JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2021
·
IF 3.995
Zhiyu Liu,Jianhe Tang,Congcong Piao,Xing Zhang,Xiaochen Qi,Ying Tian,Dawei Fang,Jun Wang
A novel Z-scheme CaF 2 :Yb 3+ ,Er 3+ @ZnTiO 3 /Au/CdS photocatalyst has been prepared. In this system, an excellent up-conversion luminescent agent, CaF 2 :Yb 3+ ,Er 3+ , is introduced to broaden the light response range. The Au surface plasmon resonance effect endows the system with highly efficient charge transfer. The photocatalytic activity of the Z-scheme CaF 2 :Yb 3+ ,Er 3+ @ZnTiO 3 /Au/CdS photocatalyst has been evaluated in the degradation of norfloxacin (NOR) with simultaneous hydrogen production . Some influencing factors, such as solar light irradiation time, sacrificial agent concentration, and number of reuse cycles, are discussed. The emission spectrum and energy conversion mechanism of CaF 2 :Yb 3+ ,Er 3+ have also been studied. The prepared photocatalyst facilitated a significant degree of degradation (92.05%) of NOR and considerable hydrogen production (513.39 μmol/g) under solar light irradiation for 5.0 h. Moreover, it showed high stability in photocatalytic NOR degradation with simultaneous hydrogen production over five cycles. A possible mechanism for photocatalytic degradation of NOR with simultaneous hydrogen production promoted by the Z-scheme CaF 2 :Yb 3+ ,Er 3+ @ZnTiO 3 /Au/CdS photocatalyst is proposed.
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产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Yitong Lin,Taiyu Jin,Yu Liu,Jianhe Tang,Ying Tian,Xueke Liu,Liang Chen,Dawei Fang,Jun Wang
A coated Z-scheme NaGdF 4 :Nd 3+ ,Yb 3+ ,Tm 3+ @CdS-Pd@NiO photocatalyst with core-shell structure is prepared by hydrothermal and coprecipitation methods. NaGdF 4 :Nd 3+ ,Yb 3+ ,Tm 3+ as excellent up-conversion luminescent material can convert infrared light into visible light, broadening the light response range of CdS. Pd nanorods act as conductive channels and co-catalysts, leading to successful construction of titled photocatalyst, increasing contact area between two monomer photocatalysts, promoting transfer of photo-generated electrons. It also provides a large oxidation surface for organic pollutant degradation. The performance of prepared photocatalyst is assessed by Congo red degradation and hydrogen production . The emission spectrum and energy conversion mechanism of NaGdF 4 :Nd 3+ ,Yb 3+ ,Tm 3+ are investigated. The photocatalyst with 3:1 NaGdF 4 :Nd 3+ ,Yb 3+ ,Tm 3+ @CdS-Pd and NiO mass ratio has a preeminent activity. Congo red degradation ratio and hydrogen production amount reach 92.48% and 653.06 µmol/g, respectively, under simulated sunlight irradiation for 180 min. The possible mechanism of organic pollutant degradation with synchronous hydrogen production caused by titled photocatalyst is proposed.
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DOI
高影响因子
ANALYST
·
2013
·Vol. 138
·期 8
·2392-2397
·
IF 3.969
Hong-Qi Chen,Fei Yuan,Shao-Zhen Wang,Juan Xu,Yi-Yan Zhang,Lun Wang
A new luminescence resonant energy transfer (LRET) system has been designed that utilizes near-infrared (NIR)-to-NIR upconversion lanthanide nanophosphors (UCNPs) as the donor, and Au nanorods (Au NRs) as the acceptor. The UCNPs were excited by a near-infrared (980 nm) wavelength and also emitted at a near-infrared wavelength (804 nm) using an inexpensive infrared continuous wave laser diode. The Au NRs showed a high absorption band around 806 nm, which provided large spectral overlap between the donor and the acceptor. Hg2+ ions were added to an aqueous solution containing the UCNPs and Au NRs that were modified with a Hg2+ aptamer. Then, a sandwich-type LRET system was developed for the detection of Hg2+ ions that had high sensitivity and selectivity in the NIR region. The method was successfully applied to the sensing of Hg2+ ions in water and human serum samples.
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DOI
PubMed
高影响因子
Chemical Engineering Journal Advances
·
2022
·
IF 0
Hongqiang Cui,Yongze Cao,Lei Li,Guojian Li,Yuhang Zhang,Sai Xu,Yichao Wang,Xiangping Li,Baojiu Chen
A serious of Er 3+ /Yb 3+ co-doped Cs 2 Bi 2 Sr(P 2 O 7 )(PO 4 ) 2 (CBSPO) phosphors are prepared by solid phase reaction method, and the related thermal enhancement of up-conversion luminescence (UCL) are studied in depth under 980 and 1550 nm laser excitations. When doping concentration of Er 3+ is fixed at 0.1, and doping concentration of Yb 3+ is adjusted to improve the thermal enhancement effect in the temperature range from 303 to 723 K. The optimal doping concentrations of Er 3+ /Yb 3+ are found as 0.1 and 0.5, and the maximum enhancement of green UCL emission reaches 5.25 and 16.74 times under 980 and 1550 nm laser excitations, respectively. This is because of the combined action of electronic thermal agitation, phonon assisted transition and lattice distortion of doping Er 3+ sites. The change of structure with temperature is studied by variable temperature XRD. Additionally, based on FIR technique, the absolute sensitivity of 0.00955 K −1 at 557 K, 0.00643 K −1 at 509 K are got in CBSPO:0.1Er 3+ /0.3Yb 3+ under 980 nm laser excitation and in CBSPO:0.1Er 3+ /0.4Yb 3+ under 1550 nm laser excitation, respectively. The structure changes of polyphosphate with temperature provide new ideas for development of thermally enhanced up-conversion phosphors, which can be applied as optical thermometer at high temperature environment.
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DOI
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