(401i) Efficient Decolorization of Citric Acid Fermentation Broth using Carbon Materials Prepared from Phosphoric Acid Activation of Hydrothermally Treated Corncob
AIChE Annual Meeting
2017
2017 Annual Meeting
Separations Division
Poster Session: Separations Division
Tuesday, October 31, 2017 - 3:15pm to 4:45pm
Citric acid, as an important organic acid, is largely used in aspects of food, beverage, chemical and pharmaceutical fieldsï¼and plays increasingly important role in the society. However, currently the downstream aspect of separating the citric acid is facing a tremendous problemââthe decolorization of the citric acid fermentation broth. In order to costly and efficiently remove the pigments, a novel biomass-based carbon material, hydrochar, is put forward. During the preparation process, by adjusting the hydrothermal conditions (temperature, time) and feedstock type (food residue, agricultural, etc), we obtained an excellent hydrochar to be used in the decolorization of citric acid fermentation broth. Additionally, for further improving its adsorption performance, the post chemical activation is applied to optimize it textural characteristics. Meanwhile, the pigments adsorption process on the hydrochar-based carbon material (HBCM) was fully investigated. Meanwhile, the material was fully characterized by SEM, BET, FTIR, XPS and pHpzc, and several mathematic models were used to analyze the adsorption mechanism involved in the adsorption process. Finally, the tailor-made HBCM had the excellence performance to achieve 99% decolorization ratio and no loss of citric acid at the optimum operating conditions. It could be a potential adsorbent for the removal of pigments in the citric acid fermentation broth.