(768c) Effect of Hydrothermal Carbonization Temperature on Acidic and Basic Groups of Hydrochars Produced from Orange Peel and Grape Skin
AIChE Annual Meeting
2019 AIChE Annual Meeting
Catalysis and Reaction Engineering Division
Reactions in Near-Critical and Supercritical Fluids
Friday, November 15, 2019 - 1:04pm to 1:21pm
The surface functional groups on the surface of hydrochars play a vital role for ntheir a adsorption properties. Recently qualitative analysis of functional groups for bio-waste (i.e., fruit peels) has been carried out to correlate the morphology of the hydrichars to their adsorption properties. In addition, analysis of surface functional groups have been carried out for hydrochars produced from model compound (i.e, cellulose) at different HTC temperature. However, studies on the surface functional group of organic waste hydrochars are lacking. Investigation and characterization of surface functional group of bio-waste hydrochars will possbly open up a new route for the production of low-cost adsorbents. The understanding of the the content of such groups on the surface of hydrochars is key to unlock significvant number of multifunctional applications.
In this study, the acidic and basic functional groups on hydrochar surface produced from the orange peel and grape skin were quantified. Hydrochars were produced in an autoclave at three different temperature (180, 220, and 250 °C). A standard titration method (Boehm method) was used to measure the both functional groups on hydrochar surface. Both, backword and forward Boehm methods were used to measure the acidic and basic groups, respectively. Results showed that total acidic group decreases with the HTC temperature while the basic group increases as evidenced by FTIR analysis.