TY - JOUR
T1 - Evaluation of ultrasound assisted potassium permanganate pre-treatment of spent coffee waste
AU - Ravindran, Rajeev
AU - Jaiswal, Swarna
AU - Abu-Ghannam, Nissreen
AU - Jaiswal, Amit K.
N1 - Publisher Copyright:
© 2016 Elsevier Ltd
PY - 2017/1/1
Y1 - 2017/1/1
N2 - In the present study, novel pre-treatment for spent coffee waste (SCW) has been proposed which utilises the superior oxidising capacity of alkaline KMnO4 assisted by ultra-sonication. The pre-treatment was conducted for different exposure times (10, 20, 30 and 40 min) using different concentrations of KMnO4 (1, 2, 3, 4, 5% w/v) at room temperature with solid/liquid ratio of 1:10. Pretreating SCW with 4% KMnO4 and exposing it to ultrasound for 20 min resulted in 98% cellulose recovery and a maximum lignin removal of 46%. 1.7 fold increase in reducing sugar yield was obtained after enzymatic hydrolysis of KMnO4 pretreated SCW as compared to raw. SEM, XRD and FTIR analysis of the pretreated SCW revealed the various effects of pretreatment. Thermal behaviour of the pretreated substrate against the native biomass was also studied using DSC. Ultrasound-assisted potassium permanganate oxidation was found to be an effective pretreatment for SCW, and can be a used as a potential feedstock pretreatment strategy for bioethanol production.
AB - In the present study, novel pre-treatment for spent coffee waste (SCW) has been proposed which utilises the superior oxidising capacity of alkaline KMnO4 assisted by ultra-sonication. The pre-treatment was conducted for different exposure times (10, 20, 30 and 40 min) using different concentrations of KMnO4 (1, 2, 3, 4, 5% w/v) at room temperature with solid/liquid ratio of 1:10. Pretreating SCW with 4% KMnO4 and exposing it to ultrasound for 20 min resulted in 98% cellulose recovery and a maximum lignin removal of 46%. 1.7 fold increase in reducing sugar yield was obtained after enzymatic hydrolysis of KMnO4 pretreated SCW as compared to raw. SEM, XRD and FTIR analysis of the pretreated SCW revealed the various effects of pretreatment. Thermal behaviour of the pretreated substrate against the native biomass was also studied using DSC. Ultrasound-assisted potassium permanganate oxidation was found to be an effective pretreatment for SCW, and can be a used as a potential feedstock pretreatment strategy for bioethanol production.
KW - Alkaline potassium permanganate
KW - Biomass pretreatment
KW - Lignocellulose
KW - Reducing sugar
KW - Spent coffee waste
KW - Ultrasonication
UR - http://www.scopus.com/inward/record.url?scp=85006448729&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2016.11.034
DO - 10.1016/j.biortech.2016.11.034
M3 - Article
C2 - 27866804
AN - SCOPUS:85006448729
SN - 0960-8524
VL - 224
SP - 680
EP - 687
JO - Bioresource Technology
JF - Bioresource Technology
ER -
