Journal of Environmental Chemical Engineering
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2020
·
IF 4.3
Tao Huang,Jundong Zhu,Shengzhuo Ge,Tianyu Guo,Chongwen Jiang,Le Xie
Heterogeneous photo-Fenton reaction using BiFeO 3 as catalyst was considered as an efficient environmental remediation technique. However, its low catalytic performance limited its application. In this work, CdSe QDs with high electron mobility, small size effect and rich surface properties were loaded on BFO surface by stirring impregnation method. The photo-Fenton catalytic performance of catalysts under visible light irradiation was evaluated by the degradation of phenol. The results showed that the BFO with CdSe QDs uniformly distributed on the surface shows much better photo-Fenton degradation of phenol performance than that of pure BFO. Moreover, when the load content of CdSe QDs comes to 0.5 wt%, the degradation efficiency of phenol increased from 41.5% to 98.5% within 60 min. The results of photochemical experiments confirmed that composite catalyst had a good ability to separate photo-induced carriers and the experiments of free radicals trapping showed that the holes and OH radicals were important active substances. Based on the above research, the possible mechanism of photo-Fenton reaction of catalyst was expounded. Excellent photo-Fenton catalytic performance and superior stability make this material showing a good application prospect for the degradation of organic pollutants in wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Scientific Reports
·
2019
·Vol. 9
·期 1
·1-8
·
IF 4.011
Xu Haowen,Zhang Heyi,Ma Yuhui,Jiang Mao,Zhang Yewei,Wu Yinan,Zhang Haoran,Xia Ruidong,Niu Qiaoli,Li Xing’ao,Huang Wei
The morphology of perovskite light-absorption layer plays an important role in the performance of perovskite solar cells (PSCs). In this work, BiFeO 3 (BFO) nanostructures were used as additive for CH 3 NH 3 PbI 3 (MAPbI 3 ) via anti-solvent method. The addition of BFO nanostructures greatly enhanced the crystallinity, grain size and film uniformity of MAPbI 3 . As a result, the charge carrier mobility and electron diffusion length increased, leading to the increase of the short circuit current (J SC ) of PSCs. This work provides a very simple but effective approach to improve the morphology of perovskite layer for efficient PSCs.
研究领域:
材料科学
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能源科学
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产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
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2024
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IF 3.8
Tao Xian,Xuelian Ma,Xiaofeng Sun,Chenyang Sun,Huaqing Wang,Lijing Di,Ke Ma,Hua Yang
In this work, a promising p-n type AgCl/BiFeO 3 heterojunction piezo-photocatalysts was constructed by attaching AgCl nanocubes on the surface of BiFeO 3 microdiscs. The characteristic results verified that the intimate heterojunction between AgCl and BiFeO 3 was formed. Under the simulated sunlight excitation, the photocatalytic degradation activity of dye (Acid Orange 7 (AO7) and Rhodamine B (RhB)) over BiFeO 3 can be obviously improved after the decoration of AgCl, and the 10%AgCl/BiFeO 3 sample exhibits optimum photocatalytic removal performance, which leads to ∼99.7% and ∼93.8% of AO7 and RhB degraded after 120 min irradiation. Most importantly, the piezo-photocatalytic degradation ability of 10%AgCl/BiFeO 3 sample was evaluated by the removal of tetracycline (TC) excited by simulated sunlight and ultrasonic irradiation. It is found that the 10%AgCl/BiFeO 3 sample presents more efficient piezo-photocatalytic activity compared with its piezocatalytic and photocatalytic performance, leading to a synergistic factor SF = ∼1.6, which demonstrates an outstanding synergistic improvement between photocatalysis and piezocatalysis. Furthermore, the piezo-photocatalytic degradation pathway of TC was proposed by the intermediates detection and theoretical calculation. The piezopotential of BiFeO 3 microdiscs excited by ultrasonic was simulated. The interface electric field induced by p-n heterojunction and piezoelectric polarization field caused by the ultrasonic irradiation separately promote the surface and bulk migration of generated charges, which synergistically accelerates the separation of generated charges and thus providing more charges for the catalytic reaction. This work has developed a potential efficient heterojunction-type piezo-photocatalysts for environmental purification.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CRYSTENGCOMM
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2025
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IF 2.6
Jiangwen Bai,Jiamin Li,Jinmeng Xiang,Chongfeng Guo
The built-in electric field (IEF) between two components of heterojunction has been proven to be capable of efficiently separating photogenerated carriers in photocatalysis. However, the rapid charge accumulation near the interface of heterojunction tends to neutralize this electric field, resulting in the deterioration of the heterojunction performance. Herein, the ferroelectric-based BiFeO3/BiOI-n heterojunctions (BFO/BiOI-n) were prepared utilizing epitaxy growth. The BFO not only endows the heterojunctions with stronger ferroelectric polarization, which was confirmed by the hysteresis loop, but also induces a significant redistribution of carriers, which maintains a stronger IEF in BFO/BiOI-n. Furthermore, the ferroelectric polarization of BFO was further regulated via corona poling and the enlarged ferroelectric polarization was also favorable to improve the photocatalytic performance. The optimal PBFO/BiOI-4 sample delivers a complete degradation of RhB within 30 minutes and a hydrogen evolution rate of 150 µmol·g−1·h−1. The significantly improved photocatalytic performance is attributed to the efficient photogenerated carriers separation synergistically promoted by the IEF in the heterojunction and the polarized electric field (PEF) in BFO. This work provides a feasible scheme for designing ferroelectric-based heterojunction photocatalyst.
研究领域:
材料科学
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光催化
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2021
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IF 5.302
Jie Wu,Gaochao Zhao,Chengbing Pan,Peng Tong,Jie Yang,Xuebin Zhu,Lihua Yin,Wenhai Song,Yuping Sun
We report the structure, dielectric, ferroelectric and piezoelectric properties of Cr-Mn co-doped (1- y )BiFe 1- x Cr x O 3 - y BaTi 1- x Mn x O 3 (0≤ x ≤0.04, 0.2≤ y ≤0.27) ceramics. By varying both x and y , a series of samples near morphotropic phase boundaries exhibiting both high ferroelectric Curie temperature T C (∼580−643 °C) and relatively large piezoelectric constant d 33 are constructed. Especially, the sample with y = 0.24 and x = 0.02 is found to show coexistence of high depolarization temperature T d (∼551 °C) and relatively large d 33 ∼116 pC/N, superior to most of those of BiFeO 3 based high-temperature piezoceramics reported previously. The enhanced ferroelectric T C in the Cr-Mn modified samples can be ascribed to the combined effects of large lattice distortion and high tetragonal phase content. These results demonstrate that constructing morphotropic phase boundaries via considering simultaneously the role of lattice distortion might be effective route to realize high-temperature and high piezoelectricity in BiFeO 3 -based systems.
研究领域:
材料科学
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电陶瓷
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铁电材料
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压电材料
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产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
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2024
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IF 5.2
Yanting Zuo,Shi Cheng,Ziwen Guo,Haolin Liu,Huaicheng Zhang,Ji Wu,Ziwu Fan,Wentao Li,Aimin Li
Sulfamethoxazole (SMZ) is a prevalent and recalcitrant micropollutant in water, posing a significant threat to both aquatic organisms and human health. Therefore, investigating the removal of SMZ is of critical importance. In order to investigate the effect of rare earth metal doping on the performance of activated persulfate oxidative degradation of SMZ, BiFeO 3 with different Ce doping amounts was successfully prepared by a hydrothermal method. Then, it was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM) and Brunauer–Emmett–Teller (BET) method. The performance of porous Ce/BiFeO 3 in the catalytic activation of persulfate (PMS) for the degradation of SMZ in water was investigated using SMZ solution as a simulated wastewater. The impact of Ce doping rate, catalyst dosage, temperature variations, common anions, natural organic matter, and PMS concentration on SMZ removal was systematically evaluated. The characterization results show that the octahedral rhombic structure of Ce can be observed on the surface of this doped catalyst, and Ce doping does not change the crystalline shape of Ce/BiFeO 3 . The specific surface area of the doped catalyst increases, accompanied by an enlargement of pore size, thereby enhancing the catalyst's adsorption capacity and resistance to contamination by SMZ. Under the optimal conditions of 25 °C, SMZ concentration of 20 mg/L, 0.8 g/L PMS and 0.3 g/L 0.05Ce/BiFeO 3 catalyst, the removal rate of SMZ reaches approximately 95% within 35 min of reaction time. Even after five cycles of reuse, the degradation rate of SMZ remains above 88%, demonstrating the catalyst's good stability and reusability. Bursting experiments show that SO 4 ·– , ·OH, 1 O 2 and O 2 ·– are involved in the catalytic degradation process, with 1 O 2 playing a dominant role.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 19
·24496-24506
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IF 2.478
Cheng Shuai,Zhang Bo-Ping,Wang Li-Jun,Yang Tao,Yuan Chang-Lai,Zhou Chang-Rong,Rao Guang-Hui,Yin Yang
The enhanced piezoelectric and ferroelectric properties of the tetragonal 0.67BiFeO 3 –0.33BaTiO 3 (BF–33BT) ceramics without MnO 2 doping or other dopants via tailoring sintering temperature ( T S ) and dwell time ( t d ) are reported. All ceramics crystallized in a single tetragonal phase, independent of the adopted T S and t d . As the T S or t d is increased, the BF–33BT ceramics show an increase in grain size and in relative density, while T S > 980 °C or t d > 6 h would result in more oxygen vacancies caused by Bi 3+ evaporation and/or reduction of Fe 3+ to Fe 2+ , along with a reduced relative density and an increased current leakage density. Because of the increased grain size, the higher relative density, and relatively less oxygen vacancies, high d 33 = 151 pC/N and P r = 25.9 μC/cm 2 were achieved in tetragonal BF–33BT ceramics with T S = 980 °C and t d = 6 h. In addition, large unipolar strain of 0.146% and \(d_{33}^{*}\) =326 pm/V (40 kV/cm), as well as high T C = 427 °C were also obtained in the BF–33BT ceramics with T S = 980 °C and t d = 6 h. Our studies indicate that the grain size, the relative density, and the oxygen vacancies play important roles for the piezoelectric properties of BF–33BT ceramics.
研究领域:
材料科学
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物理学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 12
·9595-9604
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IF 2.22
Zhou Junyi,Zhang Huimin,Chang Aimin,Zhao Yifeng
La x Bi 1− x FeO 3 (LBFO) materials were synthesized by sol–gel method with x = 0.0, 0.1, 0.2, and 0.3. LBFO ceramics were obtained by rapid liquid phase sintering and conventional sintering, respectively. X-ray diffraction (XRD) and Raman spectroscopy indicated that the phase transition from twisted diamond R3C to orthogonal Pbnm occurs in the course of the increase of La element doping. Scanning electron microscopy demonstrated that the grain size of LBFO ceramics decreased from 10 to 1 μm, with the increase of La ion doping, and the volatilization of Bi decreases from 6.48 to 1.43%. It was found that LBFO ceramics have the characteristic of negative temperature coefficient (NTC), the resistivity (100 °C) is from 4.32 × 10 6 to 2.71 × 10 8 Ω cm, the material constant ( B 100/700 value) is about 6000–9000 K, the activation energy of LBFO is around 0.56 to 0.82 eV, and the temperature range of LBFO is from 100 to 700 °C. The resistivity change of LBFO is less than 1% after 500 h of ageing at 300 °C.
研究领域:
材料科学
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物理学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Jiajia Long,Tingting Ren,Jun Han,Najun Li,Dongyun Chen,Qingfeng Xu,Hua Li,Jianmei Lu
Piezocatalysis converting mechanical energy into chemical energy is deemed as an emerging technology for degradation of organic pollutants in water or air. In this work, BiFeO 3 @CdS nanofibers with heterostructure and enhanced piezoelectric response were prepared for efficient piezocatalytic degradation of organics in water. The optimal BiFeO 3 @CdS-10% achieved nearly complete removal of bisphenol A (BPA) within 60 min with the degradation rate constant of 0.098 min −1 , which was 9.4 and 4.9 times higher than that of pristine BiFeO 3 and CdS, respectively. The excellent piezocatalytic activity of the composite can be attributed to the construction of heterojunction and the enhanced piezoelectric response from the synergistic effect of the two piezoelectric components, which can accelerate the internal transfer of free carriers. It gives an insight into the feasible construction of efficient piezocatalysts and opens up a new way for BiFeO 3 -based piezoelectric materials to be utilized in purification of wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Materials Today Chemistry
·
2021
·
IF 8.301
C. Ji,T. Fan,G. Chen,X. Bai,J. Wang,J. He,W. Cai,R. Gao,X. Deng,Z. Wang,X. Lei,C. Fu
The (1- x )BiFeO 3 - x BaTiO 3 (short for (1- x )BFO- x BTO, x = 0.2–0.4) ceramics were prepared by solid-state reaction with microwave sintering (MWS) and conventional sintering (CS) methods. The crystal structure, microstructures, dielectric properties , ferroelectric properties , and magnetic properties of BFO-BTO ceramics sintered by MWS and CS were systematically investigated. It is found that the MWS can effectively decrease the grain size and enhance the compactness of BFO-BTO ceramics. The X-ray diffraction (XRD) results confirm that all ceramics exhibit a single perovskite structure, and the phase transforms from rhombohedral in BiFeO 3 -rich compositions to pseudo-cubic phase gradually as x increases. Introducing BTO into BFO can strengthen its dielectric relaxation behavior. Compared with CS, the MWS samples have a lower remanent polarization ( P r ) and a smaller coercive field ( E c ) under the same electric field. Therefore, MWS contributes to the decrease of dielectric loss. Addition of BTO can contribute to the reduction of the coercive force ( H c ) of BFO-based ceramic, and so decrease the hysteresis loss. At the same time, its remanent magnetization ( M r ) value can be decreased by introducing BTO into BFO and using MWS method. The present research provides a route for decreasing the dielectric loss and hysteresis loss of BiFeO 3 -based ceramics using the MWS method.
研究领域:
材料科学
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物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2016
·Vol. 80
·期 3
·675-682
·
IF 1.473
Wang Ting,Song S.-H.,Xu Ting,Wang Meng
Multiferroic BiFeO 3 nanopowders are synthesized through a sol–gel route using the environment-friendly and non-toxic maltose as the complexing and reducing agent. A high content of hydroxyl groups is found to be critical in the preparation of phase-pure BiFeO 3 materials. Fourier transform infrared spectroscopy, thermogravimetric analysis and differential scanning calorimetry reveal that the optimal calcination temperature of BiFeO 3 precursor is about 450 °C in the synthesis, leading to the formation of phase-pure and well-crystallized BiFeO 3 nanopowders with sizes being about 40 nm. Magnetic measurements illustrate the ferromagnetic behavior of BiFeO 3 nanopowders at room temperature. The maximum and remanent magnetizations of the nanopowders are about 0.657 and 0.048 emu/g, respectively, under the magnetic field of 50 kOe. Moreover, the energy band gap of the nanopowders is approximately 2.27 eV, confirming their strong absorbance of the visible light. Graphical
研究领域:
材料科学
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纳米科技
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凝聚态物理
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功能材料
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无机化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2024
·Vol. 35
·期 6
·1-12
·
IF 2.8
Tang Lanxin,Li Shuangchi,Wang Fang,Chen Yu
The binary perovskite-type compound (1 − x )BiFeO 3 – x BaTiO 3 (BF-BT) is considered as a promising high-temperature lead-free piezoelectric material due to its high Curie temperature ( T C > 400 °C) and better electromechanical properties. In this work, ternary lead-free piezoelectric ceramics with a chemical formula of (0.67 − x )BiFeO3–0.33BaTiO3– x Bi(Zn0.5Ti0.5)O 3 + 1 mol% MnO 2 (where x = 0–0.05) were prepared by the conventional solid-state reaction route. The effects of Bi(Zn 0.5 Ti 0.5 )O 3 introduction on the phase structures and microstructures, piezoelectric and dielectric properties, as well as impedance characteristics of BF-BT ceramics were investigated in detail. Firstly, all the samples synthesized exhibit a pure perovskite structure with the coexistence of rhombohedral ( R ) and tetragonal ( T ) phases, and the T phase content increases with increase in x . A small amount of Bi(Zn 0.5 Ti 0.5 )O 3 ( x ≤ 0.03) that were incorporated into the perovskite lattice of BF-BT can promote the grain growth of ceramics. Secondly, all samples were found with a notable relaxed phase transition behavior, T C of the system decreases with increase in x . The AC impedance spectra of the samples were fitted and analyzed according to the R-CPE equivalent circuit model, the electric impedance of the ceramics at high temperatures was mainly contributed by grain boundaries. Moreover, the dielectric relaxation activation energy of the samples firstly decreases and then increases with increase in x . Finally, the composition with x = 0.02 shows the optimized electrical properties among these samples, including T C = 454 °C, d 33 = 117 pC/N, k p = 23%, tan δ = 0.11, which are mainly benefited from the bismuth content compensation and the substitution of (Zn 0.5 Ti 0.5 ) 3+ for Fe 3+ at B-site reducing the valence change of Fe 3+ in BF-BT.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
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