COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
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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JOURNAL OF SOLID STATE CHEMISTRY
·
2025
·
IF 3.5
Zhou-Cao Ye,Jie Liu,Jie Duan,Wei-Li Zhai,Xian Wang,Qing Li,Wei Zhu
Photocatalytic elimination of highly toxic Cr 2 O 7 2− and stubborn reactive dyes requires photocatalysts to exhibit both robust oxidation and reduction capabilities. However, most single MOFs must utilize ultraviolet light and are incapable of concurrently providing sufficiently negative LUCO and positive HUCO potentials. In the current contribution, a water-stable In-MOF featured by typical n-type semiconductor was assembled and subsequently integrated with the in-situ growth In 2 S 3 to construct a novel In 2 S 3 /In-MOF binary heterojunction. Notably, the intrinsic LUCO (−0.43 eV, vs. NHE) and HOCO (2.77 eV, vs. NHE) energy levels of deployed In-MOF exhibit a suitable band dislocation with In 2 S 3 's CB (−0.85 eV, vs. NHE) and VB (1.43 eV, vs. NHE) potentials. And this integration facilitates the establishment of an S-Scheme carrier transfer mechanism, effectively inhibiting carriers recombination and ensuring the efficient utilization of the robust redox abilities offered by In 2 S 3 's CB and In-MOF's HOCO. Under the driven of a low-energy xenon lamp, In 2 S 3 /In-MOF's optical-electrical properties involving photosensitiveness, photocurrent intensity and interface resistance have been notably improved. M55, with a feed mass ratio of In-MOF to In 2 S 3 at 5 : 5, achieved a 99.9 % reduction efficiency for Cr(VI) within 80 min, degradation efficiencies of 77 % and 82 % for reactive dyes RB21 and RR2 within 12 h, respectively. Its reaction kinetics have increased by 8.79, 17.82 and 14.55 times compared to the pristine In-MOF, and by 1.66, 4.60 and 17.57 times relative to pure In 2 S 3 . This contribution offers a viable avenue for designing novel MOFs-based photocatalysts, which possess robust reducing and oxidizing capabilities, to address some intractable water pollution issues.
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ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Yanqiu Zhang,Jiaxiang Liu,Xiaohan Wu,Wenquan Tao,Zhuo Li
Accurate, simple and quick detection methods for Cr(VI) detection are urgently needed for water quality monitoring. Herein, a novel and facile method of detecting Cr(VI) (Cr 2 O 7 2− /CrO 4 2− ) ions is developed via the fluorescent detection technology based on metal-organic frameworks (MOFs) doped with sulfur quantum dots (SQDs) (SQDs@UiO-66-NH 2 ). The blue-light-emitting SQDs@UiO-66-NH 2 composites exhibit excellent fluorescent properties in water environment with high quantum yield (68%) and ideal fluorescent stability, thus demonstrating excellent potential for serving as a chemical sensor. After characterizing the performance and stability of SQDs@UiO-66-NH 2 , qualitative and quantitative detection of Cr 2 O 7 2− and CrO 4 2− ions was successfully conducted. The fluorescence of SQDs@UiO-66-NH 2 composites in aqueous solution was quenched effectively with more than 90% quenching efficiency by Cr(VI) via the inner filter effect. The detection system provides considerable advantages such as rapid response (10 s), high sensitivity with a low detection limit of 0.16 μM in a broad linear range of 0–200 μM (R 2 = 0.99) for Cr 2 O 7 2− and 0.17 μM for CrO 4 2− in a broad linear range of 0–220 μM (R 2 = 0.99), high selectivity and reproducibility for at least five cycles with simple washing with alcohol. In practical applications, the sensor showed rapid response, high sensitivity and excellent recoveries (96.7%–105.4%) for detecting Cr 2 O 7 2− in real water samples. Furthermore, a SQDs@UiO-66-NH 2 -based fluorescent test paper was successfully developed, providing a simple, reliable and portable method for Cr(VI) (Cr 2 O 7 2− /CrO 4 2− ) detection in water environment.
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CRYSTENGCOMM
·
2020
·Vol. 23
·期 2
·482-491
·
IF 3.117
Lin-Hui Wu,Shu-Li Yao,Jing Li,Hui Xu,Teng-Fei Zheng,Sui-Jun Liu,Jing-Lin Chen,He-Rui Wen
A novel luminescent CdII-based metal–organic framework {[Cd(BBIP)(TBIP)]·EtOH}n (1) derived from the multidentate 5-tert-butylisophthalic acid (H2TBIP) and the semi-rigid N-donor 3,5-bis(benzimidazol-1-yl)pyridine (BBIP) has been solvothermally synthesized and structurally characterized by using infrared spectroscopy, thermal analysis, single-crystal X-ray diffraction and powder X-ray diffraction. The adjacent CdII ions are linked by two carboxylate groups of one TBIP2− ligand with chelating mode to form a one-dimensional CdII-TBIP2− chain, which is further connected by the BBIP ligand to obtain a two-dimensional network. Interestingly, the fluorescence experiments indicate that 1 could be considered as a good multi-responsive sensing material for detecting Fe3+, MnO4−, Cr2O72−, salicylaldehyde (SA) and ethylenediamine (EDA) via the turn-off effect, with the detection limits of 0.53, 0.98, 3.6, 0.42 and 5.3 ppm, respectively. The luminescence quenching effect induced by Fe3+ could be mainly ascribed to the competitive absorption mechanism. The electron-transfer transition and competitive absorption mechanism could be used to explain the luminescence quenching of MnO4− and Cr2O72−. The turn-off effect of 1 on SA could be ascribed to the photoinduced electron-transfer and competitive absorption mechanisms. Meanwhile, the possible mechanism of fluorescence quenching caused by EDA could be attributed to the structure collapse. More importantly, 1 could be regenerated and reused after five cycles for Fe3+, MnO4−, Cr2O72− and SA detection. In a nutshell, 1 could be employed as a multi-responsive luminescent sensor used for the highly selective and sensitive detection of metal ions, anions and small organic molecules.
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JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Shiman Zhang,Binghao Zhang,Jiahui Li,Liming Fan,Jiangfeng Song,Rongmei Wen
In this study, we selected the zwitterionic flexible carboxylate ligand 1,1′,1″-((2,4,6-trimethylbenzene-1,3,5-triyl)tris(methylene))tris(pyridine-1-ium-4-carboxylate) (H 3 L Br 3 ) to successfully construct a novel metal-organic framework [Eu 2 L 4 (H 2 O) 4 ]·6Br 17.5H 2 O (Eu-MOF) with a novel {4^2.6}{4^3.6.8^4.10^2}{4} topology. Remarkably, this material represents the first reported MOF to successfully accommodate both tridentate and bidentate coordination modes of ligand L, breaking through the conventional limitation of monomodal coordination observed in previous systems. Fluorescence sensing experiments demonstrate that the Eu-MOF exhibits outstanding sensing performance toward nitrobenzene (NB), Fe 3+ , and Cr 2 O 7 2− , showing excellent selectivity, high sensitivity, superior selectivity capability, and good recyclability, which enables its application as a multifunctional luminescent sensor for simultaneous detection of these three analytes. This study holds significant guiding importance for the future synthesis of innovative complexes based on such ligands and their applications in the field of fluorescence sensing.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Tian-Tian Wang,Jing-Yi Liu,Jun-Dan An,Yang-Fan Shi,Yi-Yun Zhang,Jian-Zhong Huo,Zheng-Guo Huang,Yuan-Yuan Liu,Bin Ding
Metal-organic framework (MOFs), also known as porous coordination polymers (PCPs), is a new kind of crystalline porous materials, which has received extensive attention in the past few decades. As a new type of sensing material, MOFs stand out from many other traditional fluorescence sensors because of its crystal characteristics, structural diversity, stable porosity and adjustable functional characteristics. In this work, the bi-functional building block containing aromatic carboxylic acid and triazole moieties, namely 3-(1H-1,3,4-triazol-1-yl) benzoic acid, was selected as the linker to synthesize {[Cd(µ 5 -L)⋅I} n ( 1 , HL = 3-(1H-1,3,4-triazol-1-yl)benzoic acid) by hydrothermal method with transition Cd II metal centers. Firstly, the preliminary characterization of 1 was carried out by means of PXRD, FT-IR, and then the UV and fluorescence tests were conducted to study the fluorescence properties of 1 . The crystal structure analysis indicates that Cd II is the center and the ligand is bridged to form a two-dimensional porous structure. In addition, 1 has good selectivity for Fe 3+ and Cr 2 O 7 2− , meanwhile, it has high detection sensitivity (K sv quenching efficiency for Fe 3+ : 1.2 × 10 4 M −1 and Cr 2 O 7 2− 1.85 × 10 4 M −1 ) and low detection limit (Fe 3+ : 19.21 μM and Cr 2 O 7 2− : 12.46 μM). The results of photoluminescence test show that 1 can detect cations and anions with high sensitivity, resist the interference of other ions, and have good reusability. As far as we know, 1 is the first example of ultra-stable two-dimensional (2D) Cadmium (II) microporous coordination material as a fluorescence sensor for Fe 3+ and Cr 2 O 7 2− .
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