VACUUM
·
2023
·
IF 4
Chaoqun Yan,Zhiliang Cheng,Xuan Zhang,Juan Wei,Qian Xu
The photocatalytic efficiency of hematite (α-Fe 2 O 3 ) is limited by its photoexcited state lifetime and diffusion length. By adjusting the surface structure, the photogenerated electron pairs can migrate to the surface and the charge recombination can be suppressed, which can effectively solve these problems and improve the photo-Fenton performance. In this study, four kinds different morphologies of α-Fe 2 O 3 - x (truncated hexagonal bipyramidal, cubic, hexagonal shape, and spherical) were synthesized by hydrothermal method , and a photocatalyst (H-α-Fe 2 O 3 - x ) with higher catalytic activity was prepared by hydrogenation. The results of UV–Vis DRS , PL , Raman, and XPS analysis , the oxygen vacancies and Fe (II) species were introduced into the α-Fe 2 O 3 catalyst after the hydrogenation reaction. The H-α-Fe 2 O 3 - x showed good degradation performance for TC and DX as EMPs model pollutants. The results show that the formation of oxygen vacancy and Fe 2+ is the main factor to improve the photocatalytic activity of the reaction system. Furthermore, the reaction mechanism revealed that reactive radicals involved in the H-α-Fe 2 O 3 - x photocatalytic system were •OH, •O 2 − , and h + responsible. This study provides an alternative technology for an easy and effective means for bandgap engineering to improve the photocatalytic performance of photocatalysts and facilitate widening environmental application.
研究领域:
环境科学
·
材料科学
·
化学
·
光催化
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Zhenyu Yan,Wenyu Gao,Chenkai Zhong,Qiangqiang Jiao,Shujie Tian,Jia Liu
Ammonia (NH 3 ) plays an important role in agricultural production and is also an ideal zero-carbon energy source in sustainable hydrogen economy. Electrocatalytic nitrate (NO 3 - ) reduction reaction can simultaneously consume nitrogen pollutants in water during the synthesis of NH 3 , which is the most promising and gentle alternative process to the Haber-Bosch. However, due to the interference of hydrogen evolution reaction and high overpotential, the development of efficient directional ammonia conversion catalysts has become the key. In this study, Mo-Fe 2 O 3 material were fabricated by crystal face engineering and orbital manipulation strategies. The (001) face of α-Fe 2 O 3 with the best electrochemical performance was exposed by thermodynamic control, and the in-situ substitution of Mo single atoms for near-surface Fe atoms was further used to achieve excellent ammonia synthesis activity. NH 3 yield of 493.67 μg/h/mg cat and Faraday efficiency of 95.0% were achieved at -0.5 V vs. RHE (pH=7, 0.1 M PBS+500 ppm NO 3 - ). The mechanistic analysis showed that the highly electronegative Mo atoms induced strong interaction by Fe-O-Mo bond, which prompted Fe(III) to preferentially fill the lower t2g orbital and form a low-spin state. The weaker anti-bonding state enhances the interaction between Fe(III) and the coordinating O atoms in NO 3 - , thereby strengthening electron transfer. In summary, the targeted regulation of the crystal facet and electronic orbitals of catalysts presents a promising strategy for enhancing the conversion of NO 3 - to NH 3 .
研究领域:
材料科学
·
电化学
·
催化反应
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Shi-Wen Lv,Qiuyu Zheng,Lingjie Ye,Chun-Yang Li,Jing-Min Liu,Yanqing Cong,Shuo Wang
Nowadays, simultaneous removal of organic pollutants and heavy metals from wastewater is still a complicated task with great challenge. Herein, a newly-designed Fe-g-C 3 N 4 /α-Fe 2 O 3 composite with an active N-Fe-O bridge was prepared by coupling Fe-doped g-C 3 N 4 (namely Fe-g-C 3 N 4 ) and α-Fe 2 O 3 . Interestingly, the combination of Fe-g-C 3 N 4 with α-Fe 2 O 3 broadened the light absorption region and restrained the photoinduced electron-hole pair recombination. Meanwhile, elaborate construction of N-Fe-O bridges based on coordination interaction can reduce electrochemical impedance and facilitate electron transfer, thereby prolonging the charge lifetime. As expected, the Fe-g-C 3 N 4 /α-Fe 2 O 3 composite displayed excellent photocatalytic performance in simultaneous removal of tetracycline (TC) and Cr(VI). More importantly, Fe-g-C 3 N 4 /α-Fe 2 O 3 -mediated electron transfer from TC to Cr(VI) also played an essential role on TC oxidation and Cr(VI) reduction under visible light. Both experimental analyses and theoretical calculations revealed that the migration route of photogenerated carriers followed a direct Z-scheme heterojunction mechanism under built-in electric field. The Fe-g-C 3 N 4 /α-Fe 2 O 3 composite with great stability also displayed promising practical application potential. In short, the current work not only provided a highly-efficient photocatalyst with N-Fe-O bridges but also shared new insights into the simultaneous removal of organic pollutants and heavy metals.
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
Green Energy & Environment
·
2022
·
IF 12.781
Jiakai Li,Changpeng Lv,Jiajia Song,Xiaoling Zhang,Xizhen Huang,Yingzhuo Ma,Haijie Cao,Na Liu
Superwetting materials have drawn unprecedented attention in the treatment of oily wastewater due to their preferable anti-fouling property and selective oil/water separation. However, it is still a challenge to fabricate multifunctional and environmentally friendly materials, which can be stably applied to purify the actual complicated wastewater. Here, a Ag/α-Fe 2 O 3 heterostructure anchored copper mesh was intentionally synthesized using a facile two-step hydrothermal method. The resultant mesh with superhydrophilicity and underwater superoleophobicity was capable of separating various oil/water mixtures with superior separation efficiency and high permeation flux driven by gravity. Benefiting from the joint effects of the smaller band gap of Ag/α-Fe 2 O 3 heterojunction, inherent antibacterial capacity of α-Fe 2 O 3 and Ag nanoparticles, favorable conductive substrate, as well as the hierarchical structure with superwettability, such mesh presented remarkably enhanced degradation capability toward organic dyes under visible light irradiation and antibacterial activity against both Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) compared with the pure α-Fe 2 O 3 coated mesh. Impressively, the mesh exhibited bifunctional water purification performance, in which organic dyes were eliminated simultaneously from water during oil/water separation in one filtration process. More importantly, this mesh behaved exceptional chemical resistance, mechanical stability and long-term reusability. Therefore, this material with multifunctional integration may hold promising potential for steady water purification in practice.
研究领域:
环境科学
·
材料科学
·
化学
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
·
2023
·
IF 3.3
Xueying Wang,Qian Ma,Qi Zhang,Yi Wang,Lingyu Li,Dongheng Zhao,Zhiqiang Liu
Porous double-channel α-Fe 2 O 3 /SnO 2 heterostructures with tunable surface/interface transport mechanism have been originally fabricated by the electrospinning and subsequent calcination process. With the increase of Sn content from 0 to 5 mol%, the morphology of α-Fe 2 O 3 -based materials changed from porous fibers to ribbons with both sides curled inward. Double-channel structure can provide more active sites and enhanced adsorption capacity with the large specific surface areas of 233.2 m 2 /g. The optimal α-Fe 2 O 3 /SnO 2 composites exhibit the highest response value (32.38) and fastest response/recovery times (33/58 s) than those of other samples to 100 ppm N,N-dimethylformamide (DMF) at 360 °C. Meanwhile, good cycling and long-term stability and high gas selectivity of the composites are conductive to the feasible detection to DMF under high temperature (≥360 °C) condition. The enhanced gas-sensitive properties of α-Fe 2 O 3 /SnO 2 composites at high temperature are closely related to phase composition, unique morphology, efficient n-n heterojunction and accelerated surface/interface charge transfer process. Significantly, the porous double-channel α-Fe 2 O 3 /SnO 2 composite is expected to be a potential candidate for DMF vapor detection in the dye or pesticide industry to prevent DMF explosion under high temperature conditions in the future.
研究领域:
材料科学
·
传感技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Sensors
·
2025
·
IF 9.1
Xiao Ma,Rong Tan,Hong Chen,Jiawei Zhang,Lei Ge,Tingting Zhao,Xinyu Wang,Kaikai Yuan,Hairui Fang,Dong Wang
Nitrogen dioxide (NO2), the main component of pollutants in atmospheric environments, causes and exacerbates respiratory diseases, especially during outdoor sports even at the 100 ppb level. Currently, environmental gas detection still faces challenges such as high detection limits, low SNR, and low sensitivity. A NO2 sensor based on In(OH)3-α-Fe2O3–ZnO was prepared using a hydrothermal method, featuring an ultralow detection limit of 82 ppt, an exceptionally high SNR of 574,000, and an ultrahigh sensitivity of 252.25 mV/ppm (100 ppb to 1 ppm). And this sensor exhibits excellent response, selectivity, and repeatability. These excellent sensing characteristics come from the adsorbed oxygen on the surface of the material with the formation of n–n heterojunctions. Additionally, a low-power, portable, and cost-effective environmental monitoring system (named Smart Breath Sentinel (SBS)) was designed to intelligently upgrade ordinary masks. SBS enables real-time wireless environmental gas monitoring with integrated humidity compensation to ensure accurate measurements in high-humidity environments. SBS has already been tested in multiple environments, and the test results have proven the feasibility of SBS. This sensor based on In(OH)3-α-Fe2O3–ZnO demonstrates significant potential for applications aimed at enhancing human safety.
研究领域:
环境科学
·
材料科学
·
传感技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2019
·
IF 3.47
Adel Baimoldina,Konstantinos Papadikis,Elena Yu. Konysheva
The feasibility of α-Fe 2 O 3 catalyst addition in the in-situ catalytic fast pyrolysis of Pinewood was considered with the focus on the variation in its shape: nano-sized non-ideal spheres, nanotubes, hollow nano/microtubes, and octadecahedral crystals. Nano-sized spheres strongly promoted the formation of acetaldehyde, something that was also observed for the octadecahedral crystals. The formation of acids was primarily facilitated through the addition of nanotube catalysts and octadecahedral crystals. Newly formed alicyclic ketonic compounds were promoted through the addition of nano-sized spheres, hollow nano/microtubes, and octadecahedral crystals. The latter two catalysts also showed a moderate selectivity in the formation of furfural. All applied catalysts showed loss of activity, though at different degrees, on the formation of lignin derived phenolic compounds, which can be primarily attributed to favoring the formation of char with simultaneous release of CO 2 . All used α-Fe 2 O 3 catalysts with different shapes maintained their original morphology after the rapid heating with the rate of 20 K/ms followed by catalytic fast pyrolysis at 500 °C, indicating that nanomaterials with targeted dimensions can be applied as catalysts in the catalytic fast pyrolysis of biomass to enhance conversion of undesired oxygenated compounds to higher quality bio-oil and valuable chemicals.
研究领域:
催化
·
生物质能源
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Mengru Shi,Weijiang Tang,Sheng Guo,Fengxi Chen
Emerging antibiotic pollutants pose long-term risks to ecosystems and human health, necessitating the development of advanced elimination technologies. In this study, hierarchically porous α-Fe 2 O 3 nanosheets (α-Fe 2 O 3 -PNS) were prepared from an iron-polyvinylpyrrolidone (Fe-PVP) hybrid gel, where PVP served multiple functions, including iron immobilization, morphology template, pore formation, and crystallite growth regulation. As an efficient heterogeneous Fenton-like catalyst, α-Fe 2 O 3 -PNS achieved 93.6 % degradation of tetracycline (TC, 25 mg/L) within 2 h under mild conditions (25 °C, pH 5) using only 4 mM H 2 O 2 . The reaction followed pseudo-first-order kinetics with a high rate constant (0.0606 min −1 ) and an outstanding normalization factor (8.13). Key operational parameters (i.e., PVP dosage, catalyst loading, H 2 O 2 concentration, initial pH, coexisting anions and natural organic matter) were investigated. The material exhibited good reusability over five consecutive cycles and maintained robust performance in real water matrices. Its superior catalytic activity originated from exposed (113) crystal planes, abundant accessible iron sites, and rapid Fe 3+ /Fe 2+ redox cycling facilitated by the large surface area. Radical quenching tests and electron paramagnetic resonance spectroscopy confirmed that hydroxyl radicals, generated via surface Fe 2+ -mediated H 2 O 2 activation, are dominant reactive species, driving TC degradation through hydroxylation, oxidative cleavage, and ring-opening reactions. This study provides an energy- and resource-efficient solution for sustainable water remediation, operating effectively under ambient and circumneutral conditions with low H 2 O 2 consumption.
研究领域:
环境催化
·
材料科学
·
水处理技术
·
纳米材料化学
·
污染控制工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Hongjie Zhu,Zhihao Chen,Youyou Hu,Lingxuan Gong,Dandan Li,Zhengkui Li
The Z-scheme photocatalyst is valuable for use in polluted water purification. To improve the practical application value of the Z-scheme, in this study, a nano α-Fe 2 O 3 and P3HT composite photocatalyst array was synthesized by electrophoretic deposition for the first time. This material was named F1P. The EPR, VBXPS and in situ illumination XPS analyses indicated that the charge transfer path of F1P conforms to the Z-scheme, and F1P array has a high light energy conversion efficiency. Due to the advantages of the Z-scheme system and the good light harvesting ability, F1P exhibited a good degradation effect on different types of pollutants under visible light irradiation. The degradation efficiency of tetracycline and bisphenol A by F1P can reach 97 % and 99 %, respectively. Moreover, F1P showed a certain resistance to water quality changes. After four cycles, F1P can maintain the structural stability and good pollutant treatment effect. Due to the high redox ability of F1P, the complex structure of pollutants can be destroyed and the degradation path of pollutants in F1P system was also analyzed. This study provides a new way of synthesizing Z-scheme systems and immobilizing Z-scheme photocatalysts. F1P is a new material with high practicability.
研究领域:
环境科学
·
材料科学
·
化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2016
·Vol. 184
·期 1
·137-145
·
IF 4.831
Dai Liming,Du Xiaojiao,Jiang Ding,Chen Wei,Zhu Mingyue,Wang Kun
The authors have coupled ultrafine α-Fe 2 O 3 nanocrystals to N-doped graphene (NG) to obtain a novel material for use in a photoelectrode. The presence of NG is shown to strongly affect the morphology and size of the α-Fe 2 O 3 nanocrystals formed on the NG sheets, and to improve their photoelectrochemical (PEC) activity. Interestingly, the PEC performance of the nanocomposite is closely correlated to the size of the α-Fe 2 O 3 nanocrystals in that small nanocrystals display better PEC properties. The photocurrent of α-Fe 2 O 3 -NG is nearly 3.3-fold stronger than that of α-Fe 2 O 3 nanocrystals. Based on the remarkable PEC performance of this nanocomposite, a PEC sensor was constructed for the sensitive determination of 1,4-dihydroxybenzene (HQ). Its photocurrent increases with the HQ concentration in the range from 3.0 nM to 3.3 μM, and the detection limit is 1.0 nM (at an S/N ratio of 3). In our perception, the study presented here can serve as a basis for a better understanding of the relationship between morphologies and PEC performance of such nanomaterials. Conceivably, it may be extended to other PEC sensing system and to other fields associated with nanotechnology.
Ultrafine α-Fe 2 O 3 nanocrystals were prepared via coupling with N-doped graphene (NG) substances (α-Fe 2 O 3 -NG). They exhibit superior photoelectrochemical (PEC) performance and have been successfully utilized for PEC-based sensing.
研究领域:
材料科学
·
分析化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MEASUREMENT SCIENCE and TECHNOLOGY
·
2021
·Vol. 33
·期 3
·035102
·
IF 2.046
Sijie He,Yushan Liu,Wenlin Feng,Bangxing Li,Xiaozhan Yang,Xinyue Huang
A carbon monoxide (CO) sensor based on a Michelson interferometer combined with α-Fe2O3/reduced graphene oxide quantum dots (rGOQDs) composite film is proposed and fabricated. First, a waist-enlarged taper is formed between the single-mode fiber (SMF) and the no-core fiber (NCF), then the other end of the NCF is spliced with a section of thin-core fiber (TCF). The end of the TCF is coated with a layer of silver film to enhance the reflection. Thus, a Michelson interferometer comprising SMF–NCF–TCF is formed. The α-Fe2O3/rGOQDs composite film is deposited on the outside surface of the TCF. The specific adsorption of CO by the composite film leads to a change in the sensor's effective refractive index, realizing the detection of CO. The results show that the interference intensity of the monitoring valley decreases with increase in the concentration of CO. The sensitivity of the sensor is 0.057 dBm ppm−1, the detection limit of the sensor is 105 ppb and the response time and recovery time are 70 s and 100 s, respectively. The sensor has the advantages of high sensitivity, high selectivity and simple structure, and it is expected to be used for the detection of low concentrations of CO gas.
研究领域:
光学
·
材料科学
·
传感器
·
气体检测
✓ 已验证
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2015
·
IF 6.409
Biyan Xu,Delun Zheng,Weiwei Qiu,Feng Gao,Shaoxiong Jiang,Qingxiang Wang
In this work, a novel electrochemical DNA biosensor has been developed based on the hybrid film of fern leaf-like α-Fe 2 O 3 microparticles and chitosan (CS). The fern leaf-like α-Fe 2 O 3 microparticles were synthesized via a facile template-free hydrothermal method, and their morphologies were characterized by X-ray diffraction, energy dispersive spectrometry, scanning electron microscope, and transmission electron microscope. Electrochemical characterization assays revealed that the hybrid film modified electrode had remarkable synergistic effects of the large accessible surface area and high electrical conductivity of semiconductive Fe 2 O 3 , and the good film stability of CS. Based on the rich amino groups on CS, the CS–Fe 2 O 3 hybrid film was employed as a functional matrix for probe DNA immobilization using terephthalaldehyde (TPA) as a bifunctional arm-linker. The hybridization capacity of the developed biosensor was evaluated with electrochemical impedance spectroscopy (EIS) using [Fe(CN) 6 ] 3−/4− as the indicating probe. A wide dynamic detection range from 1.0×10 −14 to 1.0×10 −10 M with ultralow detection limit of 5.6×10 −15 M was achieved for the target DNA. The hybridization selectivity experiments further revealed that the biosensor could discriminate fully complementary sequences from one-base mismatched, three-base mismatched, and non-complementary sequences. Moreover, the biosensor showed the advantage of good regeneration ability and reproducibility.
研究领域:
生物化学
·
电化学
·
纳米技术
·
生物传感器
·
材料科学
✓ 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）