SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2019
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IF 2.931
Lulu Guo,Yonghai Song,Keying Cai,Li Wang
Covalent-organic frameworks (COFs) are new porous crystalline materials owning outstanding stability, adsorbability and hypotoxicity. The assembly of fluorescence probes into porous COF provides a good method for ratiometric fluorescence detection avoiding the toxic effects of fluorescence probes to the samples. Herein, a two-dimensional COF (TAPT-DHTA-COF) was employed as a host to encapsulate N-doped carbon dots (NCDs) and Rhodamine B (RhB) (NCDs-RhB@COF). NCDs and RhB were uniformly assembled into the pores of TAPT-DHTA- COF based on the hydrogen bond . The as-prepared NCDs-RhB@COF nanocomposites exhibited blue emission of NCDs at 440 nm and red emission of RhB at 570 nm at excitation of 340 nm. After the addition of Hg 2+ , the blue emission became weaker while the red emission was enhanced due to the strong coordination between NCDs-RhB@COF and Hg 2+ . This “on-off” fluorescence probe was applied in detection of trace Hg 2+ with linear range of 0.048–10 μM and detection limit of 15.9 nM together with appropriate selectivity, acceptable sensitivity and stability. The work shreds some light for COF as platform to construct ratiometric fluorescent sensor for industrial and biological application.
研究领域:
材料科学
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分析化学
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环境科学
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生物技术
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DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2023
·Vol. 140
·期 40
·1-9
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IF 3
Zhou Li,Weihang Wu,Sina Chen,Biao Xia,Tengfei Lin,Min Gao,Chunlin Zhao,Xiao Wu,Cong Lin,Weijin Yang,Yu Wang
Fluorescent hydrogels are soft materials that can emit light under certain conditions, which makes them attractive for biomedical and engineering applications. Nevertheless, one of the major challenges in developing fluorescent hydrogels is their low mechanical properties. To overcome this challenge, we have developed an efficient method for preparing high-strength and fluorescence hydrogels via freeze–thaw cycles. This approach offers a promising solution to enhance the mechanical properties of fluorescent hydrogels, which could broaden their applications in various fields. We used polyvinyl alcohol (PVA) as the main component and added 2,4,6-tri(4-aminophenyl) triazine (TAPT) as a rigid fluorescent substance. We find that these hydrogels have higher strength than conventional PVA hydrogels. These hydrogels exhibit strong fluorescence. Hydrogen bonds and π-π stacking between NH 2 and PVA construct the network structure. The composite hydrogel has significant mechanical properties, with a maximum tensile strength of 44.7 MPa, maximum elongation at break of 310.1% and Young's modulus of 138.5 MPa. Compared with the PVA hydrogel, the tensile strength and elongation at break of the hydrogel with the addition of 2% TAPT are increased by 292.6% and 153.0%, respectively. TAPT molecules are bound to the inside of the gel network, which makes the composite hydrogels have strong fluorescence. These hydrogels with high strength and fluorescence have a wide range of applications in flexible electronics and information displays.
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Manman Mu,Lingqi Meng,Siting Ma,Wenjuan Chen,Xiaohong Yin,Guoyi Bai
Covalent organic frameworks (COFs) equipped with controllable porosity and excellent structural stability are regarded as promising candidates for photocatalytic CO 2 reduction, yet some inherent drawbacks including low CO 2 activation and sluggish charge carriers’ transfer properties urgently need to be addressed. Herein, we developed an imine-bridged strategy to construct ZnO/COF heterostructure by integrating donor–acceptor COF (TAPT-DMTP COF) on the surface of amino-modified ZnO for photocatalytic CO 2 reduction. The optimal photocatalyst, N ZnO/TAPT-DMTP COF-3, exhibited superior photocatalytic activity for reducing CO 2 to CO and CH 4 , which was significantly higher than pristine COF and non-covalently bridged ZnO/TAPT-DMTP COF. Experimental and photo-electrochemical results reveal that the microstructure of TAPT-DMTP COF, interfacial imine-bridging and S-scheme heterojunction play a crucial role in promoting photoinduced charge transfer and separation, thus improving photocatalytic efficiency. Moreover, in-situ characterization and theoretical calculations indicate the photoinduced electrons transfer from N ZnO to TAPT-DMTP COF upon hybridization, and this S-scheme heterostructure dramatically lowers the energy barrier of rate-determining step from *COOH to *CO. This work provides insight into the covalent-linked COF-based S-scheme photocatalyst and highlights its vital role in enhancing CO 2 reduction.
研究领域:
材料科学
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环境科学
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化学
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DOI
PubMed
高影响因子
Analytical Methods
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2021
·Vol. 13
·期 42
·4994-5002
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IF 2.896
Hao Guo,Lei Sun,Meng Yang,Mingyue Wang,Ning Wu,Tingting Zhang,Junye Zhang,Fan Yang,Wu Yang
In this work, a covalent organic framework (COF) TAPT-TFP-COF containing a triazine ring was prepared by a typical Schiff base condensation reaction of 1,3,5-tris-(4-aminophenyl)triazine (TAPT) and 1,3,5-triformyl phloroglucinol (TFP). The TAPT-TFP-COF and carboxyl-functionalized multi-wall carbon nanotubes (COOH-MWCNTs) were drip-coated on glassy carbon electrode respectively to develop a novel and simple electrochemical sensor in order to simultaneously detect dopamine (DA) and paracetamol (PA). COOH-MWCNTs interconnected the TAPT-TFP-COF and acted as bridges between the COF particles, which had a good synergistic effect and accelerated electron transfer. Under optimal conditions, linear responses were obtained over the concentration range 1–190 μM for DA and PA with limits of detection (LOD) of 0.14 μM and 0.19 μM, respectively. Furthermore, the fabricated sensor possesses outstanding repeatability and high selectivity, and can be applied for the determination of DA and PA in dopamine injection and acetaminophen drugs with satisfactory recoveries.
研究领域:
分析化学
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材料科学
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生物医学工程
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DOI
PubMed
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2025
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IF 4.6
Qiao Yan,Pingping Zhang,Menglin Wang,Ling Ma,Ke Wang,Kaoqi Lian
This study aimed to synthesize a novel magnetic covalent organic framework (COF)-based material and establish an efficient magnetic solid-phase extraction (MSPE) method for the determination of benzimidazoles (BZDs) in honey. Given the abundant nitrogen atoms in BZDs, the target material (Fe₃O₄@SiO₂@MPA-TAPT-COF) was designed with Fe₃O₄ as the magnetic core and a COF shell polymerized from 5-bromobenzene-1,3-dicarbaldehyde (MPA) and 4,4',4''-(1,3,5-triazine-2,4,6-triyl) trianiline (TAPT). The synthesized Fe₃O₄@SiO₂@MPA-TAPT-COF exhibited considerable specific surface area, good magnetic responsiveness, and excellent reusability. An MSPE method using Fe₃O₄@SiO₂@MPA-TAPT-COF as the adsorbent was developed for the purification of BZDs in honey, followed by quantification via ultra-performance liquid chromatography–tandem mass spectrometry (UPLC-MS/MS). This method featured simple operation, high sensitivity, and good efficiency. Under optimized MSPE conditions, It showed good linearity for 17 BZDs in the concentration range of 0.2–100 μg/L, with correlation coefficients (R²) ≥ 0.9991. The limits of detection (LODs) for BZDs in honey were as low as 0.009–0.342 μg/kg. For spiked honey samples, the recoveries of the 17 target BZDs ranged from 61.44 % to 118.90 %.These results confirm that Fe₃O₄@SiO₂@MPA-TAPT-COF is a promising adsorbent for sample pretreatment, and the developed method provides a reliable tool for the sensitive and efficient analysis of BZDs in honey.
研究领域:
分析化学
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食品安全
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环境科学
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材料科学
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产品关联
DOI
高影响因子
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