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首页> 外文期刊>Journal of the Indian Chemical Society >Langmuir-Hinshelwood (L-H) adsorption isotherm and photodegradation of copper surfactants derived from long chain saturated fatty acid catalyzed by zinc oxide
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Langmuir-Hinshelwood (L-H) adsorption isotherm and photodegradation of copper surfactants derived from long chain saturated fatty acid catalyzed by zinc oxide

机译:Langmuir-hinshelwood(L-H)吸附等温线和氧化锌催化长链饱和脂肪酸的铜表面活性剂的光降解

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摘要

Photocatalysis process is a relatively novel subject with tremendous potential in the near future because of its environmental applications. Large molecules such as copper stearate soap (CS) and copper palmitate (CP) cannot be metabolized rapidly by microorganisms naturally. Photocatalytic degradation has been considered to be an efficient and rapid process for the degradation of copper soaps derived from long chain saturated fatty acid. The zinc oxide as semiconductor can be effectively used as a catalyst for the photochemical degradation of surfactants causing environment pollution. The progress of the reaction has been monitored spectrophotometrically by measuring the absorbance of the reaction mixture at definite time intervals. Different parameters such as the concentration of soap, dose of semiconductor, light intensity, effect of solvent polarity were varied to achieve the optimum rate of photodegradation. The observations revealed that CS and CP soaps were degraded successfully by using ZnO under UV. The disappearance of copper surfactants follows a pseudo-first order kinetics according to the Langmuir-Hinshelwood (L-H) model. A tentative mechanism has been proposed for the photodegradation of copper surfactants.
机译:光催化过程是由于其环境应用,在不久的将来具有巨大潜力的相对新颖的主题。诸如铜硬脂酸皂(Cs)和铜棕榈酸铜(CP)的大分子不能通过微生物自然地代谢。光催化降解已被认为是衍生自长链饱和脂肪酸的铜皂的降解的有效快速的方法。作为半导体的氧化锌可以用作导致环境污染的表面活性剂的光化学劣化的催化剂。通过以明确的时间间隔测量反应混合物的吸光度,对反应的进展进行了分光光度法。不同的参数,例如皂,半导体剂量,光强度,溶剂极性的效果的浓度变化,以实现光降解的最佳速率。观察结果表明,通过在紫外线下使用ZnO成功地降解了Cs和CP肥皂。铜表面活性剂的消失遵循根据Langmuir-Hinshelwood(L-H)模型的伪第一阶动力学。已经提出了铜表面活性剂光降解的暂定机理。

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