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Various factors affecting photodecomposition of methylene blue by iron-oxides in an oxalate solution.
Water Res. 2010 May; 44(9):2876-84.WR

Abstract

The effect of various factors on the photodecomposition of methylene blue (MB) by iron oxides calcined at various temperatures in various concentrations of oxalate solutions was investigated by illuminating with UV, visible and solar radiation. Iron oxides were prepared by a gel evaporation method and calcined at 200-700 degrees C. XRD showed that the as-synthesized iron oxides were amorphous, but formed maghemite (gamma-Fe(2)O(3)) at 200-400 degrees C and hematite (alpha-Fe(2)O(3)) at > or =500 degrees C. The effect of the various iron oxides, their contents, the oxalate concentration and wavelength of the light source (UV, visible and solar) were all found to strongly influence MB photodecomposition. The optimal contents of the iron oxides increased greatly from 25 to 2000 mg/L at higher calcining temperatures. The MB photodecomposition rate at each optimal iron oxide content was related to the calcining temperature in the order 700 degrees C<uncalcined<500 degrees C<400 degrees C<300 degrees C. The MB degradation was confirmed to occur by visible light illumination. Excellent photodecomposition was found at pH 2-5, but the photodegradation decreased greatly at pH>6, consistent with the presence of iron-oxalate complexes. A much higher concentration of hydroxyl radicals was generated in the present system compared with those from a commercial TiO(2) (ST-01), as determined by the coumarin method. Since this process does not require the addition of hydrogen peroxide and shows good efficiency even under solar light, it is an economically viable method for pre-treating and/or decolorizing wastewaters containing dyes.

Authors+Show Affiliations

Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology, O-okayama, Meguro, Tokyo, Japan.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

20188391

Citation

Gulshan, Fahmida, et al. "Various Factors Affecting Photodecomposition of Methylene Blue By Iron-oxides in an Oxalate Solution." Water Research, vol. 44, no. 9, 2010, pp. 2876-84.
Gulshan F, Yanagida S, Kameshima Y, et al. Various factors affecting photodecomposition of methylene blue by iron-oxides in an oxalate solution. Water Res. 2010;44(9):2876-84.
Gulshan, F., Yanagida, S., Kameshima, Y., Isobe, T., Nakajima, A., & Okada, K. (2010). Various factors affecting photodecomposition of methylene blue by iron-oxides in an oxalate solution. Water Research, 44(9), 2876-84. https://doi.org/10.1016/j.watres.2010.01.040
Gulshan F, et al. Various Factors Affecting Photodecomposition of Methylene Blue By Iron-oxides in an Oxalate Solution. Water Res. 2010;44(9):2876-84. PubMed PMID: 20188391.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Various factors affecting photodecomposition of methylene blue by iron-oxides in an oxalate solution. AU - Gulshan,Fahmida, AU - Yanagida,Sayaka, AU - Kameshima,Yoshikazu, AU - Isobe,Toshihiro, AU - Nakajima,Akira, AU - Okada,Kiyoshi, Y1 - 2010/02/10/ PY - 2009/09/21/received PY - 2010/01/28/revised PY - 2010/01/30/accepted PY - 2010/3/2/entrez PY - 2010/3/2/pubmed PY - 2010/8/14/medline SP - 2876 EP - 84 JF - Water research JO - Water Res VL - 44 IS - 9 N2 - The effect of various factors on the photodecomposition of methylene blue (MB) by iron oxides calcined at various temperatures in various concentrations of oxalate solutions was investigated by illuminating with UV, visible and solar radiation. Iron oxides were prepared by a gel evaporation method and calcined at 200-700 degrees C. XRD showed that the as-synthesized iron oxides were amorphous, but formed maghemite (gamma-Fe(2)O(3)) at 200-400 degrees C and hematite (alpha-Fe(2)O(3)) at > or =500 degrees C. The effect of the various iron oxides, their contents, the oxalate concentration and wavelength of the light source (UV, visible and solar) were all found to strongly influence MB photodecomposition. The optimal contents of the iron oxides increased greatly from 25 to 2000 mg/L at higher calcining temperatures. The MB photodecomposition rate at each optimal iron oxide content was related to the calcining temperature in the order 700 degrees C<uncalcined<500 degrees C<400 degrees C<300 degrees C. The MB degradation was confirmed to occur by visible light illumination. Excellent photodecomposition was found at pH 2-5, but the photodegradation decreased greatly at pH>6, consistent with the presence of iron-oxalate complexes. A much higher concentration of hydroxyl radicals was generated in the present system compared with those from a commercial TiO(2) (ST-01), as determined by the coumarin method. Since this process does not require the addition of hydrogen peroxide and shows good efficiency even under solar light, it is an economically viable method for pre-treating and/or decolorizing wastewaters containing dyes. SN - 1879-2448 UR - https://www.unboundmedicine.com/medline/citation/20188391/Various_factors_affecting_photodecomposition_of_methylene_blue_by_iron_oxides_in_an_oxalate_solution_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0043-1354(10)00082-5 DB - PRIME DP - Unbound Medicine ER -