Uv 3100

The photocatalytic activity of the as-prepared Bi_1−x La_xCuSeO powder samples was evaluated by photodegrading Congo Red (CR, 100 mg/L) aqueous solution. Typically, 0.16 g photocatalyst powder was dispersed into 80 mL CR solution and stirred in dark for 2 h in advance to reach the adsorption-desorption equilibrium between the photocatalysts and organic dye molecules. Cooling-water bath and magnetic stirring were hold continuously to prevent thermal effect during the degradation process and to keep the uniformity. A 5 W LED with emission wavelength of 365 ± 5 nm was used as the UV light source, and a 300 W xenon lamp with 420 nm and 800 nm cut-off filters was used as visible and NIR light source, respectively. The incident light source was placed above the aqueous solution vertically with illumination intensity of about 78 mW/cm², 132 mW/cm², and 473 mW/cm² for UV, visible and NIR lights respectively at upper surface of the solution. At regular time intervals, 3 mL suspension was collected and centrifuged, and the residual CR concentration in the supernatant was analyzed by UV-vis spectrophotometer (UV-3100, Hitachi). For cycling runs, photocatalyst was centrifuged and collected followed by washing with deionized water and drying at 70 °C. The photocatalytic measurement was carried out under the same conditions as mentioned before.

All the chemicals and reagents were purchased from Sigma‐Aldrich without any further purification unless otherwise stated. HPLC purified ssDNA (5′‐SH‐polyA30‐3′, 5′‐SH‐AAAAA AAAAA AAAAA AAAAA AAAAA AAAAA‐3′) was purchased from TaKaRa Biotechnology Co. Ltd. The AuNPs (15 nm) were purchased from BBI Co. Ltd. Nano pure water (>18 MΩ, MilliQ) was used in all experiments.
Transmission electron microscopy (TEM) images were taken with a Tecnai instrument (FEI). Raman measurement was performed on the XPLORA (Horiba) Raman microscope system. The dark‐field measurements were carried out on an inverted microscope (Olympus IX71). UV‐vis absorption obtained with a UV‐3100 (Hitachi) UV‐vis spectrophotometer.

The photocatalytic activity of the prepared Bi₂O₂(CO₃)_1−xS_x powder samples was evaluated by photodegrading Congo Red (CR, 100 mg/L) aqueous solution.The reason we chose this concentration is because it is proper to evaluate the change of the color. 0.16 g photocatalyst powder specimen was dispersed into 80 mL CR solution and stirred in the dark for 2 h to reach theadsorption–desorption equilibrium between the photocatalysts and organic dye molecules. Magnetic stirringanda cooling-water bath were held continuously to prevent thermal effect during the degradation process and tokeep the uniformity. A 5W LED with emission wavelength of 365 ± 5 nm and a 300 W xenon lamp with 420 nm cut-off filters were used as the UV (365~800 nm) and visible light sources (420~800 nm), respectively.The incident light source was placed above the aqueous solution vertically, and the illumination intensity for UV and visible lights at upper surface of the solution were about 78 mW/cm² and 132 mW/cm². The photocatalytic processes were conducted under constant temperature, using ice water to cool the system. At the end of regular time intervals, 3 mL suspension was collected and centrifuged, and the residual CR concentrationin the supernatant fluid was analyzed by UV-vis spectrophotometer (UV−3100, Hitachi, Tokyo, Japan).