CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Qingsong Luo,Yan Chen,Changhao Feng,Shuang Gao,Tianyu Lan,Qiyuan Fu,Runduo Teng
For applications in environmental protection, industrial production, and personal health monitoring by breath exhalation, the sensitive and selective detection of n-butanol is of extreme importance. An n-butanol gas sensor has been developed utilizing LaFeO 3 nanofibers doped with Er 3+ by an electrospinning technique. Compared to the pure sample, the gas sensor shows an improved response of 58.97 to 30 ppm n-butanol, which was boosted by 5.99-fold due to the smaller average grain sizes (21.2 nm), porosity of the nanofiber, and abundant chemical-absorbed oxygen species (38.5%) at an Er doping level of 3 at%. It has excellent selectivity to n-butanol, a fast response/recovery time (17 s/27 s), superior stability during 30 days, and a low detection limit (100 ppb), which indicates that Er-doped LaFeO 3 nanofibers have excellent sensing capabilities for real-time n-butanol detection.
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2017
·Vol. 28
·期 39
·394003
·
IF 3.44
Tao Fang,Yongsheng Guo,Songhua Cai,Ningsi Zhang,Yingfei Hu,Shiying Zhang,Zhaosheng Li,Zhigang Zou
Many metal-oxide candidates for photoelectrochemical water splitting exhibit localized small polaron carrier conduction. Especially hematite (α-Fe2O3) photoanodes often suffer from low carrier mobility, which causes the serious bulk electron-hole recombination and greatly limits their PEC performances. In this study, the charge separation efficiency of hematite was enhanced greatly by coating an ultrathin p-type LaFeO3 overlayer. Compared to the hematite photoanodes, the solar water splitting photocurrent of the Fe2O3/LaFeO3 n–p junction exhibits a 90% increase at 1.23 V versus the reversible hydrogen electrode, due to enlarging the band bending and expanding the depletion layer.
研究领域:
材料科学
·
光电化学
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DOI
高影响因子
SURFACE REVIEW AND LETTERS
·
2019
·
IF 0.748
DONGJING LIU,WEIGUO ZHOU,JIANG WU
Perovskite LaFeO 3 /ZSM-5 is synthesized via citrate route for H 2 S removal at high temperatures. It shows good thermal stability after heat treatment at 500–700 ∘ C with respect to slight changes in crystallographic phase and textural property. It presents the optimal desulfurization performance at 600 ∘ C with sulfur capacity of 1017 μ mol S/g and products of S, LaS 2 , and Fe 7 S 8 . Sulfidation at 500 ∘ C yields the same products as sulfidation at 600 ∘ C but displays the lowest sulfur capacity of 408 μ mol S/g. Sulfidation at 700 ∘ C produces La 2 O 2 S, Fe 3 S 4 , and unreacted LaFeO 3 . The activation energy of the sulfidation reaction over LaFeO 3 /ZSM-5 is 109.6 kJ/mol.
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
CATALYSIS LETTERS
·
2017
·Vol. 148
·期 1
·23-29
·
IF 2.799
Li Jinlin,Guan Weisheng,Yan Xu,Wu Ziyang,Shi Weidong
Abstract In this paper, LaFeO 3 nanoparticles were used as a visible light photocatalyst for efficient removal of 2,4-dichlorophenoxyacetic acid (2,4-D) with the assist of ozone. The pseudo-first-order kinetic rate constants of degrading 2,4-D removal in 60-PO/Vis in 1 h was 5.72 times as great as the sum of that when using LFO/O 2 /Vis and 60-Oz/Vis at the best concentration of ozone (60 mL/min). This improvement was attributed to the efficient synergistic effect between photocatalysis and ozonation triggered by LaFeO 3 . In PO/Vis, ozone facilitates the photo-generated electrons trapping and improves separation efficiency of photo-generated charges, which enhanced the yield of hydroxyl radical, so as to the degradation efficiency of organic pollutants. In addition, the effects of ozone concentrations on the photocatalytic ozonation processes were also studied. Moreover, we demonstrated the high stability and reusability of LaFeO 3 photocatalyst in photocatalytic ozonation process by circle experiment. Graphical Abstract Schematic illustration of the reaction mechanism of enhanced photocatalytic ozonation of 2,4-D by LaFeO 3 under visible light.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Boyan Fu,Leyao Bi,Kexin Zhao,Jiahui Lin,Junsheng Wen,Chunjie Wang,Yue Wang
In this study, LaFeO 3 nanoparticles were synthesized using the hydrothermal method with three different types of surfactants (cationic, anionic, and non-ionic). The products were characterized with various techniques to determine their phase structures, morphologies, sensing abilities, and electrochemical performance. The results indicate that LaFeO 3 prepared with cetyltrimethylammonium bromide (CTAB) as a surfactant (LFO-C) showed a pure orthorhombic perovskite phase with a highly porous surface morphology, and exhibited the largest specific surface area and the lowest impedance among the three materials. The gas-sensing properties of corresponding sensors were also investigated. It is worth noting that LFO-C demonstrated remarkable sensitivity to ethanol at the temperature of 220 °C, with the response reaching 16.1 and a response/recovery time of 35.1 and 25.2 s, respectively. The response of LFO-C is more than twice that of the other two samples with sodium dodecylbenzenesulfonate (SDBS) and polyethylene glycol (PEG) as surfactants. Moreover, LFO-C sensor demonstrated a detection limit of 500 ppb. These findings suggest that CTAB as a cationic surfactant can effectively enhance the gas-sensing performances of LaFeO 3 . Furthermore, the adsorption energy of three samples was calculated by first-principles calculation, and LFO-C possessed strong adsorption capacity for ethanol.
研究领域:
材料科学
·
化学
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DOI
高影响因子
IEEE SENSORS JOURNAL
·
2024
·
IF 4.3
Jingxuan Wu,Yu Wan,Zhenxing Wang,Yimu Wang,Qingsong Luo,Changhao Feng,Tatsuo Yoshinobu
The efficient and reliable monitoring of acetic acid (CH3COOH) is significant to environmental protection and human healthcare. LaFeO3 is a potential sensing material for CH3COOH with its good sensitivity and high plasticity. To further improve the sensing properties of LaFeO3 to meet the requirements of applications, we successfully utilized the facile electrospinning technique to fabricate a series of CH3COOH-sensitive Ag-doped (0–5 mol%) LaFeO3 nanotubes. The systematic characterization shows that the appropriate content (4 mol%) of Ag doping can effectively ameliorate the material morphology to realize loose porous structures. Meanwhile, the sensitization effect of Ag and ameliorated morphology significantly enhance the gas-sensing properties of LaFeO3 to CH3COOH vapor. The optimal Ag-doped LaFeO3 (4 mol%) loose nanotubes-based gas sensor results in a detection limit of 0.5 ppm and 3.6-fold enhancement of the response to 100-ppm CH3COOH compared with the pure LaFeO3 compact nanotubes at a low operating temperature (150 °C). It also exhibits excellent selectivity to CH3COOH and good long-term stability. Therefore, Ag-doped LaFeO3 can be regarded as a promising material for sensing CH3COOH in practical applications. Finally, the mechanism of enhanced gas-sensing properties is discussed.
研究领域:
材料科学
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环境科学
·
传感器技术
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DOI
高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 13
·3454-3468
·
IF 5.726
Huixian Zhong,Jiaming Wang,Kang An,Kegong Fang,Yuan Liu
A catalyst with a novel composition for direct ethanol synthesis from syngas was prepared and investigated in this work, which is Rh nanoparticles (NPs) highly dispersed on La2O3 modified LaFeO3, and the Rh NPs/La2O3–LaFeO3 was loaded on SiO2 with high surface area. The catalyst was prepared by using LaFe1−xRhxO3 in the perovskite phase as the precursor, which was transformed to Rh/La2O3–LaFeO3/SiO2 after reduction. The results showed that, compared to Rh–La2O3/SiO2, the activity and selectivity to ethanol were improved markedly, which was ascribed to the well-matched catalyzing process by the active sites of Rh0, Rh+ (or Rhδ+) and the oxygen vacancies on the surface of LaFeO3; of those, Rh0 dissociatively adsorbed CO and the latter two associatively adsorbed CO. Moreover, the interaction of La2O3 and LaFeO3 donated electrons to rhodium, which effectively adjusted the ratio of CO adsorbed associatively and dissociatively, and thus improved the selectivity to ethanol and lowered the selectivity to methanol. The catalyst also exhibited excellent resistance to the sintering of Rh NPs and to carbon deposition, which was attributed to the confinement of Rh NPs by La2O3 and LaFeO3, the eliminating effect of La2O3 and LaFeO3 and the very high dispersion of Rh NPs.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Zhou Cao,Yunpu Zhao,Zhaohui Zhou,Qizhao Wang,Qiong Mei,Hongfei Cheng
Long-term exposure to antibiotic may have adverse effects on human health including carcinogenesis or teratogenicity and the emergence of antibiotic resistance. Developing effective catalysts to degrade antibiotic pollution is an urgent demand. Herein, a heterogeneous photo-Fenton catalyst with enhanced tetracycline hydrochloride (TCH) degradation activity was developed by hydrothermally synthesizing lanthanum ferrite (LaFeO 3 ) and bismuth iodide oxide (BiOI). LaFeO 3 /BiOI showed excellent repeatability and stability, and still maintained an extremely high degradation efficiency of 80.6% after three cycles. The LaFeO 3 /BiOI with 35 wt% LaFeO 3 showed significantly enhanced degradation rate (93.6%) of TCH within 40 mins in the photo-Fenton system, compared with single photocatalytic degradation (41.2%) and Fenton degradation (83.1%). The parameter characterization and quenching experiments were carried out on the heterojunction . The possible degradation mechanisms of TCH were proposed. The results indicated that the existence of the built-in electric field in the heterojunction effectively promote the separation of photogenerated electrons and hole pairs. The photoelectrons activate H 2 O 2 to generate OH and accelerate Fe III /Fe II conversion. This work has developed a promising heterogeneous photo-Fenton catalysts, and stipulated some new insights for the removal of antibiotic pollutants.
研究领域:
环境科学
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材料科学
·
生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2024
·
IF 2.5
Liang Yan,Yujing Zhang,Yilin Zhang,Rui Liu,Chuyang Liu,Fan Wu,Xuefei Miao,Er Liu,Xiaoling Peng,Jing Li,Shan Tao,Feng Xu
LaFeO 3 perovskite has possessed great potential in the field of microwave absorption considering its outstanding dielectric and magnetic properties. In this work, Bi-doped LaFeO 3 powders (BLFO) were prepared by a simple solid state reaction method. The results have demonstrated that the crystalline of LaFeO 3 and the lattice oxygen are increased with the additionally introduced Bi. As a result, the samples could exhibit the strongest microwave absorption with the minimum reflection loss (RL min ) of −39.48 dB and the effective absorption band (EAB) of 3.63 GHz (10.28–13.91 GHz) at a filling ratio of 60 wt%. The excellent microwave absorption properties are ascribed to the enhanced conductive loss, polarization relaxation and the co-existed magnetic loss. Moreover, the optimum sample exhibits the radar cross-section values below −10 dBm 2 across a wide angular range of −90° to 90° with a thickness of 2.5 mm. Therefore, this work opens up a feasible and effective way for modulating the electromagnetic properties of perovskite materials as potential microwave absorbents.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 19
·5534
·
IF 3.623
Wen Jiang,Liwei Cheng,Jianghui Gao,Shiyu Zhang,Hao Wang,Zhihao Jin,Zhongfeng Tang,Cheng Peng
Substantial effort has been devoted to fabricating nanocrystalline lanthanum ferrite (LaFeO3), and calcination is the crucial process of crystallization in both high-temperature strategies and wet chemical methods. Lowering the calcination temperature gives the ability to resist the growth and agglomeration of nanoparticles, therefore contributing to preserve their unique nanostructures and properties. In this work, we prepared crystalline LaFeO3nanoparticles with a calcination process at 500 °C, lower than the calcination temperature required in most wet chemistry methods. Correspondingly, the experimental conditions, including stoichiometric ratios, pH values, precipitants, complexant regent, and the calcination temperatures, were investigated. We found that the crystalline LaFeO3was formed with crystalline NaFeO2after calcination at 500 °C. Furthermore, the structure of FeO6octahedra that formed in coprecipitation was associated with the process of crystallization, which was predominantly determined by calcination temperature. Moreover, an illusion of pure-phase LaFeO3was observed when investigated by X-ray diffraction spectroscopy, which involves amorphous sodium ferrite or potassium ferrite, respectively. These findings can help prepare nanostructured perovskite oxides at low calcination temperatures.Keywords:crystalline LaFeO3nanoparticles;coprecipitation;calcination;FeO6octahedra;perovskite
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Hongfang Shen,Tong Xue,Yanmin Wang,Guozhong Cao,Youjun Lu,Guoli Fang
Perovskite LaFeO 3 nanoparticles with an orthorhombic structure were synthesized by a sol-gel route and subsequent vacuum microwave calcination. The effects of vacuum microwave calcination temperature and duration on the formation of LaFeO 3 single phase were investigated. The use of vacuum microwave calcination can effectively reduce the crystallization time of LaFeO 3 nanoparticles. The synthesized LaFeO 3 nanoparticles have a perfect crystal structure, a single phase composition without any impurity, uniform particle size, and a suitable energy band of ∼1.86 eV. According to the PL spectrum of LaFeO 3 nanoparticles, the recombination rate of photo-generated electrons and holes can be reduced due to the use of vacuum microwave calcination. Furthermore, LaFeO 3 nanoparticles calcined by vacuum microwave calcination have a superior visible photo-catalytic efficiency on organic dye methyl orange and methyl blue, and a higher photodegradation efficiency rate, compared to those calcined by conventional calcination. LaFeO 3 nanoparticles obtained by vacuum microwave calcination at 700 °C for 30 min (sample MW-700-30) exhibits superior photocatalytic efficiency, and the MB and MO dye solution in the presence of LaFeO 3 nanoparticle becomes colorless during 240 min under visible light irradiation. The photodegradation process of MB on the as-synthesized LaFeO 3 follows a pseudo-first-order kinetic process.
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
Scientific Reports
·
2024
·Vol. 14
·期 1
·1-15
·
IF 3.8
Hao Pengcheng,Shi Rui,Wang Xuanhang,Zhang Juan,Li Bo,Wang Jing,Liu Bo,Liu Yayuan,Qiao Xin,Wang Zhongzhi
Efficient harnessing of solar energy presents a significant challenge in environmental cleanup efforts. This study develops a highly effective carbon quantum dots-modified hollow core-shell TiO 2 -LaFeO 3 heterojunction photocatalyst (CDs-TLFO). Structural analysis confirmed that nanosheets are loaded with CQDs, forming a hollow core-shell structure with intimate interconnection. Photocatalytic experiments reveal that CDs-TLFO degrads tetracycline hydrochloride (TC) 2.02 times faster than TLFO alone, and significantly outperformes h-TiO 2 and LaFeO 3 (11.28 and 2.78 times, respectively). This enhancement is attributed to CQDs acting as electron acceptors with upconversion properties, enhancing the separation of e – -h + pairs and boosting visible light absorption. Integration of CQDs onto the TLFO surface creates numerous active sites and enhances visible light absorption. SEM and TEM tests confirm that the catalyst has a hollow core-shell structure. ESR tests and radical trapping experiments indicate that the high degradation efficiency of the catalyst mainly owns to the synergistic effect of hydroxyl radicals (·OH) and superoxide radicals (·O 2 − ). The reusability and stability of the catalysts are investigated, potential TC degradation pathways are proposed as well as the photocatalytic reaction mechanism is revealed. This research introduces promising avenues for environmental cleanup and offers a straightforward, energy-efficient, and environmentally friendly method for producing CDs-TLFO heterojunction materials with superior photocatalytic capabilities.
研究领域:
环境科学
·
材料科学
·
光催化技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）