Royal Society Open Science
·
2022
·Vol. 9
·期 11
·
IF 3.653
Yao Li,Xiangyu Meng,Yin Pang,Cong Zhao,Daoping Peng,Yu Wei,Bayongzhong Xiang
In this study, red mud (RM) was used as a support for LaFeO3 to prepare LaFeO3-RM via the ultrasonic-assisted sol–gel method for the removal of methylene blue (MB) assisted with bisulfite (BS) in the aqueous solution. Characterization by scanning electron microscopy and the Brunauer–Emmett–Teller method indicated that LaFeO3-RM exhibited a large surface area and porous structure with a higher pore volume (i.e. 10 times) compared with the bulk LaFeO3. The XRD, XPS and FTIR results revealed that the support of porous RM not only dispersed LaFeO3 particles but also increased Fe oxidation capability, oxygen-containing functional groups and chemically adsorbed oxygen (from 44.3% to 90.3%) of LaFeO3-RM, which improved the catalytic performance in structure and chemical composition. MB was removed through the synergistic effect of adsorption and catalysis, with MB molecules first absorbed on the surface and then degraded. The removal efficiency was 88.19% in the LaFeO3-RM/BS system under neutral conditions but only 27.09% in the LaFeO3/BS system. The pseudo-first-order kinetic constant of LaFeO3-RM was six times higher than that of LaFeO3. Fe(III) in LaFeO3-RM played a key role in the activation of BS to produce SO4⋅−SO4⋅− by the redox cycle of Fe(III)/Fe(II). Dissolved oxygen was an essential factor for the generation of SO4⋅−SO4⋅−. This work provides both a new approach for using porous industrial waste to improve the catalytic performance of LaFeO3 and guidance for resource utilization of RM in wastewater treatment.
研究领域:
环境化学
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材料科学
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催化化学
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废水处理
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功能材料
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工业固废资源化
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 17
·1-10
·
IF 2.8
Wang Wenjun,Wu Jingxuan,Zou Song,Luo Qingsong,Wang Zhenxing,Wan Yu,Wang Yimu,Feng Changhao
In this study, LaFeO 3 nanotubes were created using the electrostatic spinning method and then calcined at various temperatures. Investigations into the impact of calcined temperatures on the morphological properties of LaFeO 3 nanotubes used a variety of methods. The results show that the surface of LaFeO 3 nanotubes gradually became rougher when the calcination temperature was above 700 °C, which could enhance the gas-sensitive properties of n-butanol. The response of LaFeO 3 nanotubes is 45.3–100 ppm n-butanol at 150 °C, and the low detection limit is 0.3 ppm. In addition, LaFeO 3 nanotubes calcined at 700 °C were found to have excellent selectivity for n-butanol. The mechanism of calcination temperature on the improvement of gas-sensitive properties of LaFeO 3 nanotubes was also proposed.
研究领域:
材料科学
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纳米技术
·
传感器
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2023
·
IF 3.8
Jitong Deng,Yongjun Zhang,Xiaopeng Wang,Wei Zhang,Hongjing Han,Haiying Wang,Huimin Yuan,Yanan Zhang,Yanguang Chen
The effective utilization of natural gas resources is a promising option for the implementation of the “dual carbon” strategy. However, the capture of carbon dioxide with relatively lower concentration after the combustion of natural gas is the crucial step. Fortunately, the lattice oxygen is used for chemical cycle conversion of methane to overcome the shortcomings mentioned above. A method was proposed to synthesize perovskite for methane cycle conversion using meatl organic framework as a precursor. Morphology and pore structure of Fe 2 O 3 -LaFeO 3 composite oxides were regulated by precursor synthesis conditions and calcination process. Moreover, the chemical looping conversion performance of methane was evaluated. The results showed that the pure phase precursor of La[Fe(CN) 6 ]·5H 2 O was synthesized with the specific surface area of 23.91 m 2 ·g −1 under the crystallization of 10 h and the pH value of 10.5. Fe 2 O 3 -LaFeO 3 was obtained by controlled calcination of La[Fe(CN) 6 ]·5H 2 O and Fe 2 O 3 with variable mass ratio. The selectivity of CO 2 can reach more than 99% under the optimal parameters of methane chemical looping conversion: m (Fe 2 O 3 ): m (LaFeO 3 ) = 2:1, the reaction temperature is 900 °C, the lattice oxygen conversion is less than 40%. Fe 2 O 3 -LaFeO 3 still has good phase and structure stability after five redox reaction and regeneration cycles.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
Journal of Nanostructure in Chemistry
·
2022
·Vol. 13
·期 5
·481-495
·
IF 8
Jia Zi-ang,Zeng Qing-rui,Sun Yuan-bo,Feng Wei
A novel three-dimensional spherical LaFaO 3 /Bi 2 O 3 heterojunction was successfully constructed through a two-step synthesis, which included a biological template method and hydrothermal synthesis. Because of the addition of different quantities of LaFaO 3 , the as-prepared LaFaO 3 /Bi 2 O 3 composite showed different morphological structures, excitation energies, charge separation efficiencies, and degrees of photocatalytic performance. With the change in the amount of LaFaO 3 added, the morphology of the LaFaO 3 /Bi 2 O 3 complex changed from irregular clusters to a regular spherical structure. When the molar doping ratio of LaFaO 3 /Bi 2 O 3 was 1:2, it exhibited a near-perfect 3D spherical structure with external pyknotic grooves. The results of electrochemical impedance spectroscopy indicated that the 1:2 LaFeO 3 /Bi 2 O 3 catalyst exhibited the optimal charge separation efficiency. The bandgap of the prepared LaFaO3/Bi 2 O 3 composite changed from 1.95 eV (1:2) to 2.32 eV (3:4), which were lower than that of the Bi 2 O 3 template (2.81 eV). The 3D-spherical LaFaO 3 /Bi 2 O 3 catalyst almost completely removed 50 mg L −1 of tetracycline within 90 min. Electron spin resonance and radical trapping experiments revealed that radicals were the main oxidants in the photocatalytic reaction. The construction of a 3D floral spherically structured semiconductor composite photocatalyst improved the further degradation of tetracycline. Graphical abstract
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Yajun Ji,Yanping Xie,Lingyun Zheng,Feiya Xu
Sulfate radical-based advanced oxidation technology has been considered one of the most effective methods to remove organic pollutants from water. In this study, porous Co-doped LaFeO 3 catalysts were synthesized by the sol-gel method and applied in peroxymonosulfate (PMS) activation for organic pollutants degradation. The effects of catalyst dosage, PMS concentration, initial pH of the solution and radical scavenger on the degradation of Acid Red G (ARG) were systematically studied. The porous LaFeO 3 showed higher specific surface area (27.62 m 2 /g) and pore volume (0.15 cm 3 /g) than the traditional LaFeO 3 (7.83 m 2 /g and 0.11 cm 3 /g), resulting in higher activity. After doping Co, more oxygen vacancies generated. The catalytic activity of LaFe 1-x Co x O 3 was remarkably enhanced. ARG could be completely degraded in LaFe 0.90 Co 0.10 O 3 /PMS system within 10 min. The degradation rate was 51 times higher than that in the porous LaFeO 3 /PMS system. The superior activity can be attributed to the oxygen vacancies and synergistic effect of Co and Fe, which facilitated the activation of PMS and generated SO 4 •- and HO•. It was SO 4 •- that mainly contributed to the degradation of ARG. The detailed degradation pathway was proposed, according to the intermediate products of ARG degradation. Besides, the degradation rate of ARG by the as-prepared catalyst exceeded 80% even after using for 5 times.
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
Frontiers of Materials Science
·
2025
·Vol. 19
·期 3
·1-16
·
IF 2.3
Li Yumei,Deng Bingqian,Wang Jiexin,Li Jialong,An Wenbin,Fan Jian,Sun Peng
A molybdenum (Mo)-modified LaFeO 3 (LFMO) perovskite catalyst was synthesized to activate peroxymonosulfate (PMS) for the degradation of indole in solution. The catalyst was characterized by XRD, SEM, and XPS. Results indicate that LFMO possesses a higher specific surface area and more catalytic active sites compared to unmodified LaFeO 3 . XPS analysis reveals that the activation of PMS is mediated by Fe 2+ /Fe 3+ and Mo 4+ /Mo 6+ reduction–oxidation cycles. Oxygen vacancies generated by molybdenum substitution serve as reaction sites, which accelerate the dissociation of PMS and the production of reactive oxygen species. Chemical quenching experiments and EPR spectroscopic analyses were employed to elucidate the mechanism, highlighting the significant role of non-radical species in the removal of indole. Under optimal reaction conditions, the degradation efficiency of indole reached 90.53% within 30 min, demonstrating strong anti-interference against inorganic anions and natural organic matter. LFMO particles exhibit sustained catalytic activity and stability over five consecutive cycles. This LFMO/PMS system provides valuable insights for the development of non-radical degradation pathways based on PMS.
研究领域:
环境化学
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催化科学
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材料化学
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环境污染控制
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高级氧化过程
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DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Yaohong Zhou,Wenqi Wang,Yujing Jin,Peng Wang,Suqin Wu,Changxi Deng,Wanming Xiong,Xiaohua Zhang
Developing high-performance acid-base catalysis over perovskite for alcohol aerobic oxidation has received increasing attention, but the fundamental understanding of its surface acid-base property and performance relationship remains largely unknown. Accordingly, a series of LaFeO 3 perovskites were fabricated via modified Pechini approach with the addition of different chelating agents to modulate their respective acid-base amount and oxygen vacancy concentration, which subsequently were employed in the aerobic oxidation of vanillyl alcohol (a lignin model), to generate vanillin for elucidating the relationships between the catalytic activity of LaFeO 3 perovskite and its acid-base property as well as oxygen vacancy. The results demonstrated that existence of non-linear relationships between the vanillin yield and the acid-base amount as well as oxygen vacancy concentration of LaFeO 3 catalyst. Moreover, neither acid-base sites nor oxygen vacancies were the solely factors affecting the activity of LaFeO 3 perovskite towards vanillyl alcohol oxidation for vanillin production. Mechanism studies proclaimed that the reactive oxygen species derived from the adsorption of molecule oxygen on oxygen vacancies generated by anion defects combing with Lewis acid sites (Fe 3+ /Fe 2+ ) to yield FeO x active pairs, which jointly dominated the pathway for vanillyl alcohol oxidation to produce vanillin. Overall, this work offers guidance for designing effective perovskite-based catalysts for lignin conversion to produce value-added chemicals by selectively modulating its acid-base property and oxygen vacancy.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Gongduan Fan,Zhong Chen,Zhongsen Yan,Banghao Du,Heliang Pang,Dingsheng Tang,Jing Luo,Jiuyang Lin
A novel plasmonic Ag/AgCl@LaFeO 3 (ALFO) photocatalyst was successfully synthesized by a simple in-situ synthesis method with enhanced photocatalytic activity under visible light for harmful algal blooms (HABs) control. The structure, morphology, chemical states, optical and electrochemical properties of the photocatalyst were systematically investigated using a series of characterization methods. Compared with pure LaFeO 3 and Ag/AgCl, ALFO-20% owned a higher light absorption capacity and lower electron–hole recombined rate. Therefore, ALFO-20% had higher photocatalytic activity with a near 100% removal rate of chlorophyll a within 150 min, whose kinetic constant was 15.36 and 9.61 times faster than those of LaFeO 3 and Ag/AgCl. In addition, the changes of zeta potential , cell membrane permeability, cell morphology, organic matter, total soluble protein, photosynthetic system and antioxidant enzyme system in Microcystis aeruginosa ( M. aeruginosa ) were studied to explore the mechanism of M. aeruginosa photocatalytic inactivation. The results showed that ALFO-20% could change the permeability and morphology of the algae cell membrane, as well as destroy the photosynthesis system and antioxidant system of M. aeruginosa . What’s more, ALFO could further degrade the organic matters flowed out after algae rupture and die, reducing the secondary pollution and avoiding the recurrence of HABs. Finally, the species of reactive oxygen species (ROS) (mainly •O 2 - and •OH) produced by ALFO were determined through quenching experiments, and a possible photocatalytic mechanism was proposed. Overall, ALFO can efficiently remove the harmful algae under the visible light, providing a promising method for controlling HABs.
研究领域:
环境科学
·
光催化技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Heliyon
·
2024
·
IF 3.4
Aftab Khan,Samreen Sadiq,Iltaf Khan,Muhammad Humayun,Guo Jiyuan,Muhammad Usman,Abbas Khan,Shoaib Khan,Amal Faleh Alanazi,Mohamed Bououdina
Modern industries rapid expansion has heightened energy needs and accelerated fossil fuel depletion, contributing to global warming. Additionally, organic pollutants present substantial risks to aquatic ecosystems due to their stability, insolubility, and non-biodegradability. Scientists are currently researching high-performance materials to address these issues. LaFeO 3 nanosheets (LFO-NS) were synthesized in this study using a solvothermal method with polyvinylpyrrolidone (PVP) as a soft template. The LFO-NS demonstrate superior performance, large surface area and charge separation than that of LaFeO 3 nanoparticles (LFO-NP). The LFO-NS performance is further upgraded by incorporating ZIF-67. Our results confirmed the ZIF-67/LFO-NS nanocomposite have superior performances than pure LFO-NP and ZIF-67. The integration of ZIF-67 has enhanced the charge separation and promote the surface area of LFO-NSwhich was confirmed by various characterization techniques including TEM, HRTEM, DRS, EDX, XRD, FS, XPS, FT-IR, BET, PL, and RAMAN. The 5ZIF-67/LFO-NS sample showed significant activities for CO 2 conversion, malachite green degradation, and antibiotics (cefazolin, oxacillin, and vancomycin) degradation. Furthermore, stability tests have confirmed that our optimal sample very active and stable. Furthermore, based on scavenger experiments and the photocatalytic degradation pathways, it has been established that H + and •O 2 − are vital in the decomposition of MG and antibiotics. Our research work will open new gateways to prepare MOFs-Perovskites nanocatalysts for exceptional CO 2 conversion, organic pollutants and antibiotics degradation.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 6
·8781-8797
·
IF 0
Al-Nayili Abbas,Alhaidry Wissam A.
Herein, novel surface structure LaFeO 3 /nitrogen-deficient g-C 3 N 4 nanocomposites (LaFeO 3 /g-C 3 N 4 -H) have been successfully synthesized by a two-step process. First, nitrogen-deficient graphitic carbon nitride (g-C 3 N 4 -H) was produced by thermally condensing melamine that had been treated with acetic acid as a precursor. After that, LaFeO 3 was incorporated into the g-C 3 N 4 -H nanosheets. The as-prepared nanostructured materials were characterized by XRD, FT-IR, N 2 adsorption–desorption experiments, FESEM, and TEM, demonstrating the formation of interfacial interaction and heterogeneous structure in LaFeO 3 /g-C 3 N 4 -H nanocomposites. Additionally, UV–vis diffuse reflectance spectra (DRS) and photoluminescence spectra (PL) have been used to assess the optical properties of the nanohybrids. The results show that the LaFeO 3 /g-C 3 N 4 -H nanocomposite was successfully produced with a reliable interfacial interface, and produced a good heterojunction relationship between g-C 3 N 4 -H and LaFeO 3 which may significantly boost the photocatalytic activity as compared to prinstine g-C 3 N 4 and LaFeO 3 . Phenol degradation under visible light irradiation was used to test the photocatalytic activity of LaFeO 3 /g-C 3 N 4 -H, and the results showed that 10%-LaFeO 3 /g-C 3 N 4 -H had significant photocatalytic activity and remarkable adsorption efficiency, with an overall removal rate of phenol up to 88% after 180 min of visible light irradiation. This study may present a novel method for developing highly efficient artificial photocatalytic systems.
研究领域:
材料科学
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环境科学
·
纳米技术
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催化
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物理化学
✓ 已验证
DOI
Reaction Chemistry & Engineering
·
2021
·Vol. 6
·期 12
·2411-2424
·
IF 4.239
Shuaiqi Ning,Shuai Mao,Chun Liu,Mingzhu Xia,Fengyun Wang
In this paper, some perovskite catalysts LaFeO3 (LFO) were prepared by using the efficient chelating properties of sodium diethylene triamine pentamethylene phosphonate (DTPMP-2Na) toward metal ions, and the best catalyst LFO-0.1 was selected by using diclofenac sodium as the target pollutant. Then, the influence of different factors (PMS dosage, catalyst dosage, substrate concentration and anion) on the degradation of DCF in a LFO-0.1/PMS system was studied. The catalyst was characterized, and the reaction mechanism of diclofenac (DCF) in the LFO-0.1/PMS system was analyzed. It was concluded that hydroxyl radicals, sulfate radicals and singlet oxygen were produced in the LFO-0.1/PMS system. In the reaction system, singlet oxygen is considered to be the main factor for DCF degradation in this system, and the generation of sulfate radicals is mainly attributed to oxygen vacancies and the electron transfer between Fe3+ and Fe2+. Through the centrifugal recovery of the catalyst to explore its stability, the conclusion is that LFO-0.1 is a stable catalyst. Finally, 15 kinds of oxidation intermediates and products were identified, and the possible degradation pathways of DCF were analyzed, including decarboxylation, dechlorination, C–N cleavage, hydroxylation, ring-closure and ring-opening.
研究领域:
环境科学
·
催化化学
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DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 21
·215601
·
IF 3.551
Dongming Zhang,Mingpeng Chen,Haiyuan Zou,Yumin Zhang,Jicu Hu,Huapeng Wang,Baoye Zi,Jin Zhang,Zhongqi Zhu,Lele Duan,Qingju Liu
To address the urgent issues of hazardous gas detection and the prevention of environmental pollution, various functional materials for gas sensing and catalytic reduction have been studied. Specifically, the p-type perovskite LaFeO3 has been studied widely because of its promising physicochemical properties. However, there remains several problems to develop a controllable synthesis of LaFeO3-based p-n heterojunctions. In this work, α-Fe2O3 was further compounded with LaFeO3 to form a porous and hollow α-Fe2O3/LaFeO3 heterojunction to improve its gas-sensing performance and photocatalytic efficiency via a microwave-assisted hydrothermal method. While evaluated as sensors of acetone gas, the optimized sample exhibits excellent performance, including a high response (48.3), excellent selectivity, good reversibility, fast response, and recovery ability. Furthermore, it is an efficient catalyst for the degradation of methylene blue. This can be attributed to the enhancement effect of its larger specific surface area, fast diffusion, enhanced surface activities, and p-n heterojunction. Additionally, this work provides a rapid and rational synthesis strategy to produce metal oxides with both enhanced gas-sensing performance and improved photocatalytic properties.
研究领域:
材料科学
·
环境科学
✓ 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）