Effect of nano-metal doped calcium peroxide on biomass pretreatment and green hydrogen production from rice straw

• Published in: Bioresource technology 2023-10, Vol.386, p.129489-129489, Article 129489
• Main Authors: Sivagurunathan, Periyasamy, Sahoo, Prakash C., Kumar, Manoj, Prakash Gupta, Ravi, Bhattacharyya, Debasis, Ramakumar, SSV
• Format: Article
• Language: English
• Subjects: acetic acid; Biohydrogen; biomass; butyric acid; Calcium peroxide; fermentation; Green pretreatment; hydrogen production; Lignocellulosic biomass; Nanoparticles; rice straw; synergism
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2023.129489

[Display omitted] •CaO2-metallic NP was applied for pretreatment and H2 production from RS.•MnO2-CaO2 NP addition was beneficial for biomass pretreatment and H2 production.•MnO2-CaO2 NP addition attained 16% lignin removal than hydrothermal treated RS.•MnO2-CaO2 NP supplementation modulating the acetate and butyrate mediated pathway. In this study, calcium peroxide was modified and doped with metal-based nanoparticles (NP) to enhance the efficiency of pretreatment and biohydrogen generation from RS. The findings revealed that the addition of MnO2-CaO2 NPs (at a dosage of 0.02 g/g TS of RS) had a synergistic effect on the breakdown of biomass and the production of biohydrogen. This enhancement resulted in a maximum hydrogen yield (HY) of 58 mL/g TS, accompanied by increased concentrations of acetic acid (2117 mg/L) and butyric acid (1325 mg/L). In contrast, RS that underwent pretreatment without the use of chemicals or NP exhibited a lower HY of 28 mL/g TS, along with the lowest concentrations of acetic acid (1062 mg/L) and butyric acid (697 mg/L). The outcome showed that supplementation of NP stimulated the pretreatment of RS and improved the formation of acetic and butyric acid through the regulation of metabolic pathways during acidogenic fermentation.