Kinetic Study of Sodium Dodecylsulfate Degradation by Solar Heterogeneous Photocatalysis Based on Tungsten Oxide

Djedjess Essoh Jules-César Meledje, Y. A. Yobouet, Ange Victoire Mireille Loua, A. S. Ello, S. N. Eroi, Albert Trokourey
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Abstract

Sodium Dodecyl Sulfate or SDS is a chemical compound widely used in detergent and cosmetic formulations. This work describes the application of solar heterogeneous photocatalysis based on tungsten oxide (WO3) to the kinetic study of the degradation of sodium dodecylsulfate. The experiments were performed at room temperature to study the effect of the initial catalyst mass. The results showed that a small amount of tungsten oxide is sufficient to degrade sodium dodecyl sulfate. The initial concentrations of SDS varied between 5 and 15 mg.L-1. According to the results, more than 87% reduction is obtained after 120 min of solar irradiation of the SDS solution for a WO3/SDS mass ratio of 1/5. The detailed kinetic analysis of the photodegradation of sodium dodecylsulfate showed that the disappearance of the anionic surfactant follows a pseudo-prime model. According to the Langmuir-Hinshelwood model, the kinetics constant calculated from the linear form of this model are : k = 0.042 mg.L.min-1 and K = 0.060 L.mg-1.
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基于氧化钨的太阳能异质光催化技术降解十二烷基硫酸钠的动力学研究
十二烷基硫酸钠或 SDS 是一种广泛用于洗涤剂和化妆品配方的化合物。本研究介绍了基于氧化钨(WO3)的太阳能异相光催化技术在十二烷基硫酸钠降解动力学研究中的应用。实验在室温下进行,以研究初始催化剂质量的影响。结果表明,少量的氧化钨就足以降解十二烷基硫酸钠。SDS 的初始浓度在 5 至 15 mg.L-1 之间。结果表明,在 WO3/SDS 质量比为 1/5 的情况下,SDS 溶液经过 120 分钟的太阳照射后,降解率超过 87%。对十二烷基硫酸钠光降解的详细动力学分析表明,阴离子表面活性剂的消失遵循一个伪质子模型。根据 Langmuir-Hinshelwood 模型,该模型线性形式计算出的动力学常数为:k = 0.042 mg.L.min-1 和 K = 0.060 L.mg-1。
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