Kinetic study of methylene blue photocatalytic decolorization using zinc oxide under UV-LED irradiation

THE 14TH JOINT CONFERENCE ON CHEMISTRY 2019 Pub Date : 2020-06-02 DOI:10.1063/5.0005263

Riki Subagyo, Y. Kusumawati, W. Widayatno

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引用次数: 6

Abstract

Kinetic study of methylene blue photocatalytic decolorization using zinc oxide was carried out under UV-LED lamp irradiation. Zinc oxide was prepared by precipitation method. Zinc oxide was characterized by XRD, FESEM, and N2 adsorption-desorption. Characterization results show that zinc oxide has a hexagonal crystal face, particle size between 0.125-0.3 µm, specific surface area (SBET), micropore volume, and mesopore volume are 60.20 m2/g, 0.541 cm3/g, and 0.02 cm3/g, respectively. The variations of pH and concentration of methylene blue solution were observed. The results show that the alkaline conditions had the highest methylene blue photocatalytic decolorization rate. At initial low concentration, the methylene blue photocatalytic decolorization is very high and decrease when the initial concentration of methylene blue increase. Photocatalytic decolorization reaction kinetics follow the first-order kinetic. The Langmuir-Hinshelwood kinetic analysis results show that photocatalytic reaction constant and Langmuir-Hinshelwood constant value are 2.2621 L.mg−1.min−1 and 0.0144 L.mg-1, respectively.

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UV-LED照射下氧化锌光催化亚甲基蓝脱色的动力学研究

在UV-LED灯照射下，对氧化锌光催化亚甲基蓝脱色的动力学进行了研究。采用沉淀法制备氧化锌。采用XRD、FESEM、N2吸附-脱附等方法对氧化锌进行了表征。表征结果表明，氧化锌具有六方晶面，粒径在0.125 ~ 0.3µm之间，比表面积(SBET)、微孔体积(0.541 cm3/g)和中孔体积(0.02 cm3/g)分别为60.20 m2/g、0.541 cm3/g。观察了亚甲基蓝溶液pH和浓度的变化。结果表明，碱性条件下亚甲基蓝光催化脱色率最高。在初始浓度较低时，亚甲基蓝光催化脱色率很高，随着初始浓度的增加而降低。光催化脱色反应动力学服从一级动力学。Langmuir-Hinshelwood动力学分析结果表明，光催化反应常数和Langmuir-Hinshelwood常数均为2.2621 L.mg−1。min−1和0.0144 L.mg-1。

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THE 14TH JOINT CONFERENCE ON CHEMISTRY 2019

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