Dataset for "Na/Cu-Doping Engineering of Carbon Nitride for High-Performance Visible-Light Degradation of Iopamidol"

Data collection method:

Photodegradation experiments of Iopamidol was carried out under visible light irradiation (450W LED Lamp) by suspending up to 20mg of NaCu-g-C3N4 in a 100 mL solution containing 5mgL-1 Iopamidol dissolved in deionized water. The suspension was stirred in the dark for 30 minutes to achieve adsorption–desorption equilibrium. Subsequently, 5 mM H2O2 was added simultaneously with the activation of the LED light source, and 3 mL aliquots of the suspension were withdrawn at regular time intervals. The photocatalyst was separated from the suspension by passing the aliquots through a 0.45 µm membrane filter to ensure accurate measurement of the remaining Iopamidol concentration in the solution. Iopamidol concentration in the supernatant was determined using HPLC with a reversed-phase C18 column (4.6 × 250 mm, 5 µm) and a mobile phase of methanol and 0.1% acetic acid water in a 10:90 (V/V) ratio. The injection volume was 25μL. The chromatographic column was set at 35℃, and the UV detector's wavelength was 242 nm. The influence of solution pH on photodegradation was tested in the pH range of 3.0-12.0, with the starting pH adjusted by 0.05M HCl and 0.05M NaOH solutions. The impact of catalyst dosage was investigated using varying quantities of NaCu-g-C3N4 (0-20 mg). Zeta potential and electrical conductivity measurements were performed using a Zetasizer Ultra analyzer (Malvern Panalytical, UK). For each analysis, aqueous suspensions of NaCu-g-C3N4 and g-C3N4 were prepared in deionized water, ultrasonicated for 10 minutes to ensure homogeneous dispersion, and subsequently equilibrated for 5 minutes prior to measurement. The pH of the suspensions was adjusted using 1 M HCl and 1 M NaOH. All measurements were carried out at 25°C using folded capillary cells, and each reported value represents the mean of three independent determinations. The electrical conductivity of the suspensions was recorded simultaneously under identical experimental conditions to assess the ionic environment of the photocatalyst systems.