COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Qiuling Chen,Tian Gao,Ying Ren,Changjiang Xiao
The demand for high-performance electromagnetic wave absorbent materials continues to grow with advancing technology. This study reports the synthesis of Bi 2 Fe 4 O 9 /Fe 3 O 4 nanoflower to enhance electromagnetic wave absorption. Bi 2 Fe 4 O 9 , synthesized via a hydrothermal method, was composited with different content Fe 3 O 4 nanocrystals. The strong binding between sheets of nanoflowers provides large surface area and active sites for electromagnetic wave absorption (EMA). The combination of Bi 2 Fe 4 O 9 and Fe 3 O 4 markedly enhanced the dielectric and magnetic properties, resulting in exceptional EMA performance. The sample achieved a minimum reflection loss (RL min ) of −75 dB at 7.0 GHz with a thickness of just 2.5 mm, along with a maximum effective absorption bandwidth (EABW) of 9.2 GHz. The broadband and strong absorption on electromagnetic wave is attributed to the synergistic effects of ferroelectric properties from Bi 2 Fe 4 O 9 and spinel structure of Fe 3 O 4 , supported by strong dipole coupling, interfacial polarization, and high-spin states of Fe ions. The underlying mechanism is thoroughly discussed, and the results demonstrate superior performance compared to similar studies in the field.
研究领域:
材料科学
·
电磁学
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产品关联
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2022
·Vol. 36
·期 5
·e6619
·
IF 4.072
Mingliang Ma,Yan Chen,Yanyan Liu,Jiabin Jiang,Zhengguo Jiao,Yong Ma
Wastewater treatment has become a research hot issue in recent decade. Organic dyes as one of the main pollutants can change the water behavior. To deracinate the organic pollutants from wastewater, there are numerous methods have been taken into consideration. Photocatalysis is the promising strategy for the dye degradation with low cost, high efficiency, and environmental friendliness. Hence, a novel one-dimensional (1D) magnetic Bi 2 Fe 4 O 9 /C@AgBr composite photocatalyst was prepared employing electrospinning, calcination, and deposition–precipitation methods. The morphology and composition of photocatalyst were characterized, as well as the photocatalytic activities of degrading methylene blue (MB) under visible light were investigated. And the results exhibited that the efficiency of Bi 2 Fe 4 O 9 /C@AgBr under visible light for 60 min is 97.4%. After three cycles, the degradation efficiency of MB could still reach 88.0%. Moreover, radical quenching experiment implicated superoxide radical anions as the primary active species responsible for photodegradation of MB. This work provides a new insight into the design of effective photocatalysts for practical application.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Chuanjian Su,Chaolin Li,Ruhong Li,Wenhui Wang
Piezocatalytic molecular oxygen activation has been regarded as a promising and low energy-cost strategy for environment remediation, yet the piezocatalytic activity is still far from satisfactory and little is known on its activation mechanism, which greatly hinders its further development. Herein, the piezocatalyst Bi 2 Fe 4 O 9 nanosheets (BFO NSs) are synthesized via a facile hydrothermal method, which exhibit excellent piezocatalytic performance for sulfamethoxazole degradation. O 2 ∙ - generated via the molecular oxygen reduction reaction by piezo-electrons and the piezo-holes were confirmed as major active species for organic pollutants degradation. Further theoretical calculations and XPS analyses confirm the Fe 2+ sites as active centers activate molecular oxygen into O 2 ∙ - via donating the electrons to molecular oxygen and the piezo-electrons reduce Fe 3+ to Fe 2+ . This work provides atomic-scale insights into the active sites of piezocatalytic molecular oxygen activation, which can inspire the development of more efficient piezocatalysts for environment application.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Ying Lin,Jingjing Dai,Haibo Yang,Lei Wang,Fen Wang
Using Bi 2 Fe 4 O 9 microplatelets as precursors, we developed a facile etching strategy for three-dimensional porous Bi 2 Fe 4 O 9 microspheres with reduced graphene oxide (rGO) multilayered sheets for high-performance electromagnetic (EM) absorbing material. In a solution of N,N dimenthyl formamide (DMF), hydrazine and methyl mercaptoacetate, the precursors synchronously were subjected to a dissolution-recrystallization/reduction process to obtain a hybrid of numerous Bi 2 Fe 4 O 9 fragments and graphene to form the rGO/porous Bi 2 Fe 4 O 9 composite. The porous Bi 2 Fe 4 O 9 microspheres with an mean diameter of 500 nm were uniformly assembled on the graphene multilayered sheets without obvious aggregation. Such three-dimensional structure rGO/porous Bi 2 Fe 4 O 9 composite not only utilize efficiently the high conductivity and specific surface area of graphene, but only the hierarchical architectures of porous Bi 2 Fe 4 O 9 microspheres. The results show that the rGO/porous Bi 2 Fe 4 O 9 composite exhibits a maximum reflection coefficient of −71.88 dB at 13.8 GHz with a sample thickness of only 2.0 mm and an effective absorption bandwidth (reflection loss below −10 dB) of 4.24 GHz, greatly superior to the present graphene-based metallic oxide composite. The strategy paves an efficient way for designing new candidate for lightweight electromagnetic wave (EMW) absorbing materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
IEEE SENSORS JOURNAL
·
2024
·
IF 4.3
Yu Wan,Qingsong Luo,Zhenxing Wang,Shuang Gao,Yuting Wang,Changhao Feng
The present study focuses on the synthesis of BiFeO
3
/Bi
2
Fe
4
O
9
composite nanofibers via electrospinning, which exhibit enhanced gas sensing properties towards n-butanol. Notably, the sensors based on 11.3-BFO nanofibers demonstrate a remarkable response of 40.8 to 100 ppm n-butanol, representing an approximately 3.4-fold improvement compared to pure BiFeO
3
nanofibers. Additionally, the 11.3-BFO gas sensor exhibits a rapid response time (18 s) and recovery time (37 s) when operated at a temperature of 150°C. It also exhibits excellent selectivity, good repeatability, and long-term stability. The improved gas sensing performance can be attributed to the formation of heterojunctions and a more textured surface, thereby indicating the potential application of BiFeO
3
/Bi
2
Fe
4
O
9
composite nanofibers as a gas sensor for n-butanol detection. This study further validates the efficacy of constructing heterojunctions in improving the gas-sensitive properties of metal-oxide semiconductor, thereby providing valuable insights for synthesizing and investigating heterojunctions.
研究领域:
材料科学
·
传感器技术
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Chuangjian Su,Ruhong Li,Chaolin Li,Wenhui Wang
The application of promising persulfate-based advanced oxidation processes (AOPs) for environment remediation is limited by the poor charge separation and the sluggish kinetic for active centers regeneration of the catalysts. Piezocatalytic activation has been proposed to solve the above concern recently, but little is known on its mechanism. Herein, novel piezocatalyst Bi 2 Fe 4 O 9 nanosheets (BFO NSs) are demonstrated to significantly improve peroxydisulfate (PDS) activation efficiency via piezocatalysis, resulting SO 4 •− and •OH as the dominant active species for organic pollutants degradation. Further DFT calculations and experimental investigations confirm that the Fe 2+ in BFO NSs as active sites donate electrons for PDS to generate SO 4 •− , and simultaneously that the piezo-electrons can accelerate the regeneration of Fe 2+ , thus leading to the superior catalytic activity. This work provides atomic-scale insights of catalytic sites and mechanisms of piezocatalytic PDS activation and may inspire the development of more efficient piezocatalysts and AOPs.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Changming Zhang,Rongxian Wang,Xiaochao Zhang,Zhiyan Dong,Wensheng Wu,Jinbo Xue,Caimei Fan
The efficient capture of CO 2 molecules is a crucial step in the light-driven CO 2 synthesis of high value-added products. In this work, CeO 2 is embedded in polyacrylonitrile-based carbon spheres (PANACSs) via a suspension polymerization and carbonization method to synthesise CeO 2 @PANACSs with bifunction (CO 2 adsorption and reduction ablity), and the strong oxidising capacity Bi 2 Fe 4 O 9 was coupled to obtain ternary Bi 2 Fe 4 O 9 /CeO 2 @PANACSs composites with high adsorption-reduction capacity for CO 2 . The effective synergistic effects between Bi 2 Fe 4 O 9 and CeO 2 @PANACSs realize that the CO yield of ternary hybrid photocatalyst can reach as high as 256.1 μmol g −1 for 10 h, approximately 19.55 times, 1.45 times and 1.62 times higher than that of pristine PANACSs, Bi 2 Fe 4 O 9 and CeO 2 , respectively. The exceptional performance of Bi 2 Fe 4 O 9 /CeO 2 @PANACSs composites is mainly attributed to the synergistic effect of the ternary system, which not only provides CO 2 -rich adsorption-reduction active sites but also effectively inhibits photogenerated electron-hole complexation. Meanwhile, the outer layer of Bi 2 Fe 4 O 9 with its excellent oxidising capacity also provides a large amount of H* to ensure efficient hydrodeoxygenation of CO 2 . Finally, combined with the results of in situ fourier transform infrared spectra, a possible mechanism for the photocatalytic reduction of CO 2 over ternary photocatalysts is proposed. Our finding provides a noteworthy promising strategy to construct bifunctional composite photocatalysts for achieving the high-efficient CO 2 adsorption and photoreduction to CO.
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
Small
·
2023
·Vol. 19
·期 15
·2207202
·
IF 13.3
Yunpeng Liu,Jiajun Zhong,Ziyi Liu,Wen Wen,Bo Sun,Hao Wang,Lei Yao,Zhongjun Chen,Dongqi Wang,Zhonghua Wu
As an important multiferroic material, pure and low-dimensional phase-stable bismuth ferrite has wide applications. Herein, one-pot hydrothermal method was used to synthesize bismuth ferrite. Almost pure Bi 2 Fe 4 O 9 , BiFeO 3 , and their mixture were successfully obtained by controlling the KOH concentration in the hydrothermal solutions. The as-prepared Bi 2 Fe 4 O 9 products were crystalline with Pbam space group, had nanosheet morphology, and tended to aggregate into nanofloret or random stacking. Each Bi 2 Fe 4 O 9 nanosheet was a single crystal with (001) plane as its exposed surface. Single unit-cell layered Bi 2 Fe 4 O 9 nanosheets had a uniform thickness of 1 nm. The surface energies of various (100), (010), and (001) planes were 3.6–4.0, 5.6–15.1, and 1.7–3.0 J m −2 , respectively, in the Bi 2 Fe 4 O 9 crystal. The formation mechanism and structural model of the as-prepared single unit-cell layered Bi 2 Fe 4 O 9 nanosheets have been given. The growth of Bi 2 Fe 4 O 9 nanosheets was discussed. Thermal analysis showed that the Bi 2 Fe 4 O 9 phase was stable up to 1260 K. The thermal expansion behavior of the Bi 2 Fe 4 O 9 nanosheet was nonlinear. The thermal expansion coefficients of the ultrathin Bi 2 Fe 4 O 9 nanosheets on the a -, b -, c -axes, and on the unit-cell volume V were determined, showing an anisotropic thermal expansion behavior. This study is helpful for the controllable synthesis of ultrathin Bi 2 Fe 4 O 9 nanosheets.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
npj Clean Water
·
2024
·Vol. 7
·期 1
·1-14
·
IF 10.4
Chen Weizi,Xing Zipeng,Zhang Na,Cheng Tao,Ren Bo,Liu Xinyue,Wang Zibin,Li Zhenzi,Zhou Wei
Hierarchical Bi 2 Fe 4 O 9 /BiOI S-scheme nanoflower heterostructures are prepared by hydrothermal method, which exhibit exceptional photo-piezoelectric catalytic performance. The tight binding between the sheets ensures the efficient electron transport, and provides a large interface area and adequate reaction sites for photo-piezoelectric catalytic reactions. At the same time, because the water flow in the water body produces hydraulic shear force on the material, the material produces piezoelectric effect. Bi 2 Fe 4 O 9 /BiOI exhibit a remarkable degradation efficiency of 99.4% for tetracycline and a hydrogen production rate of 4089.36 µmol h −1 g −1 . The observed behavior can be explained by the combined influence of the formation of S-scheme structure and the process of photo-piezoelectric catalysis, confirmed by in-situ XPS, transient/steady-state fluorescence and piezoelectric response force test. The excellent stability of the material suggests its possible use in the sectors of energy and environment. This work introduces novel concepts for the future advancement of photo-piezoelectric synergistic catalysis.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Qianqian Nie,Linfeng Liu,Jiayou Liu,Mingwei Shen,Xiaoxiang Huang,Zhongchao Tan,Hesheng Yu
Bi2Fe4O9/ZnIn2S4 (BFO/ZIS) composites are synthesized by using a facile impregnation method and tested for the photocatalytic degradation of xanthate for the first time. The effects of multiple parameters, including catalyst dosage and the pH value of solution, on xanthate photodegradation are investigated systematically. Furthermore, the photocatalytic mechanisms of BFO/ZIS are proposed based on various characterizations and density functional theory calculations. Results show that the degradation efficiency of 30BFO/ZIS is 98.25% during 90 min of visible light irradiation, which is 2.63 and 2.89 times higher than that of pure ZIS and BFO, respectively. This is mainly because the type II heterojunction formed between BFO and ZIS improves the separation of photogenerated carriers. Furthermore, the xanthate photodegradation efficiency of 30BFO/ZIS decreases slightly from 98.25 to 92.86% after four cycles, indicating its excellent durability and stability. Finally, the chemical oxygen demand (COD) removal efficiency of 30BFO/ZIS is up to 81.06%, exhibiting a high degree of mineralization.
研究领域:
材料科学
·
环境科学
·
化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Guanwei Peng,Yanyu Xie,Ying Wang,Qi Yu,Youyi Huang,Shuwu Liu,Limin Lu
Peroxymonosulfate (PMS)-assisted photocatalytic processes are economical and green strategies for the treatment of pesticide pollution. However, its degradation efficiency is severely hindered by the sluggish kinetics of active centers regeneration and low charge-transfer. Herein, S-scheme Bi 2 Fe 4 O 9 /BiOBr heterogeneous material was designed to activate PMS for thiabendazole (TBZ) degradation. Bi 2 Fe 4 O 9 and BiOBr have similar structural unit of [Bi 2 O 2 ] 2+ to share the Bi-O bonds, which is favorable to form asymmetric interface and enhance the polarization. Based on these unique characteristics between Bi 2 Fe 4 O 9 and BiOBr, a robust internal electric field in the S-scheme heterojunction is built, which could provide driving force to boost the electron-transfer process and encourage the sustainable regeneration of Fe 2+ . After optimizing the proportion of Bi 2 Fe 4 O 9 on the composite, it was found that 50 wt% Bi 2 Fe 4 O 9 /BiOBr (BFB-50) exhibits the best TBZ removal efficiency after 30 min visible light irradiation, which is 2.25 and 12 folds compared to Bi 2 Fe 4 O 9 and BiOBr, respectively. Furthermore, electron paramagnetic resonance (EPR) and radical trapping experiments indicate that 1 O 2 and SO 4 •- involving oxidation mechanism impart maximum contribution towards TBZ degradation. The possible pathways of TBZ degradation are reasonably proposed by the HPLC-MS and the toxicity evolution of TBZ is appraised using the ECOSAR software. This study provides an insight into the fabrication of S-scheme heterojunction for environment remediation through the photocatalysis/sulfate-mediated advanced oxidation process.
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
Surfaces and Interfaces
·
2025
·
IF 6.3
Zhongyi Zhang,Junjie Ma,Edwin Hena Dawolo,Bingfa Chen,Ning Ding,Hong Liu
In order to effectively degrade tetracycline (TC), a novel B i PO 4 / B i 2 F e 4 O 9 photocatalytic composite was created in this study. When compared to several bismuth-based photocatalytic materials, the system demonstrated excellent degradation activity. PMS is activated under visible light irradiation. System B i PO 4 / B i 2 F e 4 O 9 /PMS/Vis removes 89.3% of TC in 60 minutes. Based on the energy band structures of B i 2 F e 4 O 9 and B i PO 4 , the catalytic efficiency of the composites could be explained by type Z heterojunction mechanism. Superoxide radicals and holes are the primary causes of TC degradation, as shown by experiments using electron paramagnetic resonance and free radical entrapment. In addition, the system B i PO 4 / B i 2 F e 4 O 9 /PMS/Vis maintained its high degradation capacity and pristine composition after multiple recycling. The reaction system's TC degradation was not considerably impacted by pH, anions, or ionic strength. The TC degradation intermediates demonstrated a noteworthy decrease in toxicity within the BPFO-10/PMS/Vis system, hence guaranteeing the intermediates' safe conversion. These findings highlight the significant potential of the novel bismuth-based photocatalytic composite for degrading emerging pollutants in wastewater.
研究领域:
环境科学
·
材料科学
·
光催化技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）