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Synthesis of MWCNT/MnO2 and their application for simultaneous oxidation of arsenite and sorption of arsenate

Paper ID Volume ID Publish Year Pages File Format Full-Text
47043 46457 2011 8 PDF Available
Title
Synthesis of MWCNT/MnO2 and their application for simultaneous oxidation of arsenite and sorption of arsenate
Abstract

It is well known that arsenite [As(III)] is less effectively removed than arsenate [As(V)] by most treatment technologies. Thus, pre-oxidation of As(III) to As(V) is required prior to adsorption. Here, the oxidation properties of manganese oxides with adsorption features of multiwall carbon nanotubes (MWCNTs) have been combined in a composite of MWCNT/MnO2. The composite was characterized by Fourier transform infrared absorption spectroscopy (FTIR), field emission scanning electron microscope (FESEM), and energy dispersive X-ray (EDX) and X-ray diffraction (XRD). In batch culture experiments, MWCNTs and the MWCNT/MnO2 composite were examined for As(III) and As(V). The results reveal that MnO2 in the composite plays a key role in enhancing As(III) removal and As(III) removal is not as effective as As(V) removal for MWCNTs. The retention of arsenite and arsenate is slightly pH dependent. The reported composite can be regenerated as it was confirmed by SEM and EDX analysis. The study could be considered as a model of preparation and investigation of a multifunctional material that can be used in wastewater treatment for removal of arsenic.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The composite of MWCNT/MnO2 was successfully synthesized. ► It combines the oxidation properties of MnO2 with adsorption features of MWCNTs. ► It shows high efficiency for removal of As(III) and As(V). ► The desorption process was successfully conducted.

Keywords
Carbon nanotubes/manganese oxide composite; Adsorption; Oxidation; Arsenic
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 106, Issues 1–2, 21 July 2011, Pages 46–53
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us