I have an activated carbon sample for which I want to measure absorption and transmission, reflection spectra from UV-VIs-NIR spectrometer in the solar spectrum. The equipment has cuvettes for transparent liquids, and some have solid measurement holders. How is the sample preparation done for this activated carbon. It is black and opaque, and is porous and macro-sized (a few millimeters in size). Can it be used as is or should it be crushed to very fine powder size. Any help on this is highly appreciated. Thank you.
- Sai Kiran
To obtain a spectrum, disperse activated carbon, place it in a cell with a central mount in the middle of the integrating sphere. See instructions
https://www.perkinelmer.com/lab-solutions/resources/docs/APP_UseofUVVisNIRinDevelopmentPV.pdf
Crush or grind it into very finely divided form using a power-driven vibrator. To ensure thorough grinding, do not let sample size be more than a few milligrams. Due to electronic absorption, the absorption becomes so intense that the sample becomes opaque and so near infrared spectrum which is what you have. I don't know how you prepared your activated carbon or from what substrate. But see the attached document, please.
Thank you for this suggestion. Would you say, that intensity of the reference spectrum of KBr should be subtracted from the carbon pellet sample. Thank you.
Definitely. That will be the approach for me. Thank you Dr. Artur Braun
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