JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2018
·Vol. 133
·期 2
·859-867
·
IF 2.209
He Yu,Zhang Nan,Yuan Yanping,Cao Xiaoling,Sun Liangliang,Song Yanlin
In this study, iron oxide nanoparticles (α-Fe 2 O 3 ) have been firstly used as a nucleating agent, which simultaneously reduces the supercooling degree of sodium acetate trihydrate (SAT) and improves its thermal conductivity. A series of SAT composite phase change materials (PCMs) for potential latent heat thermal energy storage applications were prepared by a ball milling method using carboxymethyl cellulose as a thickening agent and sodium dodecyl sulfonate as a dispersant. In order to investigate the effect of the mass ratio of α-Fe 2 O 3 nanoparticles on the supercooling degree of SAT, various α-Fe 2 O 3 contents (0.2, 0.4, 0.6, 0.8, and 1.0 mass%) were added into the SAT matrix. It was found that the supercooling degree of the SAT composite PCM was reduced to 0 °C at a α-Fe 2 O 3 content of 0.8 mass%. Furthermore, no chemical reaction between SAT and α-Fe 2 O 3 occurred, and the presence of α-Fe 2 O 3 had no effect on the energy storage capability of SAT. The thermal conductivity of the SAT composite PCM was improved by 22.5% due to the addition of 0.8 mass% α-Fe 2 O 3 . After 60 melting–freezing cycles, the composite PCMs retained excellent stability with a small reduction in the phase change temperature (0.33 °C) and low latent heat loss rate (0.796%).
研究领域:
材料科学
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热能储存
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Chunmei Li,Sainan Ma,Ming Zhao,Maoxiang Jing,Weiyong Yuan,Changming Li
Hematite (α-Fe2O3) core–cocatalyst shell nanoarchitectures with ultrathin hybrid shells are promising to maximize photoelectrochemical (PEC) water oxidation performance of Fe2O3-based photoelectrodes, but their fabrication presents formidable challenges. For the first time, a wormlike nanostructured α-Fe2O3@Co3O4/graphene quantum dot (GQD) core–hybrid shell nanoarray is synthesized via self-assembly, showing an onset potential of 0.63 V (vs the reversible hydrogen electrode (RHE)) and a photocurrent density of 3.63 mA cm–2 at 1.23 V (vs RHE). This performance is superior to those of reported Fe2O3-based heterojunction photoanodes and among the best reported for Fe2O3-based photoanodes. The outstanding performance is due to the Co3O4/GQD shell significantly promoting charge separation and transfer and hole injection as well as great synergistic effects between GQDs and Co3O4. This work not only fabricates a low-cost photoanode with record-high water oxidation performance and offers scientific insights into the enhancement mechanism but also provides a facile, economical, and universal strategy to self-assemble conformal, ultrathin hybrid shells on three-dimensional (3-D) complex nanostructures, which have broad applications in the fields of energy, environment, and sensing.
研究领域:
材料科学
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纳米技术
·
光电化学
·
能源材料
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Yaqiao Liu,Shuozhen Hu,Zhaoqun Gao,Xinsheng Zhang,Shigang Sun
Photoelectrochemical (PEC) water oxidation is considered to be a promising approach to converting solar energy into clean chemical fuels. α-Fe2O3 is a potential photoanode material for water oxidation with a high theoretical photocurrent density (12.6 mA cm–2) driven by visible light. Constructing α-Fe2O3-based heterojunction with other semiconductors is a promising strategy to improve the actual photoelectrocatalytic activity. In this work, nitrogen-doped Ta2O5 is introduced to synthesize N-Ta2O5-h@α-Fe2O3 nanorod heterojunction with different band structures. At the interface, electrons transfer from N-Ta2O5-h to α-Fe2O3, which forms a built-in electric field. The heterojunction structure contributes to inhibiting the severe recombination of photogenerated electron–hole pairs. By controlling the duration of mild heat treatment, the N-Ta2O5-h nanorods with different Fermi energy levels and contents of oxygen vacancies are obtained. A mild heat treatment in N2 is proved to enlarge the ΔE by leveling up the Fermi level and to promote the content of oxygen vacancies for the N-Ta2O5-h@α-Fe2O3 heterojunction as the heat-treatment time increases. The PEC water oxidation performance of the N-Ta2O5-h@α-Fe2O3 heterojunction increases when the mild-heat-treatment time is 2 h and decreases for 6 h treatment. Eventually, N-Ta2O5-2@α-Fe2O3 exhibits an enhanced photocurrent density of 3.10 mA cm–2 (4.4 times higher than that of bare α-Fe2O3), an efficiently boosted charge separation (2.0 times higher than bare α-Fe2O3), and a high chemical stability after a long-term test.
研究领域:
光电化学
·
材料科学
·
能量转换
·
催化
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Keheng Zhu,Zhenhua Zhu,Shanshan Xu,Cheng Zhao,Tianjun Ni
Trimethylamine (TMA) is an organic amine with strong pungent smell which is an indicator gas for evaluating fish freshness according to the international standard. In this work, as-synthesize α-Fe 2 O 3 solid nanocubes (NCs), α-Fe 2 O 3 nucleoshell NCs and α-Fe 2 O 3 hollow NCs were used as sensing material to develop an outstanding TMA gas sensor. The response of the α-Fe 2 O 3 hollow NCs sensors towards 20 ppm TMA at 230 ℃ was 6.3. Meanwhile, these sensors showed exceptional response/recovery time, low limit of detection, great selectivity, and outstanding linear relationship. Furthermore, the analysis of gases released during the decomposition of Carassius auratus (0–10 days) was conducted, which demonstrated the assessment of TMA by α-Fe 2 O 3 hollow NCs sensor can evaluate the freshness of Carassius auratus . Such a novel sensor signifies the outstanding application potential in efficient gas-sensing properties of TMA, which will make the tremendous contribution for Carassius auratus product evaluation in the future.
研究领域:
材料科学
·
食品科学
·
环境监测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Meng Li,Shaoqi Zhou
Microbial fuel cell (MFC) as a promising technology, which can be used to remove pollutant and generate bioelectricity simultaneously. In this study, the carbon cloth modified with α-Fe 2 O 3 /polyaniline nanocomposites is used as cathode in a dual chamber MFC for the generation of bioelectricity and electrochemical reduction of hexavalent chromium (Cr(VI)). The carbon cloth decorated with nanocomposites is prepared by a facile electrochemical polymerization technique. The MFC exhibits a complete Cr(VI) reduction at 50 mg·L −1 within 36 h, acquiring the obviously high Cr(VI) reduction rate of 1.39 g·m −3 ·h −1 , and the reduction rate is 1.67 times as high as that of the MFC-Blank (0.83 g·m −3 ·h −1 ). The MFC with α-Fe 2 O 3 /polyaniline nanocomposites cathode improves the Cr(VI) reduction rate and output power in MFC. And the maximum power density of this MFC is 1502.78 mW·m −2 , which is 1.753 times as high as that of the blank cathode. The improvement is due to the strong conductivity, high mobility of charge carriers and excellent electrochemical performance of nanocomposites. Besides, the power density of MFC modified with α-Fe 2 O 3 /polyaniline cathode has merely a slight decrease (2.23%) during fifty cycle operation due to the formation of protection layer. Consequently, the carbon cloth attached with α-Fe 2 O 3 /polyaniline nanocomposites with excellent electrochemical performance can be used as a promising cathode for Cr(VI) reduction and bioelectricity generation simultaneously.
研究领域:
环境科学
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材料科学
·
微生物学
✓ 已验证
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Jingtao Wu,Xiaodong Yue,Tianyu Wang,Yafeng Zhang,Yuan Jin,Guangli Li
Excessive intake of baicalein (BA) may lead to many adverse heathy risks. Hence, it is highly desirable to develop a convenient and sensitive method for the determination of BA. Herein, a low-cost and highly sensitive electrochemical sensor was fabricated for determination of BA in herbal medicine based on shuttle-shape α-Fe 2 O 3 nanoparticles decorated multiwalled carbon nanotubes (s-Fe 2 O 3 /MWCNTs). Various microscopic and spectroscopic methods confirmed the successful formation of s-Fe 2 O 3 /MWCNTs. CV and EIS techniques revealed that the s-Fe 2 O 3 /MWCNTs significantly improved the electroactive surface area and electron transport ability. Owing to the synergistic interactions between s-Fe 2 O 3 NPs and MWCNTs, the s-Fe 2 O 3 /MWCNTs exhibited superior electrocatalytic toward BA oxidation through a two electrons two protons pathway. Under optimal experimental conditions (accumulation potential of 0 V, accumulation time of 120 s, and pH of 6.0), The s-Fe 2 O 3 /MWCNT/GCE displayed a wide detection range from 0.001 to 10 μM with an ultrahigh sensitivity (6.154 μA μM −1 ) and extremely low limit of detection (0.2 nM). The s-Fe 2 O 3 /MWCNTs demonstrated strong anti-interfering ability against common potential interfering substances even at high concentration, and maintained stable peak current responses for at least 2 weeks. Furthermore, the s-Fe 2 O 3 /MWCNTs achieved the reliable detection of BA in traditional herbal medicine with satisfactory recovery (97 − 105 %). Considering their low cost, convenient operation, and comprehensive sensing performance, the s-Fe 2 O 3 /MWCNTs have demonstrated promising application prospects in sensitive detection of flavonoids.
研究领域:
分析化学
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药物分析
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Bioengineering and Biotechnology
·
2024
·
IF 4.3
Feng Kai,Di Ya,Han Meng,Yan Weitao,Guo Yulin,Huai Xiangqian,Wang Yimin
A novel photoelectrochemical (PEC) aptasensor based on a dual Z-scheme α-Fe2O3/MoS2/Bi2S3 ternary heterojunction for the ultrasensitive detection of circulating tumor cells (CTCs) was developed. The α-Fe2O3/MoS2/Bi2S3 nanocomposite was prepared via a step-by-step route, and the photoproduced electron/hole transfer path was speculated by conducting trapping experiments of reactive species. α-Fe2O3/MoS2/Bi2S3-modified electrodes exhibited greatly enhanced photocurrent under visible light due to the double Z-scheme charge transfer process, which met the requirement of the PEC sensor for detecting larger targets. After the aptamer was conjugated on the photoelectrode through chitosan (CS) and glutaraldehyde (GA), when MCF-7 cells were presented and captured, the photocurrent of the PEC biosensing system decreased due to steric hindrance. The current intensity had a linear relationship with the logarithm of MCF-7 cell concentration ranging from 10 to 1×105 cells mL−1, with a low detection limit of 3 cell mL−1 (S/N = 3). The dual Z-scheme α-Fe2O3/MoS2/Bi2S3 ternary heterojunction-modified PEC aptasensor exhibited high sensitivity and excellent specificity and stability. Additionally, MCF-7 cells in human serum were determined by this PEC aptasensor, exhibiting great potential as a promising tool for clinical detection.
研究领域:
生物医学工程
·
癌症诊断
·
纳米材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 32
·10558-10563
·
IF 4.029
Dejian Yan,Jikai Liu,Zhichao Shang,He'an Luo
Ti-doped α-Fe2O3 nanorods (NRs) with carbon layer coating were fabricated for photoelectrochemical (PEC) water oxidation. The α-Fe2O3 NRs were grown on the surface of a Ti foil substrate by hydrothermal synthesis. Ti4+ was diffused from the Ti substrate and doped into the α-Fe2O3 NRs by sintering at 800 °C. The presence of Fe2+ in the α-Fe2O3 lattice was achieved by annealing the NRs in a lack of oxygen atmosphere, e.g. in argon. The co-existence of Ti4+ and Fe2+ results in significant enhancement of the PEC performance compared with the hematite NRs obtained by annealing in air, showing the absence of Fe2+. The carbon layer coating was conducted by the carbonization of glucose. Impressively, the coated carbon layer can not only facilitate the charge transfer of the photogenerated carriers but also effectively restrain the structural aggregation of the NRs upon high temperature sintering. The carbon layer coated NRs exhibited 1.2 times higher photocurrent density than the uncoated NRs due to the reduced charge recombination and well-distinct NR structures.
研究领域:
材料科学
·
光电化学
·
纳米技术
·
能源材料
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Lifang Pan,Shihai Cao,Rui Liu,Huan Chen,Fang Jiang,Xin Wang
Aldehyde-functionalized α-Fe 2 O 3 /graphitic carbon nitride (α-Fe 2 O 3 -DBD/g-C 3 N 4 ) was successfully synthesized through Schiff-based reaction between aromatic aldehydes in 3,4-dihydroxybenzaldehyde and NH 2 groups in urea. The 3,4-dihydroxybenzaldehyde around α-Fe 2 O 3 were advantageous to in situ growth of graphitic carbon nitride on α-Fe 2 O 3 to form the contact interface by chemical bonds and beneficial to the electron transfer , leading to the formation of Z-scheme photocatalytic system. The α-Fe 2 O 3 -DBD/g-C 3 N 4 photocatalysts exhibited a remarkable improvement in the degradation of bisphenol A (BPA) compared with bulk g-C 3 N 4 . The enhanced photocatalytic activity was attributed to the enhanced charge separation efficiency and higher redox potential . This study presents a simple and efficient method to construct all-solid-state Z-scheme photocatalytic system with the formation of tight contact interface and nonmetal materials (aromatic rings) as electron mediators for the removal of complex pollutants.
研究领域:
材料科学
·
环境科学
·
光催化技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS ES&T Engineering
·
2023
·
IF 7.1
Wei-Ping Zhu,Jie Deng,Zhi-Jie Chen,Jia-Cheng Li,Juan Xu
The performance of three-dimensional biofilm electrode reactors (3D-BERs) in hydrogen autotrophic denitrification is determined by electroactive biofilms. Herein, a self-assembled hybrid biofilm (SAHB) is developed on granular activated carbon particle electrodes by incorporating nano α-Fe2O3. The influences of operating parameters such as current, influent concentration, and hydraulic retention time (HRT) on denitrification are investigated as well as the mechanisms of SAHB-improved denitrification. The results indicate that SAHB achieves a high autotrophic denitrification rate of 4.20 mg TN/L/h under 40 mA current, 100 mg/L nitrate, and 26 h HRT, outperforming the naturally formed biofilm by 23.53%. SAHB contains more microorganisms than naturally formed biofilms, revealing that nano α-Fe2O3 is conducive to trapping free microorganisms on particle electrodes. SAHB enriches denitrification-related genes and increases corresponding enzyme activities (particularly nitrite reductase). According to metagenomic sequencing, nano α-Fe2O3 addition at a current level of 40 mA appears to favor denitrification via the nirS-dependent pathway probably due to its high affinity for cytochrome C. Metagenomic binning reveals that the microorganism associated with Zoogloeaceae (Rhodocyclales order) in SAHB may play a pivotal role in hydrogen autotrophic denitrification. This work develops a novel denitrification system, furthering our understanding of hydrogen autotrophic denitrification in 3D-BERs.
研究领域:
环境科学
·
微生物学
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Shuai Wang,Changhao Yao,Yifeng Cai,Yang Yang,Huiyuan Ma,Baojiang Jiang,Jun Ma
In this study, α-Fe 2 O 3 /rGO was smoothly synthesized by a one-step method and employed to activate persulfate (PS) for the degradation of Bisphenol A (BPA) under sunlight. During the degradation experiment, the degradation rates of BPA for PS, α-Fe 2 O 3 /8% rGO, and α-Fe 2 O 3 /8% rGO/PS were 6.6%, 47.6%, and 99.1%, respectively, indicating that the introduction of α-Fe 2 O 3 /rGO and PS significantly enhanced the photocatalytic efficiency because that photocatalytic process and PS activation coupling system not only inhibited the recombination of photo-induced carrier pairs, but also reduced the energy consumption of PS activation. Moreover, electron spin resonance spectroscopy (ESR) and trapping experiments were utilized to explore the active species generated during the reaction. The results showed that •OH and •SO 4 2- were the principal oxidative species in this reaction system. These results showed that Fe-loaded rGO has great potential for activating PS to decompose pollutants in water.
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
危险品化学品经营许可证（带存储）