Molecular Catalysis
·
2024
·
IF 3.9
Fei Wang,Jiangge Teng,Zixu Li,Chao Fang,Kai Ma,Yanxiong Ke,Qiang Jia,Changhu Chu
A facile and readily available Fe-ppm-Pd/C catalyst has been developed for catalyzing Suzuki-Miyaura cross-coupling reactions. When combined with dicyclohexyl(2′,6′-dimethoxy-[1,1′-biphenyl]-2-yl) phosphine (SPhos), this catalyst, with low levels of palladium (as low as 180 ppm), efficiently facilitates cross-coupling reactions between aryl boronic acids (or aryl neopentyl-1,3-diol boronic ester) and a wide range of aryl halides, including inactivated aryl chlorides. Additionally, the recovered Fe-ppm-Pd/C catalyst has demonstrated sustained catalytic activity over four runs, indicating minimal decline in performance. This suggests the catalyst's potential for long-term use and its practicality in industrial applications.
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高影响因子
Nanoscale
·
2015
·Vol. 7
·期 17
·7615-7623
·
IF 7.394
Lu Lin,Tong Zhang,Haiou Liu,Jieshan Qiu,Xiongfu Zhang
Controllable encapsulation of nanoparticles with metal organic frameworks (MOFs) has been an efficient way to impart the unique chemical and physical properties of the nanoparticles to metal organic frameworks and create new types of multifunctional MOF core–shell materials with enhanced properties. Here, a novel ZnO support-induced encapsulation strategy is reported to efficiently fabricate a Pd/ZnO@ZIF-8 core–shell catalyst, with Pd/ZnO as the core and ZIF-8 as the shell. The novel synthesis procedure involves first loading Pd nanoparticles onto the surface of the ZnO microsphere to form a Pd/ZnO core and then coating the core with a layer of defect-free ZIF-8 shell via ZnO-induced in situ ZIF-8 growth to obtain the Pd/ZnO@ZIF-8 core–shell catalyst. It was crucial that the ZIF-8 was in situ formed from the ZnO core in an ethanol solution only containing 2-methylimidazole under mild conditions. This strategy allowed for the growth of ZIF-8 right on the surface of Pd/ZnO via the reaction between ZnO and the 2-methylimidazole ligands, and thus avoided the random deposition of ZIF-8 crystals on the Pd/ZnO core as in the case of the conventional ZIF-8 synthesis solution. Furthermore, use of ethanol as the solvent also favored achievement of the well-defined Pd/ZnO@ZIF-8 structure, since the ethanol solution of 2-methylimidazole was able to keep the balance between ZnO dissolution and ZIF-8 formation. The as-prepared Pd/ZnO@ZIF-8 core–shell microsphere as an efficient catalyst displayed excellent performance in terms of size-selectivity, stability and anti-poisoning in the liquid hydrogenations of alkenes.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Zhuowen Wang,Haijun Chen,Shiyi Zhao,Dapeng Liang,Deming Dong,Zhiyong Guo,Jiao Qu,Haiyang Liu,Xiuyi Hua
The extensive use of antibiotics poses a significant risk to human health, and electrocatalysis has demonstrated effectiveness in treating antibiotic contamination. This study details the synthesis of MnO 2 /Pd(OAC) 2 @CA particle electrodes using a straightforward one-step sol–gel method and the development of a three-dimensional electrocatalytic reactor (3DER) to remove antibiotics from water. Under optimal conditions (1.5 g/L MnO 2 /0.3%Pd(OAC) 2 , pH 3 and 2.0 V), a degradation of 97.8% of tetracycline hydrochloride (TCH) at a concentration of 15 mg/L is achieved within 80 min. The rate constant in the 3DER ( k = 0.0389) is 9.26 times greater than that in a two-dimensional electrocatalytic reactor (2DER) ( k = 0.0043). After ten cycles of treatment, the degradation rate of TCH remains at 86.4%. Furthermore, under optimal conditions, the energy consumption of the 3DER is significantly lower than that reported in other studies, with an EEO value of only 0.033 kWh/m 3 . Radical scavenger experiments and electron paramagnetic resonance (EPR) studies identify the free radicals involved, including •OH, SO 4 • – , H*, and •O 2 – . Theoretical calculations and toxicity assessment reveal a general reduction in the toxicity of the intermediate products formed during the electrocatalytic degradation of TCH. In summary, the MnO 2 /Pd(OAC) 2 @CA particle electrodes exhibit high electrocatalytic degradation efficiency, excellent recyclability and reusability. The 3DER constructed using particle electrodes demonstrates broad applicability and environmental friendliness, providing a novel solution for remediating antibiotic-contaminated water.
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产品关联
DOI
高影响因子
TALANTA
·
2025
·
IF 6.1
Lei Tian,Qi Guo,Luting Yan,Yuhao Zhang,Zekun Ren,Chao Wang,Xia Sun,Yemin Guo,Yanyan Zhang
Heavy metal cadmium (Cd (II)) contamination in aquatic products poses severe health risks, necessitating rapid, accurate, and portable detection methods. Traditional electrochemical sensors often suffer from background interference and low accuracy, especially when utilizing stainless steel acupuncture needles as electrodes. Single-signal systems are prone to environmental fluctuations, limiting reliability. Thus, there is an urgent need for a sensitive, low-cost, and visual sensor that integrates dual detection modes for on-site analysis of Cd (II). We report a novel ratiometric/colorimetric dual-mode aptamer sensor based on a polyaniline-gold nanocomposite (PANI@Au)-modified acupuncture needle. This platform uses PANI's peak at −0.9 V as an internal reference and His-Pd@aptamer's peak at −0.2 V as a detection signal, enabling ratiometric electrochemical quantification. In parallel, His-Pd nanoparticles catalyze the oxidation of TMB to produce a blue color, allowing visual detection with a limit of 3.10 × 10 −2 ng/L. RGB values are analyzed by a smartphone and WeChat mini-program for rapid result output. The electrochemical and colorimetric modes demonstrated excellent sensitivity (LOD: 3.40 × 10 −2 ng/L electrochemical; 1.06 × 10 −1 ng/L RGB-based) and linear range of 10 1 –10 8 ng/L. The sensor showed strong selectivity, stability, and successful application in detecting Cd (II) in fish, shrimp, and scallop samples with high recovery rates. This is the first report of a needle-based ratiometric/colorimetric aptamer sensor that enables both electrochemical quantification and smartphone-based visual detection of Cd (II). The device supports rapid, on-site, and low-skill operation with sub-100 μL samples, demonstrating its potential for real-time monitoring of heavy metal contamination in aquatic food safety.
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Fei Chai,Haoran Chen,Hongrui Xiang,Feiping Zhao,Qingwei Wang,Xiaobo Min,Liyuan Chai
Selective separation of precious metals from chloride-rich acidic media remains challenging because of the complex aqueous speciation of metal ions and the interference of competing ions. In this study, a polyethyleneimine (PEI)-functionalized tannin-based phenolic resin (TPR@PEI), enriched with O/N binding sites, was synthesized via Schiff base reactions for the selective separation and recovery of Au(III) and Pd(II) from complex acidic chloride solutions. The effects of key synthesis parameters, including tannic acid (TA) dosage, formaldehyde (FA) volume and crosslinking time, on adsorbent structure and Au(III)/Pd(II) adsorption performance were systematically investigated. Under the optimized synthesis conditions (1 g TA, 5 mL FA, and 2 h crosslinking time), TPR@PEI exhibited rapid adsorption kinetics, reaching equilibrium within 40 min for both metal ions. The adsorption behavior was well described by the pseudo-second-order kinetic model and the Langmuir isotherm model, with maximum adsorption capacities of 416.67 mg g −1 for Au(III) and 270.27 mg g −1 for Pd(II) at pH 2. More importantly, TPR@PEI showed superior selectivity toward Au(III) (> 99%) and Pd(II) (> 87%) in both binary and multicomponent systems, and maintained removal efficiencies remaining above 90% over five adsorption-desorption cycles. Combined characterization and density functional theory calculations (DFT) revealed that the excellent separation performance was governed by the synergistic effects of electrostatic attraction, redox interaction, and coordination/chelation enabled by the cooperative O/N-rich binding sites. These results demonstrate that TPR@PEI is a promising adsorbent for the highly selective separation and recovery of precious metals from complex chloride-rich acidic solutions.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Zhenxing Wang,Hongli Zhao,Kaicha Chen,Hongyuan Li,Minbo Lan
Signal amplification is crucial to improve the sensitivity for the electrochemical detection of cardiac troponin I (cTnI), one of the ideal biomarkers for early acute myocardial infarction (AMI) diagnosis. Herein, we developed a novel signal amplification strategy to construct a sandwich-type electrochemical aptasensor for the detection of cTnI. Core-shell [email protected] dendritic bimetallic nanoparticles loaded on melamine modified hollow mesoporous carbon spheres ( [email protected] DNs/NH 2 -HMCS) was prepared as labels to conjugate with thiol-modification DNA aptamers probe for signal amplification. While introducing numerous amino groups, the melamine functionalized hollow mesoporous carbon spheres (NH 2 -HMCS) retained the edge-plane-like defective sites for the adhesion and electrocatalytic reduction of H 2 O 2 . With the unique characteristics of NH 2 -HMCS, it not only enhanced the dispersity and loading capacity of core-shell [email protected] dendritic bimetallic nanoparticles ( [email protected] DNs), but also improved the stability of bonding by the affinity interaction between [email protected] DNs and amino groups of melamine. Meanwhile, the synergistic catalysis effect between [email protected] DNs and NH 2 -HMCS significantly enhanced the electrocatalytic reduction of H 2 O 2 and further amplified the signal. Under optimal conditions, this recommended aptasensor for cTnI detection displayed a wide dynamic range from 0.1 pg/mL to 100.0 ng/mL and a low detection limit of 15.4 fg/mL (S/N = 3). The sensor also successfully realized the analysis of cTnI-spiked human serum samples, meaning potential applications in AMI diagnosis.
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PubMed
高影响因子
Analytical Methods
·
2018
·Vol. 11
·期 4
·443-453
·
IF 2.073
Pramod K. Kalambate,Yankai Li,Yue Shen,Yunhui Huang
In this work, a novel highly sensitive electrochemical sensing platform has been developed for simultaneous determination of anticancer drugs doxorubicin (DOX) and dasatinib (DAS) by means of mesoporous Pd@Pt core–shell nanoparticles supported on MWCNT (Pd@Pt/MWCNT). The electrochemical behaviour of the drugs was assessed through cyclic voltammetry, while simultaneous determination was carried out using adsorptive stripping square wave voltammetry (AdSSWV). Under optimized conditions, the method exhibits linear responses towards simultaneous determination of DOX and DAS in the concentration ranges of 4.4–8580 nM and 38–9880 nM, with detection limits of 0.86 and 6.72 nM, respectively. Furthermore, the proposed platform was successfully used for reliable determination of DOX and DAS in urine and blood serum samples with good accuracy and precision. The satisfactory recoveries obtained in blood serum and urine samples showed the potential for application of the proposed platform in quality control in the pharmaceutical industry, clinical analysis and optimization of chemotherapeutic treatment. We found that the established sensor has several advantages in terms of high sensitivity and selectivity, ease of preparation, short analysis time, long-term stability and fast response.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Kok Bing Tan,Pan Tian,Xinxin Zhang,Jian Tian,Guowu Zhan,Jiale Huang,Qingbiao Li
The present study developed bifunctional catalyst for CO 2 hydrogenation into dimethyl ether (DME), whereby it consists of Pd/In 2 O 3 for CO 2 hydrogenation into methanol, and H-ZSM-5 for methanol dehydration into DME. The catalyst development was focused on the synthesis of Pd/In 2 O 3 via a green and low-cost synthesis method of carbonized alginate templating. Thus, microspherical-confined nano-Pd/In 2 O 3 was formed, whereby the localized nucleation growth was coordinated by the chemically entrapped In 3+ via ionic bond in the well-distributed alginate structure. It was found that hydrothermal temperature plays a key role in the development of this catalyst structure. The optimum hydrothermal temperature is 160 °C, as it is able to produce the highest amount of methanol. This catalyst was further integrated with H-ZSM-5 via different integration manners. It was found that mortar mixed method produces the highest amount of DME, as the close proximity causes stronger ion-exchange mechanism between the catalyst components, which facilitates higher oxygen vacancy density in the bifunctional catalyst. Under the optimum Pd/In 2 O 3 : H-ZSM-5 (PdIn-160–12: H-ZSM-5) mass ratio of 4:1, the highest STY DME of 79.7 g DME kg cat -1 h −1 with CO 2 conversion of 9% and DME selectivity of 44.1% can be achieved. In addition, the STY DME can be maintained even in 60 h on stream, demonstrating the excellent stability and performance of microspherical-confined nano-Pd/In 2 O 3 /H-ZSM-5 bifunctional catalyst synthesized via carbonized alginate templating strategy.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ming Lei,Yao Tang,Huimin Wang,Lihua Zhu,Guihua Zhang,Yu Zhou,Heqing Tang
It is still very difficult to achieve rapid cleavage of C-Cl bond of highly-chlorinated benzenes by catalytic reduction process under mild conditions. By using pentachlorobenzene (PentaCB) as a representative of highly-chlorinated benzenes, we proposed a strategy to achieve rapid and complete dechlorination of highly-chlorinated benzenes by exploiting palladium with low content deposited g-C 3 N 4 (Pd/g-C 3 N 4 ) as a catalyst with NaBH 4 as a reductant. Under favorable conditions, this strategy yielded a dechlorination efficiency of 100% for PentaCB (0.4 mmol L −1 ) in methanol solution at 30 °C within 20 min, and especially the consumption of NaBH 4 is as low as 10 mmol L −1 with a molar ratio of Cl atoms to NaBH 4 of only 1:5. A hydro-dechlorination pathway was confirmed to dominate the dechlorination of PentaCB, which involves active hydrogen species (H*) as being identified by electron spin resonance (ESR) monitoring and isotope labelling experiments. The dechlorination rate constant value of chlorobenzenes (CBs) was only a little dependent on the number of chlorine atoms and the chlorine atom with smaller steric hindrance was prior to be substituted by H*. A catalytic mechanism that Pd nanoparticles played an important role on both the weakening/breaking of C-Cl bond and the formation of active hydrogen species was further clarified: Pd exerts affinity interaction on chlorine atoms at ortho -position of CBs molecules to form adsorbed state [CBs] ads ; H* was formed on the Pd surface due to its strong ability in H* retainment; subsequently the generated H* attacks the C-Cl bond in [CBs] ads to achieve hydrodechlorination. The new method provides a highly efficient method to remove halogenated pollutants.
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高影响因子
APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Yitong Lin,Taiyu Jin,Yu Liu,Jianhe Tang,Ying Tian,Xueke Liu,Liang Chen,Dawei Fang,Jun Wang
A coated Z-scheme NaGdF 4 :Nd 3+ ,Yb 3+ ,Tm 3+ @CdS-Pd@NiO photocatalyst with core-shell structure is prepared by hydrothermal and coprecipitation methods. NaGdF 4 :Nd 3+ ,Yb 3+ ,Tm 3+ as excellent up-conversion luminescent material can convert infrared light into visible light, broadening the light response range of CdS. Pd nanorods act as conductive channels and co-catalysts, leading to successful construction of titled photocatalyst, increasing contact area between two monomer photocatalysts, promoting transfer of photo-generated electrons. It also provides a large oxidation surface for organic pollutant degradation. The performance of prepared photocatalyst is assessed by Congo red degradation and hydrogen production . The emission spectrum and energy conversion mechanism of NaGdF 4 :Nd 3+ ,Yb 3+ ,Tm 3+ are investigated. The photocatalyst with 3:1 NaGdF 4 :Nd 3+ ,Yb 3+ ,Tm 3+ @CdS-Pd and NiO mass ratio has a preeminent activity. Congo red degradation ratio and hydrogen production amount reach 92.48% and 653.06 µmol/g, respectively, under simulated sunlight irradiation for 180 min. The possible mechanism of organic pollutant degradation with synchronous hydrogen production caused by titled photocatalyst is proposed.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2017
·
IF 3.012
Mingdang Li,Ping Wang,Fubin Pei,Haoxuan Yu,Peng Chen,Yunhui Dong,Yueyun Li,Qing Liu,Degang Li
In this work, a highly sensitive sandwich-type electrochemical immunosensor was fabricated by using the gold nanorods (Au NRs) as the substrate material and the mesoporous Au@Pd@Pt core-shell nanospheres (m-Au@Pd@Pt) as the label of the detection antibodies (Ab 2 , Ab 2 label) for detecting Hepatitis B surface antigen (HBs Ag). The Au NRs with excellent conductivity and biocompatibility can accelerate the electron transfer on the electrode interface and enhance the load capacity of capture antibodies (Ab 1 ). The m-Au@Pd@Pt with mesoporous structure can not only provide high specific surface area and abundant catalytically active sites, but also offer great pore accessibility of guest species from outside. The detection signal of the immunosensor was effectively improved by the novel Ab 2 label. With the good cooperation between Au NRs and Ab 2 label, a linear relationship between current signal and the logarithm of the HBs Ag concentration was obtained in the wide range of 20 fg/mL to 200 ng/mL and the detection limit of HBs Ag was 6.7 fg/mL (signal-to-noise ratio of 3). Besides, the designed immunosensor shows good reproducibility, long-term stability and high specificity. Crucially, the sensitive and selective response to HBs Ag in real human serum samples confirms that the designed immunosensor will be promising in the clinical diagnosis of biomarkers.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2015
·
IF 7.435
Ruowen Liang,Shuiguang Luo,Fenfen Jing,Lijuan Shen,Na Qin,Ling Wu
The effective treatment of pharmaceutical and personal care products (PPCPs) contained wastewater remains a significant but challenging task for the environmental restoration. In this work, a novel Pd@MIL-100(Fe) nanocomposite has been successfully fabricated via a facile alcohol reduction approach. The resulting Pd@MIL-100(Fe) has exhibited superior photoactivity toward degradation of three typical PPCPs, that is theophylline, ibuprofen and bisphenol A, under visible light irradiation ( λ ≥ 420 nm). Its photoactivity is also much higher than that of original-MIL-100(Fe). Combining with photoelectrochemical analyses, it could be revealed that the introduction of Pd NPs would minimize the recombination of photogenerated electron–hole pairs, thereby improving the photocatalytic performance. Furthermore, the effects of different kinds of metals, the loading amount of noble-metal, the pH value of reaction solution and initial concentration of hydrogen peroxide on the photocatalytic degradation activities have been measured in detail. In addition, a possible photocatalytic reaction mechanism has been investigated. This work has not only represented the first example of using the MOFs photocatalysts to remove the aqueous PPCPs, but also offered useful information on the fabrication of efficient MOF photocatalysts for environmental restoration.
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