CHEMOSPHERE
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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
·
催化
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化学工程
·
材料科学
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INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
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2025
·
IF 2.5
Rong-Rong Zheng,Xiang Wu,Wen-Jia Huo,Bo-Yang Liang,Yao-Yao Bai
The conversion of lignin into high-value-added materials not only helps alleviate the energy crisis but also provides an efficient waste management solution. In this study, we present a simple extraction method of organosolv lignin from rice husks and demonstrate its application as a precursor for synthesising nitrogen and sulphur co-doped carbon quantum dots (N,S-LCQDs). The prepared N,S-LCQDs exhibited strong blue fluorescence with excellent photostability and were successfully employed as a selective fluorescent sensor for Fe3+ ions in aqueous solutions. Spectroscopic analysis revealed that the N,S-LCQDs displayed excitation-dependent emission behaviour with a quantum yield of approximately 9.7%. The fluorescence intensity of N,S-LCQDs decreased progressively with increasing Fe3+ concentration, exhibiting a good linear relationship over the range of 0–100 μM and a detection limit of 0.91 μM. The sensing mechanism was thoroughly investigated using Stern-Volmer analysis at different temperatures and fluorescence lifetime measurements. This work not only provides a sustainable approach for valorising rice husk biomass but also develops a cost-effective, sensitive, and selective fluorescent probe for Fe3+ detection in environmental and biological samples.
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JOURNAL OF MOLECULAR STRUCTURE
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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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DYES AND PIGMENTS
·
2020
·
IF 4.613
Wei Zhang,Yang Luo,Yang Zhou,Ming Liu,Weitao Xu,Bing Bian,Zhu Tao,Xin Xiao
A new fluorescent probe composed of cucurbit[10]uril (Q[10]) and a water-soluble derivative of pyrene, aminopropyl-1-pyrenebutanamide (PBA), is designated. 1 H NMR spectroscopy reveals that PBA is encapsulated into Q[10] in an aqueous solution to form a stable 1:1 host-guest inclusion complex of PBA@Q[10]. This complex behaves as a highly selective fluorescence quenching probe for Fe 3+ in aqueous solutions that may be attributed to the efficient absorption of Fe 3+ , which hindering absorption of PBA@Q[10] probe at the excitation wavelength of 332 nm, and competitive experiments for the coexistence of Fe 3+ with one or all of the other metal ions (37 metal ions) reveals that the selectivity of PBA@Q[10] to Fe 3+ is not disturbed by the addition of 50.0 equiv. of the other metal ions. The limits of detection of Fe 3+ was determined to be 0.55 mM. Furthermore, the fluorescence enhancing effect of PBA@Q[10] for Ag + is detected at the above wavelength. According to the mechanistic studies, the fluorescence enhancing route involves interaction of Ag + ions with the probe, mainly under an internal charge transfer between Ag + and the probe. Outcomes of this study suggest that PBA@Q[10] probably functions as a potential and promising fluorescence sensor for monitoring of different polluting metal ions in waste waters.
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NEW JOURNAL OF CHEMISTRY
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2019
·Vol. 44
·期 4
·1446-1454
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IF 3.069
Jin Xiao Li,Qing Lin Guan,Yu Wang,Zi Xin You,Yong Heng Xing,Feng Ying Bai,Li Xian Sun
A facile strategy was used to construct a series of composite materials with color-tunable and white light emission by encapsulating 1,3,6,8-tetrakis(p-benzoic acid)pyrene (H4TBAPy) into framework material [Eu(MCTCA)1.5(H2O)2]·1.75H2O (Eu-MCTCA), which is synthesized based on Eu(NO3)3·6H2O and 5-methyl-1-(4-carboxylphenyl)-1H-1,2,3-triazole-4-carboxylic acid (H2MCTCA). A slight adjustment of the emission color can be easily fulfilled by simply altering the concentration of H4TBAPy or regulating the excitation wavelength. Notably, white light emitting Eu-MCTCA@H4TBAPy can be realized by encapsulating H4TBAPy with a concentration of 0.75 mM, when the excitation wavelength is 350 nm. Furthermore, based on the favorable luminescence and stable structure of Eu-MCTCA@H4TBAPy in water or organic solvents, Eu-MCTCA@H4TBAPy can be used as a potential luminescent probe for detecting Fe3+, Cr2O72− and colchicine.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2019
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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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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Yan Fan,Xueqin Sun,Wenyuan Zhang,Jiacheng Liu
A novel fluorescent sensor material of Eu 3+ @ Citric acid-functionalized UiO-66 (denoted as Eu 3+ @UiO-66-CA) was prepared successfully via a two-step post synthetic modification towards UiO-66. The as-obtained Eu 3+ @UiO-66-CA presented the characteristic emission of Eu 3+ ions (λ ex = 270 nm), which could be used for rapidly detecting Fe 3+ and Cr 2 O 7 2- ions by luminescence quenching in aqueous solution. The detection process for Fe 3+ ion (detection limit, 18.1 μ M) and Cr 2 O 7 2- ion (detection limit, 8.5 μ M) exhibited the high selectivity and excellent anti-interference ability. Systematic investigations were employed to make clear the mechanism of fluorescence quenching after adding Fe 3+ and Cr 2 O 7 2- ions. Moreover, the Eu 3+ @UiO-66-CA was also used for the determination of Fe 3+ and Cr 2 O 7 2- ions in the Yellow River and tap water.
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ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Bingfang Shi,Yubin Su,Liangliang Zhang,Mengjiao Huang,Rongjun Liu,Shulin Zhao
Chemical doping with heteroatoms can effectively modulate physicochemical and photochemical properties of carbon dots (CDs). However, the development of multi heteroatoms codoped carbon nanodots is still in its early stage. In this work, a facile hydrothermal synthesis strategy was applied to synthesize multi heteroatoms (nitrogen and phosphorus) codoped carbon nanodots (N,P-CDs) using glucose as carbon source, and ammonia, phosphoric acid as dopant, respectively. Compared with CDs, the multi heteroatoms doped CDs resulted in dramatic improvement in the electronic characteristics and surface chemical activities. Therefore, the N,P-CDs prepared as described above exhibited a strong blue emission and a sensitive response to Fe3+. The N,P-CDs based fluorescent sensor was then applied to sensitively determine Fe3+ with a detection limit of 1.8 nM. Notably, the prepared N,P-CDs possessed negligible cytotoxicity, excellent biocompatibility, and high photostability. It was also applied for label-free detection of Fe3+ in complex biological samples and the fluorescence imaging of intracellular Fe3+, which indicated its potential applications in clinical diagnosis and other biologically related study.
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PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Jingqi Tian,Qian Liu,Abdullah M. Asiri,Xuping Sun,Yuquan He
Ultrathin graphitic C 3 N 4 (g-C 3 N 4 ) nanofibers about 5–10 nm in diameters have been rapidly prepared via alkali-catalyzed hydrolysis of bulk g-C 3 N 4 in concentrated alkaline aqueous solution. The morphologies of the g-C 3 N 4 nanostructures can be facilely controlled by varying reaction time, and a scissoring mechanism is proposed to explain the formation process involved. The g-C 3 N 4 nanofibers can serve as a novel fluorosensor for rapid Fe 3+ detection with high sensitivity and selectivity.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Chengyan Gao,Mantong Zhao,Shiyu Zeng,Jianfei Pei,Xinwen Wang,Chuan Li,Weimin Zhang,Zhongyuan Liu
In this study, a sandwich structure thin-film composite forward osmosis (TFC-FO) membrane based on calcium-carboxyl interfacial polymerization was synthesized using tannic acid-Fe (TA-Fe) as the interlayer. Additionally, the concentration effect of Ca 2+ surface modification, TA-Fe intermediate layers, and their combination on coconut water concentration, membrane efficiency, anti-fouling ability, and quality of the concentrate was investigated. Compared to the TFC-Ca or TFC-TA-Fe membrane, the TFC-TA-Fe-Ca membrane significantly enhanced the concentration effect and reverse salt flux ( p < 0.05) and exerted the lowest attenuation of permeability. Furthermore, the total soluble solids content increased from 5.13 °Brix to 13.17 °Brix after 8 h. The TFC-TA-Fe-Ca membrane showed a 61.20 % increase in its efficiency compared to the TFC membrane. The total reducing sugar, acids, and polyphenol contents increased by 1.72, 1.34, and 1.22 times, respectively. Overall, the sandwich structure FO membrane exhibited significant feasibility and potential for industrial application in fruit juice concentrate production.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Yu Lin,Sijun Wang,Jing Huang,Lu Chen,Tingting Bi,Luhe Qi,Ziyan Cai,Xuanyu Zeng,Pei Hu,Weimin Chen,Le Yu,Chaoji Chen
Aqueous zinc-ion batteries (AZIBs) based on hydrogel electrolytes are considered promising flexible power supplies owing to their intrinsic safety, competent volumetric energy density, and eco-friendliness. However, severe mechanical deterioration of the hydrogel electrolytes caused by insufficient inter-component contact, zinc (Zn) dendrites, and freezing prevents their commercialization. Herein, it is found that, by doping a trace of Fe 3+ ions to afford Fe 3+ -carboxylate supramolecular interaction, the practicality of an archetypal cellulose nanofiber-reinforced hydrogel electrolyte is significantly improved in a couple of aspects, including three and eight times increase in tensile strength and toughness without loss of ion conducting ability (up to 32 mS cm −1 ) and being room-temperature self-healable and strongly adhesive to various battery components. Together with the use of an anti-freezing mixed Zn salt, the resulting hydrogel electrolyte is able to deliver ultrahigh Zn cycling reversibility (averaging 99.4%), the great cyclability of AZIBs (a high specific capacity of 180 mAh g −1 and capacity retention of 81%), and render the batteries operable under severe abuse conditions of 180° folding, exposure to liquid nitrogen, and cutting–rehealing cycles. This work unlocks the enormous potential of Fe 3+ -carboxylate chemistry in the development of self-healable, anti-freezing, and extreme-environment-adaptable gel electrolytes for flexible energy storage devices.
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FOOD CHEMISTRY
·
2025
·
IF 9.8
Jinwei Tian,Yao Wei,Chengwei Lü
To achieve the development of fluorescence turn-on probe and dual detection of Al 3+ and Fe 3+ , three organic molecules (named KN , KP and KS ) were synthesized based on quinolinone, Schiff base, 1,3,4-thiadiazole or benzothiazole units. Their fluorescence characteristics and response mechanism were investigated thoroughly. The recognition process created obvious color change under sunlight and nearly 30 to 66 folds fluorescence enhancement under ultraviolet light. The formation of stable complexes leads to inhibition of intramolecular charge transfer, restriction of imine isomerization and consequent optical behaviors. For KN , Al 3+ and Fe 3+ could be distinguished via different UV–vis response or by using masking agent with detection limits of 0.18 μM and 0.20 μM, respectively. Another satisfactory result for distinguishing two ions was achieved with KS under pH = 2 or 10 condition. More importantly, KN and KS were successfully used to detect Al 3+ or Fe 3+ in foods, water samples and pharmaceutical products.
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