RSC Advances
Paper
of hetero-junction electric eld among the g-C3N4/TiO2. The
transfers of electrons from g-C3N4 CB to TiO2 CB and further
from CB of TiO2 to silver was greatly suppressed the recom-
bination of electron–hole pairs. These photogenerated elec-
trons further react with adsorbed O2 on the catalyst surface to
form O2cꢀ radicals which further combine with H2O to
transforms to $OH radicals. In the meantime, the holes in g-
C3N4 VB was less positive than $OH/H2O redox potential
(2.68 eV vs. SHE),56 indicating that the holes on g-C3N4 may
not able to oxidize H2O into $OH radicals, while they directly
participate in the degradation. Meanwhile, holes on TiO2 VB
are more positive than $OH/H2O redox potential which could
react with H2O to generate highly reactive $OH radicals.
These O2cꢀ, $OH, h+ and eꢀ species are highly reactive
towards TS degradation to generate the degradation prod-
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Ag–TiO2@g-C3N4 composite under visible light.
W. Liu, Int. J. Hydrogen Energy, 2019, 44, 9348–9358.
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The present study deals with preparation of S and Ag doped
TiO2@g-C3N4 hybrid catalyst for efficient detoxication of triclosan.
The results suggested that the doped Ag, S atoms and hetero-
junction formation between TiO2 and g-C3N4 could remarkably
enhance the visible light activity. RSM modeling and optimization
of the process illustrated that catalyst weight and pH are the most
inuential factors in photocatalytic degradation of TS. Around
92.3% of degradation was achieved under the optimized conditions
aer 60 min by the prepared photocatalyst. The plausible degra-
dation pathway was proposed based on LC-ESI/MS results and the
biotoxicity test suggested that less toxic degradation products were
generated during the degradation. The strong interfacial contact
present in S/Ag–TiO2@g-C3N4 composite was highly retarded the
charge recombination. Thus, S/Ag–TiO2@g-C3N4 composites could
be possible photocatalyst prospect applied for degradation and
detoxication of various environmental pollutants.
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Conflicts of interest
There are no conicts to declare.
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Acknowledgements
This study was nancially supported by the Major Science and
Technology Program for Water Pollution Control and Treat-
ment (2018ZX07208010-01), Six Talent Peaks Project in Jiangsu
Province, and 333 Talent Project Foundation of Jiangsu
Province.
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