Immobilization of laccase and glucosidase on TiO2/CdS nanoparticles for enhanced H2 production from Spartina alterniflora Loisel

Abstract

Photocatalytic conversion of biomass wastes for sustainable biohydrogen generation is a promising method to address the energy and environmental pressures. However, the photo-generated intermediates have high reactive activity leading to the difficulties in controlling the stereoselectivities and chemoselectivities. The effective integration of photocatalysts and enzymes is recognized as an efficient strategy for biohydrogen production. Herein, a photo-enzyme composite catalyst by immobilizing laccase and glucosidase on TiO₂/CdS (denoted as LCβ@TiO₂/CdS) is first synthesized. The effect of the LCβ@TiO₂/CdS on the hydrogen conversion of Spartina alterniflora Loisel under different conditions (light, dark, and alternated light/dark cycle) was investigated. The results indicated that the LCβ@TiO₂/CdS had high delignification potential under lighting condition, and the maximum efficiency of 75.1 % emerged at the dose of 4 mg. Subsequently, under the light-dark co-SSF (Simultaneous Saccharification and Fermentation) with 20 min light-dark cycles (LDSSF), the H₂ yield reached 316 NmL/g VS after 48 h of reaction, and LCβ@TiO₂/CdS could be efficiently reused up to 4 cycles. Therefore, developed LCβ@TiO₂/CdS catalyst has a high potential for apply in biohydrogen production.