TY - JOUR
T1 - Spent coffee grounds biochar from torrefaction as a potential adsorbent for spilled diesel oil recovery and as an alternative fuel
AU - Lee, Kuan Ting
AU - Cheng, Ching Lin
AU - Lee, Da Sheng
AU - Chen, Wei Hsin
AU - Vo, Dai Viet N.
AU - Ding, Lu
AU - Lam, Su Shiung
N1 - Funding Information:
The authors acknowledge the financial support provided by the Ministry of Science and Technology, Taiwan , R.O.C., under the grant numbers MOST 109-2221-E-006-040-MY3 , MOST 110-2622-E-006-001-CC1 , and MOST 110-3116-F-006-003- for this research. This research is also supported in part by the Higher Education Sprout Project, Ministry of Education to the Headquarters of University Advancement at National Cheng Kung University (NCKU). The authors thank Universiti Malaysia Terengganu under Golden Goose Research Grant Scheme (GGRG) (Vot 55191 ) for supporting Dr. Lam to perform this joint project in collaboration with National Cheng Kung University. The authors gratefully acknowledge the use of EM000600 of 110-2731-M-006-001 belonging to the Core Facility Center of National Cheng Kung University .
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2022/1/15
Y1 - 2022/1/15
N2 - A new approach using torrefied spent coffee grounds (TSCG) as a bioadsorbent is presented for marine oil spill recovery. The adsorbent after diesel adsorption is referred to as “oilchar”. The torrefaction of spent coffee grounds (SCG) is performed at 200, 250, and 300 °C where the solid yields are 95%, 80%, and 62%, respectively. The specific surface area, hydrophobicity, thermal stability, diesel adsorption capacity of SCG increases with increasing torrefaction temperature. SCG torrefied at 300 °C (300-TSCG) can intensify its specific surface area, contact angle, crystallinity, diesel adsorption capacity by factors of 7.6 folds, 10.3%, 35%, and 1.47 times, respectively. The diesel adsorption capacity of 300-TSCG is 1.36 times that of commercial activated carbon. The higher heating value of 300-TSCG is 30.32 MJ kg−1, accounting for a 45.1% improvement compared with that of untorrefied SCG. After adsorbing diesel, the HHV of the oilchar from 300-TSCG is 1.23 times that of SCG-oilchar, while the ignition temperature of 300-TSCG decreases from 301 to 157 °C. Overall, TSCG is a promising material to adsorb spilled diesel oil for environmental protection, and the resultant oilchar is a potential alternative fuel for thermal power plants and steel mills, thereby achieving waste reuse and circular economy.
AB - A new approach using torrefied spent coffee grounds (TSCG) as a bioadsorbent is presented for marine oil spill recovery. The adsorbent after diesel adsorption is referred to as “oilchar”. The torrefaction of spent coffee grounds (SCG) is performed at 200, 250, and 300 °C where the solid yields are 95%, 80%, and 62%, respectively. The specific surface area, hydrophobicity, thermal stability, diesel adsorption capacity of SCG increases with increasing torrefaction temperature. SCG torrefied at 300 °C (300-TSCG) can intensify its specific surface area, contact angle, crystallinity, diesel adsorption capacity by factors of 7.6 folds, 10.3%, 35%, and 1.47 times, respectively. The diesel adsorption capacity of 300-TSCG is 1.36 times that of commercial activated carbon. The higher heating value of 300-TSCG is 30.32 MJ kg−1, accounting for a 45.1% improvement compared with that of untorrefied SCG. After adsorbing diesel, the HHV of the oilchar from 300-TSCG is 1.23 times that of SCG-oilchar, while the ignition temperature of 300-TSCG decreases from 301 to 157 °C. Overall, TSCG is a promising material to adsorb spilled diesel oil for environmental protection, and the resultant oilchar is a potential alternative fuel for thermal power plants and steel mills, thereby achieving waste reuse and circular economy.
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U2 - 10.1016/j.energy.2021.122467
DO - 10.1016/j.energy.2021.122467
M3 - Article
AN - SCOPUS:85118574567
VL - 239
JO - Energy
JF - Energy
SN - 0360-5442
M1 - 122467
ER -