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Zirconium based metal-organic framework in-situ assisted hydrothermal pretreatment and enzymatic hydrolysis of Platanus X acerifolia exfoliating bark for bioethanol production

Ibrahim Nasser Ahmed, Xiu-Li Yang, Amare Aregahegn Dubale, Rong Shao, Rong-Feng Guan, Xiangming Meng, Ming-Hua Xie
Bioresource technology 2019 v.280 pp. 213-221
Platanus acerifolia, bark, biomass, coordination polymers, enzymatic hydrolysis, ethanol, ethanol production, furfural, hot water treatment, hydroxymethylfurfural, lignocellulose, porosity, reducing sugars, surface area, temperature, zirconium
Metal-organic framework (MOF) assisted hydrothermal pretreatment and co-catalysis strategy based on UiO-66 MOF is developed for the first time. The Planetree exfoliating bark was pretreated with or without UiO-66 assisted hydrothermal method at a temperature ranging from 160 to 240 °C for 1–3 h residence. With the rise of pretreatment severity, the total reducing sugar (TRS) was increased till reached maximum, 180 mg g⁻¹, in the presence of UiO-66. The fitting models validate the optimal hydrothermal condition was at 180 °C and 1 h, which was characterized with high TRS and very low yield of furfural and HMF. The TRS from enzymatic hydrolysis reaches maximum, 391 mg g⁻¹, in the presence of MOF co-catalysis and the maximum ethanol yield achieved was 73%. Altered morphology, higher surface area and porosity are noticed after MOF assisted hydrothermal pretreatment. This study insights the MOFs’ application in lignocellulose biomass processing.