The integration of photocatalytic processes to simultaneously convert plastic waste into valuable chemicals and generate green hydrogen represents a significant advancement in the field of renewable energy and environmental remediation. The study demonstrated the potential of solar-powered photocatalytic processes to convert plastic waste, specifically polylactic acid (PLA), into value-added chemicals like pyruvate while simultaneously producing green hydrogen. The use of a CZS/NiPS 3 heterojunction as a catalyst was pivotal, as it created an efficient interface for electron transfer, enhancing the overall photocatalytic activity. The CZS/NiPS 3 -20 % catalyst exhibited remarkable performance, producing 777.4 mmol/g of hydrogen over 10 h in a pretreated PLA solution. In a real PLA plastic system, the catalyst generated 506.41 mmol/g of hydrogen over the same period, showcasing its practical applicability. The catalyst facilitated the selective photoreforming of PLA into pyruvate, a high-value chemical, as confirmed by GC-MS analysis. This dual functionality-hydrogen production and chemical conversion-maximizes the utilization of photogenerated electrons and holes, improving the overall efficiency of the process. This research offers a strategy to address plastic pollution and boost the hydrogen economy by converting waste into valuable products and using seawater for clean energy.
The persistent hurdles of charge rapid recombination, inefficient use of light and utilization of sacrificial reagents have plagued the field of photocatalytic hydrogen evolution (PHE). In this research, tiny MoO 2 nanoparticles of 10 nm in diameter were prepared through a straightforward solvothermal approach with a specific ratio of oleylamine and oleic acid as stabilizers. The critical factor in the synthesis process was found to be the ratio of oleylamine to oleic acid. Moreover, a two-phase interface assembly method facilitated the uniform deposition of MoO 2 onto CdS nanorods. Due to the localized plasmonic-thermoelectric effect on the surface of MoO 2 along with its abundant oxygen vacancies , the composite catalyst exhibited outstanding photo-utilization efficiency and an abundance of active sites. The CdS-MoO 2 composite displayed a unique photochemical property in transforming lactic acid into pyruvic acid and generating hydrogen simultaneously. After exposure to artificial sunlight for 4 h, significant values of 4.7 and 3.7 mmol⋅g −1 ⋅h −1 were achieved for hydrogen production and pyruvic acid formation, respectively, exceeding CdS alone by 3.29 and 4.02-fold, while the selectivity of pyruvic acid was 95.68 %. Furthermore, the S-Scheme electron transport mechanism in the composites was elucidated using Electron Paramagnetic Resonance (EPR) spectroscopy, radical trapping experiments, energy band structure analysis, and the identification of critical intermediates in the process of selective oxidation. This work sheds light on the design and preparation of high-performance photocatalysts for biorefining coupled with efficient hydrogen evolution.
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