ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Jiabin Shen,Shanshan Xu,Cheng Zhao,Xiaopeng Qiao,Haiquan Liu,Yong Zhao,Jing Wei,Yongheng Zhu
In this work, we present a new metal oxide semiconductor gas sensor for detecting trimethylamine (TMA) by bimetal Au@Pt-modified α-Fe2O3 hollow nanocubes (NCs) as sensing materials. The structure and morphological characteristics of Au@Pt/α-Fe2O3 were evaluated through multiple analyses, and their gas-sensitive performance was investigated. Compared with the pristine α-Fe2O3 NC sensor, the sensor based on Au@Pt/α-Fe2O3 NCs exhibited faster response time (5 s) and higher response (Ra/Rg = 32) toward 100 ppm TMA gas at a lower temperature (150 °C). Furthermore, we also assessed the Au@Pt/α-Fe2O3 NC sensor for detecting the freshness of Larimichthys crocea which have been observed by headspace solid-phase microextraction and gas chromatography–mass spectrometry. The high performance of the Au@Pt/α-Fe2O3 NCs is attributed to the special hollow morphology with a high specific surface area (212.9 m2/g) and the synergistic effect of the Au@Pt bimetal. The Au@Pt/α-Fe2O3 sensor shows promising application prospects in estimating seafood freshness on the spot.
研究领域:
材料科学
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食品科学
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Xianjiu Liao,Jianjun Luo,Jing Wu,Taotao Fan,Yao Yao,Fenglei Gao,Yong Qian
In this work, a sensitive DNAzyme-based electrochemical sensor had been developed for Pb 2+ detection with platinum nanoparticles decorated TiO 2 /α-Fe 2 O 3 composite as signal labels. The morphological and compositional properties of the PtNPs/TiO 2 /α-Fe 2 O 3 were examined by using transmission electron microscopy , X-ray diffraction, and X-ray photoelectron spectroscopy. The result showed that the shape of α-Fe 2 O 3 nanocrystals were the cubic, the average length ranged from 150 to 300 nm, and the PtNPs with about 3–4 nm in diameter were well dispersed on the surface of TiO 2 /α-Fe 2 O 3 . TiO 2 /α-Fe 2 O 3 were used as a “carrier” to load the PtNPs tracers as well as for Apt3 immobilization. In turn, the DNAzyme structure of Apt1 and Apt2 was immobilized on the gold electrode surface as the capture probes. Subsequently, DNAzyme modified electrodes reacted with target Pb 2+ and the Apt3/PtNPs/TiO 2 /α-Fe 2 O 3 composite were deposited on the electrode surface. The performance of the DNAzyme-based electrochemical sensor was tested by recording the electrocatalytic reduction current toward H 2 O 2 . Enhanced sensitivity was achieved by TiO 2 /α-Fe 2 O 3 nanocomposites as a nanocarrier in order to PtNPs at a high ratio. The DNAzyme-based electrochemical sensor described here exhibited excellent sensitivity and specificity for target ion. This work represented a promising potential for on-site testing Pb 2+ in real drinking water and serum sample analysis.
研究领域:
生物传感技术
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纳米材料科学
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Wisal Muhammad,Nazma Faqir,Muhammad Asif Khan,Zaheen Ullah Khan,Bilal Ahmad,Muhammad Jawad Ahmad,Amir Zada,Fawad Ali,Sajid Nadeem,Muhammad Zaka Ansar,Wajid Ali
Developing an efficient visible-light-driven photocatalysts for conversion of atmospheric CO 2 into valuable fuels is a promising strategy to mitigate the escalating greenhouse gas, environmental, and energy crisis. This study presents an innovative design for a cascade Z-scheme comprising of dimensional matched SnO 2 -α-Fe 2 O 3 /g-C 3 N 4 (SO-FO/CN) nanosheets heterojunction. In this configuration, SnO 2 functions as an optimal energy platform that not only facilitates charge transfer and separation but also sustains sufficient thermodynamic energy for redox reactions and inhibits the undesired type-II charge transfer pathway. The optimized cascade Z-scheme exhibits a remarkable 20-fold improved photoactivity for CO 2 conversion to CH 4 and CO compared to bare g-C 3 N 4 (CN). It also shows significantly improved photocatalytic activity for the degradation of toxic organic pollutants, 2,4-dichlorophenol (2,4-DCP) ∼6.6-fold and bisphenol A (BPA) ∼4.2-fold, respectively. The improved photocatalytic activity results from effective charge separation facilitated by the Z-scheme, along with a favorable energy platform and extended charge lifetime. This innovative strategy, which utilize an energy platform, presents a promising approach for designing an efficient Z-scheme heterojunction photocatalysts for solar-to-fuel conversion and pollutant degradation.
研究领域:
材料科学
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环境科学
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能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yingjie Guo,Jiayi Yan,Zan Chen,Cuijia Duan,Claudia Li,Yinhui Li,Sibudjing Kawi
The tendency of small-sized covalent organic framework (COF) nanoparticles to easily agglomerate, and the propensity of photo-generated carriers in α -Fe 2 O 3 to recombine pose challenges in the efficient removal of tetracycline (TC) through adsorption-photocatalysis synergy. This study addresses these challenges by introducing MIL-101, known for its excellent chemical stability and large specific surface area. The amino functional group facilitates the in-situ growth of acyl chloride-covalent organic framework (AC-COF) on the surface of MIL-101, resulting in the fabrication of AC-COF@MIL-101 with a core-shell structure. Loading α -Fe 2 O 3 through structural regulation leads to the preparation of the final α -Fe 2 O 3 /AC-COF@MIL-101 ternary nanocomposite. In α -Fe 2 O 3 /AC-COF@MIL-101 composites, the high surface energy of AC-COF is mitigated by the strong chemical energy of N C-N, reducing AC-COF aggregation and decreasing the recombination rate of photogenerated carriers in α -Fe 2 O 3 . The heterojunction structure between AC-COF@MIL-101 and α -Fe 2 O 3 enhances the degradation of TC, attributed to the synergistic effect of adsorption and photocatalysis. Experimental results demonstrate that α -Fe 2 O 3 /AC-COF@MIL-101 has a maximum adsorption capacity of 135.14 mg/g, achieving a 100% TC removal rate within 30 min. Compared to AC-COF, MIL-101, and α -Fe 2 O 3 , α -Fe 2 O 3 /AC-COF@MIL-101 exhibits higher adsorption capacity and photocatalytic activity. Specifically, its adsorption capacity is 2.1 times that of AC-COF, 1.8 times that of MIL-101, and 10.6 times that of α -Fe 2 O 3 . Additionally, its degradation ability is 8.6 times that of α -Fe 2 O 3 . The adsorption of TC by α -Fe 2 O 3 /AC-COF@MIL-101 occurs through monolayer chemical adsorption, and the process is exothermic. The main active species involved in the photocatalytic degradation process are h + and ·OH. This study introduces a new ternary composite multifunctional material with high adsorption and photocatalytic performance for TC, offering a potential strategy for enhancing the synergistically adsorption-photocatalytic effect in ternary composite systems.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 33
·期 9
·095601
·
IF 3.874
Lulu Yu,Min Liu,Yanling Zhang,Yun Ni,Shaobo Wu,Ruijiang Liu
A magnetically induced self-assembly DNAzyme electrochemical biosensor based on gold-modified α-Fe2O3/Fe3O4 heterogeneous nanoparticles was successfully fabricated to detect Nickel(II) (Ni2+). The phase composition and magnetic properties of α-Fe2O3/Fe3O4 heterogeneous nanoparticles controllably prepared by the citric acid (CA) sol–gel method were investigated in detail. The α-Fe2O3/Fe3O4 heterogeneous nanoparticles were modified by using trisodium citrate as reducing agent, and the magnetically induced self-assembly α-Fe2O3/Fe3O4–Au nanocomposites were obtained. The designed Ni2+-dependent DNAzyme consisted of the catalytic chain modified with the thiol group (S1-SH) and the substrate chain modified with methylene blue (S2-MB). The MGCE/α-Fe2O3/Fe3O4–Au/S1/BSA/S2 electrochemical sensing platform was constructed and differential pulse voltammetry was applied for electrochemical detection. Under the optimum experimental parameters, the detection range of the biosensor was 100 pM–10 μM (R2 = 0.9978) with the limit of detection of 55 pM. The biosensor had high selectivity, acceptable stability, and reproducibility (RSD = 4.03%).
研究领域:
生物化学
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纳米技术
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xufei Li,Yanling Qiu,Zhiliang Zhu,Ting Chen,Hua Zhang,Daqiang Yin
Insufficient photocatalytic activity and poor recyclability are considered as two main factors that limit the further application of photocatalysts in environmental remediation. Herein, a new magnetic g-C 3 N 4 /α-Fe 2 O 3 /Bi 3 TaO 7 (CN/FO/BTO) heterojunction with dual Z-scheme system was first synthesized via an ultrasound-assisted calcination process. The results showed that the removal efficiency of ciprofloxacin (CIP) by optimized CN/FO/BTO heterojunction could reach 95.6% within 120 min illumination of visible light, which was 6.1, 15.9, 5.2, 3.7 and 2.3 times as much as that of single CN, FO, BTO, binary CN/FO and CN/BTO, respectively. Characterization analysis indicated that the improved photocatalytic activity derived from the synergistic effects of the three components, including the dispersion of FO and BTO by CN sheet, the enhanced light absorption of CN by addition of FO and BTO, and the reduced photogenerated charge recombination by their intimate contact. Further mechanism study revealed that the dual Z-scheme system of CN/FO/BTO leaded to efficient photoexcited carrier separation and strong redox capacity, in which •O 2 – and •OH were main radicals during photocatalytic process. Meanwhile, CN/FO/BTO possessed supreme adaptability to pH as well as co-existing matters, favorable magnetic separation property and excellent stability, making it a potential candidate for environmental remediation applications.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Lili Bo,Fang Nian,Lumei Pu,Ping Li,Yusen Hu,Jinhui Tong
Hybrids of α-Fe 2 O 3 /Fe 3 O 4 nanoparticles embedded in N doped graphitic carbon polyhedron layered arrays (FeO x /NCLA) were simply constructed by pyrolyzing the composite precursor of NH 2 -MIL-101(Fe) (a metal organic framework, MOF) and glycylglycine. The experimental and calculated results reveal that the obtained catalysts exhibited multiple active components, synergistic heterojunction effect, high BET surface areas and conductivity, and consequently greatly improved intrinsic electrocatalytic activities and kinetics for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). As the results, the optimized catalyst FeO x /NCLA-1.2 exhibited positive half-wave potential of 0.846 V for ORR and only 218 mV of overpotential (at 10 mA/cm 2 ) for OER in alkaline electrolyte, which is superior than Pt/C (20 %) and RuO 2 , respectively. The Zn-air battery (ZAB) employing the FeO x /NCLA-1.2 as electrocatalyst obtained a peak power density of 104.3 mW·cm −2 , a specific capacity of 840 mAh·g Zn -1 and an energy density of 890 Wh·kg Zn -1 , which is also much higher than that for the noble metal based one. The catalyst is promised to be applied in water electrolysis, fuel cells and metal-air batteries.
研究领域:
材料科学
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电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
Physica Status Solidi-Rapid Research Letters
·
2023
·Vol. 18
·期 7
·2300102
·
IF 2.8
Wenlong Chu,Ruifeng Xin,Luwei Zou,Xiulian Fan,Xilong Zhou,Cheng Li,Yu Zhou
2D nonlayered materials have attracted more and more attention due to their novel properties and special surface structures. However, due to isotropic chemical bonds within the crystal, the synthesis of ultrathin 2D nonlayered materials is an urgent challenge. Herein, α -Fe 2 O 3 2D nanosheets as thin as ≈8.2 nm on different substrates using self-designed ultralow concentration precursors combined with Gibbs free energy and Se catalysts design are successfully synthesized. The thickness-dependent growth mechanism is systematically studied, demonstrating the thermodynamic and kinetic controlling factors. The as-grown α -Fe 2 O 3 nanosheets are demonstrated with single-crystal structures without any other elements doping. The α -Fe 2 O 3 nanosheets photodetectors show the reasonable response performance with the positive photoconductive mechanism. This improved chemical vapor deposition method provides a promising idea for the synthesis of ultrathin 2D nonlayered materials.
研究领域:
材料科学
·
纳米科技
·
表面科学
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凝聚态物理
·
光电子学
✓ 已验证
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2019
·
IF 6.864
Jiangtao Xu,Songmin Shang,Shouxiang Jiang
Conventionally, the surface-enhanced Raman spectroscopy (SERS) measurement is performed by dispersing noble metal nanoparticles onto the target sample directly or assembling noble metal nanoparticles onto a micro-sized substrate. Despite it is flourishing, this method is not adequate for various samples, mainly limited by either a defined confinement of the test position or the complex extraction process of the target sample on the irregularly shaped surface, besides the costive materials, complex and uncontrollable fabricating processes. Herein, we demonstrate that the α-Fe 2 O 3 thin film is decorated with Ag nanoparticles constructed on SiO 2 fibers as a flexible SERS-active substrate, which yields a functional optical enhancement of the signal at 532 nm laser excitation . It shows a high enhancement factor of 4.71 × 10 5 , ultrahigh sensitivity of 10 −15 M, and excellent signal stability with a relative standard deviation (RSD) of 1.22% and reproducibility with a RSD of 0.258%.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Wenjing Pan,Yong Zhang,Sujing Yu,Xiaohua Liu,Dongzhi Zhang
The metal-organic framework (MOF)-derived alpha-iron oxide hollow nanosphere/molybdenum diselenide nanoflower (α-Fe 2 O 3 /MoSe 2 ) composite is fabricated via simple hydrothermal route. Multiple characterization methods have proved the successful synthesis of α-Fe 2 O 3 /MoSe 2 composites. The nanocomposite with a mass ratio of α-Fe 2 O 3 and MoSe 2 of 4:1 shows high response to H 2 S gas sensing. Moreover, the gas sensitivity test of the system shows that the α-Fe 2 O 3 /MoSe 2 composite sensor exhibits a faster response/recovery rate, outstanding repeatability and anti-humidity interference toward H 2 S sensing at room temperature, which also shows excellent selectivity for H 2 S compared to various potentially interfering gases. Further studies have shown that α-Fe 2 O 3 /MoSe 2 nanocomposites have improved H 2 S gas sensing performance due to the increased active sites and specific surface area, and the formation of n-n heterojunctions at the interface between α-Fe 2 O 3 hollow nanospheres and MoSe 2 nanoflowers.
研究领域:
材料科学
·
化学传感器
·
纳米技术
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Fu Yang,Liuzhu Zhou,Xuexue Dong,Wanyu Zhang,Shuying Gao,Xuyu Wang,Lulu Li,Chao Yu,Qian Wang,Aihua Yuan,Jin Chen
Visible-light-driven environmental contaminants control using 2D photocatalytic nanomaterials with an unconfined reaction–diffusion path is advantageous for public health. Here, cost-effective siliceous composite microsheets (FeSiO-MS) combined with two distinct refined α-Fe2O3 nanospecies as photofunctional catalysts were constructed via a one-pot synthesis approach. Through precise control of Fe2+ precursor addition, specially configured α-Fe2O3 nanofibers combined with FeOx cluster-functionalized siliceous microsheets of ∼15 nm gradually evolved from the iron oxide-bearing molecular sieve, endowing a superior light-response characteristic of the formed nanocomposite. The catalytic experiment along with the ESR study demonstrated that the produced FeSiO-MS showed reinforced photo-Fenton reactivity, which was effective for rapid phenol degradation under visible light radiation. Moreover, the phenol removal process was found to be regulated by the specially configured types and concentrations of iron oxides. Notably, the obtained composites exhibited a considerable visible-light-induced bactericidal effect against E. coli. The constructed FeSiO-MS nanocomposites as integrated and eco-friendly photocatalysts exhibit enormous potentials for environmental and hygienic application.
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Yue Sun,Simeng Shao,Yanfeng Wang,Wenjuan Lu,Pingping Zhang,Qingqiang Yao
For the first time, g-C 3 N 4 @α-Fe 2 O 3 /Co-Pi heterojunctional hollow spheres were successfully fabricated via thermal condensation method followed by solvothermal and photo-deposition treatment, which showed excellent photocatalytical property. Except for the Z-scheme charge transfer between α-Fe 2 O 3 and g-C 3 N 4 , the Co-Pi could further reduce the combination of photogenerated electrons and holes as a hole storage agent, resulting in remarkably enhanced visible-light photocatalytic water splitting activity with the H 2 production rate of 450 μmol h −1 g −1 , which is 15.7 times higher than that of g-C 3 N 4 . Moreover, the photocatalytic activity of the prepared ternary hollow photocatalysts showed almost no significant weakness after five cycles, which indicated their good performance stability. The as-prepared g-C 3 N 4 @α-Fe 2 O 3 /Co-Pi also possessed good activity for overall water splitting with the hydrogen production rate reaching 9.8 μmol h −1 g −1 . This synthesized g-C 3 N 4 @α-Fe 2 O 3 /Co-Pi composite is expected to be a promising candidate for water splitting.
研究领域:
材料科学
·
光催化
·
能源材料
·
纳米技术
✓ 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）