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The synergistic effects of acid treatment and silver (Ag) loading for substantial improvement of photoelectrochemical and photocatalytic activity of Na2Ti3O7/TiO2 nanocomposite

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Abstract
This study investigated the effects of acid treatment and silver (Ag) loading on a Na2Ti3O7/TiO2 nanocomposite
(NTO) synthesized through a hydrothermal method to improve its photoelectrochemical (PEC) performance and
photodegradation of Rhodamine B (RhB). Due to the high specific surface area of this nanocomposite (199.06
m2
/gr) and the high dispersal of the Ag nanoparticles on the surface of the catalyst, the best photocatalytic
efficiency was obtained by using a very small percentage of optimized silver loading. The changes in the
morphology, chemical state, and optical property of the NTO caused by the acid treatment and Ag loading were
investigated by different analyses. Under visible light irradiation, 97.3% of the RhB in the aqueous solution was
photodegraded by the optimized NTO with 0.1 M HCl treatment and 0.5 wt% Ag loading (NTOH0.1/Ag0.5),
which is substantially higher than that photodegraded by the pristine NTO. The PEC properties of the NTOH0.1/
Ag0.5 photoanode showed 2.7 times higher photocurrent density than that of untreated NTO. Combined analyses
of Mott-Schottky plots and electrochemical impedance spectroscopy (EIS) of the NTOH0.1/Ag0.5 nanocomposite
confirmed that the acid treatment and silver (Ag) loading increased both the donor concentration (ND) and the
charge carrier transfer efficiency, resulting in substantially improved PEC performance.
Author(s)
이병규콜라이 모르테자M. Tayebi
Issued Date
2021
Type
Article
Keyword
Na2Ti3O7/TiO2 nanocompositeAcid treatmentsSilver (Ag) loadingRecombinationPlasmonic effec
DOI
10.1016/j.apsusc.2020.148359
URI
https://oak.ulsan.ac.kr/handle/2021.oak/9255
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_crossref_primary_10_1016_j_apsusc_2020_148359&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,The%20synergistic%20effects%20of%20acid%20treatment%20and%20silver%20(Ag)%20loading%20for%20substantial%20improvement%20of%20photoelectrochemical%20and%20photocatalytic%20activity%20of%20Na2Ti3O7%2FTiO2%20nanocomposite&offset=0&pcAvailability=true
Publisher
APPLIED SURFACE SCIENCE
Location
네덜란드
Language
영어
ISSN
0169-4332
Citation Volume
540
Citation Number
1
Citation Start Page
148359
Citation End Page
148359
Appears in Collections:
Engineering > Civil and Environmental Engineering
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