Catalysts
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2025
·Vol. 15
·期 3
·255
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IF 4
Changhui Zhu,Xudong Zhang,Wenling Xu,Yanni Zheng,Baohe Tian,Xi Chen,Wenchao Zhu
To overcome the limitations of conventional catalysts in sterically hindered esterification reactions, a radio frequency (RF) plasma-modifiedSO42−/S2O82−/SnO2-Al2O₃ solid superacid catalyst was synthesized via sol-gel and impregnation, followed by RF plasma treatment and calcination. Comprehensive characterization revealed that the RF plasma modification endowed the catalyst with a uniform particle distribution (4.32 nm average size), larger specific surface area (104.44 m2·g−1), elevated total acid content (142.86 μmol·g−1), and increased oxygen vacancy concentration (16.4%), compared to the conventional sol-gel–impregnation–calcination-prepared catalyst. The RF plasma-modifiedSO42−-S2O82−/SnO2-Al2O3was subsequently applied to perform the esterification reaction of Tyr, with a higher steric hindrance. Mechanistic studies indicated that the plasma-induced surface etching and electronic redistribution/intensified electron-withdrawing capability ofSO42−/S2O82−groups synergistically strengthened Brønsted/Lewis acidity. For the esterification of tyrosine—a sterically demanding substrate—the modified catalyst achieved a 92.1% methyl tyrosine yield under the optimized conditions (180 °C, 0.8 MPa N2, 6 h), where the catalyst exhibited a better mechanical strength and better lifetime with five cycles. This work not only provides a scalable plasma-assisted strategy for tuning solid superacids but also establishes an eco-friendly alternative to traditional catalysts, and was applied to the esterification reactions of some high-steric-hindrance substrates.
研究领域:
催化化学
·
生物有机化学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Dandan Fang,Huizhu Ren,Yitian Huang,Hong Dai,Defu Huang,Yanyu Lin
Herein, an ultrasensitive electrochemiluminescence (ECL) immunosensor based on a high performance probe of Nb 2 CTx MXene immobilized ZnO quantum dots (QDs) was constructed for Thyroglobulin (Tg) detection. ZnO QDs with good biocompatibility and catalytic property was for the first time utilized as coreaction accelerator in Ru(bpy) 3 2+ /S 2 O 8 2− system and enhanced ECL signal. Specifically, ZnO QDs can facilitate S 2 O 8 2− reduction to generate more SO 4 − , and then reacted with cathodic radical of Ru(bpy) 3 2+ , realizing 2-fold enhancement in ECL intensity. Additionally, Nb 2 CTx MXene possesses excellent properties and was used as prominent supporter, improving the loading capacity of Ru(bpy) 3 2+ and ZnO QDs, and accelerating the electron transfer, resulting in ECL signal enhancement. Furthermore, Nb 2 CTx MXene acted as temperature controller and increased the electrode surface temperature by converting laser energy into heat, further amplified ECL signal. Because of the high sensitivity, good specificity and favorable stability, the proposed immunosensor realized sensitive detection of Thyroglobulin and had a great application prospect in bioanalysis and clinical diagnosis.
研究领域:
分析化学
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生物医学工程
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临床诊断
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DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 79
·50027-50034
·
IF 3.108
Huizhen Wang,Wenzhi Li,Jindong Wang,Hou-min Chang,Hasan Jameel,Qi Zhang,Song Li,Lele Jin
The solid, super, acid catalyst S2O82−/ZrO2–TiO2–SiO2, which has both a strong Brønsted acid and Lewis acid, was prepared and applied in lignin depolymerization. The results indicate that S2O82−/ZrO2–TiO2–SiO2 is an effective catalyst for lignin depolymerisation since the liquid product was almost completely dissolved in ethyl acetate, indicating that it was comprised of mostly oligomeric lignin degradation products. The effect of hydrogenation co-catalysts (Pd/C, Pt/C and Ru/C, Rh/C) were also studied and found to improve the yield of aromatic compounds and the petroleum ether soluble fraction, which are mostly monomeric and dimeric products. The resulting yields of aromatic compounds and petroleum ether soluble products were 14.8% and 46%, respectively, when S2O82−/ZrO2–TiO2–SiO2 and Pt/C mixed catalyst was used at 310 °C for 24 hours. These results show that the use of a combination Brønsted and Lewis acid catalyst in combination with a hydrogenation catalyst (S2O82−/ZrO2–TiO2–SiO2 together with a noble metal catalyst) opens a practical route for efficient lignin depolymerization.
研究领域:
化学工程
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催化材料
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可再生资源转化
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DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Abdul Qadir,Adeel Ahmed,Pervaiz Ahmad,Aisha H. Albalawi,Zahrah Alqahtani,Haia H. Aldosari,Raza Ullah,A. Timoumi,Awais Khalid
Metal–organic frameworks (MOFs) have currently attracted interest as effective self-sacrificial templates for the fabrication of hierarchical porous metal–nanoparticle materials. This study involved the synthesis of Cu-based MOF-loaded polyacrylonitrile (MOF/PAN) fibers using electrospinning, subsequently subjected to calcination in a nitrogen environment to yield Cu nanoparticle-loaded carbon nanorods (Cu@CNRs) as heterogeneous catalysts. The catalytic performance of prepared Cu@CNRs was investigated via hydrogen peroxide (H 2 O 2 ), peroxydisulfate (S 2 O 8 2− ), and peroxymonosulfate (HSO 5 − ) activated degradation of sulfamethoxazole (SMX). The activation performance of Cu@CNRs followed the sequence: HSO 5 − > S 2 O 8 2− > H 2 O 2 , indicating that HSO 5 − was the most effective oxidant under identical conditions. The Cu@CNR-I/HSO 5 − system demonstrated exceptional efficacy, attaining 99.99 % SMX removal in 30 min and a significant rate constant of 0.2312 min −1 . The improved activity is due to the hierarchical porous structure, elevated surface area, plentiful active sites, and robust Cu-N-C/HSO 5 − synergy. The carbonization created a polarization disparity in Cu N coordination, thereby promoting PMS activation by Cu(I/II) species. Radical quenching and EPR tests revealed that SO₄ •- and OH • radicals predominated the degradation route. The primary operating factors, such as catalyst and oxidant dose, solution pH, SMX concentration, coexisting anions, and humic acid, were carefully examined. The catalyst Cu@CNR-I exhibited remarkable catalytic stability and reusability over five cycles, indicating significant potential as a sustainable heterogeneous catalyst for wastewater treatment applications.
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Lingyan Ma,Di Wu,Lianzhe Hu,Rui Xiao,Kanglin Pei,Wenjing Qi
Phenylglyoxylic acid (PGA) as styrene metabolite is an indicator of styrene occupational exposure. In this work, a novel anodic and cathodic dual-emitting electrochemiluminescence (ECL) ratiometric method for PGA detection is developed using persulfate (S 2 O 8 2- ) and silver metal organic frameworks (Ag-MOFs) amplification strategy. PGA can enhance anodic ECL intensity of Ru(bpy) 3 2+ /PGA system nearly 2 times and cathodic ECL intensity nearly 16 times. S 2 O 8 2- and Ag-MOFs as co-reactant accelerators promote redox reaction of PGA and enhance ECL intensity. Ag + can catalyze S 2 O 8 2- to produce SO 4 ·- , which can convert Ag + to Ag 2+ . Furthermore, SO 4 ·- can accelerate the transformation of Ag + generating more Ag 2+ . Compared with Ru(bpy) 3 2+ system, cathodic ECL intensity of Ru(bpy) 3 2+ /K 2 S 2 O 8 /Ag-MOFs/PGA system gets enhanced nearly 170 times and anodic ECL intensity gets enhanced nearly 6 times. First electro-reduction and then electro-oxidation using scanning potential direction of 0→− 1.3 V→1.4 V→0 also simultaneously enhanced cathodic and anodic ECL nearly 2 times. Thus this ECL ratiometric method for PGA detection has high sensitivity with LOD of 0.8 nM and rapid response once PGA is added in an instant (several seconds). More importantly, anodic and cathodic dual-emitting improves selectivity and avoid interference in complex detection.
研究领域:
分析化学
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环境科学
·
职业健康
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产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2020
·
IF 6.785
Yamin Nie,Xiuli Tao,Ying Zhou,Xiaoding Yuan,Ying Zhuo,Ya-qin Chai,Ruo Yuan
Metal nanoclusters (NCs) have attracted extensive interest in electrochemiluminescence (ECL) field, but it is still a significant challenge to prepare high ECL efficiency NCs, which tremendously precludes their application in sensing and imaging. Herein, we report poly(3,4-ethylenedioxythiophene) (PEDOT) as a functional ligand for NCs with a “kill three birds with one stone” role, acting as a stabilizer like existing templates, excitingly, excellent electrical conductivity to accelerate the injection of interfacial electrons, and outstanding electrocatalytic activity toward coreactants (S2O82–), which breaks the convention that traditional ligands act as a double-edged sword in ECL field. As an illustration, PEDOT-hosted Ag NCs were prepared with an unprecedented ECL intensity with S2O82– as a cathodic coreactant, which indicates that this novel ligand strategy will bring exciting opportunities, not only in opening up new horizons for rational development of high ECL efficiency metal NCs but also in advancing their potential applications in light-emitting devices and clinical biosensing. As a proof of concept, the PEDOT-hosted Ag NCs were applied as neoteric ECL emitters to achieve sensitive detection of dopamine (DA), which showcased a wide linear response from 1 nM to 10 mM and a low detection limit of 0.17 nM.
研究领域:
材料科学
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分析化学
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纳米技术
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 33
·e202401481
·
IF 1.9
Mengyao Liu,Yuling Huang,Panpan Xu,Tingting Xu,Yinggui Zhu
Graphical In this paper, We developed a novel ECL sensor of the 6-MC/S 2 O 8 2− system by using 2-NSA as co-reaction accelerator. 2-NSA was first proposed as co-reaction accelerator, promoting the generation of additional oxidant SO 4 − from S 2 O 8 2− , thus amplifying the ECL signal. Moreover, this research provides a highly sensitive platform for the detection of MV. In this paper, the novel ECL sensor of the 6-methoxychromone (6-MC)/S 2 O 8 2− system was designed by using 2-naphthalene sulfonic acid (2-NSA) as a co-reaction accelerator. Fluorescence, ECL spectrum, and cyclic voltammetry (CV) were used to explore extensively the ECL mechanism of the system. It is worth pointing out that 2-naphthalene sulfonic acid (2-NSA) was first proposed as a co-reaction accelerator, reacting with the coreactant K 2 S 2 O 8 rather than the luminophore, promoting the generation of additional oxidant SO 4 − from S 2 O 8 2− , thus amplifying the ECL signal. Furthermore, under the optimal experimental conditions, the high sensitivity of the 2-naphthalene sulfonic acid (2-NSA)+6-methoxychromone (6-MC)/S 2 O 8 2− system was realized for the detection of methyl violet (MV) in the linear range of 10 −8 ~10 −2 M, with a detection limit of 5.14×10 −10 M. In addition, this find offers some guidance for further developing co-reaction accelerators with excellent performance in the future.
研究领域:
分析化学
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生物传感
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Chun Tong,Liquan Jing,Minqiang He,Meng Xie,Wei Wei,Yuanguo Xu,Hui Xu,Huaming Li
Designing a green and efficient catalyst to effectively degrade antibiotics is still one of the hot topics of research. Firstly, 1D nanorod Fe 2 O 3 /NaNbO 3 composite was successfully prepared by the two steps strategy through hydrothermal combined calcination method. In addition, the photocatalytic activity of the samples was evaluated by the degradation of tetracycline (TC) under visible light irradiation. The test results show that the 5% Fe 2 O 3 /NaNbO 3 nanorod material exhibits superior degradation rate of TC (89.4% removal efficiency in 90 min), and shows 5.62 times than that of NaNbO 3 nanorods. Under UV–visible light irradiation, 5% Fe 2 O 3 /NaNbO 3 nanorod composite with H 2 O 2 solution can degrade 97.4% of TC in 60 min, which is 12.1 times greater to that of the pure NaNbO 3 nanorods. The outstanding degradation performance may be attributed to the introduction of Fe 2 O 3 nanoparticles, which can activate H 2 O 2 more efficiently and produce more free radicals to degrade pollutants. At the same time, the 5% Fe 2 O 3 /NaNbO 3 nanorod composite can also act as an activate persulfate (PS) and generate SO 4 − to efficiently degrade TC. In addition, the catalyst also showed good performance in degrading TC in the presence of different anions and cations. Plant growth experiment ( mung bean seeds ) results showed that the degradation products have obvious lower toxicity. This study provides new domain about the designing of a photo-Fenton catalyst having dual ion synergy (Fe 3+ /Fe 2+ and Nb 5+ /Nb 4+ ) and full spectrum response.
研究领域:
环境科学
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催化材料
·
污染控制
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）