Premium
Catalytic thionine photodecolorization kinetics in the presence of nanostructure zinc oxide at buffer and non‐buffer solutions
Author(s) -
Montazerozohori Morteza,
Malekhoseini Ameneh
Publication year - 2014
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.12051
Subject(s) - buffer (optical fiber) , thionine , zinc , buffer solution , reaction rate constant , chemistry , kinetics , buffer gas , catalysis , photocatalysis , oxide , irradiation , nuclear chemistry , materials science , analytical chemistry (journal) , inorganic chemistry , chromatography , optics , electrochemistry , organic chemistry , telecommunications , laser , physics , electrode , quantum mechanics , computer science , nuclear physics
Photocatalytic decolorization of thionine using nanostructure zinc oxide suspensions in various buffer and non‐buffer pHs under 400 W high pressure mercury lamp irradiation under aerobic condition has been performed. Some parameters such as, amount of nanophotocatalyst, irradiation time, buffer and non‐buffer initial pHs effect and initial concentration of dye in photoreactor cell have been investigated to obtain the optimum conditions at each buffer and non‐buffer initial pHs. Kinetic study suggested pseudo‐first‐order behavior for photodecolorization of dye at all considered pHs. The plots based on resultant data also showed that the photocatalytic processes obey from Langmuir‐Hinshelwood kinetic model. Ultimately, the observed rate constants ( k obs ) in the range of 1.20 × 10 −2 − 1.15 × 10 −1 and 1.46 × 10 −2 − 7.69 × 10 −2 min −1 , photodecolorization rate constants ( k r ) in the range of 1.39–26.12 and 1.04–149.25 mg min −1 L −1 , and adsorption constants ( K A ) in the range of 3.60 × 10 −3 − 7.39 × 10 −3 and 6.16 × 10 −4 − 2.43 × 10 −2 L. mg −1 were evaluated for non‐buffer and buffer media, respectively. © 2014 American Institute of Chemical Engineers Environ Prog, 34: 689–696, 2015