The solid fraction obtained from lignocellulose fractionation contained mainly cellulose and was used as a feedstock in photocatalysis following depolymerisation via cellulase pretreatment. The depolymerised glucose and cellobiose are suitable electron donors in semiconductor suspension systems, and their valorisation has been previously reported. Specifically, the solid fraction was enzyme pre-treated with cellulase (0.05 mgcellulase mgsolid - 1 ) to generate soluble sugars, predominantly glucose (39.3±4.7 mM) and cellobiose (8.7±2.1 mM) after 24 h incubation at 37 °C in an aqueous sodium acetate buffer solution (50 mM) at pH 5. With respect to white birch, 10.2±0.4 wt% and 4.2±0.6 wt% were converted to glucose and cellobiose, respectively (see Tables and).