Why UV light corrosive for long run photocatalysis application?

I am trying to imitate sunlight irradiation for the photocatalytic process. Some have suggest xenon lamp. However, I am still not clear about the specification of the lamp and does it required direct current ? Or is there any suggestion from fellow researchers for any type of light source?

Dear all,

For the photocatalytic reactor to work in UV-a to the visible range, is it compulsory to use a quartz beaker to hold the sample? Instead, if borosilicate beakers are used, will it ensure good transmission of UV radiation?

Thanks in advance

In many articles pollutants are being degraded by UVA rays, why UVA? What would be the impact if instead UVB or UVC was used? Is there any literature data available on how to choose between the three for specific applications?

Whether UV-irradiated affects other parameters, e.g., photolysis and surface groups of soils. How long does ultraviolet radiation have an effect. I think the effect on the soil properties can be ignored in a certain time and a certain irradiance, right? Is there a detailed literature describing the problem

Hello, I made some measurements using a UV-vis spectrometer at intervals of 5 minutes to see the degradation of a resazurin dye by TiO2 under UV light. I did not repeat these measurements. How can I calculate the error in the results?

I want to generate pure oxygen using air. I read about ozone-oxygen cycle. If i have a technique to generate ozone(using either uv light or hight voltage source) , how can i efficiently convert ozone into oxygen, can system have oxygen output comparable to pressure swing adsorption Technology?

in PCO processes UV light separate an electron from TiO2 plates , then separated electron react to water and generate negative OH which can destroy contaminations ,

my question is '' what happen to TiO2 plates after PCO filtration process? ''

are they finished ?

Hi! I am looking for some specific information in regards to the minimum amount of UV intensity required to begin the photo degradation process in polymers. I understand each polymer is different and impurities, stabilizers, etc. will make answering this question difficult. So, let's assume the prepolymer is a polyether (PPG) based polyurethane extended with TDI and crosslinked (via UV cure and a photo-initiator) through terminal methacrylate groups. No stabilizers.

Then lets say I decide to expose this material to a specific wavelength of UV light, 365 nm, at various intensities such as: 200 mW/cm2, 1 W/cm2, 5 W/cm2, and 15 W/cm2 for 3 minutes each.

I am curious on the minimum intensity and time to initiate the photo oxidation process. Will 200 mW do it? Will it begin at 1 W but only after 2 minutes? Does any amount of UV light initiate it regardless of intensity? I know seeing a color change will help me, but does the free radical / hydrogen abstraction process happen before (or even during) the yellowing process? Is photo oxidation a relatively slow or fast process?

Are there any sort of 'bond energies' I can associate with a given UV intensity to see if it is enough energy to cause bond disassociation?

Any information you can provide would be appreciated!

Thanks!

how to plot an adsorption isotherm using surface coverage (theta) for corrosion inhibitors?