MATERIALS CHEMISTRY AND PHYSICS
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2017
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IF 2.084
Mingming Zou,Fengqiang Xiong,Ayyakannu Sundaram Ganeshraja,Xiaohua Feng,Chuanxi Wang,Tiju Thomas,Minghui Yang
Iron (III) and nitrogen co-doped mesoporous TiO 2 microspheres (Fe-N-TiO 2 ) are prepared using a self-assembly based solvothermal process followed by an ammonothermal method. Among all samples, 1 mol.% of Fe dopants and 500 °C nitridation (for 2 h) gives the highest visible light photoactivity. Results imply that the Fe 3+ /Fe 2+ dopant trap energy level introduced within the band gap in mildly Fe (∼1 at%) doped TiO 2 and the mesoporous nature of the material, both aid in the observed catalytic performance. Subjecting Fe-TiO 2 samples to ammonothermal process induces oxygen vancancies, and substitutional and interstitial N. This reduces optical band gap, and introduces local states. The lower band gap and local states together aid in the absorption of visible light and separation of charge carriers. Co-dopants are distributed uniformly in the best photocatalysts . The active species generated in the photocatalytic system is shown to be singlet molecular oxygen ( 1 O 2 ) using selective radical quenchers.
研究领域:
材料科学
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化学工程
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环境科学
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产品关联
DOI
高影响因子
Journal of Composites Science
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2025
·Vol. 9
·期 5
·250
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IF 3.7
Waheed Rehman,Faiq Saeed,Samia Arain,Muhammad Usman,Bushra Maryam,Xianhua Liu
NiFe2O4and TiO2are widely studied for photoelectrochemical (PEC) applications due to their unique properties. Nitrogen-doped graphene (NG) and metal–organic frameworks (MOFs), such as MIL-100(Fe) (where MIL stands for Materials of Lavoisier Institute), are commonly incorporated to enhance PEC performance by offering a high surface area and facilitating efficient charge transport. Composite systems are commonly employed to overcome the limitations of individual PEC catalysts. In this study, a highly efficient NiFe2O4/NG@MIL-100(Fe)/TiO2photoanode was developed to enhance photoelectrochemical water-splitting performance. The composite was synthesized via a hydrothermal method with a two-step heating process. X-ray diffraction confirmed the expected crystal structures, with peak broadening in NiFe2O4indicating reduced crystallite size and increased lattice strain. X-ray photoelectron spectroscopy of the Ni 2p and Fe 2p regions validated the successful integration of NiFe2O4into the composite. Electrochemical analysis demonstrated excellent performance, with linear sweep voltammetry achieving a peak photocurrent density of 3.5 mA cm−2at 1.23 V (vs RHE). Electrochemical impedance spectroscopy revealed a reduced charge-transfer resistance of 50 Ω, indicating improved charge transport. Optical and electronic properties were evaluated using UV-Vis spectroscopy and Tauc plots, revealing a direct bandgap of 2.1 eV. The composite exhibited stable photocurrent under amperometric J-t testing for 2000 s, demonstrating its durability. These findings underscore the potential of NiFe2O4/NG@MIL-100(Fe)/TiO2as a promising material for renewable energy applications, particularly in photoelectrochemical water splitting.
研究领域:
材料科学
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能源科学
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电化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Lingling Wang,Yunning Chen,Yuxin Zheng,Xueying Cheng,Jiawei Hao,Qingkun Shang
Eight composite photocatalysts were synthesized. Er- and Fe-doped TiO 2 photocatalysts were prepared first, and their photocatalytic performance for phenol degradation was investigated. Furthermore, three pyridine derivatives and 1,10-phenanthroline were bonded to Er-Fe-TiO 2 , which greatly improved the efficiency and rate of photocatalytic degradation of phenol and chlortetracycline hydrochloride. The absorption spectra, fluorescence spectra, photocurrent density, impedance spectra, and ESR radical measurements of eight different photocatalysts were investigated. On this basis, combined with a discussion on the matching of the molecular orbital energy levels of pyridine derivatives and 1,10-phenanthroline with the band gap of Er-Fe-TiO 2 , a possible mechanism of electron transport was proposed for the photocatalysis process. We studied the degradation of chlortetracycline hydrochloride or a mixture of phenol and four antibiotics using four composite photocatalysts. The possible degradation sites of chlortetracycline hydrochloride were predicted by theoretical calculations, and some results were consistent with those detected by HPLC-MS.
研究领域:
环境科学
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材料科学
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化学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 39
·18744-18750
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IF 3.925
Dawang Chu,Hui Zhou,Zhicheng Luo
Selective conversion of glycerol to lactic acid requires the synergistic activation of C–H, C–O, and O–H. Herein, we report an inexpensive Fe–Cr/TiO2 catalyst that achieves lactic acid formation with a high selectivity of 60.5%. By changing the Fe/Cr ratios and reduction temperatures, the structures of Vő and Vő-OH were altered, which determined the overall oxidation–dehydration–isomerization process. The in situ ATR-IR experiments confirmed the activation of glycerol by adsorbing the primary −OH, and a series of control experiments verified that Fe was responsible for the cleavage of C–H and O–H, while CrOx catalyzed the activation of C–O and C–H. This work designs a hydrothermal catalyst with multifunctional ability, which may guide the rational catalyst design for the selective oxidation of glycerol to lactic acid.
研究领域:
催化化学
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材料科学
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绿色化学
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产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
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2025
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IF 6
Jingzhi Zhou,Xichen Shi,Chaoqin He,Xiuwen Zheng,Ruo Yuan,Xia Yang
Background Entropy-Driven Circuits (EDC), distinguished by their spontaneous operation and absence of enzymatic reactions, represent a superior strategy for integration with CRISPR/Cas systems, as they obviate the potential for interference among various enzymes during the process of DNA amplification and CRISPR/Cas system integration. Due to the wide band gap of TiO 2 , its response to visible light is limited, and owing to its high crystallinity and exceptionally stable crystal lattice, the charge transfer (CT) process in TiO 2 is suboptimal. Results In this study, lychee-like Fe–TiO 2 was firstly prepared to serve as Raman enhanced substrate, facilitating exciton capture and separation to exhibit an excellent Surface-enhanced Raman spectroscopy (SERS) performance. It is proven that the incorporation of Fe results in a significantly narrower band gap for TiO 2 , facilitating exciton resonance. The amount of Fe in TiO 2 was optimized to fabricate a SERS biosensor for detection of miRNA-21 based on the Cas13a assisted entropy-driven system. The detection limit of miRNA was 43.88 fmol/L. Significance This work proposes a sensing strategy that integrates the CRISPR/Cas system with EDC, leveraging a semiconductor substrate exhibiting superior SERS performance to provide a stable Raman signal, thereby enabling highly sensitive detection of miRNA-21, which has a potential application in disease early warning and treatment.
研究领域:
生物传感器
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纳米技术
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生物化学
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材料科学
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分子生物学
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分析化学
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产品关联
DOI
PubMed
高影响因子
CATALYSIS TODAY
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2015
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IF 3.893
Yanjie Wang,Yanjie Zhang,Fuhai Yu,Changzi Jin,Xin Liu,Jingyuan Ma,Yu Wang,Yuying Huang,Junhu Wang
Rutile Sn-Fe-TiO 2 photocatalysts with high visible-light-driven activity were synthesized by an improved soft chemical solution process for investigating the potential correlation between their photocatalytic performance and coordination structure. The prepared photocatalysts were systematically characterized by XRD, BET, Raman, TEM, UV–vis, XPS, XAFS and Mössbauer techniques. Their photocatalytic performances were evaluated by degrading the model pollutant of methylene blue aqueous solution under visible light irradiation ( λ ≥ 400 nm). The results indicated that tin and iron ions could substitute Ti 4+ in the rutile TiO 2 lattice, and specially, iron ions were located at tetrahedrally coordinated titanium sites. Their visible-light-driven photocatalytic activities were found to culminate at a very low level of iron doping (Fe/Ti = ∼0.1 at.%, Sn/Ti = 2.0 at.%), this was 5-fold of P25 and 2-fold of undoped rutile TiO 2 . It was confirmed that besides the high surface area, fine crystallinity, enhanced visible light absorption and optimized oxygen vacancy concentration, the mole ratio of tetrahedrally coordinated iron and titanium was also essential to modify their visible-light-driven photocatalytic properties.
研究领域:
材料科学
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环境化学
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纳米催化
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表面科学
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无机化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2022
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IF 10.383
Jie Yang,Jia Li,Xiaohui Yan,Yangsai Lyu,Ningning Xing,Ping Yang,Peng Song,Min Zuo
A novel multifunctional Janus magnetic micromotor was designed and constructed by using MIL-100(Fe)@TiO2@Fe3O4 multicore–shells modified with horseradish peroxidase (HRP) as a smart active platform to realize detection and degradation of hydroquinone (HQ). The obtained micromotor showed a unique three-dimensional (3D) hierarchical architecture with highly exposed active sites and could autonomously move at a speed of 140 ± 7.0 μm·s–1 by O2 bubbles generated from the catalytic decomposition of H2O2 fuel. Benefiting from the combination of active self-propulsive motion, high peroxidase-like activity, tuned heterojunctions with matching band structures, and a 3D hierarchical structure, an effective platform involving dynamically sensitive detection and quick removal of HQ from water was established by using the multifunctional HRP-integrated MIL-100(Fe)@TiO2@Fe3O4 Janus micromotor. The proposed multifunctional Janus magnetic micromotor had advantages of simple and feasible fabrication, sensitive detection and effective photo-Fenton degradation of HQ in a wide pH range of 4–7, and magnetic recycling, revealing potential for environmental remediation applications.
研究领域:
环境科学
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纳米材料学
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生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
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2025
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IF 7.5
Shijie Ma,Hangcheng Song,Jun Chen,Shuyan Yu,Hongyu Zhao
Biomass-derived 5-hydroxymethylfurfural (HMF) to 2,5-dihydroxymethylfuran (DHMF) is a pivotal process in biomass valorization, however, it is hindered by the high cost of noble metal catalysts and environmental hazards posed by toxic copper-chromium systems. Herein, we report an unexpected discovery that naturally occurring Fe-Ti impurities in kaolinite act as a highly efficient heterogeneous catalyst for this reaction, challenging the conventional notion that impurities are detrimental to catalytic performance. Through hydrothermal synthesis and controlled reduction, Fe species are highly dispersed on the TiO 2 rutile surface, forming a synergistic Fe 2+ -oxygen vacancy-Ti 4+ (Fe 2+ -O v –Ti 4+ ) interface. The catalyst exhibits outstanding activity and selectivity under mild conditions (50 °C, 0.6 MPa H 2 ), achieving 97.6 % HMF conversion and 93.3 % DHMF selectivity, significantly outperforming catalysts based on kaolin and pure TiO 2 . Kinetic analysis reveals an apparent activation energy of 50.14 kJ/mol and a near first-order dependence on HMF concentration. Combined DFT calculations and in situ DRIFTS spectra confirm that the Fe 2+ -O v interface facilitates the adsorption of the HMF aldehyde group (adsorption energy −0.56 eV) and lowers the energy barrier for H 2 dissociation to 0.06 eV, enabling highly selective C=O hydrogenation. Moreover, the reaction benefits from the strong polarity of water and the hydrogen-bonding capacity, which further enhances catalytic performance. The catalyst retains over 90 % activity after 10 cycles, demonstrating excellent stability. This work not only provides a sustainable route for high-value utilization of kaolin-associated metal impurities, but also offers theoretical insights into the rational design of non-precious metal catalysts for biomass transformation.
研究领域:
催化化学
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生物质能源
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材料科学
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环境友好化学
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表面科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）