JOURNAL OF SOLID STATE CHEMISTRY
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2020
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IF 2.726
Tao Chen,Jie Ding,Tianyu Liu,Qi Li,Yanping Luo,Longzhang Dong,Hongbin Du,Min Fang,Jianchun Bao,Yong Wu
A 3D, anionic novel porphyrinic metal-organic framework (PMOF) 1 having [NH 2 (CH 3 ) 2 ] + as counterions and Li + -exchanged version of 1 ( Li + -1 ) were synthesized. A very interesting feature of 1 and Li + -1 is their frameworks can change shape without breaking bonds, causing substantial changes of their PXRD patterns depending on what and how much is in the channels. Li + -1 has much larger surface area (Langmuir: 640 m 2 /g), compared with the 339 m 2 /g of PMOF 1 . The CO 2 adsorption capacities of 1 and Li + -1 are 38 (7.5 wt%) and 45 mL/g (8.9 wt%), respectively at 1 atm and 298 K, and 165–167 mL/g (33%) at 9.9 atm. They are direct-bandgap semiconductors with bandgaps of 1.56 (for 1 ) and 1.62 (for Li + -1 ) eV. The conduction and valence band-edge positions were determined in non-aqueous solutions as −0.29 and 1.27 ( 1 ), −0.32 and 1.30 V ( Li + -1 ) versus NHE. PMOF 1 or Li + -1 /Ru(bpy) 3 Cl 2 /TEA/CH 3 CN (bpy = 2,2-bipyridine, TEA = triethylamine) system photocatalytically reduce CO 2 to CO under visible light. PMOFs act as cocatalysts, and the photocatalysts were found to be the triplet excited state of Ru(bpy) 3 2+ ( Ru(II)∗ ) and its photodecomposition products. The TOFs contributed from PMOFs after 2 h were 0.091 and 0.097 h −1 (224 and 241 μmol g −1 h −1 ), respectively for 1 and Li + -1 , respectively. In addition, the Ru(bpy) 3 Cl 2 /TEA/CH 3 CN system were found to have an unprecedented high TOF of 0.31 h −1 (412 μmol g −1 h −1 ) when small amounts of H 2 O (200 μL H 2 O in 40 mL CH 3 CN and 10 mL TEA) was added.
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DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
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2017
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IF 7.78
Yaoguang Wang,Guanhui Zhao,Xiaojian Li,Li Liu,Wei Cao,Qin Wei
In this work, a highly-efficient competitive method-based electrochemiluminescence (ECL) immunosensor was proposed based on {[Ru(bpy) 3 ][Cu 2x Ni 2(1−x) (ox) 3 ]} n (Cu/Ni/Ru) as luminophor to efficiently detect aflatoxins B1 (AFB1). Cu/Ni/Ru exhibited excellent ECL behavior. While polyethyleneimine capped silicon dioxide (PEI@SiO 2 ) could decrease the ECL performance of Cu/Ni/Ru due that PEI could destroy the structure of Cu/Ni/Ru via producing the complex between PEI and metal ions (Cu(II)/Ni(II)), inducing the release of Ru(bpy) 3 2+ . Since Au nanoparticles can directly combine with antibody and antigen, the Cu/Ni/Ru and PEI@SiO 2 was functionalized by Au nanoparticles . The quantitative detection of AFB1 was based on the competitive binding between AFB1-bovine serum albumin labeled Au-PEI@SiO 2 (Au-PEI@SiO 2 -AFB1-BSA) and free AFB1 with antibody-AFB1 which immobilized on Au-Cu/Ni/Ru. The ECL signal increased with augmenting the concentrations of the free AFB1 due to less Au-PEI@SiO 2 -AFB1-BSA combining with antibodies. Under optimal conditions, the proposed immunosensor exhibited a wide linear range from 0.01 ng mL −1 to 100 ng mL −1 with a detection limit of 0.0039 ng mL −1 (S/N = 3). The proposed immunosensor also provides a promising approach for ultrasensitive detection of other mycotoxins .
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
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IF 3.807
Luyao Su,Jie Mao,Sui Wang,Yufang Hu
Herein, the paper developed a bimodal electrochemiluminescence (ECL) method based on dual-enhancement Ru(bpy) 3 2+ /CQDs/AA system combined with magnetic field enhanced solid-phase microextraction (MFE-SPME) for the direct determination of ascorbic acid (AA). The nanocomposite of Fe 3 O 4 @CS@GO, as a magnetic adsorbent, could efficiently extract AA under the external magnetic field provided by the magnetic glassy carbon electrode (MGCE) with the extraction efficiency up to 89.2%. Based on carbon quantum dots (CQDs) as the co-reactant for Ru(bpy) 3 2+ , when the potential was swept cyclically between −3.5 and 2.0 V, the bimodal ECL emissions were obtained in the Ru(bpy) 3 2+ /CQDs/AA system and were enhanced as AA concentration increased. The method could quantitatively detect AA, because the ln(ECL-1/ECL-2) of bimodal ECL system was in a good linear relationship with the negative logarithm of the AA concentration in the range of 10 −5 –10 −9 M with the limit of detection (LOD, S/N = 3) of 330 pM. After a series of evaluations, the method exhibited good sensitivity, satisfactory repeatability and excellent anti-interference, demonstrating that the developed method had great application potential in analysis fields.
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产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Jie Ding,Yusheng Wu,Shuyu Jia,Yuying Feng,Ke Li,Min Fang,Jianchun Bao,Yong Wu
Three 3D, anionic Cd(II) porphyrinic metal-organic frameworks (PMOFs), 1(3.5:1)-2d-120 ([Cd 3·2 (H 2 TCPP) 2 ][(CH 3 ) 2 NH 2 ] 1.6 ), its Li + -exchanged product (e.g. Li + -1-120 , formula: [Cd 3·2 (H 2 TCPP) 2 ]Li 1.6 ) and 1(10:1)-4d-120 ([Cd 3·7 H 2 TCPP) 2 ][(CH 3 ) 2 NH 2 ] 0.6 ) were synthesized, all of which have the same PXRD pattern. Their VB and CB band-edge positions were determined in nonaqueous electrolyte as −0.59, 1.12; −0.60, 1.11; and −0.60, 1.16, respectively. Their light absorption properties in the range of 250–2500 nm were obtained by UV–Vis-IR reflectance spectroscopy. Transient photocurrent responses, electrochemical impedance spectra (EIS) and solid state photoluminescence (PL) spectra of the three PMOFs were obtained. When irradiated using light of 430 nm and −0.5-0.5 bias potentials (versus Ag/Ag + electrode in CH 3 CN), both positive and negative photocurrent were observed. Mott-Schottky plot measurements indicate that they are intrinsic semiconductors. Although these three PMOFs can photocatalytically reduce CO 2 to CO in the absence of Ru (bpy) 3 Cl 2 , their catalytic abilities are very weak. The roles of these PMOFs in CH 3 CN/trimethylamine (TEA) or triethanolamine (TEOA)/H 2 O (400 μL)/Ru (bpy) 3 Cl 2 . 6H 2 O was found to be mainly cocatalysts, and Ru (bpy) 3 Cl 2 was the actual photocatalyst in the presence of small amounts of water (0–400 μL). These PMOFs act as cocatalysts due to the increased reducing power upon light irradiation . Reducing the charge of the framework can reduce the efficiencies of the photocatalytic CO 2 reduction to CO. Li + -1-120 was found to be able to react with Ru (bpy) 3 Cl 2 when sufficient amounts of H 2 O are present in CH 3 CN and TEA system, preventing the photocatalytic property of Ru (bpy) 3 Cl 2 to be released. In addition, we found that TEOA is a worse reducing agent than TEA, leading to much lower photocatalytic efficiency of the system. Mechanisms were proposed for reactions occurred in CH 3 CN/TEA (or TEOA)/H 2 O (400 μL)/Ru (bpy) 3 Cl 2 . 6H 2 O/PMOF system, and strategies to improve the photocatalytic performance of CO 2 reduction to CO were proposed.
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DOI
高影响因子
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