INORGANIC CHEMISTRY COMMUNICATIONS
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2026
·
IF 5.9
Changsheng Zhang,Yuxuan Hu,Haijun Liu,Xinzhong Zhang,Fengjian Luo,Zhengyun Lou,Li Zhou,Shuang Liang,Mei Yang
The detection of hazardous contaminants such as heavy metal ions and pesticide residues in water is essential for safeguarding environmental safety and public health. In this study, boron and nitrogen co-doped carbon dots (B,N-CDs) were synthesized via a one-step hydrothermal method using sodium citrate, urea, and boric acid as precursors. The as-prepared B,N-CDs demonstrated good water solubility, uniform dispersion, a maximum fluorescence emission at 445 nm, and reasonable stability. A fluorescence sensing platform based on B,N-CDs was developed for the sequential detection of Fe 3+ and phoxim using an “on-off-on” mode. The fluorescence of B,N-CDs is efficiently quenched by Fe 3+ through a static quenching mechanism (SQE); subsequent addition of phoxim restores the fluorescence due to competitive binding of phoxim with Fe 3+ . The detection limits for Fe 3+ and phoxim are 3.46 μM and 0.5 mg/L, respectively. In spiked environmental water samples, satisfactory recoveries of 82.7%–95.2% for Fe 3+ and 97.5%–112.0% for phoxim were obtained, with relative standard deviations (RSDs) below 15% ( n = 5). This study presents a promising platform for monitoring Fe 3+ and phoxim in aqueous environments.
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Advanced Optical Materials
·
2023
·Vol. 12
·期 10
·2302300
·
IF 9
Xibao Zhang,Xiudi Wu,Yonghui Xu,Shuwen Yin,Chuansheng Zhong,Liang Zhou,Hongpeng You
For near-infrared (NIR) luminescent materials, it is a challenge to develop the next generation materials with high external quantum efficiency (EQE), low toxicity, and adjustable spectrum. The transition metal ion Fe 3+ can act as a good activator and emit NIR light in oxide host lattice, but there is limited research on this topic. Herein, authors have developed a series of Fe 3+ activated A 2 BSbO 6 :yFe 3+ (A = Ca, Sr, Ba; B = Sc, Y, Ga) phosphors with a double perovskite structure, which can efficiently convert the exciting light into NIR emission in the range of 750–1200 nm with a full-width half-maximum (FWHM) of 1372−1525 cm −1 . The NIR luminescence originates from the 4 T 1 (4G)→ 6 A 1 (6S) transition of the Fe 3+ ions situated in the octahedral sites. By employing crystal field engineering, the emission spectra peak can be adjusted within the range of 842–944 nm, and the excitation spectra can be tuned from 334 to 374 nm. These spectral adjustments enable a good match between the phosphors and commercially ultraviolet chips. When excited at 334 nm, the Sr 2 ScSbO 6 :0.1%Fe 3+ phosphor demonstrates a remarkably high EQE of 54.2% and high luminescent thermostability. These characteristics make it suitable for applications in NIR spectral detection.
研究领域:
材料科学
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光学材料
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固态化学
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发光学
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光子学
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Polymers
·
2022
·Vol. 14
·期 10
·1997
·
IF 4.967
Tong Chen,Sanping Zhao
An effective strategy was developed to fabricate novel lanthanide ions–pyromellitic acid–methoxy poly(ethylene glycol) (Ln-PMA-MPEG) nano-assemblies. The amphiphilic partially esterified derivative (PMA-MPEG) of pyromellitic acid with methoxy poly(ethylene glycol) was designed and synthesized via the coupling reaction. Ln-PMA-MPEG nano-assemblies were rapidly fabricated using PMA-MPEG as a polymer ligand with Eu3+ions or mixed Eu3+/Tb3+ions through biomimetic mineralization in neutral aqueous systems. The size of the as-prepared materials could be designed in the range 80–200 nm with a uniform distribution. The materials were readily dispersed in various solvents and displayed visible color variations and different photoluminescent properties for solvent recognition. The mixed Eu/Tb-PMA-MPEG nanomaterials were investigated as ratiometric sensors for the detection of trace water in DMF and Fe3+ions in aqueous solutions. The sensor materials can quantitatively detect trace water in DMF from 0% to 10% (v/v). The resultant materials also display a strong correlation between the double luminescence intensity ratios (ITb/IEu) and Fe3+concentration, with a good linear detection concentration in the range of 0–0.24 mM and a limit of detection of 0.46 μM, and other metal ions did not interfere with the sensing mechanism for Fe3+ions. The novel nano-assemblies have potential applications as ratiometric fluorescent nanosensors in the chemical industry as well as in biomedical fields.Keywords:metal–organic frameworks;biomimetic mineralization;luminescent properties;fluorescent nanosensors
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MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2022
·Vol. 223
·期 10
·2100467
·
IF 2.996
Yun Liu,Yongmei Liu,Zhiyun Yang,Xiaoling Chen,Yansheng Zhao
Conductive hydrogels show broad prospects in wearable electronic devices. However, the conductive hydrogel cross-linked only by chemical bonds has the shortcomings of being hard and brittle, easy to break under pressure. In order to solve these problems, the MPASP-PAA/Fe 3+ composite conductive hydrogel is prepared by the method of physical and chemical double crosslinking using modified polyaspartic acid (MPASP) as the chemical crosslinking agent and FeCl 3 as the physical crosslinking agent. Compared with traditional chemical crosslinking agents such as N ′ N -methylene bisacrylamide, the MPASP can not only increase mechanical properties of the conductive hydrogel, but also improve the biodegradability and biocompatibility. At the same time, FeCl 3 as a physical crosslinking agent can also enhance the conductivity and toughness of the conductive hydrogel. When MPASP and Fe 3+ content are 2.5 wt% and 0.75 mol%, respectively, the MPASP-PAA/Fe 3+ composite conductive hydrogel exhibits high conductivity (0.12 S m −1 ), sensitivity (4.93), and stretchability (329%). In addition, its compressive strength is as high as 1081.39 KPa. The flexible strain sensor assembled by the MPASP-PAA/Fe 3+ composite conductive hydrogel can not only monitor human joint movements such as elbow and wrist bending, but also detect subtle vibrations such as vocalization and swallowing.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Yongfang Zhou,Yi Shen,Hongying Li
Electrocatalytic oxidation of biomass such as 5-hydroxymethylfurfural (HMF) is a green route to produce value-added chemicals. However, in-depth understanding of the electrocatalytic process is still lacking. Herein, the mechanism of HMF electro-oxidation was studied by operando surface-enhanced Raman spectroscopy (SERS) coupled with an Fe 3+ probe. A multicomponent platform consisting of titanium plates integrated with a gold film and uniform nickel, cobalt and copper nanoparticles (NPs) was employed as an electrode as well as a SERS substrate, enabling operando SERS study on the electrocatalytic process with simultaneous evaluation on catalytic activity and visualization on the variations of active sites. Fe 3+ was intentionally added into the electrolyte as a probe to correlate the nature of active sites with catalytic activity and product selectivity in virtue of its strong interaction with the active sites of the electrocatalysts. Electrodes integrated with Ni and Cu NPs exhibited excellent HMF oxidation performance but their activity were suppressed by adding 1 ppm Fe 3+ . Conversely, the activity towards water oxidation was significantly enhanced by Fe 3+ addition. Fe 3+ inhibits the oxidation of Ni 2+ to Ni 3+ and promotes the formation of more CuO and Cu III . Cu III is better active sites for water oxidation. The presence of Fe 3+ also inhibits the transformation of Co 3+ to Co 4+ , but it has no pronounced effects on HMF oxidation performance. A highest 2,5-furandicarboxylic acid yield (94.0%) and a maximum HMF conversion (98%) are obtained from the electrode integrated with Cu NPs at a potential of 1.47 V. HMF oxidation on Cu NPs follows the aldehyde oxidation pathway, which is not affected by Fe 3+ addition. This work could afford a feasible route to explore mechanisms of electrocatalytic processes.
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Environmental Technology & Innovation
·
2021
·
IF 5.263
Changjin Jiang,Rongtao Lyu,Ting Zhang,Zhaoguang Yang
A facile hydrothermal synthetic method was employed for the preparation of Fe 3＋ coordinated to amino-functionalized spherical mesoporous silica (Fe–NH 2 –SMS), aimed at the rapid and efficient removal of As(V) from water. The morphology, structure and properties of the adsorbent were characterized via SEM, EDS, N 2 adsorption–desorption, FT-IR, zeta-potential and XPS. Fe–NH 2 –SMS exhibited a high performance for As(V) removal with a very fast adsorption rate (reaching equilibrium within 1 min). As(V) adsorption on Fe–NH 2 –SMS was better fitted to the Langmuir isotherm model ( R 2 = 0 .988). The maximum adsorption capacity was 43.34 mg g –1 As(V) at 25 °C. The optimum pH for As(V) adsorption was in the range of 5–10. The individual presence of SO 4 2– , SO 3 2– , HPO 4 2– and CO 3 2– had a negative effect on As(V) adsorption. The removal of As(V) via Fe–NH 2 –SMS in real water samples remained above 95% with an increasing adsorbent dosage up to 1.6 g L –1 . Reusability studies indicated that the removal of As(V) was still up to 76% after five adsorption–desorption cycles. Electrostatic attraction and inner-sphere complexation between As(V) and functional groups (–NH 2
⋅
⋅
⋅ Fe 3＋ ) were identified as the adsorption mechanisms of As(V). The prepared adsorbent can be considered a promising adsorbent for the rapid adsorption of As(V) from water.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2021
·Vol. 413
·期 30
·7473-7483
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IF 4.157
Zhao Huaqi,Jin Xilang,Zhou Hongwei,Yang Zheng,Bai Haiyan,Yang Jin,Li Yulong,Ma Yiting,She Mengyao
Glutathione and 2-aminopyridine are used as carbon sources to prepare carbon dots (CDs) by a one-step hydrothermal reaction. The results show that the average particle diameter of CDs is 8.64 nm with uniform size distribution and the fluorescence quantum yield is 13.62%. We further demonstrate that novel CDs possess highly selective sensing of Fe 3+ from 0.2 to 200 μM with a low detection limit (0.194 μM). Meanwhile, the fluorescence of CDs can be repeated many times by the addition of S 2− . Moreover, the CDs are used for biological imaging of living cells with well cell penetrability and low toxicity. Furthermore, it is successfully applied for anti-counterfeiting and information encryption. More interestingly, it can be doped with hydrogel and filter paper to prepare solid-phase sensors exhibiting high sensitivity and fast response, demonstrating their tremendous potential for the simple, rapid, and low-cost monitoring of Fe 3+ and S 2− . Graphical abstract
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IONICS
·
2021
·Vol. 27
·期 11
·4907-4916
·
IF 2.817
Wang Kunjie,Chen Jinliang,Li Hongxia,Zhang Mengmeng,Liao Quanxing,Wang Letong,Zhang Yuhua,Niu Xiaohui
We have synthesized nitrogen-doped carbon quantum dots (N-CQDs) via one-step hydrothermal method by using citric acid and urea as carbon sources, In order to solve the agglomeration effect of carbon quantum dots and increase its recognition sites, and then combined the N-CQDs with 3,4,9,10-perylenetetracarboxylic acid (PTCA) to synthesize an self-assembled carbon quantum dots-3,4,9,10-perylenetetracarboxylic acid (N-CQDs/PTCA) composite, which has strong fluorescent properties. The fluorescence spectrum showed that the prepared self-assembled composite (N-CQDs/PTCA) has strong yellow-green light emission near 510 nm. The characterizations such as ultraviolet–visible absorption, X-ray electron spectroscopy, Fourier infrared spectroscopy, and transmission electron microscopy have confirmed that the N-CQDs and PTCA were combined together successfully. And the prepared self-assembled N-CQDs/PTCA was independent of excitation. It has stable and strong fluorescence properties and can be used as a fluorescent probe. The study also found that in the presence of Fe 3+ ions, the fluorescence of self-assembled carbon quantum dots N-CQDs/PTCA will be quenched, and the quenching efficiency had a good linear relationship with the concentration of Fe 3+ ions. Therefore, we proposed to use the self-assembled carbon quantum dots N-CQDs/PTCA as a fluorescent probe to detect Fe 3+ selectively. The results showed that the method was fast, reliable, obvious detection signal, selective, and not affected by incubation time. The detection limit is 0.041 μM, which provides a new idea for the detection of Fe 3+ ions by using self-assembled method and has broad application prospects. Graphical abstract
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Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 14
·3566-3575
·
IF 6.569
Libo Wang,Mohan Li,Qiu Zhang,Fengyan Li,Lin Xu
Global warming has caused us to seek a sensible strategy to replace the energy consumption of the Haber–Bosch approach in manufacturing ammonia. NH3 is utilized in agriculture to produce fertilizer to gratify the rapid increase of human food demand. Herein, we report the construction of a heterojunction that adopted g-C3N5 and Fe3+-doped W18O49 (Fe-W18O49) for photocatalytic nitrogen fixation for the first time. The surface of g-C3N5 was porous and fluffy, and its band gap energy was relatively narrow, which could adjust the absorption range of the hybrid and improve the utilization efficiency of light energy. Fe-W18O49 nanowires were rich in oxygen vacancies (OVs) that provided sufficient active sites for nitrogen adsorption and activation. The generated complex had excellent electron and hole separation ability, and the photogenerated carriers were successfully distributed to two different substances, which significantly elevated the nitrogen fixation capacity of the catalyst. The formation rate of ammonia reached 131.6 μmol g−1 h−1 when Fe-W18O49/g-C3N5 was employed as the catalyst for nitrogen fixation, which was obviously enhanced as compared with pure g-C3N5 or Fe-W18O49. This has provided the possibility to construct an inexpensive nitrogen fixation catalyst with outstanding catalytic properties.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2020
·
IF 3.232
Wenjuan Dong,Jiangyan Yu,Xiaojuan Gong,Wenting Liang,Li Fan,Chuan Dong
Many reports have suggested that near-infrared (NIR) fluorescent probes are one of the most promising molecules for improving the sensitivity of fluorescence sensing and imaging. Herein, gold nanoclusters with excellent near-infrared photoluminescence (PL) were synthesized by a simply hydrothermal treatment of hydrogen tetrachloroaurate(III) trihydrate and glutathione (GSH). The NIR PL of GSH-capped gold nanoclusters (GSH-AuNCs) can be significantly quenched by Fe 3+ , which follows a dynamic quenching mechanism. However, the NIR PL of the GSH-AuNCs/Fe 3+ system can be recovered after the addition of ascorbic acid (AA). The decrease and increase of NIR PL intensities of GSH-AuNCs were linearly correlated with the concentration of Fe 3+ and AA, respectively. Therefore, a turn-off-on NIR PL sensing strategy can be constructed for sequential detection of Fe 3+ and AA with the linear range of 0.7–180 μM and 0.5–120 μM, respectively. The proposed NIR PL sensor exhibits excellent sensing performance and has been applied to the determination of Fe 3+ and AA in real samples with satisfactory results.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Xiaofen Wang,Jiang Ma,Xirui Lu,Zhiwei Fang,Lingshuang Li,Linyan Li,Yushan Yang
Hollandite ceramics are considered as a promising host matrix for cesium immobilization. In the paper, [Cs x Ba y ][Fe 3+ 2 y + x Ti 4+ 8-2 y - x ]O 16 (0.3 ≤ x , y ≤ 0.75) ceramics were synthesized by solid-state reaction method using 133 Cs and 133 Ba as the substitutes for radioactive Cs and its daughter product Ba. It was found that the as-prepared (Cs,Ba)-hollandite solid solution shows a tetragonal structure ( I 4/m) with >90% crystallinity and good Cs retention at 1250 °C. Moreover, the normalized release rates of Cs and Ba are in the order of 10 −3 g m −2 d −1 for 28 days, exhibiting excellent aqueous durability.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
·
2019
·
IF 4.067
Sai Kumar Tammina,Yang Wan,Yanyan Li,Yaling Yang
A simple and one-step microwave digestion method was utilized to synthesize the highly photoluminescent glucosamine derived nitrogen and zinc doped carbon dots (N, Zn-CDs) with a bluish-green luminescence property. The synthesized N, Zn-CDs inherited a good photoluminescence property with a quantum yield of 74% and which were characterized by XPS , XRD , TEM , FT-IR, UV–Vis, and fluorescence spectrometry . More importantly, N, Zn-CDs served as a fluorescence sensor for the detection of Fe 3+ ions, under optimal conditions, a good linear relationship was established in the concentration range of 0.25–125 μM. Also, the experimental results showed the detection limit of N, Zn-CDs against Fe 3+ was 0.15 μM, this could be a promising assay for sensing Fe 3+ ions. Also, the role of zinc doping was explored by conducting the detection under similar experimental conditions in the absence of zinc, and reports revealed that the reason for high photoluminescence was due to the zinc doping. Along with the sensing application, our group had investigated the bactericidal property of synthesized N, Zn-CDs against gram-negative ( Escherichia coli ), and gram-positive pathogens ( Staphylococcus aureus ). N, Zn-CDs displayed good bactericidal activity against both pathogens under light conditions, but Escherichia coli , even under the dark condition proved its activity. Besides, the morphology of both the strains was displayed before and after the treatment via a scanning electron microscopic images. Also, a plausible mechanism for bactericidal activity was also explained. The reported synthesis method could provide a novel approach for the design of high photoluminescent N, Zn–CDs with good sensing and bactericidal property towards Fe 3+ ions, gram-negative and positive bacterial strains .
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