Fallen-leaf-sensitized biosolar oxygenation of hydrocarbons

Area of Science:

• Biomass Valorization
• Photocatalysis
• Green Chemistry

Background:

• Lignocellulosic wastes are abundant but underutilized due to complex structures requiring intensive pretreatment.
• Current methods for biomass valorization are energy- and water-intensive.

Purpose of the Study:

• To explore the potential of raw lignocellulosic wastes as photocatalysts for solar-driven reactions.
• To develop a sustainable method for producing hydrogen peroxide and functionalizing hydrocarbons using waste biomass.

Main Methods:

• Investigated the solar-powered oxygen reduction reaction (ORR) using various untreated lignocellulosic wastes.
• Identified fallen leaves from Platanus trees as efficient ORR photocatalysts due to their photophysical properties.
• Utilized a waste-enzyme hybrid catalyst for stereoselective hydroxylation and epoxidation of hydrocarbons using photogenerated H2O2.

Main Results:

• Demonstrated that raw lignocellulosic wastes can produce hydrogen peroxide (H2O2) using only O2, water, and light without pretreatment.
• Platanus fallen leaves showed high ORR rates attributed to superior photophysical properties.
• Achieved record high turnover frequency and total turnover number in hydrocarbon oxyfunctionalization using the waste-enzyme catalyst.

Conclusions:

• Raw biomass wastes can function as effective green photocatalysts for sustainable photobiosynthesis.
• This study presents a novel waste-to-wealth strategy, converting biomass waste into valuable chemicals through photocatalysis and biocatalysis.