SENSORS AND ACTUATORS B-CHEMICAL
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2014
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IF 3.84
Qi Huang,Yanmei Zhou,Qingyou Zhang,Enze Wang,Yinghao Min,Han Qiao,Junli Zhang,Tongsen Ma
Based on spirolactam ring-opening reaction, a chromogenic and “off–on” fluorescent sensor for determination of palladium (II) was developed in this paper. The novel sensor was easily synthesized from rhodamine B hydrazide and diacetyl monoxime named RBM. The structure of the sensor has been characterized by ESI-MS and NMR. EDTA-adding experiment indicated that the binding of chemosensor RBM and Pd 2+ was chemically reversible. The fluorescence intensity and absorbance of the sensor showed a good linearity with the concentration of Pd 2+ in the range of 0–15 μM and 0–17 μM, respectively, with detection limits of 0.015 μM and 0.200 μM. Moreover, it has been successfully applied to detect Pd 2+ in palladium-containing catalyst, natural water samples and imaging of Pd 2+ in living cells with satisfying results. The study indicated that this novel sensor could be an attractive approach to detect Pd 2+ in environmental systems and biological systems.
研究领域:
分析化学
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环境科学
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生物无机化学
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分子影像
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化学生物学
✓ 已验证
DOI
高影响因子
CATALYSIS TODAY
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2023
·
IF 5.3
Yue Hua,Jingsen Zhang,Tengda Zhang,Aimin Zhu,Guangqing Xia,Xiuling Zhang,Lanbo Di
Catalytic removal of 4-nitrophenol (4-NP) in wastewater remains a significant challenge due to the poor activity and stability of the catalysts. Herein, low-cost graphite oxide (GO) supported Pd and Ni NPs (PdNi/GO) with enhanced catalytic activity and stability for 4-NP reduction were synthesized by a plasma method in the aqueous solution of Pd(NO 3 ) 2 , Ni(NO 3 ) 2 , and GO. The normalized rate constant k nor over the PdNi/GO with Pd/Ni= 1.8:0.2 for 4-NP reduction was as high as 5480 min −1 ·g −1 ·L, which was comparable with that of Pd/GO, and it was about 50.7 times higher than that of Pd/rGO-H prepared by traditional thermal reduction method. Importantly, after six reaction cycles, it only decreased to 74.8% of the initial value, which was much higher than that of the Pd/GO catalyst (59.8%). The characterization results indicated that plasma synthesized Pd/GO catalyst can keep the oxygen-containing groups (OCGs) on the GO surface , generate abundant defects, and facilitate the adsorption of the 4-NP. Interestingly, the addition of Ni could keep these merits, and the formed PdNi alloyed structure may facilitate the electron transfer between PdNi NPs and GO, contribute to the strong adsorption of 4-NP and the rapid generation of active hydrogen. Consequently, the PdNi/GO catalyst exhibited outstanding catalytic activity and stability for 4-NP reduction. This work provided a fast, facile, environmentally friendly, and easy to scale up plasma method for synthesizing high performance Pd-based catalysts.
研究领域:
环境催化
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纳米材料
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物理化学
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水处理
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能源与环境科学
✓ 已验证
DOI
高影响因子
CARBON
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2013
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IF 5.868
Xingyun Li,Xiulian Pan,Yonghua Zhou,Xinhe Bao
A C–SiC composite with a thin layer of carbon surrounding the SiC substrate has been produced by the reaction of SiC with CCl 4 . The pore structures , graphitization levels and the chemical compositions can be finely modulated by the synthesis temperature, and atmosphere. A higher synthesis temperature accelerates the chlorination rate, increases the thickness of carbon layers and enhances their graphitization. Mesopores can be generated in C–SiC composites in comparison to predominant micropores in commercial activated carbon (AC), particularly in the presence of reactive atmosphere such as CO 2 and NH 3 . Furthermore, with cofeeding of NH 3 with CCl 4 , N heteroatoms can be incorporated into the carbon layer and the N content varies in a range of 4.7–9.5 at.%, depending on the synthesis conditions. Both increased fraction of mesopores and their sizes, as well as N doping facilitate significantly hydrogenation of 4-carboxybenzaldehyde. The activity of Pd catalyst supported on N-doped C–SiC is five times that on commercially used AC under the same conditions.
研究领域:
材料化学
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催化化学
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纳米材料
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表面科学
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多相催化
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功能材料
✓ 已验证
DOI
高影响因子
Molecular Catalysis
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2018
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IF 0
Ke Li,Ke Liu,Hong Ni,Bin Guan,Reggie Zhan,Zhen Huang,He Lin
A novel catalytic system combining oxidation catalyst with electric field was applied for low-temperature CH 4 oxidation at low CH 4 concentration (0.2% CH 4 ). Compared with conventional catalytic process, significant improvement in activity was observed over PdCeZrO x catalyst in electric field. For example, the light-off temperature (T 50 ) of CH 4 (0.2% CH 4 ) of 1 wt % PdCe 0.75 Zr 0.25 O x catalyst was approximately 255 °C in an electric field with 3 mA electric current. The impact of electric field in CH 4 oxidation over PdCeZrO x catalyst was thoroughly investigated. The XRD and XPS results revealed that electric field provided free electrons that facilitated the release of lattice oxygen in the ceria-zirconia solid solution, therefore reinforced Pd0 oxidation and the formation of palladium oxide (PdO x , x > 0) on catalyst surface. Electric field also enhanced the reducibility of the PdO x , which provided active oxygen for CH 4 oxidation at low temperature. With in-situ FTIR technique, it was found that electric field greatly promotes the chemisorption and dehydrogenation of CH 4 , thereby accelerates the chemical reactions of the intermediate products, so as to promotes CH 4 oxidation. The mechanism of catalytic oxidation of CH 4 in electric field was proposed based on comprehensive investigations above.
研究领域:
催化化学
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环境科学
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材料化学
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能源化学
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表面科学
✓ 已验证
DOI
SURFACE & COATINGS TECHNOLOGY
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2022
·
IF 4.865
Mingliang Dong,Weijin Qian,Xingzhen Liu,Yawei Chen,Weijun Huang,Changkun Dong
N-doped Carbon nanotube (NCNT)-Pd nanocomposites were fabricated by two convenient methods to make thermo-cell (TEC) electrodes. NCNTs were first synthesized on the alloy substrate (AS) using electrophoretic deposition technique, then Pd nanoparticles were coated on the surface of NCNT by magnetron sputtering. The TEC electrodes were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Raman spectroscopy, and X-ray photoelectron spectroscopy. The TEC performances of the NCNT-Pd nanocomposite electrode were enhanced significantly compared to those of the NCNT electrode with the current density of 58.4 A·m −2 and the power density of 1.08 W·m −2 , due to better catalytic activity and more activation sites. Meanwhile, the relative conversion efficiency of 1.04% was reached. This investigation suggests that the construction of the NCNT-Pd nanocomposite electrode could effectively improve the TEC performances of NCNT electrodes, very promising for the heat energy harvesting applications.
研究领域:
材料科学
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能源技术
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纳米技术
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2017
·
IF 5.401
Hong Li,Hongli Zhao,Haiyan He,Libo Shi,Xuan Cai,Minbo Lan
In this work, an ultrasensitive microelectrode for hydrogen peroxide (H 2 O 2 ) detection was constructed. The carbon fiber microelectrode (CFME) was modified with Pt-Pd nanocoral (Pt-Pd/CFME) by using a one-step electrochemical deposition method. Compared to Pt/CFME and Pd/CFME, the Pt-Pd/CFME has larger active surface area and faster electron transfer efficiency, thus exhibiting higher electrocatalytic activity for H 2 O 2 sensing. Under the optimal condition, the Pt-Pd/CFME presents fast response time (≤5 s), high selectivity (11.6 mA mM −1 cm −2 ), wide linear range (5–3920 μM) and low detection limit (0.42 μM, S/N = 3) for H 2 O 2 detection. Furthermore, the proposed sensor was successfully employed to monitor H 2 O 2 released from A549 living cells, and the detection of H 2 O 2 in milk was also realized. With the above attractive electrocatalytic properties and convenient fabrication process, the as-prepared microelectrode provides unique advantages in the monitor of H 2 O 2 in biological samples, especially in cellular environment.
研究领域:
生物化学
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分析化学
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材料科学
✓ 已验证
DOI
高影响因子
FUEL
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2016
·
IF 3.611
Xiangheng Niu,Qingang Xiong,Jianming Pan,Xin Li,Wenchi Zhang,Fengxian Qiu,Yongsheng Yan
In this work, small palladium nanoparticles (Pd NPs) inside sulfur-doped carbon microsphere (S-CMS) were synthesized to achieve both high electro-catalytic activity and long durability for methanol oxidation reaction (MOR) in direct methanol fuel cells (DMFCs). The highly dispersed Pd NPs encapsulated in S-CMS with an architectural feature like the plum pudding model were obtained via a facile one-pot hydrothermal synthesis employing reduced glutathione (r-GSH) as both reducing and capping agents, followed by a simple carbonization procedure. The synthesized Pd NPs inside S-CMS was found to provide larger effective surface for MOR compared to commercial Pd/C. Mass activity 5.9 times higher than that of Pd/C was acquired, originating from the small size of Pd NPs and their interactions with the heteroatom-modified CMS coating. Due to the decreased agglomeration and dissolution, the proposed encapsulated Pd NPs also kept more stable during continuous start-stop operation, suggesting its great potential as an effective anode material to be used in DMFCs.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
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2015
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IF 4.504
Jing-Jing Lv,Nattawadee Wisitruangsakul,Jiu-Ju Feng,Jun Luo,Ke-Ming Fang,Ai-Jun Wang
In this work, we have prepared porous PtPd alloyed nanoflowers uniformly supported on reduced graphene oxide by a simple and facile wet-chemical method, with the assistance of cytosine as a structure-directing agent. The products were mainly characterized by transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The as-prepared nanocomposites displayed improved electrocatalytic performances toward ethanol oxidation in alkaline media and oxygen reduction in acidic media, which make it a promising electrocatalyst in fuel cells.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
DOI
高影响因子
Journal of the American Chemical Society
·
2022
·
IF 16.383
Wenge Zhang,Pei-Chao Zhang,Yin-Lin Li,Hai-Hong Wu,Junliang Zhang
Asymmetric cycloaddition reactions are the most powerful tool to the expeditious construction of enantioenriched cyclic motifs in organic chemistry. In sharp contrast to well-developed cycloaddition reactions via the palladium-trimethylenemethane (Pd-TMM) intermediate, hetero (3 + 2) cycloadditions of the heteroallyl cations remain rare, largely due to their thermally forbidden nature. To the best of our knowledge, there is no example of asymmetric version leading to enantioenriched heterocycles reported so far. Herein we enabled the first example of catalytic asymmetric (3 + 2) cycloaddition of electrophilic palladium-heteroallyl zwitterion intermediate (Pd-OTMM or Pd-NTMM) with cyclic or acyclic 1,3-dienes via a pathway terminated with C–N or C–O bond formation, delivering the highly substituted or fused pyrrolidine and tetrahydrofuran rings in high yields with excellent regio-, diastereo-, and enantioselectivity. Engineering the PC-Phos, one of the chiral sulfinamide phosphine (Sadphos) type ligands, by introducing the di-tert-butyl or/and 3,5-difluorophenyl group is a vital component in achieving excellent catalytic reactivity and enantioselectivity.
研究领域:
有机化学
·
催化化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Kejian Li,Yang Yang,Aziz-Ur-Rahim Bacha,Yiqing Feng,Saira Ajmal,Iqra Nabi,Liwu Zhang
Halogenated organic compounds (HOCs) like chlorophenols (CPs) are one of persistent organic pollutants in environment, and it is an urgent issue to remove HOCs efficiently because they are detrimental to aquatic organisms and human beings. Electrocatalytic hydrodechlorination (ECH) technique has been widely studied to deal with chlorophenols. However, litter attention has been paid to the further treatment of the dechlorination product phenol. Meanwhile, photoelectrocatalysis is regarded as a promising method for contaminants elimination and water splitting using inexhaustible solar energy. Therefore, this study proposed a photoelectrochemical reductive hydrodechlorination and sequential oxidation method for thorough degradation of 2,4-dichlorophenol (2,4-DCP) using WO 3 /Mo-doped BiVO 4 as photoanode and Pd/Ni foam as cathode. Several factors such as Pd-loading amount, initial pH, overpotential, and Cl − that would influence the efficiency of 2,4-DCP hydrodechlorination and phenol oxidation have been investigated in detail. The 2,4-DCP could be completely hydrodechlorinated to phenol, and removal efficiency of the obtained phenol reached ~45% for 4 h reaction under optimized conditions. Additionally, there was no secondary chlorinated pollutant generated during the oxidation process even though the existence of Cl − . Lastly, the possible mechanism and degradation pathway were also explored based on LC-MS. This study proposed an efficient and environmental-friendly technique for complete degradation of chlorophenols, which might be also suitable for other HOCs and would be industrialized with the help of further studies.
研究领域:
环境科学
·
电化学工程
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Mengxiao Zhong,Maoqiang Chi,Yun Zhu,Ce Wang,Xiaofeng Lu
Controllable fabrication of novel and uniform noble metal nanoparticles on a specific support with a superior catalytic or electrocatalytic performance is of significantly importance for practical applications. In this report, we demonstrated an effective way to fabricate uniform thin-walled Pd/polypyrrole (PPy) hollow nanotubes . The prepared Pd/PPy hybrid nanotubes exhibited an excellent peroxidase-like activity to oxidize a typical peroxidase substrate such as 3,3′,5,5′-tetramethylbenzidine in comparison with traditional Pd/C and Pd black catalysts. The outstanding catalytic activity of the Pd/PPy hybrid nanotubes for peroxidase mimicking could be resulting from their unique hollow characteristic and an interfacial effect between PPy and Pd components. Based on the favorable catalytic property of the Pd/PPy hybrid nanotubes, a convenient and rapid colorimetric way to sensitively determine ascorbic acid has been presented. The detection limit was around 0.062 μM and an excellent selectivity was also achieved. The developed detection system in this study could be extended to the fields of bioscience and biotechnology with promising prospects.
研究领域:
生物化学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Weiguo Wang,Rongkai Du,Changzhi Dong,Jinwu Yan,Lei Zhang
A sensitive enzyme-linked immunosorbent assay (ELISA) has been developed based on the dual catalysis of dendritic Pd-Pt porous nanoparticles and horseradish peroxidase (HRP). The Pd-Pt porous nanoparticles, for the first time, were used to immobilize HRP. As a proof-of-concept demonstration, HRP functioned Pd-Pt porous nanoparticles were applied in hCG detection with a detection limit of 0.07 IU L −1 . The linear intervals is 0.1–6.4 IU L -1 . The Pd-Pt-HRP possesses a better sensitivity than the traditional BA-ELISA. Furthermore, the precision and reproducibility and selectivity were assessed to be eligible for the hCG monitoring.
研究领域:
生物化学
·
医学诊断
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）