Fig. 4: Enhanced photothermal performance.
From: Grave-to-cradle upcycling of Ni from electroplating wastewater to photothermal CO2 catalysis
a Diffuse reflectance spectra of different catalysts. b CO production rates of different samples illuminated with a Xe arc lamp supplemented with a light concentrator in the flow reactor. The power of the lamp was set to be 190, 200, and 210 W, corresponding to the light intensities of 28.3, 30.7, and 33.3 suns, respectively. Three data points were collected to obtain the average CO rate after 10 min illumination for each sample. c Surface temperature profiles of different samples illuminated with concentrated light from a Xe arc lamp. The power of the lamp was set to be 210 W. The equilibrium temperatures under illumination for SFe-Ni, SFe, SNi, and without catalyst were 401.8, 389.6, 295.3, and 180.8 °C, respectively. d CO production rates of different samples in the batch reactor illuminated with a Xe arc lamp supplemented with a light concentrator. The light intensity was 28 suns. The CO rates with the unit of ‘mmol·gNi−1·h−1’ for SFe-Ni in b, d were calculated based on the mass of Ni, and the activity of the isolated Fe component was deducted by subtracting the CO rate of SFe under the same testing condition. The red data points in b, d correspond to the selectivity towards production of CO.
