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Isomorphous substitution of Zr in the framework of aluminosilicate HY by an electrochemical method: Evaluation by methylene blue decolorization

Paper ID Volume ID Publish Year Pages File Format Full-Text
46083 46429 2012 13 PDF Available
Title
Isomorphous substitution of Zr in the framework of aluminosilicate HY by an electrochemical method: Evaluation by methylene blue decolorization
Abstract

Isomorphous substitution of Zr in the framework of aluminosilicate HY occurred during the preparation of electrogenerated zirconia supported HY (EGZrO2/HY) catalyst via a simple electrochemical method. Dealumination accompanied by an ion exchange with Zr4+ formed SiOZr bond, which controlled the formation of active species EGZrO2 that influenced the efficiency of the photodecolorization of methylene blue (MB). An amount of 0.375 g L−1 1 wt% EGZrO2/HY was found to be the optimum dosage for 10 mg L−1 MB, which resulted in 97% decolorization after 6 h of contact time at pH 11. The kinetics study indicates that the reaction follows the Langmuir–Hinshelwood model, where the reaction may occur both on the surface of the catalyst and in the bulk solution. The mineralization of MB was measured by removal of chemical oxygen demand (COD), five days biochemical oxygen demand/chemical oxygen demand (BOD5/COD), and total organic carbon (TOC/TOC0), and the results obtained were 95%, 7.14, and 0.08, respectively. After five cycling runs, the catalyst was still stable and showed no leaching effect. This study is believed to be extendable to the synthesis of other catalysts with different characteristics and be used in various applications.

Graphical abstract.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Electrochemical method can generates nanosize zirconia in average of 8–18 nm. ► Isomorphous substitution of Al with Zr was taken place. ► A new structural model for EGZrO2/HY is proposed. ► SiOZr bonds were formed as evidenced by MAS NMR, XPS, and IR. ► 1 wt% EGZrO2/HY exhibited the best performance for the photodecolorization of MB.

Keywords
Isomorphous substitution; EGZrO2/HY; Electrochemical; Photodecolorization; Methylene blue
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Isomorphous substitution of Zr in the framework of aluminosilicate HY by an electrochemical method: Evaluation by methylene blue decolorization
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 125, 21 August 2012, Pages 311–323
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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Any Questions? feel free to contact us