Hello scientific community, please I would like some information on the characterization of adsorbent materials by the Boehm method. I would be grateful if you could correct the procedure for me.

To my knowledge, the Boehm method consists of mixing (for 24 hours) a mass of adsorbent of the order of 0.15 g in a closed bottle with 50 ml of a 0.01 mol / l aqueous solution of reagent. The reagent could be either NaOH to neutralize the phenolic groups, or Na2CO3 to neutralize the lactones, or NaHCO3 to neutralize the carboxyl groups, or HCl to determine the content of basic groups. Then, the suspensions are filtered through membrane filters at 0.45 μm and the filtrates are titrated (adsorbent-NaOH, adsorbent-Na2CO3, adsorbent-NaHCO3) with HCl (0.01 M) and the filtrate (adsorbent-HCl) is titrated with NaOH (0.01 M).

The question is how to quantify acidic and basic groups? How to quantify carboxylic groups, lactonic groups, phenolic groups, carbonyl groups, total oxygenated groups, total basic groups? What units are the results expressed by?

Thank you infinitely for all your efforts. I confide in your availability and friendliness. In the end, please accept my heartfelt Thanks and sincere salutations.

Yours sincerely

Mohammed Benjelloun

PhD Student Researcher

Laboratory of Materials, Processes, Catalysis, and Environment, University Sidi Mohamed Ben Abdellah, Higher School of Technology, Post office Box 2427 Fez, Morocco