CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Jiajia Long,Yuting Qian,Wenrou Tian,Najun Li,Dongyun Chen,Qingfeng Xu,Hua Li,Jianmei Lu
The insufficient active sites, low separation efficiency of free carriers and poor capacity to generate active free radicals are limitations of asymmetrical BiFeO 3 in piezocatalysis. To address these issues, BiFeO 3 hollow nanospheres with exposed abundant catalytic active sites were fabricated via a solvothermal method for the first time. In addition, surface iodine-grafting was introduced, resulting in a local electric field and the conduction band potential of BiFeO 3 closer to the O 2 /·O 2 – redox potential (-0.33 eV). It facilitated charge transmission and active species generation to remove bisphenol A under ultrasonic vibration. Thus, the iodine-grafted BiFeO 3 hollow nanospheres could completely degrade 20 mL bisphenol A (10 ppm) within 60 min with a relatively fast rate constant of 0.153 min −1 , which was 4.5 times higher than that of un-grafted BiFeO 3 . This work provides a feasible approach to construct efficient piezocatalysts for industrial wastewater purification.
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 Water Process Engineering
·
2023
·
IF 7
Yuying Hu,Xin Wang,Xiaohuan Zheng,Kangqi Jiang,Hao Deng,Xiaoming Peng,Hongling Dai,Yang Wei,Fengping Hu
Natural organic matter (NOM) widely exists in natural water bodies and threat drinking water safety. This study aims to construct an integrated photocatalytic/coagulation system and explore its treatment efficiency for NOM in source water. Morphological characteristics of the floc complex were studied based on the machine vision detection system. In addition, structural change characteristics of the floc complex in the integrated photocatalytic/coagulation system were revealed from microscopic perspective to clarify the mechanism of its effect in source water treatment process. And recycling and recycling method of photocatalyst was optimized. The results showed that the integrated photocatalytic/coagulation system can effectively reduce generation of DBPs at concentration level of μg·L −1 , and the formed petal-like BiFeO 3 -core floc complex can achieve rapid sedimentation and had excellent recycling performance. The construction of integrated photocatalytic/coagulation system in this study is expected to provide a theoretical basis for achieving low consumption and high efficiency improvement of source water quality.
研究领域:
环境科学
·
水处理工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2025
·
IF 16
Minghai Yao,Bo Li,Hanxiao Gao,Gengguang Luo,Lulu Liu,Hangyao Wu,Ze Yuan,Jiahong Li,Shenglin Jiang,Guangzu Zhang,Haibo Zhang,Yang Liu
Piezoelectric actuators, enabling the conversion of electrical energy into mechanical strain, are pivotal in various electromechanical applications. The morphotropic phase boundary (MPB) approach has been widely used to enhance the electrostrain performance of piezoelectrics. It remains to be explored alternative frameworks beyond the conventional MPB method. Here, a high-entropy strategy is used to enhance the electromechanical response of ferroelectric materials with pristine composition near MPB. By incorporating chemical disorders through the high-entropy strategy, atomic disordered arrangements and severe lattice distortions are induced in the BiFeO3–BaTiO3 (BF-BT) system, thus promoting the formation of nanopolar regions and nanodomain structures, facilitating a more flattened energy profile and mutual phase transformation under an electric field and improving the electromechanical response activity of lattices. As a result, high-entropy BF-BT-based polycrystalline ceramics exhibit an ultrahigh electromechanical response with a giant unipolar electrostrain of 1.23% at 80 kV cm–1 with fatigue-free resistance to cyclic electric fields. The effective converse piezoelectric coefficient (d33*) reaches 1537 pm V–1, surpassing most lead-free piezoelectrics. Our work highlights the potential of high-entropy design in ferroelectric materials as high-performance piezoelectric actuators.
研究领域:
材料科学
·
铁电材料
·
压电材料
·
陶瓷工程
·
功能材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 56
·48427-48439
·
IF 4.6
Shuai Fu,Yun Wen,Qiang Huang,Yonglong Song,Qi Liu,Huijie Zhu,Yanhong Wang,Tingting Feng,Shichao Liu,Zhiqun Ma
The Z-scheme AgBr/BiFeO3 heterojunction was successfully constructed via a combined hydrothermal and in situ precipitation strategy. The optimized heterojunction exhibited remarkable photocatalytic activity, achieving 95.72% degradation of Lanasol Red 5B within 60 min under visible-light irradiation, which represented a 5.66-fold enhancement over pristine BiFeO3. Comprehensive characterization revealed that the Z-scheme heterostructure effectively facilitated charge carrier separation and modified electron transfer pathways. The experimental factor towards degradation efficiency of Lanasol Red was investigated. Furthermore, the AgBr/BiFeO3 heterojunction demonstrated versatile degradation capability toward various organic dyes including Lanasol Red 5B, rhodamine B, methyl orange, methyl red, and methylene blue. Trapping experiments combined with ESR analysis verified that holes (h+) and superoxide radicals (˙O2−) played critical roles in the photocatalytic process, which formed the basis for postulating a Z-scheme charge transfer mechanism. This work provided a feasible synthesis strategy for developing high-performance BiFeO3-based photocatalytic systems for environmental remediation applications.
研究领域:
材料科学
·
环境修复
·
光催化
·
纳米材料
·
异质结工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2026
·Vol. 31
·期 17
·2987
·
IF 5.1
Huan Deng,Qingsong Xie,Shengnan Li,Hai Lu,Hongyan Wei,Tiehong Song
In this work, a BiFeO3/MoS2(BM) material was utilized to establish a piezophotocatalytic system under combined visible-light (Vis) illumination and mechanical stirring (MS), which synergistically activated peroxymonosulfate (PMS) toward the oxidation of 4-chlorophenol (4-CP), a representative refractory organic pollutant in water. Under mechanical stirring, the piezoelectric effect in BM generates a polarized electric field that promotes the separation of photogenerated electron–hole pairs, thereby providing more charge carriers for PMS activation and subsequent radical generation. The degradation performance, underlying mechanism, toxicity of degradation products, reusability, and applicability in different water matrices in the BM(1:3)/PMS process were comprehensively evaluated. The results indicated that BM(1:3) exhibited superior performance over other BM ratios (BM(2:1), BM(1:1), and BM(1:2)), achieving 91.6% removal of 4-CP within 30 min at a rotation speed = 1000 rpm, PMS = 2.0 mM, BM(1:3) = 0.5 mg/L, and initial 4-CP = 10 mg/L. Furthermore, water quality parameters exerted notable impacts on 4-CP decomposition. A pH of 4.7 was favorable, and the presence of Cl−enhanced the 4-CP degradation, while HCO3−and H2PO4−suppressed the removal efficiency; SO42−and HA showed negligible influence. DFT calculations identified the reactive sites on 4-CP that are prone to attack by various reactive oxygen species (e.g., •O2−,1O2, •OH, and SO4•−), resulting in the transformation of 4-CP through three degradation pathways into smaller organic intermediates, most of which were less toxic than 4-CP. The BM(1:3) catalyst exhibited satisfactory reusability; however, a significant decrease in 4-CP degradation efficiency was observed in the lake water matrix. Overall, the synergy between photocatalysis and the piezoelectric effect in the BM(1:3)/PMS system offers a useful research foundation for the piezophotocatalytic degradation of persistent organic pollutants such as 4-CP.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Feng Luo,Denghui Jiang,Yinghao Zhu,Yumei Tan,Hongyu Yang,Zhimin Li
The high strain hysteresis has impeded lead-free piezoelectric ceramics to replace lead zirconate titanate ceramics applied in actuators. In this study, we report a significant advancement with the synthesis of a novel BiFeO 3 -BaTiO 3 -(Ba 0.6 Sr 0.4 )TiO 3 (BF-BT-BST) system. The optimal composition has demonstrated a remarkable strain of 0.42 % coupled with a notably low hysteresis of 21 %. It is found that the incorporation of BST into BF-BT facilitates the transition from the rhombohedral phase to the pseudo-cubic phase, which in turn significantly enhances the relaxor ferroelectric characteristics of the ceramic. Through adjusting the composition proportion of BST, a unique ferroelectric domain structure is established for the BF-BT-0.04BST ceramic, where polar nanoregions (PNRs) are surrounded by ferroelectric macrodomains. The domain structure enables the ceramic to have the ability to respond the external electric field quickly compared to the PNRs for typical relaxor composition, thereby leading to large strain and low hysteresis simultaneously. Hence, it is inferred that the ferroelectric macrodomains simplify the response process of the PNRs under electric field. This study provides an efficient strategy to break through the bottleneck of large strain hysteresis for BF-BT ceramic, and gives a deep comprehension for the improvement of the strain characteristics.
研究领域:
材料科学
·
固体力学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·
IF 13.325
Cai Wei,Liu Kaihua,Gao Rongli,Deng Xiaoling,Chen Gang,Fu Chunlin
Bismuth ferrite (BiFeO 3 , short for BFO) is an important room-temperature single phase multiferroic materials. To further improve electric properties of BFO, La 3+ was introduced. Bi 1− x La
x
FeO 3 ( x = 0–0.12) thin films were fabricated by sol-gel method. The microstructure, optical and electric properties of Bi 1− x La
x
FeO 3 thin films have been investigated. XRD results show that Bi 1− x La
x
FeO 3 thin films is rhombohedral distortion perovskite structure and the addition of La 3+ can inhibit the formation of impure phase. The substitution of La 3+ for Bi 3+ on A sites can restrain the growth of grain and improve the roughness of thin films. The band gap of Bi 1− x La
x
FeO 3 thin films is less than that of BFO thin films, and its band gap decreases first and then increases as the content of La 3+ increases, which results from both Burstein-Moss effect and impurity level. A larger amount of La 3+ ( x = 0.12) can make leakage current of BFO thin films obviously decrease. Moreover, the remnant polarization and coercive electric field of Bi 1− x La
x
FeO 3 thin films increase with the increasing of La 3+ content. It results from the decrease of oxygen vacancy and effects of grain size. Keywords Bismuth ferrite Lanthanum Optical Dielectric Ferroelectric
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 9
·1-6
·
IF 1.784
Li Xiaoyi,Tang Zhixian,Ma Haidong,Wu Fan,Jian Ronghua
One-dimensional, single-crystalline bismuth ferrite (BiFeO 3 ) nanorods were successfully prepared by polyvinylpyrrolidone-assisted hydrothermal process. The crystal structure and morphology of the as-prepared BiFeO 3 sample were characterized by X-ray diffraction (XRD), field emission scanning electron microscope and transmission electron microscopy. The XRD analysis reveals that single-phase BiFeO 3 sample was obtained. Morphology observation shows that the as-formed BiFeO 3 nanoparticles are the shape of nanorods. The band gap of the as-prepared BiFeO 3 nanorods was identified by ultraviolet–visible diffuse reflectance spectrum. Meanwhile, the photocatalytic properties of the as-prepared BiFeO 3 nanorods were evaluated by degrading Rhodamine B. The result revealed that the as-prepared BiFeO 3 nanorods exhibit photocatalytic activity under visible light irradiation ( λ ≥ 400 nm).
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Mengyun Ouyang,Xiaoming Li,Qiuxiang Xu,Ziletao Tao,Fubing Yao,Xiaoding Huang,You Wu,Dongbo Wang,Qi Yang,Zhuo Chen,Zhoujie Pi
Persulfate (PS) activation have been extensively considered as a promising technology for removing recalcitrant pollutants, due to their production of radicals with superior oxidation reactivity. However, a catalyst with high reactive and convenient recovery for PS activation still remains to be developed. In this work, the silver-doped bismuth ferrite (Ag x -BiFeO 3 , x = 0.1, 0.2, 0.3 and 0.4) catalysts with variable Ag content were synthesized via a facile sol-gel method and applied as heterogeneous catalyst in PS activation for tetracycline (TC) degradation. Ag 0.4 -BiFeO 3 presented the best catalytic activity compared with other Ag doped BiFeO 3 composites, 91% TC could be efficiently removed within 60 min under optimized conditions and the reaction rate constant was 0.0338 min −1 . On the basis of the characterization analysis and catalytic test results, Ag could be the effective active site in PS activation and had a significant effect on PS activation. Moreover, the initial pH has negligible effect on the catalytic performance, indicating that Ag 0.4 -BiFeO 3 /PS system could work in a wide pH range. The results of electron spin-resonance spectroscopy and radical quenching tests suggested that both SO 4 − and OH radicals were involved in the Ag 0.4 -BiFeO 3 /PS system. The possible mechanism of Ag 0.4 -BiFeO 3 activating PS and the major degradation pathway of TC degradation were proposed. At last, the reusability experiment results proved that Ag 0.4 -BiFeO 3 catalyst still has a high catalytic performance after 4 times used.
研究领域:
环境科学
·
化学工程
·
催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Micro & Nano Letters
·
2019
·Vol. 14
·期 13
·1307-1311
·
IF 0.975
Jin Li,Xiao Ying Guan
The effect of Ce doping on the structural and optical properties of BiFeO 3 nanoparticles via sol–gel method is reported. All samples were a pure phase with perovskite structure. The EDX results show the doped samples contain Bi, Fe, O and Ce elements. The vibrational properties of samples were studied using Raman spectroscopy. Photoluminescence shows an intense peak at 398 nm, the peak strength enhanced greatly and had redshift with the increase of Ce doping concentration. UV–vis results show the samples have a broad absorption band in the range of 500–600 nm. The bandgaps decrease with the concentration increase of Ce doping. It indicates the as-prepared BiFeO 3 can be used as visible light catalyst.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 105
·期 3
·2020-2028
·
IF 3.784
Yuanyuan Wang,Hongbo Liu,Tingnan Yan,Jianwei Zhao,Shifeng Guo,Rong Sun,Zhilun Lu,Dawei Wang
In this work, Nb-doped 0.75SrTiO 3 -0.25BiFeO 3 (ST-BF) lead-free ceramics are designed and synthesized using a conventional solid-state reaction method. The influence of Nb doping on the microstructure, dielectric, and electrical properties are systematically investigated. With the increase of Nb concentration, the crystal structure of ST-BF remains pseudo-cubic as exhibited in the X-ray diffraction patterns. The grain size is found to increase from 0.33 to 6.23 μm, and then decrease to 1.88 μm by Nb doping, along with a clear heterogeneous core–shell microstructure. A relatively low dielectric loss (∼0.1, at 1 kHz) and a stable dielectric constant (∼700, at 1 kHz) are obtained for the 0.03 Nb-doped ST-BF composition at room temperature. Impedance spectroscopy analysis shows that Nb doping in ST-BF increases the total resistivity, forming an electrically conductive core and a nonconductive shell, with enhanced activation energy. The results may provide a feasible approach to develop novel ST-based lead-free dielectric ceramics for capacitor applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Guoqiang Xi,Jiaqi Ding,Ruiqi Guo,Jianjun Tian,Linxing Zhang
Ferroelectric photovoltaic (FE-PV) materials have generated widespread attention due to their unique switchable photovoltaic behavior, but suffering from low photocurrent and remanent polarization. Herein, enhanced ferroelectric polarization and switchable photovoltaic in BiFeO 3 based thin films were achieved by the optimization of Bi content. The compact and uniform films with few defects were obtained by the control of chemical composition. The remanent polarization increased from 3.4 to 73.9 μC cm −2 showing a qualitative leap. Intriguingly, the control range of photovoltaic signal between two polarization directions of the short-circuit current density ( J SC ) and open circuit ( V OC ) in present films exhibited an increase of 99.2% and 278.9%, respectively. It is suggested that the ferroelectric polarization was the main driving force for enhancing switchable ferroelectric photovoltaic. Therefore, the present work outstands a simple idea to enhance switchable ferroelectric photovoltaic based on the chemical engineering, providing a promising pathway for the development of photovoltaic devices.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）