LANGMUIR
·
2025
·
IF 3.9
Haixia Li,Chuanqiang Yin,Dan Li,Feigao Xu
In this study, oxygen vacancy-engineered FeP/BiOBr heterojunction composites (FB-3) were synthesized via a facile hydrothermal method to achieve enhanced tetracycline hydrochloride (TCH) degradation through a visible-light-driven photo-Fenton process. Systematic characterizations (SEM, XRD, XPS, and EPR) confirmed the successful integration of FeP with BiOBr, which modulated the band structure, introduced abundant oxygen vacancies (OVs), and suppressed photogenerated carrier recombination. Under the optimized conditions (0.2 g L–1 catalyst, 10 mM H2O2, and pH 4.2), the FB-3 composite achieved 94.2% TCH removal at an initial concentration of 40 mg L–1 within 90 min, with 73.9% TOC mineralization and minimal iron leaching of only 0.21 mg L–1. Mechanistic studies revealed that OVs acted as electron traps, accelerating Fe2+/Fe3+ redox cycling and synergistically activating H2O2 to generate dominant reactive radicals (•OH and •O2–). Radical trapping experiments and EPR analysis validated the critical roles of photogenerated carriers and OVs in enhancing surface kinetics. The composite exhibited robust performance in diverse water matrices, demonstrating potential for antibiotic wastewater treatment.
研究领域:
环境科学
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催化
·
材料科学
·
化学工程
·
水处理技术
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高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Fengxia Chen,Daojian Tang,Ya Wang,Tuo Li,Jiahai Ma
A novel catalyst which integrates heterogeneous and homogenous Fenton reactions is designed and fabricated by encapsulating 2,5-dihydroxy-1,4-benzoquinone (2,5-DBQ) in ECDP-Fe 3 O 4 , a composite of Fe 3 O 4 nanoparticles immobilized on a β-cyclodextrin polymer (ECDP) with ethylene diamine tetraacetic acid (EDTA) as cross-linking agent. The 2,5-DBQ@ECDP-Fe 3 O 4 has superior catalytic performance for 4-nitrophenol and 2,4-dichlorophenol degradation compared with control systems. Mechanism study revealed that although the initial active site is Fe 3 O 4 loaded on ECDP, the actually catalyst is the iron ions released from Fe 3 O 4 but confined within the composite. EDTA in β-cyclodextrin polymer can improve both the solubility and adsorption capacity to H 2 O 2 of Fe 3 O 4 . The quinone molecules 2,5-DBQ in the β-cyclodextrin cavity can accelerate Fe 3+ /Fe 2+ cycle adjacent to the cavity, thus in favor of the decomposition of H 2 O 2 into OH as main reactive oxidizing species. The current catalyst integrates the advantages of homogeneous and heterogeneous advanced oxidation processes and is promising in practical applications.
研究领域:
环境科学
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催化
·
化学工程
·
材料科学
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高影响因子
ENERGY AND BUILDINGS
·
2026
·
IF 8
Guang Yang,Meng Zhang,Hao Liang,Jiangyuan Li,Viktor Takats,Yaroslav Shpotyuk,Xiaoyan He
Energy-efficient windows are crucial for enhancing energy efficiency. However, developing novel window materials that simultaneously achieve high visible light transmittance, exceptional ultra-broadband near-infrared (NIR) shielding performance, neutral color appearance, long-term stability, cost-effectiveness, and sustainable production remains a formidable challenge. This study introduces a breakthrough material fulfilling all these requirements: ferrous ion-doped phosphosilicate glass (Fe 2+ -PSG), which emerges as a promising candidate for energy-efficient windows. Comprehensive characterization using UV–Vis-NIR transmittance/absorption spectroscopy and Raman spectroscopy reveals that Fe 2+ -PSG exhibits remarkable visible light transmittance of 83.7 ± 0.5%, a neutral color temperature of 6809 ± 53 K, and a high NIR shielding figure of merit of 1.80 ± 0.01. These exceptional properties primarily originate from the formation of colorless ferrous [FeO 6 ] units, influenced by phosphorus and cesium oxide incorporation. Moreover, Fe 2+ -PSG exhibits outstanding stability, retaining its optical performance for over 10 years under ambient conditions, and maintaining structural integrity after 24-hour immersion hot water (80 °C) and hot air (120 °C) exposures. These superior characteristics stem from unique structural modifications that modulate the crystal field splitting energy of Fe 2+ ions, enabling precise tuning of optical properties across the visible and NIR spectral ranges. Produced via a scalable, facile and low-cost melt-quenching process, Fe 2+ -PSG offers a feasible and sustainable solution for energy-efficient window fabrication. This innovation overcomes existing technological limitations and facilitates widespread practical applications.
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ADVANCED POWDER TECHNOLOGY
·
2026
·Vol. 37
·期 7
·105314
·
IF 4.5
Lin Li,Kaiyun Yang,Zhan Ding,Chang Liu
Spodumene is often associated with albite, and their similar physicochemical properties render conventional collectors ineffective for achieving selective flotation separation. This study introduces a Fe 2+ /PMS Fenton-like system to selectively enhance the adsorption of NaOL onto the spodumene surface, thereby enlarging the floatability difference between the two minerals and enabling their separation. Single-mineral flotation tests demonstrated that under optimal conditions (pH 9, NaOL dosage 8 × 10 -4 mol/L, and Fe 2+ /PMS dosage 2 × 10 -4 mol/L with a Fe 2+ :PMS molar ratio of 1:3), the recoveries of spodumene and albite were 92.37% and 8.64%, respectively. Flotation experiments on an artificial mixed mineral (spodumene:albite = 1:3) yielded a spodumene concentrate with a Li 2 O grade of 6.73% and a recovery of 88.17%. The separation mechanism was elucidated through contact angle measurements, atomic force microscopy (AFM), zeta potential analysis, electron paramagnetic resonance (EPR), and X-ray photoelectron spectroscopy (XPS). The results indicate that the Fe 2+ /PMS system selectively generates reactive oxygen species (SO 4 • − and •OH) on the spodumene surface. These species oxidize Fe 2+ to Fe 3+ , leading to the adsorption of more Fe 3+ species on spodumene which subsequently act as active sites for oleate anion adsorption. In contrast, the system exhibited a comparatively minor effect on the albite surface. This work provides a novel reagent approach and a theoretical foundation for the flotation separation of spodumene from albite.
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RSC Advances
·
2021
·Vol. 11
·期 15
·8963-8969
·
IF 3.361
Zhiying Li,Congshu Li,Huiyun Yan
Designing exceptional probes to detect minute quantities of chromium(VI) is of huge importance for the safety and health of the human race. In this study, a green fluorescence emission probe (polyethylene Schiff base-chelated Fe2+ complex) was synthesized by a one-pot synthesis method for the highly selective and sensitive detection of Cr(VI) in an aqueous solution. The complex of polyethylene Schiff-Fe2+ was fully characterized, and it displayed satisfactory stability in the aqueous solution. The fluorescence emission could be quenched specifically by the introduction of Cr(VI) via the oxidation of the Fe2+-centered polyethylene Schiff base complex. The fluorescence intensity decreases linearly with the concentration of Cr(VI), and the corresponding detection limit was calculated to be 0.18 μM. Thus, the obtained fluorescence detection system could be used for Cr(VI) detection in tap water. These features provide potential uses of the as-prepared polyethylene Schiff-Fe2+ complex as a sensor for environmental applications.
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高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Jinbin Lin,Junyang Xiao,Hengyu Cai,Yixin Huang,Jiawen Li,Haoyu Yang,Tao Li,Jing Zou
In this study, a multi-wavelength spectrophotometric method for simultaneous determination of peracetic acid (PAA) and coexistent hydrogen peroxide (H 2 O 2 ) was presented. This method was based on the oxidation of 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) with the assistance of Fe 2+ /KI to produce a stable green radical (ABTS ●+ ), which could be determined at four characteristic peaks (i.e., 415 nm, 650 nm, 732 nm, and 820 nm). The absorbances of ABTS ●+ at four peaks were well linear (R 2 > 0.999) with concentrations of both total peroxides (PAA + H 2 O 2 ) and PAA in the range of 0–40 μM under optimized conditions. The sensitivities for determining total peroxides at 415 nm, 650 nm, 732 nm and 820 nm were determined to be 4.248 × 10 4 M −1 cm −1 , 1.682 × 10 4 M −1 cm −1 , 2.132 × 10 4 M −1 cm −1 , and 1.928 × 10 4 M −1 cm −1 , respectively. For determining PAA, the corresponding sensitivities were 4.622 × 10 4 M −1 cm −1 , 1.895 × 10 4 M −1 cm −1 , 2.394 × 10 4 M −1 cm −1 and 2.153 × 10 4 M −1 cm −1 , respectively. The concentration of coexistent H 2 O 2 was gained by deducting PAA concentration from total peroxides concentration. The ABTS method was accurate enough to determine PAA concentration in natural water samples. Moreover, the ABTS method was successfully used to determine the changes of PAA and coexistent H 2 O 2 and to distinguish their role on naproxen degradation in heat-activated PAA process. Overall, the ABTS method could be used as an alternative method for the convenient, rapid and sensitive determination of PAA and the coexistent H 2 O 2 in water samples.
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高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Fuyou Du,Zhenfang Cheng,Wei Tan,Lingshun Sun,Guihua Ruan
Sulfur-doped carbon quantum dots (S-CQDs) with stable blue fluorescence were synthesized through a facile one-step hydrothermal method by using ascorbic acid and thioglycolic acid as carbon and sulfur sources. The prepared S-CQDs exhibited a sensitive and selective response to Fe 3+ ions in comparison with Fe 2+ and other metal ions , In the presence of adequate H 2 O 2 , Fe 2+ was completely transformed to Fe 3+ that is the determinable form of iron ions , and the difference in the change of the fluorescence intensity of S-CQDs before and after adding H 2 O 2 was used for detection of Fe 2+ and Fe 3+ ions, respectively. Under the optimum experimental conditions, the fluorescence intensity of S-CQDs gradually decreased with increasing of Fe 3+ concentration ranging from 0 to 200 μM. Good linearity was achieved over the range of 0-200 μM. The detection limit of the developed method was 0.050 μM for Fe 3+ . The recoveries of Fe 2+ and Fe 3+ spiked in real samples ranged from 98.2% to 112.4%. Finally, the proposed S-CQDs integrated with Fenton system was applied to the detection of Fe 2+ and Fe 3+ ions in oral ferrous gluconate samples, which presents potential applications in the speciation and determination of Fe 2+ and Fe 3+ ions in complex samples.
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2022
·
IF 3.841
Lina Guo,Xiaochao Chen,Ruijun Xie,Limin Han,Ning Zhu
4-Phenyl-2-(2′-pyridyl) quinoline ( L1 ) was synthesized by a three-component reaction of aniline, phenylacetylene and pyridine-2-aldehyde catalyzed by trifluoromethanesulfonic acid (TfOH). Its structure was confirmed by FT-IR, MS, NMR and X-ray single crystal diffraction analysis. L1 was investigated as a probe for the detection of Fe 3+ and Fe 2+ ions, which displayed fluorescence enhancement by Fe 3+ and fluorescence quenching by Fe 2+ . This unique fluorescence switching property of L1 was used to identify Fe 2+ and Fe 3+ with high selectivity and sensitivity. The detection limit of Fe 2+ was 8.772 × 10 −9 mol/L and that of Fe 3+ was 1.912 × 10 −9 mol/L. Mechanism investigation revealed that the fluorescence quenching of probe L1 was caused by ferrous-induced PET process and the fluorescence enhancement was due to the combinational effect of ferric-induced PCT enhancement and PET inhibition. In addition, the cyclic voltammetry curves demonstrated that both the Fe 2+ complexes and the Fe 3+ complexes displayed reversible redox process, indicating that the Fe 2+ and Fe 3+ complexes can be reversibly converted into each other upon electrical stimulation. The reversible “On” and “Off” of the fluorescence emission of iron complexes upon electrochemical stimulation could potentially be used in information recording and erasing.
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JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
2024
·
IF 3.3
Kangyu Zhao,Xin Long,Junle Li,Ying Wang,Ping Lan,Yong Wang
BACKGROUND The Maillard reaction involves the interaction of various amino acids and reducing sugars, resulting in food browning. It often produces appealing aromas and flavors. The complexities of the reaction are such that it can be challenging to identify the often numerous and frequently volatile products formed by it. In the present study, we sought to identify and evaluate an unusual product with anti-oxidant activity arising from a fructose-histidine Maillard reaction model. The anti-oxidant profile of this product was assessed by computational means. RESULTS The fructose-histidine Maillard reaction products (FH-MRPs) were generated by heating a 2:1 mixture of the sugar and the amino acid at 140 °C for 2 h. Chromatographically separable fractions, labelled DM-1 to DM-8, were obtained using silica gel as the stationary phase and dichloromethane/methanol (DCM/MeOH) mixtures as the mobile one. Fraction DM-5 exhibited the highest 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity, and further bio-assay guided fractionation led to isolation and identification of 1-(1 H -imidazo[4,5- c ]pyridin-4-yl)ethenone (IMPE) as the active principal, the structure of which was established by nuclear magnetic resonance (NMR) spectroscopic and mass spectral techniques. A mechanism for the formation of IMPE from its precursors is proposed. Density functional theory (DFT) calculations suggest this novel heterocyclic compound exerts its anti-oxidant effects by interacting with DPPH and 2,2'-Azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) radicals. Essentially, IMPE was non-toxic below 300 ug mL −1 , showing a concentration-dependent free radical clearance capacity and reducing power within the 100–1000 μg mL −1 range, and moreover, exhibiting significant Fe 2+ chelating abilities wihin the 50-200 μg mL −1 range. CONCLUSION This study identified the unique FH-MRP, IMPE, and found that it acts as food antioxidant through the chelation of metal ions. © 2024 Society of Chemical Industry.
研究领域:
食品化学
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分析化学
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计算化学
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高影响因子
Chemistry Central Journal
·
2017
·Vol. 11
·期 1
·1-8
·
IF 2.442
Xie Yulu,Li Xican,Xu Jieying,Jiang Qian,Xie Hong,He Jianfeng,Chen Dongfeng
Background
Suoyang originates from a psammophyte named Cynomorium songaricum Rupr and has been known as a phenolic-antioxidant-enriched traditional Chinese herbal medicine. The present study attempted to investigate the protective effect of phenolic antioxidants in Suoyang towards •OH-mediated MSCs and then further discusses the chemical mechanisms.Methods The lyophilized aqueous extract of Suoyang (LAS) was prepared and characterized using HPLC. Then, two phenolic antioxidant references, epicatechin and luteolin-7-O-β-D-glucoside, along with LAS, were investigated for their effects on the viability of •OH-treated MSCs using the 3-(4, 5-dimethylthiazol-2-yl)-2,5-diphenyl (MTT) assay. The comparison and mechanistic chemistry of epicatechin and luteolin-7-O-β-D-glucoside were further explored using various antioxidant assays, including PTIO•-scavenging, FRAP (ferric ion reducing antioxidant power), ABTS+•-scavenging, and DPPH•-scavenging. Their Fe2+-binding capacities were also compared using ultraviolet (UV) spectra.Results The HPLC analysis indicated that there are 8 phenolic antioxidants in LAS, including epicatechin, luteolin-7-O-β-D-glucoside, gallic acid, protocatechuic acid, catechin, isoquercitrin, phlorizin, and naringenin. The MTT assay revealed that epicatechin could more effectively increase the survival of •OH-treated MSCs than luteolin-7-O-β-D-glucoside. Similarly, epicatechin exhibited higher antioxidant abilities than luteolin-7-O-β-D-glucoside in the DPPH•-scavenging, ABTS+•-scavenging, FRAP, and PTIO•-scavenging assays. In the Fe2+-binding assay, luteolin-7-O-β-D-glucoside gave a stronger UV peak at 600 nm, with ε = 2.62 × 106 M−1 cm−1, while epicatechin produced two peaks at 450 nm (ε = 8.47 × 105 M−1 cm−1) and 750 nm (ε = 9.68 × 105 M−1 cm−1).Conclusion As two reference antioxidants in Suoyang, epicatechin and luteolin-7-O-β-D-glucoside can enhance the viability of •OH-damaged MSCs. Such a beneficial effect may be from their antioxidant effects, including direct-antioxidant and indirect-antioxidant (i.e., Fe2+-binding) processes. In the direct-antioxidant process, proton (H+), one electron (e), or even hydrogen-atom (•H) transfer may occur to fulfill radical-scavenging (especially •OH-scavenging); in this aspect, epicatechin is superior to luteolin-7-O-β-D-glucoside due to the presence of more phenolic –OHs. The additional –OHs can also be responsible for the better cytoprotective effect. In terms of indirect-antioxidant potential, however, epicatechin is inferior to luteolin-7-O-β-D-glucoside due to the absence of a hydroxyl-keto moiety. These findings will provide new information about medicinal psammophytes for MSC transplantation.
研究领域:
药理学
·
药物化学
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细胞生物学
·
中医药
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Sheng Liang,Jinling Wang,Zhizhi Shen,Wei Yan,Lichao Nengzi,Chunhua Feng,Xin Lei,Li Yu,Junqing Hu
The strategy to mineralize dissolved organics for the decontamination of landfill leachate concentrate (LLC) is expensive. Because mineralization requires high stoichiometric ratio of oxidants (e.g., •OH) or electron transfer (i.e., energy) to the pollutant molecules. Whereas, transferring the dissolved organic pollutants into separable insoluble matters is an energy-saving strategy. Herein, we developed a dual-anode Fe 2+ /HClO system for removing dissolved organic pollutants in LLC through insolubilization based on oxidative coupling. In this system, the majority of dissolved organic pollutants were transferred into insoluble substances, which could be removed easily. As a result, 89.8 % of the dissolved organic carbon (DOC) in LLC was fast removed in 3 h with a low specific energy consumption (SEC, 4.0 kWh kg −1 COD and 17.6 kWh kg −1 DOC), and the formation of toxic by-products can be well controlled to total organic chlorine (TOCl) < 0.1 mg/L. The formation of insoluble substances was attributed to the oxidative coupling of organic small molecules into the macromolecular ones. This was evidenced by the generation of insoluble compounds with the larger molecular mass, and the formation of coupling or polymerization products of the model pollutant (guaiacol). The predominant mechanism was proposed that Fe(IV) was generated in the dual-anode Fe 2+ /HClO system, and Fe(IV) oxidized pollutants to produce organic radicals, then the organic radicals coupled and polymerized to form larger molecules and insoluble compounds. This work offers a novel electrochemical method for efficient removal of organic pollutants in LLC with minimal toxic by-products generated, and revealed the significance of oxidative coupling process in the electrochemical Fe 2+ /HClO system.
研究领域:
环境科学
·
电化学工程
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高影响因子
FUEL
·
2025
·
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
·
生物质能源
·
材料科学
·
环境友好化学
·
表面科学
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高影响因子
危险品化学品经营许可证（带存储）