MICROCHEMICAL JOURNAL
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2018
·
IF 2.746
Xue Gong,Heyang Zhang,Nan Jiang,Lin Wang,Guang Wang
An oxadiazole-based chemosensor (sensor 1) for Fe 3+ /Fe 2+ was successfully designed and synthesized. Sensor 1 displayed fluorescence quenching response towards both Fe 3+ and Fe 2+ in THF:H 2 O (4:1, v/v) solvent with high selectivity and sensitivity over all other competitive metal ions . Job's plot, mass spectra, DFT calculation and fluorescence titration disclosed that fluorescence quenching was caused by forming 1:1 complex between sensor 1 and iron ions . Sensor 1 presented high sensitive fluorescence response at the pH value of human body and its fluorescence intensity showed linear relationship with the concentration of iron ion. Sensor 1 also presented fast fluorescence response towards iron ions and the lower detection limit, 7.78 μM for Fe 2+ ion and 6.95 μM for Fe 3+ ion, respectively. Sensor 1 can be used as test strips to detect iron ions in water samples. Fluorescence cell imaging also demonstrated sensor 1 can recognize iron ions in living cells.
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JOURNAL OF POROUS MATERIALS
·
2018
·Vol. 25
·期 6
·1587-1595
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IF 1.858
Shen Yu,Wang Fumin,Liu Wei,Zhang Xubin
A series of Fe 3+ containing catalysts were synthesized using ion-exchange technique over hierarchically porous ZSM-5 (M-ZSM-5) and micro-mesoporous composite ZSM-5/MCM-41 (ZSM-5/MCM-41), respectively. The prepared catalysts were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope, N 2 adsorption–desorption, UV–Vis spectroscopy, temperature programmed reduction and inductively coupled plasma-optical emission spectroscopy. The characterization results exhibit that the hierarchically porous ZSM-5 was synthesized with intracrystalline mesopores, while the micro-mesoporous composite ZSM-5/MCM-41 was prepared with the well-ordered mesopores. Furthermore, the results also prove that the existence of iron in the catalysts was mainly presented in the form of Fe 3+ ions. Catalytic performances of the samples for phenol hydroxylation were compared by using H 2 O 2 as oxidant. Under the optimized conditions, Fe 3+ ion-exchanged M-ZSM-5 (Fe-M-ZSM-5) shows that a phenol conversion of 42.3% obtained with 92.5% selectivity to dihydroxybenzenes, whereas Fe 3+ ion-exchanged ZSM-5/MCM-41 (Fe-ZSM-5/MCM-41) give 46.2% phenol conversion and 90.1% dihydroxybenzenes selectivity, which are all better than most reported results. The recyclability tests show that Fe-ZSM-5/MCM-41 with ordered mesoporous structure and bigger surface area has better anti-deactivation performance than Fe-M-ZSM-5. The excellent catalytic performances were due to the improved diffusion performance with newly created mesopores and the highly active Fe 3+ species obtained by ion-exchange technique.
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RSC Advances
·
2019
·Vol. 9
·期 15
·8290-8299
·
IF 3.049
Dandan Xu,Fang Lei,Haohong Chen,Luqiao Yin,Ying Shi,Jianjun Xie
In our work, blue photoluminescent N-doped carbon dots (CDs) were developed via a green and simple hydrothermal method with citric acid and polyvinyl pyrrolidone (PVP K-30) as the carbon source and the nitrogen source, respectively. The as-prepared CDs have a high fluorescent quantum yield of 30.21% and considerable luminescence stability. The fluorescence intensity of the CDs was found to be effective quenched when adding Fe3+ ions to the CDs solution. The quenching phenomenon can be used to detect Fe3+ ions within a linear range of 0–300 μM with a detection limit of 45.5 nmol L−1, which suggested its potential application in the detection of Fe3+ ions. At the same time, we also noted the excellent self-quenching-resistant property of the as-prepared CDs in the solid state, and bright blue fluorescence was observed under UV excitation. What's more, the as-prepared CDs can also be used as fluorescent ink and were presented under UV excitation.
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Journal of Materials Chemistry C
·
2025
·
IF 5.1
Ruipeng Shen,Min Li,Shuo Wang,Yu-Mo Zhang,Sean Xiao-An Zhang
Based on the dynamic coordination and dissociation of a leuco dye and Fe2+/Fe3+, we constructed an electrochromic system where the coloring unit and redox unit were separate. This electrochromic system combined the advantages of the stability of the metal ions and the color adjustability of the dyes. The electrochromic mechanism was found to be universal to multiple leuco dyes and the device showed an absorption change of 0.25 and a coloration efficiency of 192 cm2 C−1. Moreover, compared with our previous work, the cycle life was effectively improved (up to 4900 cycles), which was suspected to result from the smaller oxidizing potential of Fe2+. This approach to improve the cycle life of electrochromic devices may inspire further important results in the future.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Yongming Guo,Fengpu Cao,Yabo Li
A facile and one-step strategy has been developed for the preparation of highly fluorescent nitrogen and phosphor co-doped carbon quantum dots (NP-CQDs) through the thermal treatment of the mixture of citric acid and O -phosphorylethanolamine. The as-prepared NP-CQDs emit strong blue-green light under irradiation of 365 nm light and show emission maxima at 475 nm in aqueous solution. And these NP-CQDs exhibit great stability in high-salt conditions, excellent photostability and a high quantum yield of about 8.45%. Interestingly, the NP-CQDs have been successfully utilized for the sensitive and selective fluorometric detection of Fe 3+ without interference from other ions in aqueous solution. Moreover, we have found that the NP-CQDs can enhance the photocatalytic activity of TiO 2 for the degradation of dyes under simulated sunlight irradiation.
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TALANTA
·
2017
·
IF 4.162
Liping Zhang,Bo Ling,Lun Wang,Hongqi Chen
An upconversion luminescence method was developed for the determination of glutathione (GSH), L -cysteine (Cys) or L -ascorbic acid (AA) based on redox reaction . We synthesized poly(acrylic acid) (PAA)-modified Mn 2+ -doped NaYF 4 :Yb,Tm upconversion nanoparticles (UCNPs), and the luminescence of these UCNPs was effectively quenched due to their carboxyl groups coordinating with Fe 3+ to form a UCNPs/Fe 3+ system. GSH, Cys or AA reduced Fe 3+ to Fe 2+ , which induced the luminescence recovery of the UCNPs. Under the optimized conditions, wide linear concentration ranges from 0.25-300 μM for GSH, 0.5–875 μM for Cys and 0.5–350 μM for AA were found, and the detection limits (3 S/K) were 0.2 μM, 0.5 μM and 0.2 μM, respectively. Thus, the UCNPs/Fe 3+ system was successfully applied for sensing GSH, Cys or AA.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Xiujuan Hao,Yukai Hu,Rijian Quan,Xiayu Xu,Xin Liu,Yukun Li,Jiayu Tian
Most wastewater treatment plants (WWTPs) encounter the problem of insufficient carbon sources. Particularly, the removal of organic pollutants is severely affected by carbon limitation and thus requires the use of external carbon sources in the secondary biological treatment process, which considerably increases operating costs. Even after the secondary treatment of high-concentration organic wastewater, the effluent still contains various organic substrates, such as low molecular weight organic acids and carbohydrates, etc., which can be used as carbon sources in the process of nitrogen and phosphorus removal. Effective separation and recovery of organic carbon sources in high-concentration organic wastewater are crucial to realize the resource utilization of organic carbon sources. In this study, a novel sandwich-structure thin-film composite (TFC) nanofiltration membrane was synthesized via chemically bonding polyvinyl alcohol (PVA) to form an interlayer and surface modification by Fe 3+ and tannic acid (TA) chelating coordination on the polyamide (PA) layer. The design promoted the deposition of metal polyphenol networks on the PA layer, exposing more chelating sites while reducing the hydraulic resistance generated by deposition. The interlayer improved the permeability of the membrane, and the deposition of Fe–TA complexes enhanced membrane separation efficiency. Compared with the TFC-Fe membrane, the resulting membrane (PVA-TFC-Fe) showed a 56.42 % increase in permeability and enhanced rejection of inorganic salts and small-molecule organic carbon sources. Compared with the retention of the TFC-control membrane, that of PVA-TFC-Fe for small-molecule carbon sources, namely, acetic acid, propionic acid, and butyric acid, increased by 19.05 %, 17.34 %, and 15.67 %, respectively, and exhibited long-term operational stability.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Wei Liu,Kangcheng Zhao,Feng Chen,Chenkai Cai,Tianyuan Jiang,Liying Zhu,Chunyang Yu,Fang Liu,Muyu Yu
Poorly-controlled blood glucose frequently develop in diabetic wounds and hydrogel has been reported of great performance for diabetic wound healing. Consequently, we prepared poly-N-acryloyl glycinamide (PNAGA) and introduced polyglutamic acid (γ-PGA), Fe 3+ , small extracellular vesicles (sEVs) into PNAGA to form a dual physical cross-linking supramolecular hydrogel system (PFF) for diabetic wound healing. In this study, we successfully synthesized the PFF hydrogel and extracted the sEVs that were incorporated into PPF as PPF/sEVs. In our research, we find that PFF hydrogel possessed continuous porous structure and, exceptional resilience, excellent extensibility and flexibility, closely mimicking the mechanical performance of human skin. Moreover, the PFF/sEVs hydrogel could release sEVs, playing a critical role in wound healing. Our results showed PFF/sEVs hydrogel improved the wound healing characterized by shorter wound closure time and enhanced blood vessel density in vivo. Also, sEVs counteracted the inhibitory effects of high glucose on proliferation, migration, tube differentiation, malondialdehyde (MDA) and glutathione (GSH) levels, which may attribute to the inhibition of ferroptosis by influencing free fatty acids (FFA) metabolism in vitro. Our findings indicated that the low-cost, biocompatible, and multifunctional bioactive PFF supramolecular hydrogel loaded with sEVs hold tremendous application potential as a clinical platform for diabetic wound healing.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Baozhen Li,Jun Zuo,Tiantian Liu,Mengjia Zhu,Kun Jiang,Zhuangzhuang Ren,Hua Yang,Yu Tang,Li Tan,Lizhi Wu
The mildly selective oxidation of methane to oxygenates in the aqueous phase is of great significance for methane upgrade, while it suffers low conversion and multiple oxidation products. Fe-based zeolite, especially Fe/ZSM-5 with heteroatom Al is the most widely investigated catalyst for this reaction, while the Fe supported pure Si-based zeolite without Al is rarely reported. Herein, a series of Fe-S-1 catalysts without introducing heteroatom Al is synthesized via facial dissolution-crystallization method and applied for methane selective oxidation to formic acid. The optimized 0.5Fe-S-1 shows a superior performance with the formic acid space time yield of 49751 µmol·g cat −1 ·h −1 and a liquid-phase formic acid selectivity of 93 % at 70 °C with H 2 O 2 as the oxidant, and present an excellent stability without obvious deactivation after five cycles, which outperforms all previously reported Al-free Fe/Silicalite-1 catalysts, and is comparable with conventional Fe/ZSM-5. Combined with multifarious characterizations including TEM, UV-Vis, Raman, NH 3 -TPD, Py-IR and XAS etc., two kinds of Fe species including the mononuclear tetrahedrally coordinated framework Fe 3+ species and mononuclear octahedral coordinated extra-framework Fe 3+ species are highly dispersed over Fe-S-1 even with a high Fe loading of 1.5 wt%, in which the framework Fe 3+ species content is positively correlated with the catalyst acidity and could provide acid sites to adsorb reactants and then extra-framework Fe 3+ species could activate methane/H 2 O 2 effectively. And the further EPR, in-situ FT-IR characterizations and control experiments demonstrates that the methane selective oxidation to formic acid follows a radical mechanism, in which ·CH 3 combines with ·OH or ·OOH to form CH 3 OH, and then further oxidized to HCOOH and finally over-oxidized to CO 2 .
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Light-Science & Applications
·
2022
·Vol. 11
·期 1
·1-10
·
IF 20.257
Liu Dongjie,Li Guogang,Dang Peipei,Zhang Qianqian,Wei Yi,Qiu Lei,Molokeev Maxim S.,Lian Hongzhou,Shang Mengmeng,Lin Jun
Near-infrared (NIR)-emitting phosphor-converted light-emitting diodes have attracted widespread attention in various applications based on NIR spectroscopy. Except for typical Cr 3+ -activated NIR-emitting phosphors, next-generation Cr 3+ -free NIR-emitting phosphors with high efficiency and tunable optical properties are highly desired to enrich the types of NIR luminescent materials for different application fields. Here, we report the Fe 3+ -activated Sr 2− y Ca y (InSb) 1− z Sn 2 z O 6 phosphors that exhibit unprecedented long-wavelength NIR emission. The overall emission tuning from 885 to 1005 nm with broadened full-width at half maximum from 108 to 146 nm was realized through a crystallographic site engineering strategy. The NIR emission was significantly enhanced after complete Ca 2+ incorporation owing to the substitution-induced lower symmetry of the Fe 3+ sites. The Ca 2 InSbO 6 :Fe 3+ phosphor peaking at 935 nm showed an ultra-high internal quantum efficiency of 87%. The as-synthesized emission-tunable phosphors demonstrated great potential for NIR spectroscopy detection. This work initiates the development of efficient Fe 3+ -activated broadband NIR-emitting phosphors and opens up a new avenue for designing NIR-emitting phosphor materials.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Yiming Luo,Shuo Zhang,Xinru Yang,Yang Shen,Mingxuan Liang,Yijia Lu
With advances in flexible electronics, hydrogels have found increasing use in applications such as wearable devices, soft robotics, and medical rehabilitation. However, conventional hydrogel synthesis methods remain complex and often yield structurally defective materials, hindering the optimal balance between high stretchability and high sensitivity. This limitation represents a major obstacle to practical applications. To overcome this challenge, we developed a PMVFC hydrogel featuring a double-network structure that leverages synergistic effects from three types of non-covalent bonds. The hydrogel comprised a dual-network framework of P(AM-co-VEImBr) and CMC Na, in which MBAA served as a covalent crosslinker to bridge the networks and establish a three-dimensional architecture. The carboxyl groups on CMC-Na formed hydrogen bonds with amide groups on the P(AM-co-VEImBr) backbone and also coordinated with Fe 3+ ions to generate stable ionic crosslinks. This synergistic interaction resulted in significantly enhanced mechanical properties (Stress = 0.65 MPa, Strain = 1425 %), along with improved tensile sensing performance (GF 1 = 12.27, GF 2 = 6.25, GF 3 = 5.94) and pressure sensing capability (S 1 = 0.3963 kPa −1 , S 2 = 0.0568 kPa −1 , S 3 = 0.0085 kPa −1 ). Sensors fabricated from this hydrogel successfully detected limb motion and transmitted signals using Morse code. Additionally, we created an array sensor based on the PMVFC hydrogel, providing a viable technical pathway for the development of high-performance human-machine interfaces and intelligent emergency response systems.
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CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Zhe Zhang,Congcong An,Liyun Feng,Qingfeng Yang,Ming Zhang
Heavy metal ions are increasingly accumulated in the natural environment due to growing water pollution, causing serious pollution to biological communities. Therefore, it is of great significance to study the qualitative and quantitative adsorption and detection of heavy metal ions in wastewater. Using cellulose nanofibrils (CNF)/chitosan (CS) composite as adsorbent framework, salicylaldehyde ethylenediamine Schiff base (SESB) as fluorescent and colorimetric probe, citric acid (CA) as crosslinking agent, and freeze-drying technology to prepare CNF/CS/CA/SESB composite sponge and membrane. After adsorbing Fe 3+ , the composites changes color from yellow-green to brownish-black under sunlight, and undergoes fluorescence quenching within 17 s under ultraviolet light, enabling highly sensitive, selective and reversible detection towards Fe 3+ . The composite sponge exhibits amphiphilicity and a underwater oil contact angle of 154°, which endows it with anti-fouling properties underwater. Its adsorption capacity is 438.68 mg·g −1 , and it has excellent underwater compressive elasticity as well as fluorescence and colorimetric reversibility, providing significant foundation for its application in water purification and collection. The composite membrane can be wide applied in information encryption and anti-counterfeiting fields. Predictably, CNF/CS/CA/SESB composites will offer theoretical reference for the assembly strategy of cellulose fluorescent probes, as well as their applications in detection and information encryption.
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