Replacing incandescent lamps with an LED panel for hydrogen production by photofermentation: Visible and NIR wavelength requirements

Rhodopseudomonas palustris-based conversion of organic acids to hydrogen using plasmonic nanoparticles and near-infrared light

“…Turon et al also found high hydrogen concentrations in the evolved gas from the Rhodobacter capsulatus cultures based on the above theoretical expectations with the evolved gas consisting of 97–99% H 2 . 21 C 2 H 4 O 2 + 2H 2 O → 2CO 2 + 4H 2 C 4 H 6 O 5 + 3H 2 O → 4CO 2 + 6H 2 …”

“…They attributed the drop in performance to self-shading effects; the NIR light was preferentially absorbed at the illuminated surface of the container, leaving deeper parts of the culture under-illuminated and decreasing the total hydrogen production. 21 In contrast, our experiments used a smaller culture size, i.e., 30 mL compared to 1 L and lower intensity illumination, i.e., 130 W m À2 compared to 1150 W m À2 . The smaller culture size could diminish the effects of self-shading and lead to reversal in the efficacy of NIR illumination, as shown in Fig.…”

“…NIR illumination alone. 21 Again, the intensity of the light sources did not match, which made the direct comparison of the light-to-hydrogen conversion efficiency difficult. Finally, we are unaware of prior studies that have compared hydrogen generation from the species considered here, namely, R. palustris under visible versus NIR illumination.…”

“… 20 Turon et al compared hydrogen production rates from a different species, Rhodobacter capsulatus , using different light sources and found that visible + NIR performed better than NIR illumination alone. 21 Again, the intensity of the light sources did not match, which made the direct comparison of the light-to-hydrogen conversion efficiency difficult. Finally, we are unaware of prior studies that have compared hydrogen generation from the species considered here, namely, R. palustris under visible versus NIR illumination.…”

Investigate the Function and Structure of (Fe,Cr) La2Ti2O7 Photocatalyst Calcined under the Nitrogen Atmosphere

“…The MB solution was prepared at a concentration of 1.8×10 −4 M. For each measurement, 0.01 g of the synthesized photocatalysts powder was added to 50 mL of the MB solution [22]. The re-action was performed in a black box with continuous stirring while exposed to LED light (EVE panel square, 18 W, Kenko L41 super pro (W) filter: light wavelength >400 nm) for a total of 180 min [23,24]. The photocatalytic activity was determined by measuring the MB degradation using UV-Vis spectroscopy (UV-Vis, model: CARY 300) equipped with a tungsten lamp as the light source.…”