title: Phosphomolybdic acid and ferric iron as efficient electron mediators for coupling biomass pretreatment to produce bioethanol and electricity generation from wheat straw.
abstract: Phosphomolybdic acid (PMo12) was used as an electron mediator and proton carrier to mediate biomass pretreatment for ethanol production and electricity generation from wheat straw. In the pretreatment, lignin was oxidized anaerobically by PMo12with solubilization of a fraction of hemicelluloses, and the PMo12was simultaneously reduced. In an external liquid flow cell, the reduced PMo12was re-oxidized with generation of electricity. The effects of several factors on pretreatment were investigated for optimizing the conditions. Enzymatic conversion of cellulose and xylan were about 80% and 45%, respectively, after pretreatment of wheat straw with 0.25M PMo12, at 95°C for 45min. FeCl3was found to be an effective liquid mediator to transfer electrons to air, the terminal electron acceptor. By investigating the effects of various operation parameters and cell structural factors, the highest output power density of about 11mW/cm2was obtained for discharging of the reduced PMo12.
authors.affiliation: Institute of Applied Chemistry, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Ding
authors.affiliation: Institute of Applied Chemistry, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Du
authors.affiliation: Institute of Applied Chemistry, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China; Tsinghua Innovation Center in Dongguan, Dongguan 523808, China. Electronic address: zhaoxb@mail.tsinghua.edu.cn.
authors.forename: Xuebing
authors.initials: X
authors.lastname: Zhao
authors.affiliation: USDA Forest Service, Forest Products Lab, 1 Gifford Pinchot Dr, Madison, WI 53726, USA.
authors.forename: J Y
authors.initials: JY
authors.lastname: Zhu
authors.affiliation: Institute of Applied Chemistry, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China; Tsinghua Innovation Center in Dongguan, Dongguan 523808, China.
authors.forename: Dehua
authors.initials: D
authors.lastname: Liu
mesh_terms: D056804:Biofuels; D018533:Biomass; D001709:Biotechnology / Q000379:methods*; D050260:Carbohydrate Metabolism / Q000187:drug effects; D002480:Cellulase / Q000378:metabolism; D002482:Cellulose / Q000378:metabolism; D004560:Electricity; D004583:Electrons; D000431:Ethanol / Q000378:metabolism; D005285:Fermentation / Q000187:drug effects; D006868:Hydrolysis; D007501:Iron / Q000494:pharmacology*; D008982:Molybdenum / Q000494:pharmacology*; D010084:Oxidation-Reduction; D010756:Phosphoric Acids / Q000494:pharmacology*; D013997:Time Factors; D014908:Triticum / Q000737:chemistry*; D014866:Waste Products
chemical_list: D056804:Biofuels; D010756:Phosphoric Acids; D014866:Waste Products; D000431:Ethanol; D008982:Molybdenum; D002482:Cellulose; D007501:Iron; D002480:Cellulase; C003125:phosphomolybdic acid
keywords: Direct lignin-to-electricity conversion; Electron mediator; Enzymatic hydrolysis; Lignocellulosic biomass; Phosphomolybdic acid; Pretreatment