FOOD CHEMISTRY
·
2020
·
IF 6.306
Xianfeng Lin,Qianru Yu,Wei Yang,Chuxian He,You Zhou,Nuo Duan,Shijia Wu
Herein, a new double-enzymes-modulated fluorescent assay based on the quenching of upconversion nanoparticles (UCNPs) by Fe 3+ was constructed for sensitive determination of OPs. OPs can inhibit the activity of acetylcholinesterase to reduce the production of choline and further lead to the lack of H 2 O 2 in the presence of choline oxidase. Therefore, Fe 2+ cannot be converted into Fe 3+ , resulting in “turn-on” fluorescence of UCNPs. Under optimal conditions, an excellent linear correlation between the inhibition efficiency and the logarithm of the chlorpyrifos concentration was achieved with a detection limit (LOD) of 6.7 ng/mL in the range of 20–2000 ng/mL. The recovery for chlorpyrifos in apples and cucumbers was 89.5–97.1%. The results were consistent with those obtained by GC–MS. Overall, the integration of UCNPs into the double-enzymes-mediated Fe 3+ /Fe 2+ conversion endows this method with desirable rapidity, sensitivity, selectivity, stability, operational simplicity, and strong anti-interference capability, holding great potential in the application of food safety.
研究领域:
分析化学
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食品安全
·
环境科学
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Hongji Chen,Yan Wu,Huiping Xiao,Hongfei Yin,Qian Fei,Chunyu Yuan,Qiuyu Zhao,Yujin Zhang,Yongzheng Zhang,Woonming Lau
Owing to the low conversion efficiency of Fe 3+ to Fe 2+ during the peroxymonosulfate (PMS) activation process, the design of an efficient Fenton-like catalyst is still a challenge. In this work, 0D/2D Co-doped Fe 2 O 3 /g-C 3 N 4 (CNCFO) composite catalysts were constructed for organic pollutant degradation, where the Co-doping not only boosts the conversion efficiency of Fe 3+ to Fe 2+ , but also acts as active site for PMS activation. Among them, CNCFO2 showed excellent catalytic performance, where 96.4% of MO could be degraded within 45 s. X-ray photoelectron spectroscopy (XPS) confirmed that the cobalt doping promoted the cycle of Fe 3+ /Fe 2+ , which was responsible for the enhanced PMS activation. Meanwhile, the good stability and reusability of CNCFO2 itself provide opportunities for its potential practical applications. Based on systematical characterizations, the Z-scheme photo-Fenton mechanism was proposed. This study offers a fresh perspective on the advancement of designing highly efficient Fenton-like catalyst for applications in the field of environmental purification.
研究领域:
环境科学
·
催化材料
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产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2025
·Vol. 155
·期 4
·1-19
·
IF 2.4
Cheng Liu,Zhu Zhexin,Wang Gangqiang,Du Shiting
Since Peroxymonosulfate (PMS) is readily available and can produce sulfate radicals with a stronger oxidation capacity, the Fenton-like system Fe 2+ /PMS has gradually replaced Fe 2+ /H 2 O 2 system in organic pollutants degradation. However, the Fe 3+ /PMS system has almost no degradation effects, with the conversion of Fe 2+ to Fe 3+ being the rate-limiting step in the Fe 3+ /PMS system. In this paper, graphite-like phase carbon nitride (g-C 3 N 4 ) was employed to activate PMS using trace amounts of Fe 3+ for the treatment of water pollution under sunlight, and the Fe 3+ /g-C 3 N 4 /PMS system demonstrated the ability to rapidly degrade a wide range of difficult-to-degrade organic pollutants. The Fe 3+ /g-C 3 N 4 /PMS system was able to completely degrade carbamazepine (CBZ) within 30 min under sunlight. The fundings indicated that this system effectively improved the stringent limitations typically associated with Fenton process regarding the feed ratio of metal ions to oxidants, and could efficiently degrade CBZ across a broad pH range. In addition, the Fe 3+ concentration of 6.17 × 10 −6 M was used in the experiments to avoid the generation of large amounts of “iron sludge”. The trap burst experiments, DMSO oxidation experiments and electron paramagnetic resonance spectroscopy experiments indicated that O 2 · − and 1 O 2 exerted the major effectiveness in the photocatalytic degradation reaction of CBZ, and SO 4 · − and · OH jointly promoted the CBZ degradation. Graphical
研究领域:
环境科学
·
化学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 23
·22998-23008
·
IF 2.8
Zhao Junfeng,Wang Qun,Fu Yongsheng,Peng Bo,Zhou Gaofeng
In this study, the effect of Fe 3+ , Fe 2+ , and Mn 2+ dose, solution pH, reaction temperature, background water matrix (i.e., inorganic anions, cations, and natural organic matters (NOM)), and the kinetics and mechanism for the reaction system of Fe(VI)/Fe 3+ , Fe(VI)/Fe 2+ , and Fe(VI)/Mn 2+ were investigated systematically. Traces of Fe 3+ , Fe 2+ , and Mn 2+ promoted the DCF removal by Fe(VI) significantly. The pseudo-first-order rate constant ( k obs ) of DCF increased with decreasing pH (9–6) and increasing temperature (10–30 °C) due to the gradually reduced stability and enhanced reactivity of Fe(VI). Cu 2+ and Zn 2+ ions evidently improved the DCF removal, while CO 3 2− restrained it. Besides, SO 4 2− , Cl − , NO 3 − , Mg 2+ , and Ca 2+ almost had no influence on the degradation of DCF by Fe(VI)/Fe 3+ , Fe(VI)/Fe 2+ , and Fe(VI)/Mn 2+ within the tested concentration. The addition of 5 or 20 mg L −1 NOM decreased the removal efficiency of DCF. Moreover, Fe 2 O 3 and Fe(OH) 3 , the by-products of Fe(VI), slightly inhibited the DCF removal, while α-FeOOH, another by-product of Fe(VI), showed no influence at pH 7. In addition, MnO 2 and MnO 4 − , the by-products of Mn 2+ , enhanced the DCF degradation due to catalysis and superposition of oxidation capacity, respectively. This study indicates that Fe 3+ and Fe 2+ promoted the DCF removal mainly via the self-catalysis for Fe(VI), and meanwhile, the catalysis of Mn 2+ and the effect of its by-products (i.e., MnO 2 and MnO 4 − ) contributed synchronously for DCF degradation.
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研究领域:
环境科学
·
化学动力学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yeshuang Wang,Mingxian Duan,Zhelin Su,Chao Yang,Bingning Wang,Jiawei Kou,Huiling Fan
The abundant Fe 3+ Lewis acidic sites and well-developed pore structure endow the Fe-MOFs with great potential for H 2 S catalytic oxidation at room temperature, but their performance is inferior owing to the insufficient redox ability of the Fe 3+ species inherent in frameworks. Herein, an effective protocol was proposed for the first time to remarkably improve the catalytic oxidation performance of MIL-100(Fe) under ambient conditions through the introduction of Fe 2+ coordinatively unsaturated site (CUS) species into the framework. As expected, the sample after modification had a superior H 2 S breakthrough capacity of 267.3 mg S/g, an 18.4-fold increase compared with that without Fe 2+ CUS (14.5 mg S/g). The introduced Fe 2+ species triggered the Fe 3+ /Fe 2+ redox cycle for H 2 S catalytic oxidation by enhancing the oxidative ability of the Fe 3+ CUS intrinsic to the framework. Moreover, the Fe 2+ CUS was also found act as an active site for O 2 activation into O 2 ∙– , which not only provides an additional pathway for H 2 S catalytic oxidation but also accelerates the redox cycling of Fe 3+ /Fe 2+ during the catalytic oxidation process. On the basis of the experimental findings, a plausible catalytic mechanism involving mixed-valence iron sites in MIL-100(Fe) was proposed.
研究领域:
材料科学
·
催化化学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 2
·739-746
·
IF 3.591
Tao Wang,Xiqing Liu,Mei Liu,Runhua Liao,Hongquan Zhan,Xiaoxue Qi,Yongqing Wang,Yanju Huang
Black TiO2 and metal–organic frameworks (MOF) are great materials with light-harvesting ability, redox power and consequently catalytic activity. Here, the integration of MIL-100(Fe) with TiO2(B) composite was designed for photocatalytic application, which greatly promoted light-harvesting and charge transfer. As expected, the integrated TiO2(B)/MIL-100(Fe) composite showed high photocatalytic activity due to unique Fe–O–Ti bonds that were constructed, which acted as an electronic tunnel to reduce electronic transfer resistance between MIL-100(Fe) and TiO2(B). In addition, the presence of Fe–O clusters in MIL-100(Fe) can also promote the charge dissociation and improve catalytic activity via the Fe3+/Fe2+ redox cycle. This achievement would help us to understand and design charge transfer pathways in the integration of MOF/semiconductor photocatalysts.
研究领域:
材料科学
·
光催化
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Zhimin Cui,Yongyun Mao,Dandan Gao,Jiyang Xie,Wanbiao Hu
Stimuli-responsive hydrogels with reversible property switching are highly desired for soft electronics, but achieving this with a single stimulus remains challenging. Herein, a novel PAM/CMC@Fe 3 + dual-network hydrogel is engineered via a UV-triggered Fe 3 + /Fe 2 + valence cycle. UV light reduces Fe 3 + to Fe 2 + , producing a soft adhesive state, while subsequent air oxidation re‑oxidizes Fe 2 + to Fe 3 + , restoring the tough solid state. By simply tuning the Fe 3 + ‑to‑citrate ratio, mechanical properties and self‑healing efficiency are effectively programmed, navigating the trade‑off between mechanical integrity and healability. Taking advantage of this photosensitivity, the gel serves as a high‑performance bio‑ink for photocuring 3D printing. More importantly, its photo‑tunable adhesion enables an optically modulatable triboelectric nanogenerator (TENG) as an adaptive sensor. The gel acts as an intelligent triboelectric layer whose output signals are dynamically tuned by light, achieving a peak power density of ∼2.6 nW/cm 2 . This work demonstrates the gel's potential in wearable e‑skin for motion monitoring and robotic tactile perception, establishing a versatile platform from fundamental dynamic chemistry to functional device integration for next‑generation adaptive soft electronics.
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DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Suyan He,Luminita Marin,Xinjian Cheng
Fe 3+ and Fe 2+ are common metal ions in natural water environments and creatures. The development of water-soluble fluorescent sensors for detecting Fe 2+ /Fe 3+ ions was of great significance. In this work, two kinds of boron fluoride dipyrrole (BODIPY) fluorescent small-molecules were synthesized firstly. One of the small molecules contains a thioester bond that can be used as a chain transfer agent to participate in the polymerization process, and the other contains an unsaturated C = C double bond at the meso position. Through the reversible addition-fragmentation chain transfer polymerization (RAFT) polymerization method, methacrylic acid (MAA) and methacrylamide (MAM) were used as the main monomers, and small molecular fluorescent monomers were introduced to the end of the main chain. In this way, fluorescent macromolecules were obtained. The polymers were water soluble owing to the presence of long enough hydrophilic carboxyl and amide chains. These fluorescent probes exhibit high sensitivity to Fe 2+ /Fe 3+ , good selectivity, and anti-interference of other ions. The detection limit for Fe 2+ was as low as 2.3 × 10 −7 M, and the detection limit for Fe 3+ can reach up to 4.5 × 10 −7 M. The results show that these probes can be used as good sensors to identify Fe 2+ and Fe 3+ . Moreover, the fluorophores could be incorporated into polymer chains as the RAFT reagents and/or functional monomers.
研究领域:
化学
·
材料科学
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产品关联
DOI
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 21
·4188
·
IF 4.6
Chunhua Zhu,Jie Yao,Meng Du,Henghui Xu,Jintao Yu,Haotian Zhu,Zeyu Zhou,Jubing Zhang
As a conceptual study for low-energy hydrogen production, potentially coupled with off-grid photovoltaics, this work focuses on overcoming the constraint of the oxygen evolution reaction (OER), which features a high anode potential and significant overpotential. To reduce energy consumption, the Fe2+oxidation reaction is employed to replace OER, coupled with Fe2+regeneration using natural biomass. Experimental results reveal that Fe2+oxidation reaction is an effective substitute, with an initial oxidation potential of 0.5 V (vs. Hg/Hg2SO4), much lower than that of OER. Fe2+regeneration is notably influenced by both biomass type and reaction temperature. Chlorella pyrenoidosa (CP) achieves the highest Fe3+reduction rate of 90.5% at 190 °C. Water-soluble organic compounds generated during biomass oxidation exert a negative impact on Fe2+electrooxidation by accumulating on or coating the electrode surface, and the compounds derived from CP exert a less detrimental effect. Moreover, enhancing magnetic stirring, elevating temperature, and selecting an appropriate anode material can significantly boost the oxidation reaction. Under optimized conditions, the current density during electrolysis of CP filtrate at 1.1 V reaches 280 mA/cm2, much higher than values reported in similar studies. This highlights the great potential of this co-electrolysis approach for efficient hydrogen production driven by off-grid photovoltaic power.
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Da Ouyang,Ronghao Wu,Zhaojun Xu,Xiaomin Zhu,Yimin Cai,Ruihuan Chen,Changyin Zhu,Damià Barceló,Haibo Zhang
Advanced oxidation processes (AOPs) based on persulfate (PDS) activation by iron materials have attracted significant attention due to their high organic pollution removal efficiency and relatively low remediation costs. However, one of the iron-based materials’ shortcomings is the weak activation ability of Fe 3+ on PDS and the low sustainability of Fe 2+ in the oxidation environment. In this study, biochar-supported molybdenum dioxide (MoO 2 @BC) was employed as a co-catalyst to enhance the Fe 3+ based PDS activation for Bisphenol A (BPA) degradation. Results showed that >96 % of BPA was removed during 60 min, and the BPA degradation efficiencies only slightly decreased after four reuses of MoO 2 @BC. Electron paramagnetic resonance (EPR) analysis and quenching experiments indicated that reactive oxidation species (ROSs) contributing to the degradation of BPA were SO 4 − , OH and 1 O 2 . Besides, it was found that biochar supporting favours the adsorption of Fe 3+ on the MoO 2 surface and promotes the electron transfer from Mo(IV) to Fe 3+ based on the combination of X-ray photoelectron spectroscopy (XPS) analysis, electrochemical tests and density functional theory calculation (DFT). This work provides a new insight for enhancing the performance of organic contaminants degradation through AOPs based on persulfate activation by iron material.
研究领域:
环境科学
·
化学工程
·
材料科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Zhuoyu Bu,Minhui Hou,Zihao Li,Zhujun Dong,Lusha Zeng,Peng Zhang,Guangyu Wu,Xiang Li,Ying Zhang,Yuwei Pan
Boron was used as an environmentally friendly and efficient reductant to accelerate the recycle of Fe 2+ enhancing peroxymonosulfate (PMS) activation for sulfamethazine (SMT) degradation. The SMT removal was only 28.1% within 30 min in Fe 2+ /PMS system while SMT removal could reach to 98.9% within only 3 min in Boron/Fe 2+ /PMS (B/Fe 2+ /PMS). Electron paramagnetic resonance spectroscopy (EPR) tests, quantitative detection and radical quenching experiments illustrated that OH and SO 4 − played important role and Fe(IV), 1 O 2 and O 2 − also participated in SMT removal. The addition of boron could enhance the role of OH and SO 4 − in SMT removal in Fe 2+ /PMS system. X-ray photoelectron spectroscopy (XPS), electrochemical tests and density functional theory (DFT) calculation were conducted to confirm the mechanism of boron for accelerating the recycle of Fe 2+ . Possible SMT degradation pathway was proposed. B/Fe 2+ /PMS process could efficiently remove SMT at low Fe 2+ dosage and neutral pH. B/Fe 2+ /PMS system also exhibited a superior resistance to inorganic ions and nature organic matters. Moreover, B/Fe 2+ /PMS system had good applicability to different pollutants, excellent reusability for antibiotics removal, and efficient performance for removing antibiotics in nature fresh water. The results compared with others’ works also demonstrated the present study process was a promising strategy for antibiotics removal.
研究领域:
环境科学
·
化学工程
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DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Yanlin Zhang,Wei Chu
In this study, a Fe 3+ /g-C 3 N 4 hybrid catalyst system was proposed to activate peroxymonosulfate (PMS) for the metronidazole (MNZ) photocatalytic degradation . The two catalysts, Fe 3+ and g-C 3 N 4 , exhibited an obvious synergistic effect in the photocatalytic degradation process. When 1 mM PMS, 0.04 mM Fe 3+ and 0.05 g L −1 g-C 3 N 4 were applied, the rate constant of the Fe 3+ /g-C 3 N 4 /PMS/LED process at 0.07288 min −1 is around 3.6 to 6.8 times faster than that of Fe 3+ /PMS/LED and g-C 3 N 4 /PMS/LED processes at 0.0198 and 0.01076 min −1 , respectively. Under visible light, electron transfer from photo-activated g-C 3 N 4 to Fe 3+ , resulting in the continuous regeneration of Fe 2+ in the system, which ensures non-stopping production of radicals for MNZ degradation. UV–visible spectra were used to confirm the regeneration of Fe 2+ . In addition, EPR tests were used to identify the reactive oxygen species involved in the reaction system. Typically, the effects of various operation parameters, including the catalyst dosage, PMS dosage, initial concentration of MNZ and initial pH were examined. This work provided a new idea of promoting pollutant degradation by accelerating Fe 3+ /Fe 2+ redox through semiconductor, which could help to use the catalyst more effectively for wastewater treatment and/or chemical industries.
研究领域:
环境科学
·
化学工程
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）