EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2015
·Vol. 2015
·期 28
·4731-4736
·
IF 2.942
Shuling Xu,Haibo Li,Lei Wang,Qiaoli Yue,Rui Li,Qingwang Xue,Yuanfu Zhang,Jifeng Liu
Graphical Carbon-encapsulated Cu–Ag dimetallic nanoparticles (C–CuAg NPs) were prepared using a facile one-pot route. The formation of C–CuAg NPs involved two steps: (1) the formation of the Cu–Ag alloy and (2) the in situ formation of the carbon layer at a low temperature (120 °C). The as-prepared C–CuAg NPs exhibited high catalytic activity and perfect reusability towards the reduction of 4-nitrophenol. A facile one-pot route has been developed for the synthesis of carbon-encapsulated Cu–Ag dimetallic nanoparticles (C–CuAg NPs). The synthesis was conducted using AgNO 3 and Cu(NO 3 ) 2 as metal precursors and ascorbic acid as the reduction agent and carbon source. The catalytic activities of the C–CuAg NPs for the reduction of 4-nitrophenol (4-NP) with NaBH 4 were tracked by UV/Vis spectroscopy, which demonstrates that the as-prepared C–CuAg NPs exhibit significantly enhanced catalytic activity compared with carbon-encapsulated Cu nanoparticles (C–CuNPs) and carbon-encapsulated Ag nanoparticles (C–Ag NPs). Notably, the catalysts are stable, and there is a high conversion efficiency for at least ten successive cycles. Considering the green facile preparation procedure and high catalytic activity, the prepared C–CuAg NPs hold great promise as highly efficient, cost-effective, and environmentally friendly catalysts for industrial applications.
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JOURNAL OF MATERIALS SCIENCE
·
2015
·Vol. 50
·期 9
·3399-3408
·
IF 2.371
Gao Yongju,Zhao Songfang,Zhang Guoping,Deng Libo,Li Jinhui,Sun Rong,Li Liyi,Wong Ching-Ping
Hierarchically porous organosilica microspheres have been facilely synthesized by improved self-assembly of flexible-bridged organosilica precursor without templates and harsh conditions. Subsequently, monodispersed silver nanoparticles (Ag NPs) are in situ grown on the porous microspheres via silver mirror reaction.
The as-prepared hybrid composites of Ag supported on porous microspheres are characterized by scanning electron microscopy, energy-dispersive spectroscopy, transmission electron microscopy, X-ray diffraction, thermal gravimetric analysis and nitrogen adsorption and desorption, respectively. These results indicate that not only Ag NPs (20–40 nm) are grown on the organosilica uniformly but also the content of Ag NPs immobilized in the hybrid materials can be well controlled by simply tuning the amount of the Ag(NH 3 ) 2 OH. The resultant hybrid microspheres exhibit remarkable and durable performances for the reduction of 4-nitrophenol to 4-aminophenol by NaBH 4 in aqueous solution. Moreover, the catalytic kinetic mode can be tuned by adjusting the parameter in catalytic reaction, and it can be recycled for seven successive cycles with excellent conversion of 100 % within 8 min. Therefore, the present structure design and scalable route for the synthesis of hierarchical catalyst can provide a highly efficient solution for the reduction of nitro-aromatic compounds in the view of environmentally friendly strategy.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Shaofei Zhang,Hui Yang,Ying Ma,Yu Fang
A bis-nitrobenzoxadiazole (NBD) derivative of calix[4]arene (L 1 ) and a control compound (L 2 ), mono-NBD derivative of the calixarene were designed and prepared via click chemistry. Fluorescence studies demonstrated that L 1 as created can function as a switch with the presence of Ag + in THF, of which the free state of L 1 emits at ∼527 nm, but the binding state at 576 nm. Based upon this discovery, L 1 was studied as a chemo-sensor of Ag + in a mixture solvent of THF and H 2 O with a detection limit (DL) of ∼6.2 × 10 −7 mol/L. Presence of other commonly found metal ions shows little effect upon the determination. Moreover, the L 1 in the Ag + -L 1 complex could be fully released with introduction of HCHO, a bases for the sensitive and selective detection of the toxic chemical. The DL of this test is 6.6 × 10 −7 mol/L. Interestingly, binding and releasing of the fluorescent ligand could be repeated for at least 5 times. Furthermore, both sensing could be performed in a visualized manner. It is believed that the fluorescent compound as created should have a potential to find real-life applications.
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Environmental Science-Nano
·
2017
·Vol. 4
·期 5
·1037-1044
·
IF 6.047
Wen-Jing Wang,Jun-Mei Xia,Xin Hai,Ming-Li Chen,Jian-Hua Wang
The nucleophilic substitution reaction between 4-chloro-7-nitro-2,1,3-benzoxadiazole (NBD-Cl) and –NH2 groups on amino-functionalized carbon dots (CDs) produces a novel carbon dot-based hybrid, CDs@NBD for short. In addition to the characteristic fluorescence emission of carbon dots at λex/λem = 360/443 nm, the CDs@NBD hybrid gives rise to new photoluminescence at λex/λem = 460/544 nm, which is significantly quenched by p-phenylenediamine (PPD) via static quenching. This provides a novel sensing approach for fluorometric detection of PPD with CDs@NBD as a probe. A linear calibration graph is obtained within two concentration ranges of 0.1–1.0 μmol L−1 and 1.0–10.0 μmol L−1, along with a detection limit of 56 nmol L−1 and a RSD of <3% (at 1.0 μmol L−1). The common coexisting species in environmental and biological sample matrices cause no obvious interferences on the detection of PPD. The colour change of the CDs@NBD hybrid solution with the variation in PPD concentration also facilitates visual detection of PPD, which further demonstrates promising applications in environmental and biological sample analysis.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yue Liu,Chunkai Wang,Ding Ma,Mengge Li,Yuting Sun,Xiaofei Sun,Yan Zhu,Bin Yao,Yongfeng Li,Zhanhui Ding
It is proved that secondary phases, such as Cu 2 Se, and ZnSe etc., and MoSe 2 layer can form at Cu 2 ZnSn(S,Se) 4 (CZTSSe)/Mo electrode interface, due to that Mo electrode reacts with CZTSSe and Se vapor during selenization process. The secondary phases and MoSe 2 with inappropriate thickness can decrease power conversion efficiency (PCE) of CZTSSe solar cell. In this work, a simple method was proposed to suppress the reaction between CZTSSe and Mo, and to optimize the thickness of MoSe 2 . This was achieved by growing a layer of Mo oxide in situ on the Mo electrode surface through soaking the Mo electrode in H 2 O 2 . The Mo oxide layer consisted of MoO 3 , MoO x and MoO 2 . It could suppress the reaction between Mo and CZTSSe, thus preventing the formation of secondary phases in CZTSSe. By further tuning the soaking time, the thickness and density of the Mo oxide layer were optimized, resulting in an optimized thickness of the MoSe 2 layer and a significant improvement in the contact quality at both the front and back interfaces. This improvement is beneficial for suppressing carrier recombination and reducing contact resistance. Furthermore, the Cu/(Zn+Sn) ratio in CZTSSe was optimized, leading to an expansion of the depletion region width. As a result, the reverse saturation current density and series resistance decrease, while the photogenerated current density increases. This ultimately led to a rise in PCE from 7.66% for CZTSSe solar cells with Mo electrodes that were not soaked to 8.95% for those with Mo electrodes soaked for 20 s.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Kai Yang,Zhenjie Tang,Chong Zhang,Ruide Zhang,Sheng Hu,Changjiang Lv,Jun Huang,Jiaqi Mei,Weirui Zhao,Lehe Mei
Salvianic acid A (SAA) is a catechol compound known for its diverse physiochemical functions and has significant applications in the food and pharmaceutical industries. 4-Hydroxyphenylacetate-3-hydroxylase (4HPA3H) is a critical enzyme for SAA biosynthesis, and improving its activity towards p -hydroxyphenyllactate acid (4HPLA) is essential for highly efficient SAA production in stable biosynthetic pathways. To address this, the distal site and loops of the substrate pocket were modified to improve 4HPA3H catalytic activity towards 4HPLA using computer-aided molecular modification methods. As a result, we identified and mutated two critical sites in Ec HpaB, a 4HPA3H monooxygenase from Escherichia coli : T398, a substrate loop site, and M205, a distal site. The mutants M205F, T398S, and M205F/T398S enabled 2.51-, 2.07-, and 2.20-fold increases in catalytic efficiency ( k cat / K m towards 4HPLA), respectively. Molecular dynamics simulations showed that the overall decreased flexibility of the substrate pocket loop in Ec HpaB might help improve the enzyme's catalytic activity for 4HPLA. Owing to the T398 site in the substrate pocket coming from another monomer, molecular modification of Ec HpaB with multi-monomer interactions was also worthy of attention. These findings not only enhanced the biosynthetic efficiency of SAA but also provided insights into enzyme distal site modification and the engineering of multi-monomer enzymes.
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PubMed
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 5
·1-9
·
IF 5.3
Yan Qinghua,Wu Ruixue,Wang Jiaxin,Mao Jian,Nan Wenbin
Abstract To accurately detect tumor marker carbohydrate antigen 72-4 (CA72-4) of serum samples is of great significance for the early diagnosis of malignant tumors. In the present study, MnO 2 /hollow nanobox metal-organic framework (HNM)-AuPtPd nanocomposites were prepared via multi-step synthesis and superposition method and a series of characterizations were carried out. A highly sensitive immunosensor Ab/MnO 2 /HNM-AuPtPd/GCE based on the composite nanomaterial was further prepared and used to detect the tumor marker CA72-4. The constructed immunosensor achieved signal amplification by increasing the electrocatalytic activity to H 2 O 2 by means of the synergistic effect of MnO 2 ultra-thin nanosheets (MnO 2 UNs) and HNM-AuPtPd. At the same time, the electrochemical properties of the immunosensor were analyzed using cyclic voltammetry, electrochemical impedance, amperometry (with the test voltage of −0.4 V), and differential pulse voltammetry. The experimental results showed that the MnO 2 /HNM-AuPtPd nanocomposites were successfully prepared, and the immunosensor Ab/MnO 2 /HNM-AuPtPd/GCE demonstrated an excellent electrochemical performance. The electrochemical immunosensor had the highest detection sensitivity under the optimal experimental conditions, such as incubation pH of 7.0, incubation time of 60 min, with the addition of 15 μL of H 2 O 2 , and in the concentration range 0.001–500 U/mL. It had a low detection limit of 1.78×10 −5 U/mL (S/N = 3). Moreover, the serum sample recovery were in the range from 99.38 to 100.52%. This study provides a new method and experimental basis for the detection of tumor markers in clinical practice. Graphical Abstract
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Chemical Science
·
2024
·
IF 7.6
Wei-Xing Chen,Zi-Sheng Li,Harry W. T. Morgan,Cong-Cong Shu,Zhong-Ming Sun,John E. McGrady
We report here the synthesis and characterization of two endohedral Zintl-ion clusters, [Fe4Sn18]4− and [Fe4Pb18]4−, which contain rhombic Fe4 cores. The Fe–Fe bond lengths are all below 2.5 Å, distinctly shorter than in the corresponding Cu clusters, indicating the presence of Fe–Fe bonding. Subtle differences in the structure of the Fe4 core between the two clusters suggest that the change in tetrel element causes a change in electronic ground state, with a very short Fe–Fe bond length of 2.328 Å present across the diagonal of the rhombus in the lead case.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Li Sun,Zhili Qiao,Yuan Zhi,Hua Zhang,Binlin Dou,Yuejin Shan,Weijia Huang
Bulk noble metal–semiconductor composites can be chosen as photocatalysts to carry out the flow degradation of 4-nitrophenol (4-NP) whereas their preparation is complex and uncontrollable. Here, bulk Au-Co-CoO x -CeO x @iron ball (Au/Co-CC@iron ball) is designed and prepared by a facile and controllable route without any toxic chemical. The bulk Au/Co-CC@iron ball shows excellent photocatalytic activity and reusability for the 4-NP degradation, which can be ascribed to the synergistic action of active components and foliated iron ball surface. Furthermore, the highly active Au/Co-CC@iron ball is used as packing material to construct a new-type of packed reactor, by which the flow degradation of 4-NP is successfully achieved. As-fabricated packed reactor and its tandem module exhibit superior photocatalytic performance for the flow degradation of 4-NP. Noteworthy, based on the tandem module with six reactors, the removal rate of 4-NP can reach up to 2750 µmol/h. Meanwhile, the reactor and its module display satisfactory operational stability and reusability in the flow degradation of 4-NP. Clearly, the provided route is effective for the preparation of bulk noble metal–semiconductor composites with exceptional performance, which can also be a prospective strategy to obtain bulk packing materials to serve for the flow degradation.
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DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Hongwu Gu,Wenbin Wu,Xuan-He Liu
Constructing hydrogen bonds through the heterojunction is expected be a successful tactic for achieving efficient charge separation. Here, we presented a heterojunction between 1,3,6,8-Tetra(4-carboxyphenyl) pyrene (T) and carbon nitride (CN), named T/CN. Hydrogen bonds formed between carboxyl groups of T and pyridine N in CN through the heterojunction. T/CN exhibited improved visible light absorption and enhanced charge carrier separation. The yield of CH 4 over T/CN reached up to 17.8 μmol·g −1 ·h −1 , ∼7 times higher than that of CN (2.55 μmol·g −1 ·h −1 ). This work improved the photocatalytic performance of carbon nitride by synthesizing heterojunction catalysts containing hydrogen bonds, which provided a scheme for the diversified development of heterojunction catalysts.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Linquan Dai,Bo Feng,Mengyan Tang,Yuangan Chen
It is challenging to separate between molybdenite and chalcopyrite due to their comparable hydrophobic characteristics. Inorganic depressants were previously used to separate two minerals, but the results were unsatisfactory and polluted the environment. In this study, the molybdenite and chalcopyrite were separated using a highly effective and ecologically safe depressant, 2,4-Diamino-6-hydroxypyrimidine (DAHP). According to the single mineral experiment, chalcopyrite is totally depressed while molybdenite has superior floatability. The efficacy of DAHP as the depressant was validated by further artificially mixed mineral flotation experiments, indicating the possibility of separating chalcopyrite and molybdenite. The adsorption capacity experiment results showed that the adsorption capacity of DAHP on the surface of chalcopyrite was greater than that on the surface of molybdenite. Zeta potential experiment results show that DAHP is adsorbed on the surface of chalcopyrite and molybdenite through static electrostatic interactions . X-ray photoelectron spectroscopy (XPS) experiment results show that DAHP is mainly adsorbed on chalcopyrite surface through –NH 3 + group, which hinders the adsorption of kerosene. The electrostatic contact between DAHP and molybdenite has the least effect on kerosene adsorption. This study shows that DAHP has the potential to separate chalcopyrite and molybdenite as an efficient and environmentally friendly depressant.
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Processes
·
2025
·Vol. 13
·期 1
·232
·
IF 2.8
Jiulong Che,Jian Zhang,Qing Lang,Jiayuan Yu,Yixiao Yang,Longqi Luo,Zhiyi Liu,Jiahui Ye,Gang Wang
Dual-ion batteries (DIBs) were demonstrated as a promising technology for large-scale energy storage due to their low cost, recyclability, and impressively fast charge capability. Graphite as a commonly used cathode material in DIBs, however, suffers from poor compatibility with commercial Li-ion electrolytes and graphite anodes, making it difficult to directly utilize the well-established infrastructure for Li-ion batteries. Herein, we report a small aromatic amine molecule 4,4′,4″-tris(diphenylamino)triphenylamine (N4) functioning as a compatible anion host in the EC-containing Li-ion electrolyte. With an average discharge voltage of 3.6 V (vs. Li+/Li), the N4 electrode delivers a reversible specific capacity of 108 mAh/g, which is much higher than 29 mAh/g for the graphite cathode at the same condition. The high capacity retention of 91.3% was achieved after 500 cycles at 1 A/g. The N4 electrode also exhibited good rate performance. Via different characterization techniques like Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy, the energy storage mechanism of N4 was revealed as a conversion between amine and quaternary amine cations, accompanied by PF6−(de-)insertion. As consequences, the assembled N4||graphite DIB w showed a high discharge capacity of 90 mAh/g within 1.5–4.1 V, and good cycling stability with a 98% capacity retention after 40 cycles. Decent rate performance was achieved in the N4||graphite DIB as well. This work provides new insights into designing a compatible anion host for affordable DIBs.
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