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Bui, Thanh Son,Bansal, Palak,Lee, Byeong-Kyu,Mahvelati-Shamsabadi, Tahereh,Soltani, Tayyebeh Elsevier 2020 APPLIED SURFACE SCIENCE - Vol.506 No.-
<P><B>Abstract</B></P> <P>A novel photocatalyst, Ba-doped graphitic carbon nitride (g-C<SUB>3</SUB>N<SUB>4</SUB>), was synthesized via a facial thermal condensation method. Ba at a loading of 2% revealed the highest photocatalytic degradation efficiency of tetracycline (TC) (91.94%) after 120 min of visible light irradiation at an optimal pH of 10. An overall synergy of 69.26% was observed in the case of Ba (2%)-doped g-C<SUB>3</SUB>N<SUB>4</SUB> over pure g-C<SUB>3</SUB>N<SUB>4</SUB>. The remarkable improvement in the TC degradation performance is due to the narrower band-gap energy, the larger surface areas and the lower recombination rate of charge carriers detected through photoluminescence (PL) quenching, suggesting the multiple roles of the Ba doping. The synthesized novel photocatalyst displayed extremely high stability after 5 cycles as confirmed through various characterization techniques. The intermediates generated during the photocatalytic reaction were also detected through liquid chromatography–mass spectrometry (LC-MS) analysis and used to predict the degradation pathway of TC. Photoelectrochemical (PEC) measurements combined with photocatalytic performance obviously demonstrated that Ba doping effectively enhanced the separation of charge carriers and decreased the electron/hole recombination in the g-C<SUB>3</SUB>N<SUB>4</SUB> structure.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ba<B>-</B>doped g-C<SUB>3</SUB>N<SUB>4</SUB> was fabricated via a thermal condensation method. </LI> <LI> A lower recombination rate of photo-induced e<SUP>−</SUP> and h<SUP>+</SUP> pairs in Ba<B>-</B>doped g-C<SUB>3</SUB>N<SUB>4</SUB>. </LI> <LI> 91.94% of tetracycline (TC) was degraded within 120 min irradiation at an optimal pH of 10. </LI> <LI> Ba<B>-</B>doped g-C<SUB>3</SUB>N<SUB>4</SUB> retained high stability even after five cycles of use. </LI> <LI> h<SUP>+</SUP> is the predominant oxidative species for TC photodegradation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
정진석,Thi Kieu Oanh Nguyen,Thanh Truong Dang,Tahereh Mahvelati-Shamsabadi 한국화학공학회 2023 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.61 No.4
Graphitic carbon nitride (g-C3N4) has attracted considerable attention since its discovery for its catalysis of water splitting to hydrogen and oxygen under visible light irradiation. However, pristine g-C3N4 confers only low photocatalytic efficiency and requires surface cocatalysts to reach moderate activity due to a lack of accessible surface active sites. Inspired by the high specific surface area and superior electron transfer of graphene, we developed a strongly coupled binary structure of graphene and g-C3N4 aerogel with 3D porous skeleton. The as-prepared 3D structure photocatalysts achieve a high surface area that favors efficient photogenerated charge separation and transfer, enhances the light-harvesting efficiency, and significantly improves the photocatalytic hydrogen evolution rate as well. The photocatalyst performance is observed to be optimized at the ratio 3:7 (g-C3N4:GO), leading to photocatalytic H2 evolution of 16125.1 mmol. g-1. h-1 under visible light irradiation, more than 161 times higher than the rate achieved by bulk g-C3N4.