Why is ZnO used as photocatalyst?
ZnOhas potential as photocatalyst material because its property of wide band gap. Shakti [4] reported that zinc oxide is an N-type semiconductor with a wide band gap of 3.37 eV and a large exciton binding energy of 60 meV.
What is ZnO structure?
Structure. Zinc oxide crystallizes in two main forms, hexagonal wurtzite and cubic zincblende. The wurtzite structure is most stable at ambient conditions and thus most common. The zincblende form can be stabilized by growing ZnO on substrates with cubic lattice structure.
What is the application ZnO?
ZnO is a multipurpose material that has been utilized in multiplicity of applications such as UV absorption, antibacterial treatments, sunscreen lotions, [50], catalysts [51], photocatalysis [52], biological applications due to their great biocompatibility, low toxicity, and economic.
Which dye degradation is carried using ZnO photocatalyst?
Figure 11 shows the degradation of RhB solution over a period of time using rodlike ZnO particles as photocatalyst. The color of RhB slowly faded when exposed to UV radiation for 0 min, 20 min, 40 min, 60 min, and 80 min.
Which of the following dye is used in photocatalytic activity of ZnO?
Zinc oxide (ZnO) photocatalysts were synthesized by sol–gel method using zinc acetate as precursor for degradation of azo dyes under UV irradiation.
What are ZnO nanoparticles used for?
Zinc oxide nanoparticles (ZnO NPs) are used in an increasing number of industrial products such as rubber, paint, coating, and cosmetics.
Why ZnO is called Philosopher’s Wool?
The compound zinc oxide (ZnO) is called philosopher’s wool. It is said that Alchemists, as part of their rituals, would burn zinc in air and collect the residue, which formed into white woolly tufts.
Is ZnO a metal?
Zinc oxide (ZnO) is one of the interesting metal-oxide-based semiconductors with relatively biosafe and biocompatible properties which is very suitable for sensor/transducer applications and drug delivery to intracellular environment.
What is photocatalytic dye degradation?
The standard experimental set up for dye degradation photocatalysis is by using a UV lamp to provide energy for the creation of oxidizing radicals. Photocatalysis is the addition of light to a semiconductor oxide/sulphide that results in electrons moving from the valence band to the conduction band.
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