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TiO₂水悬浮液中偶氮染料光催化脱色动力学的非线性回归分析

Nonlinear regression analysis of kinetics of the photocatalytic decolorization of an azo dye in aqueous TiO2 slurry.

作者信息

Behnajady Mohammad A, Modirshahla Nasser

机构信息

Research Laboratory, Department of Applied Chemistry, Islamic Azad University, Tabriz Branch, P.O. Box 1655, Tabriz, I.R. Iran.

出版信息

Photochem Photobiol Sci. 2006 Nov;5(11):1078-81. doi: 10.1039/b610574b. Epub 2006 Oct 16.

DOI:10.1039/b610574b
PMID:17077905
Abstract

The kinetics of decolorization of an anionic monoazo dye of acid class named C.I. Acid Red 27 (AR27) was investigated in the UV/TiO2 process with nonlinear regression analysis. The experimental results indicated that the kinetics of decolorization of AR27 in this process fit well by pseudo-first order kinetics. With nonlinear regression analysis a model was developed for pseudo-first order rate constant (k(ap,UV/TiO2)) as a function of operational parameters such as TiO2 dosage, initial concentration of AR27, concentration of O2 and UV-light intensity (I0) as following: k(ap,UV/TiO2) = 0.0025 TiO2 [AR27]0(-0.96) O2I0. This rate expression can be used for predicting k(ap,UV/TiO2) at different conditions.

摘要

采用非线性回归分析方法，研究了紫外光/二氧化钛工艺中一种酸性阴离子单偶氮染料（C.I.酸性红27，简称AR27）的脱色动力学。实验结果表明，该工艺中AR27的脱色动力学符合准一级动力学。通过非线性回归分析，建立了准一级反应速率常数（k(ap,UV/TiO2)）与操作参数（如二氧化钛用量、AR27初始浓度、氧气浓度和紫外光强度（I0））之间的函数关系模型，如下所示：k(ap,UV/TiO2) = 0.0025 TiO2 [AR27]0(-0.96) O2I0 。该速率表达式可用于预测不同条件下的k(ap,UV/TiO2) 。

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