fulltext.study @t Gmail

Delaminated titanate and peroxotitanate photocatalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
46793 46449 2011 8 PDF Available
Title
Delaminated titanate and peroxotitanate photocatalysts
Abstract

Delaminated layered titanates are effective, versatile, robust and practical photocatalytic materials for degradation of organic and microbiological contaminants. In prior studies, these have generally been obtained from Cs-titanate lepidocrocite-analogue parent materials. In this study we show that delaminated sodium nonatitanate (SNT) is equally effective as the delaminated Cs-titanate; yet it is cheaper to synthesize and is obtained in about one-third as many processing steps. Two chemical modifications; ligation with peroxide and treatment with phosphate resulted in improved photodegradation of common dyes; bromophenol-blue and methyl-orange. Together these two dyes provided experimental conditions ranging from pH ∼4.5–9. All layered titanate materials proved to be more effective colloidal suspension photocatalysts than standard TiO2. Although most common characterization techniques could not distinguish significant differences between the different delaminated titanates (from different parent materials, with chemical modifications), band-gap measurement via UV–vis spectroscopy proved informative. Generally the closer the match between the band-gap and the UV-light source, the more effective the catalyst. Finally, these layered titanates were electrostatically adhered to a surface, and photocatalytic activity was retained in this form. Furthermore, in this surface-adsorbed form we could see clear morphological differences between the Cs-titanate and SNT derived materials, as well as measure the height of the adsorbed layers. All observations by Atomic Force Microscopy indicated that the titanates layers that adhere to mica have a thickness of 1–10 layers thick (∼1–4 nm). These materials in their surface-fixed forms are very promising for water treatment technologies.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► We compare photocatalytic activity of delaminated Cs-titanate and Na-titanate. ► They are comparably effective, yet Na-titanate is cheaper and easier to produce. ► Chemical modifications, peroxide and phosphate both enhance photocatalytic activity. ► Titanates electrostatically sorbed to a surface retain their photocatalytic activity.

Keywords
Photocatalysis; Layered-titanates; Peroxide; Sodium nonatitanate; Cs-titanate lepidocrocite
First Page Preview
Delaminated titanate and peroxotitanate photocatalysts
Get Full-Text Now
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
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 105, Issues 1–2, 9 June 2011, Pages 69–76
Authors
, , ,
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
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us