MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 4
·1-10
·
IF 5.3
Shan Xiangyu,Lu Juan,Li Chao,Wu Qian,Li Huiling,Yang Shuning,Guo Yanjia,Song Yujia,Li Ruidan,Tian Li
An efficient and innovative electrochemiluminescence (ECL) sensor was developed for trace detection of cyfluthrin. The sensor utilized materials such as lotus root shaped carbon fiber (Co CNFs), cadmium selenide quantum dots (CdSe QDs), and Fe 3 O 4 to amplify Ru(bpy) 3 2+ signals. Co CNFs, with its large specific surface area and porosity, served the purpose of not only enhancing the stability of the sensor by fixing CdSe QDs and Ru(bpy) 3 2+ on the Co CNFs/GCE, but also facilitating electron transfer. CdSe QDs was involved in the luminescence reaction and collaborated with Ru(bpy) 3 2+ to enhance the sensor's sensitivity, while Fe 3 O 4 promoted electron transfer in the system due to its large surface area. The solid-state ECL sensor achieved satisfactory signal under the synergistic action of these components. The ECL signal of the sensor was quenched by cyfluthrin, and a favorable linear relationship was observed between the sensor and cyfluthrin in the concentration range 1 × 10 –12 to 1 × 10 –6 M. The detection limit of the sensor was 3.3 × 10 –13 M (S/N = 3). The utilization of lotus root shaped carbon fiber, CdSe QDs, and Fe 3 O 4 in the Ru(bpy) 3 2+ system demonstrated a synergistic effect for cyfluthrin detection, presenting a new approach for the rapid determination analysis of pesticide residues in foods. Graphical
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Bo Yao,Jing Zhang,Zhenqiang Fan,Yuedi Ding,Bin Zhou,Runlin Yang,Jianfeng Zhao,Kai Zhang
The detection of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is crucial for preventing and controlling infectious diseases and disease treatment. In this work, a Au@Ti3C2@PEI-Ru(dcbpy)32+ nanocomposite-based electrochemiluminescence (ECL) biosensor was rationally designed, which realized sensitive detection of the RNA-dependent RNA polymerase (RdRp) gene of SARS-CoV-2. In addition, a DNA walker was also used to excise the hairpin DNAs under the action of Nb.BbvCI endonuclease. Furthermore, model DNA–Ag nanoclusters (model DNA–AgNCs) were used to quench the initial ECL signal. As a result, the ECL biosensor was used to sensitively detect the SARS-CoV-2 RdRp gene with a detection range of 1 fM to 100 pM and a limit of detection of 0.21 fM. It was indicated that the ECL biosensor had a great application potential for clinical medical detection. Furthermore, the DNA walker amplification also played a reliable candidate strategy for other detection methods.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
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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Reaction Kinetics Mechanisms and Catalysis
·
2018
·Vol. 125
·期 2
·789-806
·
IF 1.515
Yan Huaipu,Zhang Hong-Yu,Wang Liping,Zhang Yuecheng,Zhao Jiquan
The immobilization of ruthenium species on polyethylenimine (PEI) modified magnetic nanoparticles coated with silica afford a multifunctional catalyst (Fe 3 O 4 @SiO 2 @PEI@Ru(OH) x ) for the aerobic oxidation/Knoevenagel condensation of alcohols and active methylene compounds. A wide scope of alcohols and malononitrile could be converted to their corresponding condensation products in excellent yields under mild conditions. This catalyst has advantages of leaching-free of ruthenium species and ease of recovery by an external magnet. The activity deactivation of the catalyst was investigated and was ascribed to the transformation of surface Ru 3+ to Ru 4+ in the process of aerobic oxidation of alcohols.
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ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Wen Wu,Yuan Wu,Dong Zheng,Kai Wang,Zhenghua Tang
Developing highly active, stable, and efficient electrocatalysts for overall water splitting (OWS) is imperative to produce hydrogen with high purity. Herein, a series of Ni@Ru core-shell nanoparticles on flower-like carbon nanosheets (denoted as Ni@Ru/CNS-x, where x is the initial Ru mass loading percentage, and x = 5%, 10%, 15%) were fabricated through a facile wet chemical strategy by employing a metal-organic framework (MOF) as a sacrificial precursor. The Ni@Ru/CNS-x series was investigated to catalyze hydrogen evolution reaction (HER) in all-pH-value solutions, oxygen evolution reaction (OER) and water electrolysis in alkaline media. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) analysis revealed the Ni@Ru/CNS-x presented a three-dimensional (3D) flower-like structure composed of nanosheets with a thickness of approximately 30 nm. The resultant catalysts exhibited excellent HER, OER and OWS performance in 1.0 M KOH. Ni@Ru/CNS-10% displayed the most outstanding electrocatalytic properties , evidenced by a low overpotential of 20.1 mV and 356 mV @ 10 mA cm −2 for HER and OER in 1.0 M KOH, and outperformed stability than Pt/C and RuO 2 for HER and OER, respectively. Moreover, it exhibited a potential of 1.612 V @10 mA cm −2 in the practical OWS test, superior to both Pt/C and RuO 2 catalysts. The strategy can be extended for rational design and preparation of low cost, highly active and durable electrocatalyst with bifunctionalities for OWS and other renewable energy devices.
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BIOSENSORS & BIOELECTRONICS
·
2017
·
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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ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Wei Wei,Yu Zhao,Shichao Peng,Haoyang Zhang,Yipeng Bian,Hexing Li,Hui Li
In this paper, we develop a facile strategy for fabricating a yolk–shell structured catalytic system that consists of a core made of Ru supported on mesoporous carbon, which is encaged within a silica shell that has ordered radial mesochannels. A region-selective etching mechanism for the formation of the yolk–shell nanoarchitectures is proposed based on the stronger adsorption ability of the carbon core for etching agent than that of the silica shell for etching agent. By combining such material with amyloglucosidase, one-pot hydrolysis–hydrogenation of dextrin to sorbitol can be conducted, delivering enhanced efficiency and showing great promise for biomass conversion applications.
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FUEL
·
2024
·
IF 6.7
Junqian Wang,Yi Wang,Yuqi Wang,Xinyi Li,Caichao Wu,Tianyu Zhang,Bin Tian,Lili Qian,Yang Guo,Le Wu,Lan Zheng,Yanan Li,Xin Ding
Currently, traditional hydrodeoxygenation (HDO) catalysts have various shortcomings such as low activity levels and vulnerability to deactivation. Therefore, a series of MXene-supported Ni-M (M = Pd, Pt, Ru) bimetallic catalysts were designed and prepared. The above catalysts were also comprehensively characterized using XRD, BET, H 2 -TPR, NH 3 -TPD, XPS, SEM and TEM methods. Moreover, due to the largest particular specific surface area, moderate amount of acid sites and the strongest three-electron transfer channels between support and active metals of Ni-Pd/MXene catalyst, it exhibited the superior catalytic performance to achieve 100 % guaiacol conversion and 35.15 % highest overall yields of HDO products (Y HDO ) under the optimal reaction conditions (at 340 °C for 8 h, utilizing in-situ hydrogen source: formic acid). Furthermore, a detailed discussion on the main reaction pathways and mechanism of guaiacol HDO catalyzed by Ni-Pd/MXene was provided, an unique bimetallic synergistic “relay catalytic” theory has been proposed. Kinetic studies revealed that phenol, one of the main HDO products, is primarily generated via guaiacol demethoxylation, while catechol dehydroxylation to phenol acts as the rate-determining step. This work introduces a new strategy for the development of HDO catalysts.
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Molecular Catalysis
·
2019
·
IF 2.938
Qiaoyun Liu,Fei Liu,Yaru Zhang,Yang Su,Aiqin Wang,Tao Zhang
A highly active and robust catalyst composed of Ru nanoparticles highly dispersed on zeolite H-beta was developed for transforming furfural into 3-acetyl-1-propanol (3-AP) in good yield (81%)under mild conditions (80 °C, 1 MPa H 2 ). Both the support nature and the preparation methods had significant impacts on the dispersion of Ru, eventually on the yield of 3-AP. Ion-exchange method proved best for obtaining the highly active and selective catalyst for this reaction. Moreover, the catalyst can be regenerated easily by calcination and reduction. This catalyst was further explored for the one-pot conversion of xylose and xylan to 3-AP with a yield of 46% and 31%, respectively, thus opening a new feasible pathway from biomass to valuable fine chemicals.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Jintao Cai,Tao Chen,Liang Cui,Qiang Jia,Maosheng Liu,Rongkun Zheng,Guowen Yan,Di Wei,Jingquan Liu
Catalytic systems based on nanospheres usually show satisfied catalytic activities due to their huge specific surface areas for active sites immobilization. However, their catalytic activities are usually restricted by the absence of active sites inside the nanospheres and the inadequate communications between the interior and exterior of the nanospheres . Therefore, it can be anticipated that great improvement will be achieved if a porous three-dimensional catalytic system can be designed, through which the activity sites can be distribute interior and exterior. Herein, polydopamine (PDA) NPs with uniform sizes of 300 nm are prepared. Then, the Ru nanoclusters (Ru NCs) are uniformly generated inside and on the surface of the PDA NPs to afford the bi-nanospheres (Ru-PDA NPs). After annealing, the porous carbonized Ru-PDA NPs (Ru-cPDA-750 NPs) with electroactive nitrogen atoms are finally obtained, exhibiting small overpotential (42 mV at the current density of 10 mA cm −2 ), low value of Tafel slope (35 mV decade −1 ) and robust stability for hydrogen evolution reaction (HER), which are comparable to that of Pt/C catalyst. Moreover, the study on the effect of Ru NCs amount on electrocatalytic ability reveals that Ru-cPDA NPs loaded with 0.08 wt% of Ru NCs exhibit the best HER catalytic performance compared with the Ru-cPDA NPs loaded with other amount of Ru NCs (0.04–0.16 wt%).
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
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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FUEL
·
2024
·
IF 6.7
Zhuang Li,Zi-Chun Fan,Xiang Bai,Xian-Yong Wei,Yierxiati. Dilixiati,Qian-Qian Kong,Ji Zhao,Yong-Hui Feng,Jun-Long Wang,Xing Fan,Xiao-Yan He,Hai-Xu Zou,Zhi-Min Zong
MY zeolites with mesopores were prepared by hydrothermal method using functionalized SiO 2 (F-SiO 2 ) as a silica source, and hydrophobic bifunctional Ru/MY- O catalysts were obtained by deposition precipitation method and silylation treatment. This work aims at obtaining polycyclic alkane (PCA) based high-density hydrocarbon fuels (HDHFs). We focused on the catalytic hydroconversion (CHC) of 2-phenoxy-1-phenylethanol (PP-ol) and oxydibenzene (ODB), two typical lignin-related model compounds (LRMCs), over Ru/MY- O . The effects of different reaction conditions and catalysts on the product distribution in PP-ol and ODB were investigated. The partial hydrogenation of ODB was found to be a necessary step before achieving C-O ether bond cleavage and C-C bond coupling. The balance of metal/acidic sites is critical for maximizing PCA yields. Changes in the metal/acid ratio had a greater effect on PCA yield in PP-ol than in ODB. Poor stability of cycloalkyl cations and partial hydrogenation of ODB hinder the generation of C-C coupling products. The incorporation of mesopores and hydrophobic treatment were found to weaken the negative effects of C-C bond coupling products and water on the catalyst. The conversion of Ru 3 /MY- O was improved by nearly 10% compared to Ru 3 /Y in the fifth cycle reaction. This work provided a theoretical basis for the generation of HDHFs from lignin.
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