Journal of Materials Chemistry B
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2017
·Vol. 5
·期 48
·9546-9557
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IF 4.543
Shao-Lu Li,Yaoyi Wang,Jingfang Zhang,Wei Wei,Hua Lu
We describe here a novel targeting polyion complex (Tg-PIC) system for the delivery and intracellular release of cisplatin. Briefly, a guanidinium-pendant Pt(IV)-backboned poly-prodrug termed P(DSP-Gu) is prepared with excellent aqueous solubility, high drug-loading and high potency. To enable prolonged circulation and selective cellular internalization, P(DSP-Gu) is complexed with anisamide-end-capped poly(ethylene glycol)-block-poly(L-phosphotyrosine)-block-poly(L-leucine) (AA-PEG-PpY-PLeu) to yield Tg-PIC via electrostatic coacervation. Tg-PIC is stabilized by hydrogen bonding between phosphate and guanidinium, the PEG corona, and the helical poly(L-leucine) segment forming the hydrophobic core. The anisamide group, a high affinity ligand recognizing the sigma (σ) receptors that are overexpressed on many human malignancies including prostate cancer, is incorporated at the surface of the Tg-PIC for active targeting and efficient internalization. In vitro, the Tg-PICs show targeted and efficient internalization into sigma receptor-positive PC3 cells, and can release toxic Pt(II) species due to the degradation of P(DSP-Gu) under the intracellular reducing conditions. In vivo, the Tg-PICs exhibit superior antitumor efficacy with reduced toxicity. Thus, the system holds considerable promise towards more effective and safe nanomedicine.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2024
·
IF 10.8
Huihui Wang,Qian Zhao,Daiqiang Li,Zhilin Zhang,Yuan Liu,Xueli Guo,Xiaotong Li,Zhi Liu,Lian Wang,Jinzhu Ma,Hong He
Photothermal catalysis is extremely promising for the removal of various indoor pollutants owing to its photothermal synergistic effect, while the low light utilization efficiency and unclear catalytic synergistic mechanism hinder its practical applications. Here, nitrogen atoms are introduced, and Pt nanoparticles are loaded on TiO2 to construct Pt/N-TiO2-H2, which exhibits 3.5-fold higher toluene conversion rate than the pure TiO2. Compared to both photocatalytic and thermocatalytic processes, Pt/N-TiO2-H2 exhibited remarkable performance and stability in the photothermocatalytic oxidation of toluene, achieving 98.4% conversion and 98.3% CO2 yield under a light intensity of 260 mW cm–2. Furthermore, Pt/N-TiO2-H2 demonstrated potential practical applicability in the photothermocatalytic elimination of various indoor volatile organic compounds. The synergistic effect occurs as thermocatalysis accelerates the accumulation of carboxylate species and the degradation of aldehyde species, while photocatalysis promotes the generation of aldehyde species and the consumption of carboxylate species. This ultimately enhances the photothermocatalytic process. The photothermal synergistic effect involves the specific conversion of intermediates through the interplay of light and heat, providing novel insights for the design of photothermocatalytic materials and the understanding of photothermal mechanisms.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
·
IF 4.1
Lijing Yang,Junhong Ma,Yuemei Liu,Chaoyun Ma,Xue Yu,Ziyang Meng
Preparing high-performance catalysts for oxygen reduction reaction (ORR) with low Pt loading is crucial to promote the development of clean energy storage devices such as metal air batteries. Herein, Co/ N -HCMs support material with isolated Co atoms and hollow flower-like structure could be prepared by a self-sacrificing template strategy. Co/ N -HCMs are then used to anchor Pt to obtain PtCo/ N -HCMs catalyst with low Pt loading. Thanks to its improved specific surface area, hierarchical porous structure, and reinforced metal-support interactions, the obtained PtCo/ N -HCMs deliver high onset potential of 0.99 V and half-wave potential of 0.82 V, and an excellent durability. When used as air cathode catalyst, PtCo/ N -HCMs-based Zinc-air battery (ZAB) exhibits a power density of up to 202 mW cm −2 , which is significantly better than ZAB assembled with commercial Pt/C. This study provides an effective strategy for preparing high-performance electrocatalysts with low precious metal content for use as the cathode of metal-air batteries.
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RSC Advances
·
2015
·Vol. 5
·期 56
·45420-45425
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IF 3.84
Xiuchun Li,Cailin Liu,Kezhen Gou,Haijun Yang,Xianyan Ren,Bihui Peng
Pt/SDB hydrophobic catalysts, platinum supported on a cross-linked styrene-divinyl benzene copolymer (SDB), were prepared by an impregnating method. The results indicated that the content of the residual double bonds was positively proportional to the amount of divinyl benzene (DVB) and negatively proportional to the amount of initiator. When the molar ratio of DVB to St was 1 : 1, the content of the residual double bonds reached a highest value of 1.248 mmol g−1. The influences of the contents of residual double bonds on the loading amounts of Pt, as well as the catalytic activity and stability of Pt/SDB catalysts were investigated. Performance tests demonstrated that the loading amounts of Pt increased correspondingly, as the contents of residual double bonds increased. Moreover, Pt/SDB with a higher content of residual double bonds generally had a higher column efficiency and a better stability. Interestingly, the column efficiencies of Pt/SDB with a highest content of residual double bond were all above 90% under all experiment conditions.
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Catalysis Science & Technology
·
2024
·Vol. 14
·期 14
·4058-4067
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IF 4.4
Yang You,Aijie Xu,Yao Lv,Lide Yang,Xuan Tang,Jie Tang,Yanglong Guo,Yao Cui,Wangcheng Zhan,Li Wang,Yun Guo,Sheng Dai
Complete oxidation of propane has drawn great attention in the fields of automotive emission control and volatile organic compound elimination. However, it is challenging to achieve high activity of this reaction due to the stability of propane. We here utilize a facile solvothermal method to construct tri-coordinated Al (AlIII) sites on the as-synthesized ST-Al2O3 support to alter the properties of supported Pt species. It is demonstrated that AlIII sites facilitate the dispersion and electron enrichment of supported Pt sites. Thus, Pt/ST-Al2O3 exhibits a superior activity toward complete propane oxidation, showing a 6.7-fold improvement in the turnover frequency over commercial Pt/Al2O3 catalysts. Meanwhile, Pt/ST-Al2O3 possesses a distinct reaction route originating from its stronger C–H and C–C cleavage capability, while having excellent activity not only in complete propane oxidation but also in the complete oxidation of other alkanes (CH4, C2H6, and n-C4H10). In addition, the AlIII construction strategy is successfully extended to more cases, e.g., Pd/ST-Al2O3 with higher Pd dispersion and electron density. This work provides a promising strategy for the control of the oxide support for advanced design and synthesis of alkane oxidation catalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2017
·
IF 3.133
Sijia Chen,Qidi Chen,Daoping Cai,Hongbing Zhan
Defect-mediated engineering has been proven as a novel and effective strategy to integrate two individual materials into a nanocomposite to boost the performance. In the present work, nanocomposite of partially-unzipped stacked-cup carbon nanofibers (PUSCNFs) decorated with platinum nanoparticles (Pt NPs) have been successfully synthesized through the defect-mediated formation method. Owing to the introduction of abundant structural defects during the chemical oxidation process , Pt NPs with an average diameter of 2–3 nm were uniformly anchored on the PUSCNFs without any surfactant involved. As comparison, the Pt NPs grown on the stacked-cup carbon nanofibers (SCNFs) possessed markedly larger nanoparticle size and trended to aggregate. The electrochemical properties of the nanocomposite-modified electrodes for biosensing were examined. Our results showed the Pt-PUSCNFs nanocomposite possessed optimal electrocatalytic activities and biosensing performance for detection of biomolecules, which could be attributed to a synergistic effect between the PUSCNFs and Pt NPs on electron transport and catalytic properties. We anticipate that the PUSCNFs may be a potential support material for construction of nanocomposites with good performance.
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MICROCHIMICA ACTA
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2017
·Vol. 184
·期 7
·2031-2038
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IF 4.58
Shao Fengying,Jiao Lei,Wei Qin,Li He
The interference by dissolved oxygen is an obstacle in electrochemical immunoassays. The authors are reporting here on a method that employs a working potential that is below the reduction potential for oxygen and hence is not interfered by oxygen/air. Ternary Pt-Co-Cu nanodendrites were prepared by a one-pot reaction. They were placed on a glassy carbon electrode (GCE) modified with gold nanoparticles (AuNPs) where they showed excellent catalytic activity toward the reduction of hydrogen peroxide at a reduction potential of −0.015 V (vs. SCE). Dissolved oxygen, in contrast, is not reduced at this potential. In order to obtain a sandwich-type of voltammetric immunosensor, antibody against insulin (Ab 1 ) immobilized on the AuNPs on the GCE. The secondary antibody (Ab 2 ) was labeled with Pt-Co-Cu nanodendrites as signal marker for signal amplification. After adding hydrogen peroxide, its catalytic oxidation by the immunosensor depends on its loading with insulin. Hence, insulin can be quantified due to the positive correlation that exists between current and the concentration of ternary Pt-Co-Cu nanodendrites on the electrode. The sensor has a linear response in the 0.2 pM to 2 nM insulin concentration range, with a 0.08 pM detection limit. The assay is well reproducible, acceptably selective, and the sensor is fairly stable over time.
One-pot synthesis of ternary Pt-Co-Cu nanodendrites for oxygen interference-free electrochemical detection of insulin. GCE (glassy carbon electrode). Pt-Co-Cu NP (Pt-Co-Cu nanoparticles). BSA (bovine serum albumin). Ab 1 (coating antibody). Ab 2 (labeling antibody). The sandwich-type electrochemical immunosensor has been used for detecting insulin with high sensitivity, which is based on Au nanoparticles for biomolecular immobilization and the one-pot synthesis of ternary Pt-Co-Cu nanodendrites as label enhancer.
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RSC Advances
·
2016
·Vol. 6
·期 79
·75384-75389
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IF 3.289
Liang-Liang Wu,Li-Ying Wang,Zheng-Jun Xie,Feng Xue,Chi-Fang Peng
This paper reported that the peroxidase-like activity of DNA–Ag/Pt nanoclusters (NCs) can be inhibited selectively by Hg2+. The interaction between Hg2+ and the DNA–Ag/Pt NCs was discussed through characterization by TEM, DLS and XPS, etc. It was found that the integration of both Hg0 and Hg2+ to the DNA–Ag/Pt NCs resulted in the DNA–Ag/Pt NCs aggregation and the decrease of Pt2+ content on the DNA–Ag/Pt NCs surface, which finally impaired their catalytic activity. Based on the above mechanism, a colorimetric detection for Hg2+ was developed with a detection limit (LOD) of 5.0 nM and a linear range from 10 nM to 200 nM. The method was highly selective toward Hg2+ over other common metal ions, low-cost and simple, which facilitated the application of detecting Hg2+ in tap water.
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Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 32
·12630-12637
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IF 8.262
Jianjun Ding,Xiangyang Li,Lin Chen,Xian Zhang,Song Sun,Jun Bao,Chen Gao,Xingyou Tian
Au–Pt/CaIn2S4 composites were synthesized for the first time using the photoreduction method by which bimetallic Au–Pt alloy nanoparticles were in situ site-selectively photoreduced on the edges of monoclinic CaIn2S4 nanosteps. The Au–Pt alloy nanoparticles as cocatalysts can spatially separate the oxidation and reduction sites and effectively enhance the photocatalytic hydrogen activity of CaIn2S4 under visible light irradiation. When introducing 0.5 wt% Au–Pt alloy nanoparticles, the rate of hydrogen production could reach 107.6 μmol h−1, which was higher than that of CaIn2S4, Au/CaIn2S4 and Pt/CaIn2S4 by a factor of 18.3, 2.37 and 2.4, respectively. The enhanced photocatalytic activity for hydrogen production could be attributed to the low recombination efficiency of the photogenerated charges and surface-plasmon-resonance-induced effect of Au nanoparticles.
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Nanoscale
·
2016
·Vol. 8
·期 25
·12812-12818
·
IF 7.76
Zhuoqing Lin,Wenlong Chen,Ying Jiang,Ting Bian,Hui Zhang,Jianbo Wu,Yong Wang,Deren Yang
PtRu bimetallic particles are well-known commercial catalysts with promising performance for methanol oxidation. However, shape-controlled synthesis of PtRu bimetallic nanocrystals, especially for the platonic structures with {100} (e.g., cubes) or {111} facets (e.g., icosahedra) exposed towards catalysis, has met only limited success due to the different crystal structures of Pt and Ru. Here we report a facile approach to the synthesis of Ru decorated Pt bimetallic cubes and icosahedra in a mixed solvent. We found that the cubes were formed in the solvent containing N,N-dimethylmethanamide (DMF) and oleylamine (OAm) possibly due to the selective adsorption of CO on Pt{100} arising from the decomposition of DMF catalyzed by a Ru salt precursor. When hexadecane was added into the aforementioned solvent, the synthesis became a two-phase interfacial reaction due to the large difference in solvent polarity, thereby retarding the reaction kinetics and promoting the formation of the icosahedra with the composition similar to the cubes. When evaluated as catalysts towards methanol oxidation, the Ru decorated Pt icosahedra showed much better performance in terms of specific and mass activity relative to the corresponding cubes. Specifically, the Ru decorated Pt bimetallic icosahedra achieved a specific activity of 0.76 mA cm−2 and mass activity of 74.43 mA mgPt−1, which is ∼6.7 and 2.2 times as high as those of the carbon supported Pt7Ru nanoparticles, respectively. This enhancement can be attributed to a combination of twin-induced strain and facet effects.
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Catalysts
·
2016
·Vol. 6
·期 2
·19
·
IF 2.964
Guozhu Liu,Yunxia Zhao,Jinhua Guo
High selectively catalytic conversion of lignin-based phenols (m-cresol,p-cresol, and guaiacol) intopara-/m-xylene was performed over Pt/HZSM-5 through hydrodeoxygenation andin situmethylation with methanol. It is found that thep-/m-xylene selectivity is uniformly higher than 21%, and even increase up to 33.5% form-cresol (with phenols/methanol molar ratio of 1/8). The improvedp-/m-xylene selectivity in presence of methanol is attributed to the combined reaction pathways: methylation ofm-cresol into xylenols followed by HDO intop-/m-xylene, and HDO ofm-cresol into toluene followed by methylation intop-/m-xylene. Comparison of the product distribution over a series of catalysts indicates that both metals and supporters have distinct effect on thep-/m-xylene selectivity.Keywords:m-cresol;hydrodeoxygenation;methanol;p-/m-xylene;methylation
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CATALYSIS COMMUNICATIONS
·
2017
·
IF 3.33
Zhiming Chen,Bo Xu,Xiaomei Wang,Li Zhang,Xiaoqing Yang,Cuncheng Li
Separation and recycling of noble metal nanoparticles after catalytic reaction is critical to promote its application efficiency and cut down the cost. This work presents a facile synthesis strategy for the fabrication of sandwich-like MIL-100(Fe)@Pt@MIL-100(Fe) (denoted as S-Pt) nanoparticles with high stability and improved catalytic activity for hydrogenation of nitrophenol. MIL-100(Fe) acts as both carrier to make the catalyst easily separated and shield to protect the tiny Pt nanoparticles from leaching or aggregation during reaction. Moreover, mass transfer effect of the porous MIL-100(Fe) with its pore structure serving as nano-reactor is also benefit for promoting the catalytic efficiency.
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