I have been using a NovaTouch surface area and pore analyzer to measure the surface area of some biochar samples. I have conducted at least several runs, each yielding results with negative intercept and c-constant values. Despite adjusting the parameters multiple times in an attempt to resolve the issue, I have seen very little improvement in my results.
Any assistance with this matter would be greatly appreciated.
All microporous materials (zeolites, active carbons, ..., and also biochars dependind on method of preparation) give negative intercept and consequently negative C-constant in BET isotherm. It is because BET-isotherm is not valid for microporous solids. For right evaluation you must use t-plot method or similar. Look my short paper: Hudec et al., Stud.Surf.Sci.Catal.142,2002,1587-1594
Pavol Hudec Thank you for taking the time to respond to my question. I have read your paper and found it incredibly helpful. I will adjust my methods according to what your paper describes and try again. I truly appreciate all of your assistance with this matter.
You need not to measure adsorption isotherm again, it is suffucien to treat the measured adsorption data by t-plot method
- Badges
- Science topic
- Similar topics
- Journal Impact Factor