic Materials for Environmental Applications

Contact Info

Product

Resources

About