I analysed surface area (BET), total pore volume, non-micropore volume, pore size distribution of biochar before adsorption and after equilibrium-reached adsorption of cationic and anionic dyes. The removal efficiency of biochar for cationic and anionic dyes was nearly 100%.
I think that if adsorption mechanisms related to pore of biochar, the surface area total pore volume, non-micropore volume of biochar after adsorption must decrease.
Biochar was pyrolysised at 800 oC under O2-limited condition, so the amount of acid groups of biochar surface was negligible.
Thanks for your help.
this article is good
nfluence of Pyrolysis Temperature on Biochar Property and Function as a Heavy Metal Sorbent in Soil
Minori Uchimiya*, Lynda H. Wartelle, K. Thomas Klasson, Chanel A. Fortier, and Isabel M. Lima
USDA-ARS Southern Regional Research Center, 1100 Robert E. Lee Boulevard, New Orleans, Louisiana 70124, United States
J. Agric. Food Chem., 2011, 59 (6), pp 2501–2510
I understand that you measured surface area and pore volumes BEFORE adsorption experiments, but please explain how you measured the same AFTER. How did you do that: drying, outgassing, ... ? Then, maybe, I'll be able to provide an answer.
Alain
The answer has been did in my Chapter
Chapter Chapter 12:Sustainable Biochar Derived from Agricultural Was...
On a fast read I could not find anything about the pretreatment (degassing procedure) before the BET measurement. Please tell us how it was performed.
It is possible the exhausted (after equilibrium) to have the same surface area. The total pore volume can be decreased without a simultaneous BET surface area decrement.
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