title: Enhancement of enzymatic hydrolysis and Klason lignin removal of corn stover using photocatalyst-assisted ammonia pretreatment.
abstract: Photocatalyst-assisted ammonia pretreatment was explored to improve lignin removal of the lignocellulosic biomass for effective sugar conversion. Corn stover was treated with 5.0-12.5 wt.% ammonium hydroxide, two different photocatalysts (TiO(2) and ZnO) in the presence of molecular oxygen in a batch reactor at 60 °C. Various solid-to-liquid ratios (1:20-1:50) were also tested. Ammonia pretreatment assisted by TiO(2)-catalyzed photo-degradation removed 70 % of Klason lignin under the optimum condition (12.5 % ammonium hydroxide, 60 °C, 24 h, solid/liquid=1:20, photocatalyst/biomass=1:10 with oxygen atmosphere). The enzymatic digestibilities of pretreated corn stover were 85 % for glucan and 75 % for xylan with NH(3)-TiO(2)-treated solid and 82 % for glucan and 77 % for xylan with NH(3)-ZnO-treated solid with 15 filter paper units/g-glucan of cellulase and 30 cellobiase units/g-glucan of β-glucosidase, a 2-13 % improvement over ammonia pretreatment alone.
authors: Department of Biological Systems Engineering, University of Wisconsin-Madison, Madison, WI 53701, USA.
authors: Chang Geun
authors: CG
authors: Yoo
authors: Chao
authors: C
authors: Wang
authors: Chenxu
authors: C
authors: Yu
authors: Tae Hyun
authors: TH
authors: Kim
mesh_terms: D064753:Ammonium Hydroxide; D055162:Biocatalysis; D018533:Biomass; D019149:Bioreactors; D002480:Cellulase / Q000737:chemistry; D005285:Fermentation; D006868:Hydrolysis; D006878:Hydroxides / Q000737:chemistry*; D008031:Lignin / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D010782:Photolysis; D035261:Plant Components, Aerial / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry; D003313:Zea mays / Q000737:chemistry*; D015034:Zinc Oxide / Q000737:chemistry; D001617:beta-Glucosidase / Q000737:chemistry
chemical_list: D006878:Hydroxides; C009495:titanium dioxide; D064753:Ammonium Hydroxide; D008031:Lignin; D014025:Titanium; D001617:beta-Glucosidase; D002480:Cellulase; D010100:Oxygen; D015034:Zinc Oxide