Photocatalytic degradation of an organic dye in some aqueous buffer solutions using nano titanium dioxide: A kinetic study

• Autorzy: Montazerozohori M. , Nasr-Esfahani M. , Joohari S.
• Języki publikacji: EN

Abstrakty

EN

Photocatalytic degradation of an organic dye, emerald green, on nano titanium dioxide (anatase 99.5%) at basic buffer pH of 7, 8 and 9 has been investigated. The effects of various operating parameters such as initial concentration of dye, catalyst dosage, bufferic pH and irradiation time on photocatalytic degradation have been studied in a photoreactor cell containing high pressure mercury lamp to obtain the optimum conditions. COD removal was found to be 65-71% confirming considerable mineralization. The photodegradation of the dye obeyed a pseudo-first order kinetics according to the Langmuir-Hinshelwood model at all used buffer pH. The observed rate constants (K_obs) of photocatalytic degradation were 3.3 ×10^-2 min^-1, 7.09 × 10^-2 min^-1 and 1.32 × 10^-1 min^-1 at buffer pH of 7-9 respectively. Furthermore, the Langmuir-Hinshelwood rate constants, k_r and adsorption constants, K_A are reported for current process at various buffer pH.

Słowa kluczowe

EN

adsorption; photodegradation; rate constants; titanium dioxide; adsorption constant; kinetic study; organic dye; photocatalytic degradation; Langmuir-Hinselwood kinetics; Langmuir-Hinshelwood

PL

adsorpcja; fotodegradacja; stałe szybkości; dwutlenek tytanu; ditlenek tytanu; stałe adsorpcji; kinetyka reakcji; barwniki organiczne; rozkład fotokataliczny; kinetyka Langmuira-Hinshelwooda

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Environment Protection Engineering
• Rocznik: 2012
• Tom: Vol. 38, nr 3
• Strony: 45--55
• Opis fizyczny: Bibliogr. 34, tab., rys.

Twórcy

autor

Montazerozohori M.

• Department of Chemistry, Yasouj University, Yasouj, 75914-353, Iran

autor

Nasr-Esfahani M.

• Department of Chemistry, Yasouj University, Yasouj, 75914-353, Iran

autor

Joohari S.

• Department of Basic Science, Yasouj Branch, Islamic Azad University, Yasouj, Iran

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