Optimization, kinetics and thermodynamics of photocatalytic degradation of Acid Red 1 by Sm-doped CdS under visible light

Add time:08/03/2019    Source:sciencedirect.com

Sm-doped CdS nanoparticles were synthesized through an ultrasound-assisted co-precipitation method and their photocatalytic efficiency was investigated by applying them to photodegradation of Acid Red 1 (AR1) under visible light. The effect of the operational factors on the photocatalytic process was systematically evaluated using response surface methodology. Under the optimal conditions ([AR1]0 = 15 mg L−1, [2% Sm-CdS]0 = 1 g L−1, pH = 4 and t = 94 min), >83% of the AR1 molecules were degraded. The kinetics of the process was well described by the Langmuir-Hinshelwood's pseudo-first-order model (kapp = 0.0163 min−1). Furthermore, thermodynamics of the process was demonstrated by the activated complex theory of Eyring, which declared that the photocatalytic process is endothermic and nonspontaneous in the temperature range of 25–45 °C. In addition, the main products and intermediates of AR1degradation were determined by the GC–MS technique.

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