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Published on: August 14, 2020
Upconversion Nanoparticles Expand the Photosynthetically Active Spectrum of Microalgae into the Near-Infrared for CO2
Jiale Wang1,2, Shiyan Ma1,2, Tao Huang1,2
1Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China.
Microalgae capture carbon dioxide more efficiently using upconversion nanoparticles that convert near-infrared light into usable energy. This biohybrid system boosts light absorption and photosynthetic rates for enhanced carbon fixation and biomass production.
Area of Science:
- Biotechnology
- Materials Science
- Environmental Science
Background:
- Microalgae are key in sustainable carbon capture, but their light absorption spectrum limits efficiency.
- The solar spectrum contains abundant near-infrared (NIR) light unusable by microalgae.
Purpose of the Study:
- To enhance microalgal photosynthetic carbon fixation using NIR light.
- To improve light utilization efficiency by converting NIR photons into photosynthetically active radiation.
Main Methods:
- Integration of NaErF4:Tm(0.5%)@NaYF4 upconversion nanoparticles with microalgae.
- Measurement of light absorption, photosynthetic rates, and biomass production.
Main Results:
- Enhanced light absorption in NIR regions (950-1000 nm and 1500-1600 nm) with red light emission.
- Significant increases in electron transport rate (20.18%), ATP (47.06%), NADPH (19.82%), and CO2 fixation (94.31%).
- 34.99% increase in light conversion efficiency, reaching 8.4%, and 19.67% rise in biomass density.
Conclusions:
- A novel biohybrid system effectively utilizes NIR light for microalgal photosynthesis.
- Upconversion nanoparticles enhance light harvesting and photosynthetic metabolism in microalgae.
- This approach offers a promising pathway for efficient microalgal-based carbon capture.
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