Visible light photocatalytic activity of NaYF4:(Yb,Er)-CuO/TiO2 composite

Shielah Mavengere; Sang Chul Jung; Jung Sik Kim

doi:10.3390/catal8110521

Visible light photocatalytic activity of NaYF₄:(Yb,Er)-CuO/TiO₂ composite

Shielah Mavengere
, Sang Chul Jung
, Jung Sik Kim

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

TiO₂ photocatalysts are limited to ultraviolet light photo-activation, however, by coupling with NaYF₄:(Yb,Er) they can utilize visible light activation, but with low efficiencies. In order to enhance visible light photo-activity, CuO nanoparticles were coupled with NaYF₄:(Yb,Er) by mechanical ball-milling and coated with TiO₂-sol. The coupling of CuO nanoparticles with NaYF₄:(Yb,Er)/TiO₂ caused the formation of a NaYF₄:(Yb,Er)-CuO/TiO₂ composite capable of visible absorption with a remarkably reduced band gap of ~2.5 eV. The NaYF₄:(Yb,Er)-CuO/TiO₂ composite in H₂ O₂ showed the most efficient methylene blue (MB) degradation efficiency of more than 99.5% after exposure to visible light.

Original language	English
Article number	521
Journal	Catalysts
Volume	8
Issue number	11
DOIs	https://doi.org/10.3390/catal8110521
State	Published - 5 Nov 2018

Keywords

Composites
NaYF:(Yb,Er)-CuO/TiO
Photocatalyst
Visible light

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10.3390/catal8110521

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title = "Visible light photocatalytic activity of NaYF4:(Yb,Er)-CuO/TiO2 composite",

abstract = "TiO2 photocatalysts are limited to ultraviolet light photo-activation, however, by coupling with NaYF4:(Yb,Er) they can utilize visible light activation, but with low efficiencies. In order to enhance visible light photo-activity, CuO nanoparticles were coupled with NaYF4:(Yb,Er) by mechanical ball-milling and coated with TiO2-sol. The coupling of CuO nanoparticles with NaYF4:(Yb,Er)/TiO2 caused the formation of a NaYF4:(Yb,Er)-CuO/TiO2 composite capable of visible absorption with a remarkably reduced band gap of \textasciitilde{}2.5 eV. The NaYF4:(Yb,Er)-CuO/TiO2 composite in H2 O2 showed the most efficient methylene blue (MB) degradation efficiency of more than 99.5\% after exposure to visible light.",

keywords = "Composites, NaYF:(Yb,Er)-CuO/TiO, Photocatalyst, Visible light",

author = "Shielah Mavengere and Jung, \{Sang Chul\} and Kim, \{Jung Sik\}",

note = "Publisher Copyright: {\textcopyright} 2018 by the authors. Licensee MDPI, Basel, Switzerland.",

year = "2018",

month = nov,

day = "5",

doi = "10.3390/catal8110521",

language = "English",

volume = "8",

journal = "Catalysts",

issn = "2073-4344",

publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",

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TY - JOUR

T1 - Visible light photocatalytic activity of NaYF4:(Yb,Er)-CuO/TiO2 composite

AU - Mavengere, Shielah

AU - Jung, Sang Chul

AU - Kim, Jung Sik

PY - 2018/11/5

Y1 - 2018/11/5

N2 - TiO2 photocatalysts are limited to ultraviolet light photo-activation, however, by coupling with NaYF4:(Yb,Er) they can utilize visible light activation, but with low efficiencies. In order to enhance visible light photo-activity, CuO nanoparticles were coupled with NaYF4:(Yb,Er) by mechanical ball-milling and coated with TiO2-sol. The coupling of CuO nanoparticles with NaYF4:(Yb,Er)/TiO2 caused the formation of a NaYF4:(Yb,Er)-CuO/TiO2 composite capable of visible absorption with a remarkably reduced band gap of ~2.5 eV. The NaYF4:(Yb,Er)-CuO/TiO2 composite in H2 O2 showed the most efficient methylene blue (MB) degradation efficiency of more than 99.5% after exposure to visible light.

AB - TiO2 photocatalysts are limited to ultraviolet light photo-activation, however, by coupling with NaYF4:(Yb,Er) they can utilize visible light activation, but with low efficiencies. In order to enhance visible light photo-activity, CuO nanoparticles were coupled with NaYF4:(Yb,Er) by mechanical ball-milling and coated with TiO2-sol. The coupling of CuO nanoparticles with NaYF4:(Yb,Er)/TiO2 caused the formation of a NaYF4:(Yb,Er)-CuO/TiO2 composite capable of visible absorption with a remarkably reduced band gap of ~2.5 eV. The NaYF4:(Yb,Er)-CuO/TiO2 composite in H2 O2 showed the most efficient methylene blue (MB) degradation efficiency of more than 99.5% after exposure to visible light.

KW - Composites

KW - NaYF:(Yb,Er)-CuO/TiO

KW - Photocatalyst

KW - Visible light

UR - https://www.scopus.com/pages/publications/85056363191

U2 - 10.3390/catal8110521

DO - 10.3390/catal8110521

M3 - Article

AN - SCOPUS:85056363191

SN - 2073-4344

VL - 8

JO - Catalysts

JF - Catalysts

IS - 11

M1 - 521

ER -

Visible light photocatalytic activity of NaYF₄:(Yb,Er)-CuO/TiO₂ composite

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Keywords

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