초록
<P><B>Abstract</B></P> <P>Nano-titanium dioxide (nanoTiO<SUB>2</SUB>) under ultraviolet irradiation (UV) followed by dilute sulfuric acid hydrolysis of sugarcane bagasse was used to enhance the production of biohydrogen and biomethane in a consecutive dark fermentation and anaerobic digestion. Different concentrations of 0.001, 0.01, 0.1 and 1g nanoTiO<SUB>2</SUB>/L under different UV times of 30, 60, 90 and 120min were used. Sulfuric acid (2%v/v) at 121°C was used for 15, 30 and 60min to hydrolyze the pretreated bagasse. For acidic hydrolysis times of 15, 30 and 60min, the highest total free sugar values were enhanced by 260%, 107%, and 189%, respectively, compared to samples without nanoTiO<SUB>2</SUB> pretreatment. The highest hydrogen production samples for the same acidic hydrolysis times showed 88%, 127%, and 25% enhancement. The maximum hydrogen production of 101.5ml/g VS (volatile solids) was obtained at 1g nanoTiO<SUB>2</SUB>/L and 120min UV irradiation followed by 30min acid hydrolysis.</P> <P><B>Highlights</B></P> <P> <UL> <LI> NanoTiO<SUB>2</SUB>–dilute H<SUB>2</SUB>SO<SUB>4</SUB> hydrolysis was used to enhance the fermentation of bagasse. </LI> <LI> Using nanoTiO<SUB>2</SUB> pretreatment, the acid hydrolysis time duration was reduced. </LI> <LI> Dark H<SUB>2</SUB> fermentation was enhanced up to 127% using nanoTiO<SUB>2</SUB> pretreatment. </LI> <LI> Biogas production was enhanced up to 74% compare to the raw bagasse. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>