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Enhancement of photocatalytic activity of CaTiO3 through HNO3 acidification

Paper ID Volume ID Publish Year Pages File Format Full-Text
26177 43938 2016 9 PDF Available
Title
Enhancement of photocatalytic activity of CaTiO3 through HNO3 acidification
Abstract

•Enhancement of HNO3 acidification led to the increase of substitutional N.•Acidified CaTiO3 at pH 2 has the best photocatalytic activity among samples.•The kobs and |1 − NO–Ti–N/NTi–O–N+Ti–N–O| shows a negatively linear relationship.

CaTiO3 synthesized by the hydrothermal method was treated to improve its photocatalytic activity using the HNO3 acidification. Changes of morphology, structure, and composition of the acidified CaTiO3 were investigated through various means such as XRD, SEM, BET, FTIR, Raman spectra, XPS, and UV–vis DRS. The results show that the enhancement of HNO3 acidification led to the increase of substitutional N (O–Ti–N) compared to interstitial N (Ti–O–N and Ti–N–O) in the CaTiO3 lattice. The apparent first-order reaction constant (kobs) of methylene blue over the acidified CaTiO3 at pH 2 was the largest and increased by 1.0 times than that over the not-acidified CaTiO3, indicating that the acidified CaTiO3 at pH 2 has the best photocatalytic performance among as-prepared samples. A negatively linear relationship between kobs and |1 − NO–Ti–N/NTi–O–N+Ti–N–O| suggests that the improvement of photocatalytic activity of CaTiO3 by HNO3 acidification depends on synergistic effects of substitutional and interstitial N in CaTiO3 lattice.

Keywords
CaTiO3; HNO3; Substitutional N; Interstitial N
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Enhancement of photocatalytic activity of CaTiO3 through HNO3 acidification
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volumes 322–323, 15 May–1 June 2016, Pages 1–9
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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
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