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Bacteriorhodopsin (BR) is a light driven proton pump firstly found in the membrane of halophilic archaea. BR absorbs wide range of visible light with high quantum efficiency. To elucidate the sensitizing effect of BR, we tested the photocatalytic degradation of phenol with BR-sensitized TiO2 nanoparticles and compared with that of Alizarin red (AR). When the concentration of BR was 13.1 mg/L (4.9×10-7 mol/L), 23.8% of phenol was degradated after 2 hours of light irradiation. The degradation percentage was 3.5 times higher than that with TiO2 nanoparticles alone and similar to that sensitized by AR (20.1%). The possibilities and approaches to increase the sensitizing performance of BR were discussed.

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The CIGS thin films were prepared on ordinary soda lime glass substrates by pulsed laser deposition (PLD). The XRD and UV-visible spectrophotometer has been determined. The influence of different heat treatment temperature on crystal structure and optical properties has been studied. The results shows that heat treatment at 450°C, the films along the (112) plane preferential grow. The thin film’s structure is integrity, the film is in best crystallization conditions, band gap is 1.35eV and the film has a high visible light absorption efficiency.