TY - JOUR
T1 - CO2 uptake by activated hydrochar derived from orange peel (Citrus reticulata)
T2 - Influence of carbonization temperature
AU - Deepak, K. R.
AU - Mohan, Sooraj
AU - Dinesha, P.
AU - Balasubramanian, Rajasekhar
N1 - Publisher Copyright:
© 2023 Elsevier Ltd
PY - 2023/9/15
Y1 - 2023/9/15
N2 - In this study, activated hydrochar was prepared from orange peel (OP) waste using KOH for the first time for potential environmental applications. The influence of hydrothermal carbonization temperature (180 °C, 200 °C, and 220 °C) on the CO2 adsorption capacity of OP-derived activated hydrochar (OP-180, OP-200, and OP-220) was investigated. Scanning electron microscope (SEM) images revealed that the activated OP hydrochar has high microporosity, a desired attribute for effective adsorption. The yield and the oxygen content of the hydrochar decreased with the increasing process temperature whereas the carbon content showed an increase. Fourier-transform infrared spectroscopy showed the presence of various functional groups including ketone, aldehydes, esters, and carboxyl in the hydrochar. CO2 adsorption isotherm was determined for all hydrochar samples. At 25 °C and 1 bar, OP-220 showed the highest CO2 uptake at 3.045 mmol/g. The use of OP waste for CO2 adsorption applications contributes to carbon neutrality and a circular economy.
AB - In this study, activated hydrochar was prepared from orange peel (OP) waste using KOH for the first time for potential environmental applications. The influence of hydrothermal carbonization temperature (180 °C, 200 °C, and 220 °C) on the CO2 adsorption capacity of OP-derived activated hydrochar (OP-180, OP-200, and OP-220) was investigated. Scanning electron microscope (SEM) images revealed that the activated OP hydrochar has high microporosity, a desired attribute for effective adsorption. The yield and the oxygen content of the hydrochar decreased with the increasing process temperature whereas the carbon content showed an increase. Fourier-transform infrared spectroscopy showed the presence of various functional groups including ketone, aldehydes, esters, and carboxyl in the hydrochar. CO2 adsorption isotherm was determined for all hydrochar samples. At 25 °C and 1 bar, OP-220 showed the highest CO2 uptake at 3.045 mmol/g. The use of OP waste for CO2 adsorption applications contributes to carbon neutrality and a circular economy.
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U2 - 10.1016/j.jenvman.2023.118350
DO - 10.1016/j.jenvman.2023.118350
M3 - Article
AN - SCOPUS:85161664947
SN - 0301-4797
VL - 342
JO - Journal of Environmental Management
JF - Journal of Environmental Management
M1 - 118350
ER -
