MATERIALS SCIENCE FORUM
·
2016
·
IF 0
Shu Yu Zhong,Hai Shao Ye,Ji Qi Jiang,Qian Yang,Pei Song Tang
Using La (NO3)3·6H2O, NH4VO3, citric acid as the main raw materials, nanocrystalline LaVO4 sample was prepared by microwave method. The structure and morphology of sample were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-visible diffuse reflectance spectroscopy (DRS) and Fourier Transform Infrared (FT-IR) spectroscopy. The photocatalytic activity of LaVO4 was studied for methyl orange (MO) used as simulated sewage. The XRD and SEM showed that the particle size of LaVO4 was about 80-100 nm. The DRS showed that LaVO4 had optical absorption onset of 356 nm, indicating the optical band gap of 3.48 eV. The FT-IR showed that LaVO4 had vibration peaks of Fe-O and V-O bond. Under UV-light, the photocatalytic experiment indicated that the prepared LaVO4 nanocrystalline had highly photocatalytic activity for degradation of methyl orange.
研究领域:
材料科学
·
环境科学
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DOI
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 21
·9748-9755
·
IF 2.7
Linjie Yan,Fan Zhang,Fan Liu,Xiaoyi Lei,Xuecheng Liu,Xia Jin,Xiaole Zhu,Tingting Pei,Hongyu Chen
It is essential to design and fabricate semiconductor-based photocatalysts with excellent activity to split H2O into H2 and O2 using sunlight because of the depletion of fossil resources and environmental pollution. LaVO4 is a visible light catalyst with a narrow band gap, satisfactory stability, and a low price. Therefore, in this work, alkali metal-doped LaVO4 was manufactured. Alkali metal-modified LaVO4 was prepared by a hydrothermal method as a photocatalyst for water splitting under visible light illumination, and a series of characterizations was carried out. The results showed that alkali metal doping improved the catalytic performance of pure LaVO4 and mainly optimized the hydrogen and oxygen production of Na-doped LaVO4 so that a maximum H2 and O2 evolution of 2.83 and 0.71 μmol g−1 h−1, respectively was obtained. The superior photocatalytic activity of Na-doped LaVO4 was mainly attributed to synergistic effects, including the extended visible-light response and improved charge separation. This study provides a new idea for the design of a highly efficient LaVO4-based water-cracking photocatalyst.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
高影响因子
Science Bulletin
·
2016
·
IF 0
Xiaoping Liu,Hao Qin,Weiliu Fan
Band offset is a dominant factor affecting the photocatalytic performance of heterostructure photocatalysts . Therefore, controlling the band gap structure of semiconductors is a key challenge in the development of efficient photocatalysts. We used a typical in situ-method to prepare diverse graphite-phase carbon nitride (g-C 3 N 4 ) samples from melamine , thiourea , and a mixture thereof, and found that they exhibited band gaps between 2.3–2.8 eV. From UV–Vis spectra and X-ray photoelectron spectroscopy measurements, we determined that the g-C 3 N 4 samples exhibited different band gap values and valence band positions. On this basis, we constructed g-C 3 N 4 /m-LaVO 4 heterojunctions with different band offsets. UV–Vis spectra and X-ray photoelectron spectroscopy measurements revealed that the valence band offsets (VBOs) of the different heterojunctions were similar, but their conduction band offsets (CBOs) were significantly different. Photocatalytic experiments revealed that the reaction rate was enhanced with an increase in the CBO value. Furthermore, the three-phase g-C 3 N 4 /g-C 3 N 4 /m-LaVO4 heterojunction composed of m-LaVO4 and mixed g-C 3 N 4 showed the highest photocatalytic activity , which was mainly due to the construction of a multilevel structure. This work investigates the influence of the band offset on heterojunction photoelectrochemical properties and provides a new strategy to improve the photocatalytic activity by constructing multilevel structures.
研究领域:
材料科学
·
光催化
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产品关联
DOI
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Yan Shen,Tianjing Zhang,Haoran Zhao,Yu Xiao,Jie Hong,Mohamed Abbas,Wanliang Yang
Portable and reusable solid-state fluorescence sensors have received much attention in the field of metal ion detection as a superior alternative to traditional liquid-based fluorescence sensors. In this study, a novel HHSS@LaVO 4 :Eu 3+ /polyacrylamide/sodium alginate (HLE/PS) hydrogel was successfully constructed for portable dynamic fluorescence switching detection of Fe 3+ and encryption of security information. The HLE/PS hydrogel was synthesized from HHSS@LaVO 4 :Eu 3+ fluorescent nanofillers embedded in a semi-IPN network of polyacrylamide (PAM) and sodium alginate (SA). The HLE/PS hydrogel has demonstrated excellent performance in the detection of Fe 3+ in aqueous solutions with high selectivity, high sensitivity, fast response (8 min), wide detection range (2–1000 μM), low detection limit (0.78 μM) and ease of use. It can be reused up to five times, underlining its utility and economy as a good performance fluorescence sensor. Notably, the quenching of Fe 3+ fluorescence by ultrasmall LaVO 4 :Eu 3+ nanoparticles on HHSS supports was significantly enhanced compared to conventional large-sized rare earth phosphor fillers. Additionally, by exploiting the reversible fluorescence switching function of the HLE/PS hydrogel, we further developed a high-security multi-layer information encryption platform. Finally, we thoroughly investigated the fluorescence response mechanism of HLE/PS hydrogels to Fe 3+ ions. This work not only provides a representative case for the preparation of packed rare-earth fluorescent hydrogels, but also demonstrates their potential as multifunctional smart luminescent materials.
研究领域:
材料科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 16
·5014-5025
·
IF 6.1
Xinyue Geng,Gaoqing Hang,Alberto J. Fernández-Carrión,Xing Ming,Sihao Deng,Lunhua He,Xiaojun Kuang,Xiaoyan Yang
Solid-state oxide ion and proton conductors are garnering significant attention due to their high ionic conductivity and potential applications in a range of electrochemical devices, including solid oxide fuel cells and gas sensors. In this study, we report the influence of partial substitution of La3+ in isolated tetrahedral LaVO4 ceramics with 0.01 mol of alkaline-earth metals Ca2+, Sr2+ and Ba2+ on the phase stability and electrical properties. It was found that acceptor doping effectively enhances mixed oxide ion and proton conductivities, with Sr2+ substitution yielding the highest conductivity, achieving ∼10−3 S cm−1 at 900 °C under a wet O2 atmosphere. DFT calculations and ab initio molecular dynamics simulations revealed that protons preferentially form hydrogen bonds with the lattice oxygen near the dopants and migrate through a continuous process of hopping and rotation between inter- and intra-tetrahedral VO4 groups. Additionally, the existence of oxygen vacancies facilitates the formation of V2O7 dimers through sharing corners with adjacent isolated VO4 tetrahedra, enabling ion exchange through a synergistic mechanism involving V2O7 dimer breaking and reforming. This research highlights the critical role of the deformation and rotational flexibility of isolated tetrahedral units in facilitating oxide ion and proton transport, underscoring the potential for developing mixed oxide ion and proton conductors in oxygen vacancy-deficient oxides with tetrahedral-based structures.
研究领域:
材料科学
·
计算化学
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DOI
高影响因子
Nano Energy
·
2021
·
IF 17.881
Xue Li,Jundie Hu,Tingyu Yang,Xiaogang Yang,Jiafu Qu,Chang Ming Li
Effectively utilize photogenerated holes (h + ) of catalysts while blocking rapid recombination of photoinduced carriers are the two critical challenges for solar-to-hydrogen (STH) conversion. Here, an exquisite 2D/2D LaVO 4 /g-C 3 N 4 (LaVO 4 /CN) heterostructure is delicately designed and fabricated for efficient photocatalytic H 2 -evolution while producing high value-added furfural simultaneously. The abundant biomass furfuryl alcohol (FFA) is employed to substitute the traditional h + sacrificial agents such as triethanolamine (TEOA) for the oxidation half reaction, which is very meaningful to balance the H 2 -evolution half reaction. The LaVO 4 /CN heterojunction enables 3-time increased H 2 -evolution and a high furfural-production rate (0.95 mmol g −1 h −1 ) than that of pristine graphite carbon nitride (g-C 3 N 4 , labeled as CN), and with a 22.16% H 2 -evolution apparent quantum efficiency (AQE) irradiated at 400 nm. This work provides an exquisite catalyst and a new strategy for efficient photocatalytic H 2 -evolution coupled with production of high valuable chemicals.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
高影响因子
MRS Communications
·
2024
·
IF 1.8
Wang Jun,Pan Xuexue,Li Zhirui,Xu Runkai,Zhang Peifeng,Lin Zhirui,Fan Yuliang,Xie Jinjie,Ke Jingping,Supiyeva Zhazira
In the presence of ethylenediaminetetraacetic acid (EDTA), a straightforward hydrothermal method was conceptualized for the purpose of controlling the size and form of the zircon-type tetragonal phase of LaVO 4 :Eu nanostructures. Nanorods and nanosheaves have been selectively obtained by tuning the pH value. In particular, LaVO 4 :Eu nanorods covered by EDTA molecules are soluble in water. In addition, research on photoluminescence has demonstrated that Eu 3+ -doped LaVO 4 nanorods exhibit significant red emission when exposed to ultraviolet light. This phenomenon has the potential to be utilized in a variety of disciplines, including visual display, catalysis, and biological imaging. Graphical abstract
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2015
·
IF 1.981
Xuerui Cheng,Dongjie Guo,Shiquan Feng,Kun Yang,Yongqiang Wang,Yufen Ren,Yang Song
Pure monazite ( m )- and zircon ( t )-type LaVO 4 and LaVO 4 :Eu 3+ were successfully synthesized by a hydrothermal method . The high pressure behavior of m - and t -LaVO 4 nanoparticles has been investigated using Raman scattering techniques at room temperature. Raman measurements reveal a slight change for m -LaVO 4 at 11.2 GPa because of an isostructural phase transition. However, striking changes in Raman spectra indicate a pressure-induced irreversible phase transition from the zircon to monazite structure for t -LaVO 4 at around 5.9 GPa. The evolution of the luminescence spectra of t -LaVO 4 :Eu 3+ has also been studied during the pressure-induced phase transition. It is observed that pressure has a great influence on the fluorescence intensity and the energy levels, which allows a more in-depth understanding of the nature of the pressure-induced phase transition for t -LaVO 4 . This result further confirms the conclusion that zircon-type RVO 4 compounds with larger rare-earth cations will experience zircon to monazite phase transition.
研究领域:
材料科学
·
高压物理
·
固态化学
·
光谱学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 39
·18615-18622
·
IF 3.591
Xuecheng Liu,Ling Gao,Gaoxiang Qi,Jie Zhang,Biyan Liu,Yucheng Chen
A heterojunction structure LaVO4/g-C3N4 composite with oxygen defects was successfully prepared. The characterization results show that the recombination of electron–hole pairs could be inhibited by the heterojunction structure. The LaVO4/g-C3N4 composite shows superior photocatalytic water splitting performance for the generation of hydrogen and oxygen under visible light irradiation. Experimental data show that under visible light irradiation, the hydrogen and oxygen evolution rates of the LVOCN1 composite are much higher than those of fresh carbon nitride. Moreover, the photocatalytic activity of LaVO4/g-C3N4 composites could be significantly enhanced by O defects. Mechanism studies display that the possible mechanism of the photocatalytic water splitting reaction is the Z scheme mechanism.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2012
·Vol. 14
·期 14
·4786-4793
·
IF 3.842
Qianming Wang,Zhengyang Zhang,Yuhui Zheng,Weisheng Cai,Yifei Yu
A systematic study of the preparation of lanthanide (Eu3+, Tb3+, Sm3+ and Dy3+) phosphors was carried out and luminescent materials (red, green, orange-red and blue-yellow) were successfully achieved at low temperature (70 °C) in 45 min, using simultaneous supersonic and microwave irradiation. Scanning and transmission electron microscopic images indicate that one-dimensional nanorods with diameters of 10–20 nm and lengths of up to 200 nm were formed. The phosphors were entrapped in cellulose gels and the corresponding hydrogels were also strongly emissive.
研究领域:
材料科学
·
纳米技术
·
发光材料
·
凝胶化学
✓ 已验证
DOI
高影响因子
Journal of Magnesium and Alloys
·
2024
·
IF 15.8
Meihong Wu,Mingxia Gao,Shanqing Qu,Yongfeng Liu,Wenping Sun,Xin Zhang,Chu Liang,Xiaoyu Zhang,Yaxiong Yang,Hongge Pan
MgH 2 is a promising solid–state hydrogen storage material. However, its high thermodynamics and sluggish kinetics hinder its practical application. Catalytic strategy is effective in improving its kinetic performance. Nevertheless, the highly efficient catalysts or additives are normally of low-yield in fabrication with high cost. In this work, a novel structural LaVO 4 fabricated by a low-cost method of spraying dry followed by a calcination is used as a catalytic additive for the hydrogen storage of MgH 2 . With an optimized addition of LaVO 4 , the overall hydrogen storage performances of MgH 2 are significantly improved. An onset dehydrogenation temperature of only 183°C is obtained after an initial activation of dehydrogenation and hydrogenation. The system can desorb 5.7 wt% H 2 at 250°C within 10 min and maintains a dehydrogenation capacity of 5.0 wt% H 2 after 50 cycles. It is found that LaVO 4 is transferred to lanthanum hydride and metallic vanadium in the initial dehydrogenation process, the former acts as a highly effective catalyst for the hydrogen storage of MgH 2 and the latter undergoes reversible hydrogenation and dehydrogenation in the subsequent cycles. The structural design of the catalyst and its scalable fabrication are highly valuable in realizing the practical application of catalytic strategy for the hydrogen storage of MgH 2 .
研究领域:
材料科学
·
催化化学
·
能源存储
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 7.7
Renze Zhang,Hanyang Ji,Zhiqiang Yang,Huai Wang,Fangling Zhou,Guanchao Li,Zhijia Liao,Mengran Ran,Hongmin Zhu,Tianyao Qi,Zhenyu Yuan,Yanbai Shen,Fanli Meng
Triethylamine (TEA), a hazardous industrial volatile organic compound, requires sensors with rapid response and ppb-level sensitivity. This study synthesized m-LaVO 4 nanospheres with controlled exposed crystal facets via a hydrothermal method. The optimized material, featuring a layered morphology and dominant (200) plane, showed a high response of 27.2 to 100 ppm TEA at 225°C with a 5 s response time, shortening to 2 s at 15 ppm. The sensor demonstrated a low detection limit of 1 ppb, excellent selectivity, repeatability, long-term stability, and light-modulated sensing behavior. These properties are attributed to the unique layered structure and surface characteristics of m-LaVO 4 , making it a promising candidate for efficient, low-concentration TEA detection.
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DOI
高影响因子
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