Visible and NIR Photothermal Performance of CoSb3 Nanoparticles and Their Composites with Biochars of Different Trees
摘要
Photothermal property is the capability of some materials to absorb a specific wavelength of light and convert it into heat. In this study, CoSb3 nanoparticles were synthesized and their photothermal performance in the visible and infrared light (NIR) regions was investigated. In the visible region, by irradiating visible light to water containing CoSb3 nanoparticles with different concentrations of 0.062 g·L−1, 0.125 g·L−1, 0.25 g·L−1, and 0.5 g·L−1, it was observed that with increasing the concentration of nanoparticles, both the maximum water temperature and the slope of the increase in water temperature increase. In the NIR region, with 808 nm laser irradiation to a water solution containing 1 g·L−1 of CoSb3, the temperature increase reached 56.7 °C, which can be used for photothermal therapy. Also, biochar from different trees, including eucalyptus, conocarpus, olive and ziziphus, was used as a porous black photothermal layer floating on the water surface to increase the efficiency of converting light into heat. The results showed that all biochars have good photothermal performance and a water temperature increase of 13.1 °C to 17.5 °C was achieved. Also, to synergize the effects, biochars were decorated with CoSb3 nanoparticles at a concentration of 0.5 g·L−1. A maximum temperature increase of 19.3 °C and water mass decrease of 1.30 kg·m−2 was achieved for decorated ground ziziphus biochar.