Journal of Water Process Engineering
·
2025
·
IF 6.7
Huadong Liu,Jingliang Cheng,Xiaoyu Sun,Zhonghao Zhao,Cong Zhang
The widespread use of antibiotics like tetracycline (TC) poses a significant threat to water safety, and while photocatalysis offers a solution, the irrecoverability of powdered catalysts hinders its practical application. To overcome this, a novel packed-bed photocatalytic microreactor (GPR) was constructed by immobilizing a Eu 3+ /Bi 2 WO 6 composite onto glass beads via a sol-gel method. The reactors performance was rigorously evaluated through the continuous degradation of TC. Under optimized conditions (70 μL/min flow rate, 1 mg/L initial concentration), the GPR achieved a remarkable TC degradation efficiency of 98 %, with a high apparent pseudo-first-order rate constant of 0.305 min −1 . This performance represents a 5.2-fold enhancement over conventional slurry reactors. The system also demonstrated exceptional stability, maintaining over 96 % of its initial activity during 12h of continuous operation, and proved effective in complex environments by achieving 96.67 % removal in real wastewater. Computational fluid dynamics simulations corroborated these findings, revealing enhanced mass transfer and optimized flow dynamics within the microchannels. This study successfully demonstrates an efficient, stable, and easily retrievable photocatalytic system, providing a scalable strategy and valuable design principles for advancing continuous-flow water treatment technologies.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2018
·
IF 5.123
Wenying Li,Jiacheng Zhu,Guochong Xie,Yukun Ren,Yue-Qing Zheng
In this study, a system was established for the detection of tetracyclines (TCs) by simply mixing graphene quantum dots (GQDs) and Eu 3+ . The GQDs-Eu 3+ system exhibits both strong emission of GQDs and weak characteristic emission of Eu 3+ upon 360 nm excitation. In the presence of TCs, the luminescence of GQDs was quenched, while the luminescence of Eu 3+ was significantly enhanced. It is worth to mention that the GQDs we prepared possess a lot of carboxyl groups on the surface and edge. This carboxyl groups play an important role in fluorescent enhancement of Eu 3+ . On the basis of this effect, a novel label free ratiometric sensor was developed for the detection of TCs. Under the optimized conditions, linear concentration ranges from 0 to 20 μM for tetracycline was found, and the detection limits was 8.2 nM. This system also exhibited excellent selectivity toward TCs over other antibiotics. In addition, it was successfully applied to the determination of tetracycline in river water and milk samples. The proposed system was simple in design, fast in operation, rapid in response and cost-effective. In view of the advantages, the developed system demonstrates great potential for the detection of TCs in environmental and biological samples.
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PubMed
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2021
·
IF 3.995
Le Han,Jiaqiang Liu,Peng Liu,Bohan Li,Xianliang Li,Yan Xu
Ratiometric fluorescent sensing materials based on dual-emissive luminescent centers have been widely researched due to their highly stable self-calibrating monitoring performance. In this work, Eu 3+ , Tb 3+ co-doped gadolinium molybdate [Gd 2 (MoO 4 ) 3 ] phosphors were successfully prepared through a facile precipitation and a following heat treatment process. Dual-emissive Gd 2 (MoO 4 ) 3 : Eu 3+ , Tb 3+ phosphor showed characteristic emission peaks at 592, 617, and 703 nm corresponding to the transitions of 5 D 0 – 7 F 1 , 5 D 0 – 7 F 2 and 5 D 0 – 7 F 4 for Eu 3+ ions, and the other emissions at 488 and 543 nm were ascribed to 5 D 4 – 7 F 6 and 5 D 4 – 7 F 5 transitions for Tb 3+ , respectively. The temperature sensitivities of Gd 2 (MoO 4 ) 3 : Eu 3+ , Tb 3+ based on a multimode fluorescence intensity ratio (FIR) technique were investigated for monitoring temperature changes in the range of 80–450 K. The maximum relative sensitivities of the four modes of FIR (I Tb 3+ /I Eu 3+ ) techniques were successfully achieved with range of 0.37–0.50% K −1 . The results also demonstrated the high reversibility of Gd 2 (MoO 4 ) 3 : Eu 3+ , Tb 3+ phosphor used as a self-calibrating thermometer for thermal-sensing application.
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高影响因子
INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Jing Zhang,Gemei Cai,Wenjun Wang,Li Ma,Xiaojun Wang,Zhanpeng Jin
The local symmetry of a Eu3+ ion has a crucial effect on its luminescence properties. In this work, we show that the red/orange ratio in the emission of Eu3+-doped MgIn2P4O14 phosphors is tunable by adjusting the Eu3+ concentrations, due to the change in the local symmetry of metal ions. The substitution of Eu3+ for In3+ lowers the distortion in the lattice of monoclinic MgIn2P4O14, and an increase in Eu3+ doping concentration causes the metal ion sites to shift closer to an inverse center, leading to a reversal of the relative emission intensity of a magnetic dipole transition to an electric dipole transition. Meanwhile, the higher asymmetry of metal ion sites occupied by Eu3+ in MgIn2P4O14 makes the luminescence less thermally stable than that in Mg3In4P6O24.
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高影响因子
Chemosensors
·
2022
·Vol. 10
·期 12
·527
·
IF 4.229
Anheng Gu,Guo-Hui Pan,Huajun Wu,Liangliang Zhang,Ligong Zhang,Hao Wu,Jiahua Zhang
Orthorhombic ZrTiO4is an attractive dielectric material; its optical properties are, however, less known. In this paper, we reported on the microstructure and luminescence studies of pristine ZrTiO4and Eu3+-doped ZrTiO4phosphors. The results indicated that two types of TiO6octahedra, the isolated/ localized and coupled/delocalized, coexisted in host matrix. Eu3+doping could induce oxygen vacancy defect states located below the bottom of the conduction band. Pristine ZrTiO4showed bright yellow luminescence via STEs recombination at defects sites at low temperatures, but significant thermal quenching occurred due to STEs migration to quenching centers at elevated temperatures. Effective host sensitized energy transfer to Eu3+was observed in ZrTiO4:Eu3+phosphors and yielded the red characteristic emissions of Eu3+. Anomalous STEs luminescence enhancement and spectral blue-shift in the excitation spectra with higher Eu3 +concentration appeared and were explained by considering three factors: competitive absorption between electron transitions from the top of the valence band to the defect states and host conduction band, Eu3+doping driving the production of more isolated TiO6octahedra, and energy back-transfer from Eu3+activators to other titanate groups. On the basis of the dual-emitting combination strategy involving host STEs and Eu3+luminescence, ZrTiO4:Eu3+phosphors were demonstrated to be ratiometric self-referencing optical thermometric materials, with a working range of 153–313 K and a maxima of relative sensitivity to ~1.1% K−1at 243 K.
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高影响因子
Coatings
·
2022
·Vol. 12
·期 4
·512
·
IF 3.236
Song Wang,Yan Xu,Renjie Chen,Mengmeng Zhu,Muyi Wang,Mengmeng Cao,Yunpeng Liu,Haojie Ding,Shulan Zhang,Jueyao Bai,Jun Ren,Tongtong Xuan,Huili Li
All-inorganic halide perovskite nanomaterials have a high application potential in the field of display and lighting because of unique photoelectric properties. However, these materials suffer from problems related to poor water and thermal stabilities. In this study, green Eu3+-doped CsPbBr3/Cs4PbBr6perovskite composites that were synthesized by a saturated recrystallization method at room temperature showed an enhanced photoluminescence quantum yield of 87% and superior water and thermal stabilities to that of undoped perovskites. Finally, green Eu3+-doped CsPbBr3/Cs4PbBr6perovskite composites were fabricated into white light-emitting diodes (WLEDs) with a wide color gamut (124% of the National Television System Committee standard) and a high efficiency of 43.06 lm/W.
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高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 12
·3283
·
IF 5.076
Wenbin Yang,Siqi Niu,Yao Wang,Linjun Huang,Shichao Wang,Ketul C. Popat,Matt J. Kipper,Laurence A. Belfiore,Jianguo Tang
In this work, titania (TiO2) nanoparticles modified by Eu(TTA)3Phen complexes (ETP) were prepared by a simple solvothermal method developing a fluorescence Mn7+pollutant sensing system. The characterization results indicate that the ETP cause structural deformation and redshifts of the UV-visible light absorptions of host TiO2nanoparticles. The ETP also reduce the crystallinity and crystallite size of TiO2nanoparticles. Compared with TiO2nanoparticles modified with Eu3+(TiO2-Eu3+), TiO2nanoparticles modified with ETP (TiO2-ETP) exhibit significantly stronger photoluminescence under the excitation of 394 nm. Under UV excitation, TiO2-ETP nanoparticles showed blue and red emission corresponding to TiO2and Eu3+. In addition, as the concentration of ETP in TiO2nanoparticles increases, the PL intensity at 612 nm also increases. When ETP-modified TiO2nanoparticles are added to an aqueous solution containing Mn7+, the fluorescence intensity of both TiO2and ETP decreases. The evolution of the fluorescence intensity ratio (I1/I2) of TiO2and ETP is linearly related to the concentration of Mn7+. The sensitivity of fluorescence intensity to Mn7+concentration enables the design of dual fluorescence ratio solid particle sensors. The method proposed here is simple, accurate, efficient, and not affected by the environmental conditions.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Yuexin Wang,Yanhua Song,Xiuqing Zhou,Yi Li,Tingting Cui,Keyan Zheng,Ye Sheng,Haifeng Zou
A series of color-tunable emitting LuVO 4 :Tm 3+ ,Dy 3+ ,Eu 3+ microspheres were successfully synthesized by a solvothermal process. The structure was characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results revealed that the sample is pure tetragonal phase of LuVO 4 and consists of 3D-hierachical microspheres with the diameter about 2 μm. Additionally, the possible formation mechanism of microspheres was proposed. Furthermore, the photoluminescence properties of LuVO 4 :Dy 3+ ,Eu 3+ samples were investigated in detail. Both blue and yellow emissions corresponding to the 4 F 9/2 - 6 H 15/2 , 4 F 9/2 - 6 H 13/2 transition of Dy 3+ ions and red emission corresponding to the 5 D 0 - 7 F J (J = 1, 2, 3, 4) transition of Eu 3+ ions can be observed in LuVO 4 :Dy 3+ ,Eu 3+ phosphors under 366 nm near-ultraviolet radiation. The energy transfer process between Dy 3+ and Eu 3+ was demonstrated to be resonant type via dipole-quadrupole mechanism. Additionally, when co-doping Dy 3+ with Tm 3+ or Eu 3+ or tri-doping Tm 3+ ,Dy 3+ ,Eu 3+ ions in the single component, the colorful emitting can be obtained by giving abundant blue, green, red, yellow, orange, especially white-light-emission. This type of color-tunable luminescence phosphors may have promising application in solid state lighting application.
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高影响因子
JOURNAL OF RARE EARTHS
·
2020
·
IF 3.104
Jie Wang,Xiusha Peng,Danzhao Cheng,Zhigang Zheng,Hai Guo
Single-phase Y 2 BaAl 4 SiO 12 :Tb 3+ ,Eu 3+ phosphors with adjustable luminescence were successfully prepared by high-temperature solid-state reaction method. The structural, luminescent properties and energy transfer (ET) process of Y 2 BaAl 4 SiO 12 :Tb 3+ ,Eu 3+ phosphors were systematically analyzed with the help of X-ray diffraction (XRD), scanning electron microscopy (SEM), excitation spectra, emission spectra and photoluminescence decay curves. Tunable luminescence ranging from green through yellow and definitively to red can be achieved by elevating amounts of Eu 3+ ions in Tb 3+ ,Eu 3+ co-doped samples. Besides, the ET mechanism and efficiency were also analyzed and the maximum ET efficiency is 67%. All the results show that Y 2 BaAl 4 SiO 12 :Tb 3+ ,Eu 3+ phosphors can be used in solid-state lighting.
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高影响因子
JOURNAL OF RARE EARTHS
·
2011
·Vol. 29
·期 8
·732-736
·
IF 1.086
Caixia YU,Qu YANG,Lei SHA,Yingliang LIU
An efficient and convenient one-step process was developed for synthesizing new effective red luminous materials through ordered mesoporous γ-alumina assembling with Eu 3+ . Employing P123 as a structure-directing agent and hydrochloric acid, citric acid as pH adjustor, ordered mesoporous γ-alumina was fabricated by simple sol-gel method. The pore structure was characterized by X-ray diffraction (XRD), N 2 adsorption-desorption isotherms and transmission electron microscopy (TEM). The as-synthesized γ-aluminas had narrow pore-size distribution (5–7 nm), large surface area (246 m 2 /g) and high thermal stability (750–1000 °C). The luminous property of materials was characterized by Photoluminescence (PL) spectra. The γ-Al 2 O 3 :Eu 3+ materials had efficient luminescence, and the emission strength was related to the content of Eu 3+ .
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高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Feiyan Xie,Junqiang Gu,Shengqian Wang,Shengliang Zhong,Hualan Xu,Junhao Li
Phosphors for white light-emitting diodes (WLEDs) would suffer from inadequate luminescent thermal stability, especially at high temperatures, affecting both the reliability and lifespan of devices. Thus, the development of phosphors with excellent thermal stability is a crucial task. By use of a high-temperature solid-state reaction method, a series of Tb3+ and Eu3+ codoped NaGd2Ga3Ge2O12 (abbreviated as NGGGO) phosphors has been successfully synthesized. With an appropriate doping concentration of Tb3+ and Eu3+, the NGGGO:Tb3+,Eu3+ phosphors can provide color tunable emissions; simultaneously, the energy transfer (ET) efficiency from Tb3+ to Eu3+ can reach nearly 100%. Notably, high-concentration Tb3+ doping in NGGGO could induce oxygen vacancies, giving significant enhancement on the thermal stability of Eu3+ luminescence. For the NGGGO:60% Tb3+,1.6% Eu3+ phosphor, the emission intensity of Eu3+ at 450 K remained even higher than that observed under room-temperature conditions. By use of the as-synthesized phosphor as a red emission converter, a near-ultraviolet pumped WLED device can be fabricated. Under a driving current of 20 mA, the device exhibits high color rendering index (CRI) ∼ 89, low correlated color temperature (CCT) ∼ 4603 K, and bright white light with CIE chromaticity coordinates of (0.3569, 0.3587), which demonstrates the potential of NGGGO:Tb3+,Eu3+ phosphors in WLED application.
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PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2025
·
IF 3.5
Shuaiqi Zhao,Yujie Chen,Yumeng Ge,Hongbin Zhang,Kai Yang,Shiqing Xu,Xiaolei Yang,Gongxun Bai
Multicolor phosphors are crucial components in various applications such as screen displays, lighting fixtures, and color imaging technologies. Despite their widespread use, they still encounter some obstacles in multicolored luminescence. Here, we synthesized a series of Gd 2 ZnTiO 6 phosphors doped with Tb 3+ and Eu 3+ using a high-temperature solid-state reaction method. By employing Reisfeld's approximation theory and Dexter's multipolar interaction theory, we analyzed the energy transfer mechanism from Tb 3+ to Eu 3+ . Our findings indicate that the Tb 3+ to Eu 3+ energy transfer is facilitated by quadrupole-quadrupole interactions. Additionally, we assessed the thermal stability of Gd 2 ZnTiO 6 :Tb 3+ , Eu 3+ using temperature-variable emission spectroscopy across a temperature range of 303–463 K. The Gd 2 ZnTiO 6 phosphors exhibited polychromatic luminescence ranging from green (0.3632, 0.61033) to red (0.6521, 0.3481) under 381 nm excitation by adjusting the content of Eu 3+ and Tb 3+ . Consequently, the Gd 2 ZnTiO 6 :Tb 3+ , Eu 3+ phosphors exhibit excellent luminescence performance coupled with remarkable thermal stability, offering a valuable reference for the advancement of novel and robust luminescent materials.
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高影响因子
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