![Kinetics of decolorization of an azo dye in UV alone and UV/H"2O"2 processes [An article from: Journal of Hazardous Materials]](https://www.ebooknetworking.net/books/B00/0PA/bigB000PAA71M.jpg)
Kinetics of decolorization of an azo dye in UV alone and UV/H"2O"2 processes [An article from: Journal of Hazardous Materials]
Description
This digital document is a journal article from Journal of Hazardous Materials, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
The decolorization of C.I. Acid Red 27 (AR27), a monoazo anionic dye, was studied in the ultraviolet radiation (UV) alone and UV plus hydrogen peroxide (UV/H"2O"2) processes. The experimental results indicated that the kinetics of both oxidation processes fit well by pseudo-first order kinetics. The reaction rate was sensitive to the operational parameters and increased with increasing H"2O"2 concentration and light intensity. The reaction orders of H"2O"2 concentration and light intensity in both processes were obtained with linear regression method. A regression model was developed for pseudo-first order rate constant (k"a"p","U"V"/"H"""2"O"""2) as a function of the H"2O"2 concentration and UV light intensity.k"a"p","U"V"/"H"""2"O"""2=(2x10^-^4I"0^0^.^7^5+k"3I"0^1^.^3^8[H"2O"2]"0^n)@f"A"R"2"7 As a result of two opposing effects of H"2O"2 concentration at low and high concentrations, n has a value of 0.49 and -0.39 and k"3 has a value of 3x10^-^4 and 0.1 for the regions of 0mgl^-^1
Description:
The decolorization of C.I. Acid Red 27 (AR27), a monoazo anionic dye, was studied in the ultraviolet radiation (UV) alone and UV plus hydrogen peroxide (UV/H"2O"2) processes. The experimental results indicated that the kinetics of both oxidation processes fit well by pseudo-first order kinetics. The reaction rate was sensitive to the operational parameters and increased with increasing H"2O"2 concentration and light intensity. The reaction orders of H"2O"2 concentration and light intensity in both processes were obtained with linear regression method. A regression model was developed for pseudo-first order rate constant (k"a"p","U"V"/"H"""2"O"""2) as a function of the H"2O"2 concentration and UV light intensity.k"a"p","U"V"/"H"""2"O"""2=(2x10^-^4I"0^0^.^7^5+k"3I"0^1^.^3^8[H"2O"2]"0^n)@f"A"R"2"7 As a result of two opposing effects of H"2O"2 concentration at low and high concentrations, n has a value of 0.49 and -0.39 and k"3 has a value of 3x10^-^4 and 0.1 for the regions of 0mgl^-^1
