APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Li-juan Pang,Rong Li,Jiang-tao Hu,Lin-juan Zhang,Ming-xing Zhang,Chen-guang Yang,Guo-zhong Wu
An innovative ultrahigh molecular weight polyethylene (UHMWPE) fibrous adsorbent was successfully synthesized via radiation grafting and applied to the selective capture of palladium ions from dilute aqueous solutions. The influence of the pH, initial Pd(II) concentration, and temperature on the adsorption performance was examined in a batch adsorption experiment. Pd K-edge extended X-ray absorption fine structure (EXAFS) spectra indicated that Pd(II) was immobilized on the adsorbent surface via a ligand exchange reaction that formed a stable UHMWPE-PMDA-Pd complex. Although the concentrations of coexisting ions (Cu(II), Zn(II), Cr(VI), Fe(III), and Ni(II)) in the solution were much higher than that of Pd(II), the adsorption capacity for Pd(II) of the as-prepared absorbent was significantly greater than that for other metal ions. Kinetic studies showed good correlation with the pseudo-second-order model. The maximum capacity for Pd(II) adsorption was approximately 221.8 mg·g −1 at 298 K. The adsorption behavior conformed to the Langmuir isotherm model. Thermodynamic studies revealed that the adsorption of Pd(II) was a feasible, spontaneous, and endothermic process.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2018
·Vol. 165
·期 16
·B893
·
IF 3.662
Jingfang Hu,Ye Liu,Guowei Gao,Xiaoping Zou
One-step electrochemical approach for synthesis of AuPdNPs/ERGO nanocomposite has been developed for Cr(VI) sensing in water. The bimetallic AuPd nanoparticles and electrochemical reduced graphene oxide (ERGO) composite (AuPdNPs/ERGO) were reduced from H2PdCl4, HAuCl4 and GO mixed solution and deposited onto glass carbon electrode (GCE) through cyclic voltammetry, simultaneously. The bimetallic AuPdNPs were homogeneously modified on graphene nanosheets and characterized by scanning electron microscope (SEM), transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDX) technique. Based on the voltammetric results, the bimetallic AuPdNPs/ERGO/GCE had higher catalytic activity for Cr(VI) determination, compared with AuNPs/GCE, PdNPs/GCE and ERGO/GCE obtained by the same method. The fabricated AuPdNPs/ERGO/GCE shows good relationship in two concentration ranges from 0.05 μM to 5 μM and 5 μM to 1000 μM, with a detection of 0.013 μM (at S/N = 3). In addition, the proposed modified electrode presents high selectivity, sensitivity and stability for Cr(VI) detection and a high recovery of more than 95% was obtained towards real water application, which makes it favorable for the further practical field monitoring.
研究领域:
材料科学
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环境科学
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分析化学
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DOI
高影响因子
Small
·
2024
·Vol. 20
·期 32
·2311840
·
IF 13
Xinhua Zhao,Lingling Du,Xiaxia Xing,Zhenxu Li,Yingying Tian,Xiaoyu Chen,Xiaoyan Lang,Huigang Liu,Dachi Yang
With the recently-booming hydrogen (H 2 ) economy by green H 2 as the energy carriers and the newly-emerged exhaled diagnosis by human organ-metabolized H 2 as a biomarker, H 2 sensing is simultaneously required with fast response, low detection limit, and tolerant stability against humidity, switching, and poisoning. Here, reliable H 2 sensing has been developed by utilizing indium oxide nanocubes decorated with palladium and gold nanodots (Pd–Au NDs/In 2 O 3 NCBs), which have been synthesized by combined hydrothermal reaction, annealing, and chemical bath deposition. As-prepared Pd–Au NDs/In 2 O 3 NCBs are observed with surface-enriched NDs and nanopores. Beneficially, Pd–Au NDs/In 2 O 3 NCBs show 300 ppb-low detection limit, 5 s-fast response to 500 ppm H 2 , 75%RH-high humidity tolerance, and 56 days-long stability at 280 °C. Further, Pd–Au NDs/In 2 O 3 NCBs show excellent stability against switching sensing response, and are tolerant to H 2 S poisoning even being exposed to 10 ppm H 2 S at 280 °C. Such excellent H 2 sensing may be attributed to the synergistic effect of the boosted Pd–Au NDs’ spillover effect and interfacial electron transfer, increased adsorption sites over the porous NCBs’ surface, and utilized Pd NDs’ affinity with H 2 and H 2 S. Practically, Pd–Au NDs/In 2 O 3 NCBs are integrated into the H 2 sensing device, which can reliably communicate with a smartphone.
研究领域:
材料科学
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传感器技术
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纳米技术
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DOI
高影响因子
ANALYST
·
2013
·Vol. 138
·期 13
·3667-3672
·
IF 3.969
Junyu Wang,Fengling Song,Jingyun Wang,Xiaojun Peng
A near-infrared chemosensor for palladium based on the Tsuji–Trost reaction was developed. It displayed specific and ratiometric fluorescent responses toward palladium with a distinct color change from green to blue in aqueous media. PEG400 was employed as the reducing agent and palladium ligand instead of water-insoluble triphenylphosphine. The chemosensor's bioimaging potential was demonstrated by in vitro and in vivo experiments.
研究领域:
分析化学
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生物医学工程
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DOI
高影响因子
CHEMISTRY LETTERS
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2016
·Vol. 45
·期 7
·732-734
·
IF 1.55
Liu Xinyue,Dai Changqing,Wu Dengfeng,Fisher Adrian,Liu Zhiping,Cheng Daojian
PdAg bimetallic and PdAgCo trimetallic nanoparticles (NPs) are synthesized by a one-pot method in an organic solvent medium. Our results show that the catalytic activity of PdAgCo/C (1133.249 mA mgPd−1) for formic acid oxidation (FAO) is ca. 2.4 times larger than commercial Pd/C (483.563 mA mgPd−1) and 1.7 times larger than PdAg/C (680.741 mA mgPd−1). This study indicates that Co doping in PdAg bimetallic NPs can significantly improve its FAO activity. It is expected that the as-synthesized PdAgCo trimetallic NPs could be used as high-performance catalysts for direct formic acid fuel cells (DFAFCs).
研究领域:
材料科学
·
电化学
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DOI
高影响因子
JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Xiao-Chao Chen,Wen-Di Guo,Guo-Sheng Zhang,Long-Gen Hu,Yong Lu,Ye Liu
Pd-catalyzed hydroxycarbonylation of alkynes with CO and H 2 O is a promising alternative for one-step synthesis of α,β-unsaturated carboxylic acids advantageous with 100 % atom-economy, but suffering from rapid catalyst deactivation and unavoidable side reactions like polymerization and hydration while the auxiliary acid-additive is required as a co-catalyst. Herein, free of any auxiliary acid-additive and under mild conditions (0.5 MPa, 60 °C, 3 h), a flexible zwitterionic phosphine of L1 containing a mono-phosphino-fragment and a hydrophilic sulfonate group (–SO 3 - ) conferred to Pd(OAc) 2 catalyst efficient performance for hydroxycarbonylation of terminal alkynes, affording the branched α,β-unsaturated carboxylic acids in the yields of 85 ∼ 91 % with 100 % regioselectivity. In addition, the developed L1 -Pd(OAc) 2 system was so stable that it could be recycled for 30 runs with well-maintained activity and selectivity, which proved the most active and stable to date under acid-additive-free condition.
研究领域:
有机化学
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催化化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 11
·770
·
IF 2.8
Ni Yongjian,Wang Wentian,Tang Chen,Sun Jingyuan,Zhang Weifeng,Gao Wanlei,Jin Qinghui,Jian Jiawen,Zou Jie
The Hydrogen (H 2 ) sensor based on palladium nanogaps (Pd NGs) offers the advantages of low detection limits and fast response times. It holds significant potential for early warning of H 2 leakages. However, the preparation methods of Pd NGs for such sensors are really complex. In this study, the spray-deposition method was introduced to streamline the preparation method of Pd NGs and optimize the quantity of Pd NGs by adjusting the coverage of Pd nanoparticles (Pd NPs). The effect of different coverage of Pd NPs on the gas sensing performance of the sensor was investigated. The results revealed that sensors with lower coverage exhibited higher H 2 sensitivity. The sensor exhibited a response time of 10 s at room temperature and shorten to 2 s at 100 °C in 2500 ppm H 2 . Furthermore, the sensor achieved a detection limit as low as 50 ppm. These findings offer a method for effectively optimizing the sensing performance of Pd NGs based H 2 sensors.
研究领域:
传感器技术
·
纳米材料
·
气体传感
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功能材料
·
环境监测
✓ 已验证
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Yiyue Ding,Peng Liu,Xiaoyun Huang,Caili Hu,Zubiao Wen,Zhang-Hui Lu
Liquid sunshine formic acid (FA), which is obtainable through CO 2 hydrogenation with green H 2 or biomass processing, is regarded as a prospective liquid organic hydrogen carrier (LOHC) owing to its high volumetric capacity (53 g H 2 L −1 ), stability, and renewability. The search for effective catalysts to produce H 2 from additive-free FA under ambient conditions is necessary but remains a challenge. Herein, highly dispersed and ultrafine PdAu nanoclusters (NCs) (1.2 nm) anchored by the aminated metal–organic framework (NH 2 -MIL-101) were successfully fabricated using a facile wet-chemical method and employed as a superior catalyst for formic acid dehydrogenation (FAD). The resulting PdAu/NH 2 -MIL-101 catalyst demonstrates 100 % H 2 selectivity and superior performance with a turnover frequency value reaching 2921.0 h −1 at 323 K without any additive. Under similar conditions, this value is higher than the majority of published MOF-based FAD heterogeneous catalysts. The superior performance of PdAu/NH 2 -MIL-101 originates from a synergistic combination of the promoting effect of amino groups, the effective electronic coupling of Pd and Au, and the strong metal-support interaction between PdAu NCs and NH 2 -MIL-101, which promote the formation of reactive PdAu NCs and thus greatly improve catalytic performance. This work may provide important inspiration for developing highly efficient catalysts and strongly promote FA as a promising LOHC for chemical H 2 storage.
研究领域:
催化化学
·
能源化学
·
材料科学
✓ 已验证
DOI
高影响因子
Frontiers in Materials
·
2021
·
IF 3.515
Wu Quanlin,Zhang Gongguo,Zhao Na,Zheng Yiqun,Ma Yanyun,Liu Feng,Liu Maochang
Noble metal nanocrystals enclosed with curved surfaces are of great benefit for applications in electrocatalysis since the atomic steps and kinks on these facets have higher chemical activity. Herein, we report the fabrication of PdAg nanoshells with tunable thickness in the range of 5–13 nm and a unique concave cubic morphology, as well as the exploration of their applications for ethanol oxidation reaction (EOR) in alkaline media. The success of current work relies on the conformal deposition of PdAg on concave Au nanocubes, where the controlled reaction kinetics and proper chosen capping agent are both crucial for the growth mode. When loaded on carbon black and working as electrocatalysts, they exhibited superb electrochemical activity (e.g., 600.21 mA mg−1 in mass activity and 19.57 A m−2 in specific activity), together with improved EOR kinetics and long-term durability, as compared to Au@Pd nanoparticles and commercial Pd/C. The current work offers a feasible strategy to produce PdAg bimetallic nanocrystals with concave surface and validates their promising application as fuel cell catalysts, which could be extended to morphology engineering of other noble-metal nanocrystals for a broad range of applications.
研究领域:
材料科学
·
电化学
·
催化科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Kaifeng Wang,Song Shu,Min Chen,Junxi Li,Kai Zhou,Jian Pan,Xialing Wang,Xiangjun Li,Jianping Sheng,Fan Dong,Guangming Jiang
Electrocatalytic hydrodechlorination (EHDC) provides one promising solution to mitigate challenges from the water pollutions by persistent chlorinated organics. Palladium (Pd) has shown appealing properties as EHDC catalysts, while the low earth abundance has urged us to raise its activity and minimize usage. Herein, one novel semiconductor-metal Pd-TiO 2 Schottky heterojunction catalyst was developed, which notably outperformed the conventional Pd-C catalyst in mass activity, dechlorination degree and energy selectivity towards EHDC of 2,4-dichlorophenol (2,4-DCP) in water. A combined experimental and DFT calculation study on mechanism revealed that the primary product phenol had a considerable negative effect on EHDC by competing the active sites with 2,4-DCP. The enhanced performance of Pd-TiO 2 originated from the Schottky heterojunction-induced metal-support interactions, which optimized the Pd electronic structure and balanced the 2,4-DCP adsorption and phenol desorption on Pd. This study highlights one novel strategy to boost the metal performance in electrocatalytic hydrogenation reactions.
研究领域:
环境科学
·
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2022
·Vol. 135
·期 3
·1541-1552
·
IF 1.843
Zhang Zhenwei,Ma Xiaoshi,Yue Chuanjun,Wei Xuejiao,Liu Baoliang
Furfuryl ethyl ether (FEE), an important gasoline additive, is synthesized by a one-step reductive etherification of furfural (FF) by Nb 2 O 5 nanowires loaded with Pd as catalysts. Compared with other materials, the catalyst had a suitable synergistic effect between the reductive sites Pd 0 and the acidic sites of Nb 2 O 5 nanowires, effectively improving the yield of FEE. In ethanol, at 453 K and under 1 MPa H 2 pressure, the catalyst 1.0 wt% Pd/Nb 2 O 5 showed excellent catalytic performance in the reductive etherification reaction, and the yield of FEE reached 87.7%, higher than Pd/C whose yield was 81%. This result showed a feasible way to simplify the FEE preparation process, thus reducing production costs.
研究领域:
催化化学
·
绿色化学
·
纳米材料化学
·
能源化工
·
有机合成
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 10
·5803-5816
·
IF 6.123
Zhang Qi,Luo Yangyang,Wang Dengke,Yang Zheming,Zheng Jinxia,Xie Mali,Shao Linjun,Du Yijun,Qi Chenze
In this paper, chitosan composite nanofibers with mean diameters of 300–500 nm have been prepared by electrospinning with poly(methacrylic acid) as the crosslinking agent and poly(ethylene oxide) as the cospinning polymer. Afterwards, these composite nanofibers were annealed at temperatures ranging from 110 to 190 °C to improve their solvent resistance. Their morphologies and structures were characterized by scanning electron microscopy, infrared spectroscopy (IR) and positron annihilation life spectroscopy. These composite nanofibers were used to adsorb the Pd 2+ cations in aqueous solutions. The effects of chitosan content, annealing temperature, adsorption temperature, solution pH and initial Pd 2+ concentration were carefully studied. The adsorption result shows that these composite nanofibers had better adsorption performance than the pristine chitosan and commercial activated carbon. Under the optimized adsorption conditions, the maximum adsorption capacity was found to be 366 mg/g. The adsorption kinetic, FT-IR and XPS confirmed the chemical adsorption behavior of Pd 2+ cations on the composite nanofibers. The thermodynamic parameters (ΔG 0 , ΔH 0 and ΔS 0 ) acquired by Van’t Hoff equation indicated that the adsorption process was spontaneous and exothermic in nature. Moreover, selective adsorption study revealed that these composite nanofibers exhibited good adsorption selectivity for Pd 2+ cations from the mixture of metal ions in aqueous solution. At last, the reusability of these novel composite nanofibers was tested for four runs. Overall, this study indicated that the as-prepared nanofiber mat was an efficient adsorbent for the recovery of precious palladium cations from aqueous solutions.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）