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Investigation of photocatalytic activity of pure strontium hydroxyapatite and its Ti-substituted and TiO2 loaded forms

Paper ID Volume ID Publish Year Pages File Format Full-Text
39048 45802 2015 9 PDF Available
Title
Investigation of photocatalytic activity of pure strontium hydroxyapatite and its Ti-substituted and TiO2 loaded forms
Abstract

•Strontium hydroxyapatite,SrHAP degrades p-nitrophenol upon irradiating with 365 nm•5 mol% Ti substitution shifts the absorbance edge of SrHAP from 320 to 340 nm•20 wt% TiO2 loading increases the absorbance edge to 353 nm•Order of activity is noted to be 20 wt% TiO2-SrHAP>5 mol% Ti-SrHAP > SrHAP.

Photocatalytic activity of Strontium hydroxyapatite (SrHAP) was tested taking the degradation of p-nitrophenol (pnp) as a model reaction and its activity was compared with that of modified SrHAP (Ti4+ Substituted SrHAP and TiO2 loaded SrHAP). The compounds were synthesized by reflux method and characterized by powder XRD, FT-IR, SEM, TEM, UV–vis DRS and BET surface area analyses. Absorption edge of SrHAP (∼320 nm) was found to be shifted to longer wavelength in the case of 5 mol%Ti-SrHAP and 20 wt% TiO2-SrHAP. The photodegradation of p-nitrophenol studied using 365 nm UV source showed the photocatalytic activity trend 20 wt%TiO2-SrHAP > Ti-SrHAP > SrHAP. Photodegradation intermediates were identified by UV–vis and HRLC-MS analysis and possible degradation pathways were proposed. Photocatalytic degradation of pnp catalyzed by SrHAP and TiO2 loaded SrHAP followed hydroquinone route whereas, the process catalyzed by Ti4+ substituted SrHAP followed catechol route.

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Keywords
Photocatalyst; Strontium hydroxyapatite; photodegradation; p-nitrophenol; Powder XRD
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 506, 5 October 2015, Pages 100–108
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
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Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us