DYES AND PIGMENTS
·
2018
·
IF 3.767
Peng Li,Linna Guo,Zongxue Zhang,Tiesheng Li,Penglei Chen
A series of Bi 2 O 3 :Yb 3+ /Er 3+ phosphors with different phases and morphologies were obtained by tuning doping ions, which played a vital role in the upconversion luminescence (UCL). Both Er 3+ single doped and Yb 3+ /Er 3+ co-doped samples exhibit narrow, nearly pure red emission whether excited by 980 nm or 1550 nm. Compared to the sum of emission intensities excited by two single-wavelength (980 nm and 1550 nm) separately, the red emission from Bi 2 O 3 :Yb 3+ /Er 3+ with uneven distributed nanometer or micron blocky particles structure excited by two-wavelength simultaneously was enhanced by a factor of 2.41. To further improve the UCL intensity, optical-inert ions such as Na + , Ca 2+ and Gd 3+ were doped into this system. Compared to the optical-inert ions free sample (Bi 2 O 3 :15% Yb 3+ , 2% Er 3+ ), the pure red UCL in Bi 2 O 3 :15% Yb 3+ , 2% Er 3+ with 6% Na + , 2% Ca 2+ and 4% Gd 3+ doping is enhanced by 223.83 or 203.73 times under 980 or 1550 nm excitation, respectively. Meanwhile, the UCL mechanism under the multiwavelength was investigated in detail and its model of UC emission process was proposed.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Lianyun Cheng,Yanwei Li,Guang Sun,Jianliang Cao,Yan Wang
With the growing concern on environment protection, fast and selective detection of various harmful gases with the sensors based on metal oxide semiconductor (MOS) has stimulated increasing interest. However, the unsatisfied gas sensing performance of pure MOS hinders its practical application. In this paper, we propose a Bi 2 O 3 -ZnO heterojunction strategy to upgrade the performance of ZnO sensor to realize ultrafast detection of triethylamine (TEA) with high sensitivity and selectivity. To expound it, nanoscale Bi 2 O 3 -ZnO p-n heterojunctions were uniformly modified on the ZnO porous nanosheets-assembled architecture (PNSA) via an impregnation, freeze-drying and calcination method by using self-made Zn 5 (CO 3 ) 2 (OH) 6 as precursor. The obtained Bi 2 O 3 /ZnO PNSAs are about 7 µm in size, in which the thickness of porous nanosheets is around 25–38 nm. Impressively, compared with the sensor based on pure ZnO PNSA, the Bi 2 O 3 /ZnO PNSA sensor exhibited remarkably boosted triethylamine (TEA) sensitive performances, especially of faster response speed (<1 s for 100 ppm TEA), better selectivity (S TEA/toluene = 406.013) and higher sensitivity (26.886/ppm for 1–100 ppm TEA). The sensitization mechanisms of Bi 2 O 3 -ZnO heterojunction on ZnO PNSAs was discussed in detail.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nano Research
·
2022
·
IF 1.78
Shui Tuan Lin,Lian Wei Shan,Cheng Guo Ma,Ming Qi Yuan,Zi Lan Fang,Yan Wei Xiao,Li Min Dong,Dan Li,Ying Kui Guo
Heterojunction semiconductor photocatalysis is an auspicious technique for clear up organic pollutants from water, and have been of valuable strategy in the area of photocatalysis. Herein, electrophoretic deposition procedure was used to prepare α-Bi2O3/CdS type-Ⅱ heterojunction photocatalysts. The results of PL, Raman, and EIS show that there is a heterojunction effect in α-Bi2O3/CdS, which is propitious to improve the separation efficiency of photogenerated electron-hole pairs. The DFT calculation reveals that the work function of CdS (4.57 eV) is higher than that of α-Bi2O3 (3.37 eV), which facilitates the migrating of e- from the CB of α-Bi2O3 to the CB of CdS, and the migrating of h+ from the VB of CdS to the VB of α-Bi2O3, thus the e--h+ pairs with high redox ability are retained. The performances were assessed by degrading methyl orange (MO), acid magenta under simulated visible light irradiation. Under simulated visible light irradiation, BC45 composite exhibited the highest degradation efficiency of 87% (MO) and 81% (acid fuchsin) for 4 h, which was about 2 times higher than that of CdS (MO) and (acid fuchsin). It is believed that the dual characteristics of H2O wettability and dye adsorption performance in α-Bi2O3/CdS composites promote photocatalytic process compared with single CdS and α-Bi2O3. The study could provide new insights to develop efficiently capable photocatalysts of the α-Bi2O3/CdS composites.
研究领域:
材料科学
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环境科学
·
理论化学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Can Tao,Fang Zhao,Zi-Wei Tang,Luxi Zhang,Qiang Niu,Gao Cao,Li-Min Zhao,Wenhuan Huang,Ping Zhao
Magnetic mesoporous ZrO 2 (Fe 3 O 4 @ZrO 2 , MMZr) nanoparticles blocked by bismuth oxide (Bi 2 O 3 ) are presented and efficiently deliver chemotherapeutic agent daunomycin (DNM) to the targeted tumor cells. Bi 2 O 3 not only rapidly dissolves in the acidic condition of cancer cells to release the loaded chemotherapeutic drug but also enhances the anti-cancer effect through synergistic effects of the chemotherapy and Bi 3+ ions. By monitoring the treatment process, compared with the free drug DNM, the drug loaded DDS exhibit more significant suppression against cancerous cells growth such as A549 and MCF-7 cancer cells and lower cytotoxicity against normal Hacat cells. Mechanism research indicates that the drug loaded DDS can arrest the cell cycle at G0/G1 phase, change the mitochondrial membrane potential and finally induced the apoptosis of the cancerous cells. These results indicate that the Bi 2 O 3 -gated ZrO 2 platform is a promising approach to serve as a pH-sensitive DDS in the treatment of various cancers by chemo/ionic synergistic effects.
研究领域:
纳米技术
·
癌症治疗
·
药物递送系统
·
材料科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Shuai Yan,Sen Wang,Gaobin Liu,Qi Yuan,Kuoming Song,He Zhao,Xin Li,Rongzheng Shen
Herein, MgO–12 % TiO 2 (w) ceramics with different contents of Bi 2 O 3 –CuO sintering aid were prepared using a solid-state method. The effects of the sintering aid content on the sintering temperature and the dielectric and mechanical properties of the ceramics were studied. The material was characterized using scanning electron microscopy and X-ray diffraction and Precision LCR tester and universal testing machine and Archimedes drainage method. When the Bi 2 O 3 –CuO content was less than 9 wt%, the ceramic sample has higher dielectric properties. When the Bi 2 O 3 –CuO content was greater than 9 wt%, the dielectric properties will deteriorate. This is because Bi 2 O 3 participates in the chemical reaction between MgO and TiO 2 , forming a high dielectric loss Bi 4 Ti 3 O 7 phase. At high temperatures, Cu 2+ can easily change valence to Cu + , promoting oxygen vacancies and increasing dielectric loss in ceramic samples. The introduction of Bi 2 O 3 –CuO produces new MgTiO 3 , Mg 2 TiO 4 , and Bi 4 Ti 3 O 12 phases in the sample structure, resulting in a structure in which the MgO grains in the sample are surrounded by the new phases that appear around them. This structure fills the pores, increases density, enhances mechanical properties. The dielectric properties of the ceramics were the when the sintering temperature was 1050 °C, and the Bi 2 O 3 –CuO content was 3 wt%. The dielectric constant and dielectric loss were 11.19 and 1.17 × 10 −4 , respectively. The bending strength of the ceramic sample increased from 138.72 MPa to 179.64 MPa when the Bi 2 O 3 –CuO content was increased from 3 wt% to 15 wt%. The Bi 2 O 3 –CuO sintering aid enables MgO to be better applied in ceramic substrates.
研究领域:
材料科学
·
电子材料
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2024
·
IF 3.6
Binbin Chen,Lizhu Fan,Chunyu Li,Lu Xia,Kaiwen Wang,Jinshu Wang,Dawei Pang,Zhouhao Zhu,Peijie Ma
In this work, Au/Bi2O3 was synthesized by loading Au nanoparticles (NPs) onto β-Bi2O3 by a simple solution reduction method. β-Bi2O3 was synthesized by a precipitation-thermal decomposition procedure, which results in significantly improved SERS detection limits down to 10−9 M for methylene blue (MB) and 10−7 M for methyl orange (MO) as probe molecules, comparable to those reported for the best semiconductor SERS substrates. In particular, further deposition of Au NPs (5.20% wt%) onto β-Bi2O3 results in a two-order-of-magnitude enhancement in detection sensitivity, achieving a detection limit of 10−11 M for MB and 10−9 M for MO. Under ultraviolet/visible irradiation, the Au/Bi2O3 hybrids substrate exhibits superior self-cleaning ability due to its photocatalytic degradation ability which can be applied repeatedly to the detection of pollutants. The advanced composite substrate simultaneously achieved ultra-low mass loading of Au NPs, outstanding detection performance, good reproducibility, high stability and self-cleaning ability. The development strategy of low load noble metal coupled high performance semiconductor β-Bi2O3 to obtain nano-hybrid materials provides a method to balance SERS sensitivity, cost effectiveness and operational stability, and can be synthesized in large quantities, which is a key step towards commercialization and has good reliability prospects.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Chemistry
·
2018
·
IF 0
Ce Wang,Chao Tan,Weiqiang Lv,Gaolong Zhu,Zhaohuan Wei,Kelvin H.L. Zhang,Weidong He
In this work, we report the synthesis of a Bi 2 O 3 -TiO 2 hetero-junction (HJ) material through a facile colloidal method. The hetero-junction formation follows a growth with a 145°Bi 2 O 3 /TiO 2 crystal angle, owing to the large lattice mismatch between Bi 2 O 3 and TiO 2 crystals. With the Bi 2 O 3 -TiO 2 hetero-junction material as a photocatalyst , methyl orange is degraded completely within two hours under common UV-lamp irradiation. The photo-catalyst remains highly-active for complete photo-degradation of methyl orange even after multiple experiments. The remarkable photo-catalytic properties are attributed to the remarkable mono-dispersivity of the colloidal Bi 2 O 3 -TiO 2 nano-structure as well as the refined band structure with a valence band of 0.85 eV below that of TiO 2 crystal.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
JOURNAL OF SOLID STATE CHEMISTRY
·
2014
·
IF 2.2
Zhenlong Zhang,Jichun Zhu,Shengjun Li,Yanli Mao
SrTiO 3 /Bi 2 O 3 heterojunction semiconductor was prepared and characterized by X-ray diffraction, UV–vis absorption spectrum , and scanning electron microscope, surface photovoltage spectroscopy, and photoluminescence spectroscopy. The surface photovoltage spectra indicate that the separation efficiency of photoinduced charges for SrTiO 3 /Bi 2 O 3 was enhanced compared with that of SrTiO 3 or Bi 2 O 3 . The energy band diagram of SrTiO 3 /Bi 2 O 3 heterojunction was directly determined with X-ray photoelectron spectroscopy, and the conduction band offset between SrTiO 3 and Bi 2 O 3 was quantified to be 0.28±0.03 eV. The photoluminescence spectra display that the recombination rate of photoinduced carriers for SrTiO 3 /Bi 2 O 3 decreases compared with that of SrTiO 3 or Bi 2 O 3 , which is mainly due to the energy levels matching between them. Therefore the enhanced separation efficiency of photoinduced charges is resulting from the energy difference between the conduction band edges of SrTiO 3 and Bi 2 O 3 .
研究领域:
材料科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS
·
2021
·
IF 2.348
Wenna Hu,Fan Wu,Wei Liu
In this paper, nitrobenzene was found to be efficiently degraded by the as-prepared Z-scheme Bi 2 O 3 /Bi 2 WO 6 photocatalyst under visible light . The Bi 2 WO 6 and the composites were fabricated individually by solid phase synthesis and water-assisted grinding method. The crystal structure, morphologies, interface, optical property and Brunauer-Emmett-Teller (BET) surface area of samples were examined by different characterization techniques. The tests on photodegradation of nitrobenzene stated clearly the as-prepared composite exhibited evidently enhanced photocatalytic performace compared with uniphase material. Additionally, the optimal Bi 2 O 3 content in the coupled photocatalysts was 2%. The supreme rate constant of nitrobenzene degradation was almost 3.1 and 2.7 times that of single Bi 2 O 3 and Bi 2 WO 6 , respectively. The obviously increased photocatalytic performance of the composite was due to the highly effective separation of photoexcited electron-hole pairs over the Z-scheme structure formed between Bi 2 O 3 and Bi 2 WO 6 . The investigation provides great potential applications in treatment of the toxic and refractory wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 27
·21396-21408
·
IF 2.779
Wang Jiaxuan,Wu Daoxin,Wu Jialun,Duan Mengtian,Tong Haixia
A novel Bi 2 O 3 /Cs 3 PW 12 O 40 (Bi 2 O 3 /CsPW) composite was prepared by depositing Bi 2 O 3 on the surface of spherical Cs 3 PW 12 O 40 . The synthesized photocatalyst was characterized using XRD, XPS, FT-IR, BET, SEM, TEM, and UV–Vis. The results revealed that the composite was a typical Keggin-type photocatalyst. Compared with pure Bi 2 O 3 and CsPW, the composite exhibited high photocatalytic degradation activity for rhodamine B (RhB). The 10% Bi 2 O 3 /CsPW nanocomposite could decompose 92.7% of RhB under visible-light irradiation for 240 min. The improved photocatalytic degradation efficiency is mainly due to the enhanced absorption of visible-light and effective separation of photo-induced carriers caused by heterojunction formation. The active species capture tests confirmed that RhB photodegradation using Bi 2 O 3 /CsPW composite was mainly controlled by h + and·O 2− oxidation reactions. Furthermore, Bi 2 O 3 /CsPW composite displayed good stability under cyclic experiments.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 52
·79184-79198
·
IF 5.19
Zhao Yajuan,Dang Pu,Gao Yaqian,Li Yan,Xie Huidong,Yang Chang
Co 3 O 4 /Bi 4 O 7 /Bi 2 O 3 (CBB) composites were prepared, in which Co 3 O 4 was synthesized from Co-MOF as precursor. The peroxymonosulfate (PMS) activated by CBB catalyst under visible light was used to degrade tetracycline (TC). Owing to the synergistic effect of photocatalysis and PMS activation, 98.4% of TC was removed within 60 min. The optimal loading of Co 3 O 4 was determined, and the influence of PMS dosage, initial pH, and disturbing anions on the degradation effect were investigated. The “CBB + Vis + PMS” system showed good reusability, and the degradation was only reduced by 1.7% after 5 cycles. This system also had a good degradation of other five pollutants. The quenching experiment showed that holes (h + ), superoxide radicals (·O 2 − ), and singlet oxygen ( 1 O 2 ) were the main active species. The degradation products of TC were determined by liquid chromatography-mass spectrometry, and the degradation pathway was proposed. Finally, a double Z-scheme degradation mechanism was proposed in the “CBB + Vis + PMS” system. The peroxymonosulfate activated by CBB under visible light to degrade organic pollutants has widespread application prospects in environmental remediation. Graphical abstract
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2014
·Vol. 5
·期 5
·3767-3773
·
IF 3.708
Chade Lv,Gang Chen,Jingxue Sun,Chunshuang Yan,Hongjun Dong,Chunmei Li
In this work, we design and successfully fabricate novel Bi2O3 quantum dot (QD)-decorated BiVO4 nanofibers by a direct heat treatment of as-spun fibers. The Bi2O3 QDs with a size of 5–15 nm are well dispersed on the surface of the BiVO4 nanofibers with a diameter of 400–700 nm to form a Bi2O3 QD-decorated BiVO4 nanofiber photocatalyst. Based on the phase separation mechanism and the properties of solvents, a possible formation process of the Bi2O3 QD-decorated BiVO4 nanofibers has been proposed. The BiVO4 nanofibers decorated with Bi2O3 QDs exhibit much better photocatalytic performance than pure BiVO4 nanofibers. Photocurrent responses and electrochemical impedance spectra prove that decorating BiVO4 nanofibers with very small Bi2O3 QDs can effectively promote the separation of photoinduced carriers, which is beneficial for photocatalytic properties. More significantly, this work is relevant to environmental purification and photoelectrochemistry.
研究领域:
材料科学
·
环境科学
·
光电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）