Abstract
CdS nanoparticles (NPs) were synthesized and briefly characterized by XRD, FTIR, BET, DRS, and SEM-EDX techniques. A cubic-zinc blende structure for CdS NPs was identified by XRD pattern. The EDX results confirmed an atomic percentage Cd: S ratio of 49:51 for the sample. The BET surface area, total pore volume, and the mean pore diameter of 120 m2/g, 0.1395 cm3/g, and 4.5 nm were also obtained, respectively. The absorption edge wavelength of 610 nm showed the bandgap energy (Eg) of 2.03 eV. The as-synthesized CdS NPs were then used in the photodegradation of ranitidine (RD). The simultaneous effects of the influencing variables were evaluated by designing the experiments by using a central composite design with response surface methodology (RSM) approach. The best RD degradation extent was obtained at a run including pH 6.2, catalyst dose of 0.6 g/L, 3.4 mg/L of ranitidine at irradiation time of 97.5 min. The high correlation coefficient (R2 = 0.9739) for the quadratic polynomial model, showed that the data predicted by RSM were in good agreement with those obtained in experimental runs. Finally, the COD and HPLC analysis of the photodegraded RD solutions confirmed the degradation of RD molecules. A rate constant value of 0.014 min−1 correspond to t1/2 value of 49.5 min was obtained by COD results for the mineralization of RD or its degradation intermediates.
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