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您的检索式：作者名="Yuwaraj K.Kshetri"
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| 1 | Understanding the multifunctionality in Cu-doped BiVO_4 semiconductor photocatalyst显示文摘A visible light-induced, Cu-doped BiVO_4 photocatalyst was synthesized by a microwave hydrothermal method. The photocatalytic efficiency was investigated in the degradation of model water pollutants like Methylene Blue(dye) and ibuprofen(pharmaceuticals), as well as the inactivation of Escherichia coli(bacteria). The Cu-doped BiVO4 samples showed better efficiency than undoped BiVO_4, and the 1 wt.% Cu-doped BiVO_4 sample showed the best efficiency. The degradation of Methylene Blue reached 95%, while the degradation of ibuprofen reached 75%, and the inactivation of E. coli reached 85% in irradiation with visible light. The appearance of additional absorption band shoulders and widening of the optical absorption in the visible range makes the prepared powder an efficient visible light-driven photocatalyst. Moreover, the formation of an in-gap energy state just above the valance band as determined by density functional theory(DFT) first principle calculation, facilitates the wider optical absorption range of the doped system. Similarly, this in-gap energy state also acts as an electron trap, which is favorable for the efficient separation and photoexcited charge carriers' transfer process. The formation of oxygen vacancies due to doping also improved the separation of the charge carrier, which promoted the trapping of electrons and inhibited electron hole recombination, thus increasing the photocatalytic activity. No decrease in the efficiency of the 1 wt.% Cu-doped BiVO_4 photocatalyst in the degradation of ibuprofen over three consecutive cycles revealed the stability of the photocatalyst towards photocorrosion. These findings highlight the multifunctional applications of Cu-doped BiVO_4 in wastewater containing multiple pollutants. | Chhabilal Regmi Yuwaraj K.Kshetri Ramesh Prasad PANDey Tae-Ho Kim Gobinda Gyawali Soo Wohn Lee | 2019 | Journal of Environmental Sciences2019，31，1： | 12 |
| 2 | Spectroscopic properties of Er^(3+)/Ho^(3+)/Tm^(3+)dopedα-SiAlON ceramics under 793 nm excitation显示文摘This paper reports the first demonstration of super broadband infrared downshifting emission extending from1640 nm to 2200 nm with the full width at half maximum of~417 nm in lanthanides(Er^(3+),Ho^(3+),andTm^(3+))-dopedα-SiAlON ceramics upon 793 nm excitation.Usingα-Si;N;ceramic as a precursor the lanthanides-dopedα-SiAlON ceramics were synthesized by the hot-press method.The lanthanides induced no significant secondary phases in the sinteredα-SiAlON ceramics.Strong two-photon upconversion emission bands centered at 547,671 and 694 nm have also been observed upon 793 nm excitation.The time-resolved measurements of the upconversion emissions confirm that the efficient energy transfer among the Er^(3+),Ho^(3+)and Tm^(3+)ions as well as the ground state absorption in Er^(3+)and Tm^(3+)are responsible for the observed spectroscopic properties. | Bina Chaudhary Dhani Ram Dhakal Tae-Ho Kim Soo Wohn Lee Yuwaraj K.Kshetri | 2021 | Progress in Natural Science:Materials International2021，31，6： | 0 |
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