Nano Research
·
2015
·Vol. 8
·期 10
·3237-3249
·
IF 7.01
Liang Ruowen,Jing Fenfen,Shen Lijuan,Qin Na,Wu Ling
Proper design and preparation of high-performance and stable dual functional photocatalytic materials remains a significant objective of research. In this work, highly dispersed noble-metal nanoparticles (Au, Pd, Pt) were immobilized on MIL-100(Fe) (denoted M@MIL-100(Fe)) using a facile room-temperature photodeposition technique. The resulting M@MIL-100(Fe) (M = Au, Pd, and Pt) nanocomposites exhibited enhanced photoactivities toward photocatalytic degradation of methyl orange (MO) and reduction of heavy-metal Cr(VI) ions under visible-light irradiation (λ ≥ 420 nm) compared with blank-MIL-100(Fe). Combining these results with photoelectrochemical analyses revealed that noble-metal deposition can effectively improve the charge-separation efficiency of MIL-100(Fe) under visible-light irradiation. This phenomenon in turn leads to the enhancement of visible-light-driven photoactivity of M@MIL-100(Fe) toward photocatalytic redox reactions. In particular, the Pt@MIL-100(Fe) with an average Pt particle size of 2 nm exhibited remarkably enhanced photoactivities compared with those of M@MIL-100(Fe) (M = Au and Pd), which can be attributed to the integrative effect of the enhanced light absorption intensity and more efficient separation of the photogenerated charge carrier. In addition, possible photocatalytic reaction mechanisms are also proposed.
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NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 18
·10245-10250
·
IF 3.269
X. X. Wu,H. Zhou
Recently, porous carbon materials have attracted attention due to their versatile properties. In this study, a hierarchical porous N-doped carbon (NHPC) was successfully synthesized as a catalyst support using a facile method. A large amount of Pd nanoparticles were uniformly loaded on the NHPC with an average diameter of about 4.45 nm. The synthesized Pd/NHPC nanocatalyst exhibited excellent stability and reusability toward the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) at room temperature. The uniformity and high reusability of Pd/NHPC was mainly attributed to the abundant doped nitrogen as a coordinated site to largely stable Pd nanoparticles. Herein, the excellent properties of NHPC provided ideas for the fabrication of other NHPC supported noble nanoparticles, which can be applied in various catalytic reductive reactions.
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BIOSENSORS & BIOELECTRONICS
·
2016
·
IF 7.476
Mingdang Li,Ping Wang,Faying Li,Qingyan Chu,Yueyun Li,Yunhui Dong
Herein, a novel and sensitive sandwich-type electrochemical immunosensor was fabricated for quantitative monitoring of prostate specific antigen (PSA). The sulfo group functionalized multi-walled carbon nanotubes (MWCNTs-SO 3 H) were used as substrate material to increase the specific surface area and enhance the conductivity of the glassy carbon electrode. Gold nanoparticles (Au NPs) were introduced to enhance the load capacity of the substrate material for primary antibodies (Ab 1 ) and accelerate the electron transfer on the electrode interface. The mesoporous core-shell Pd@Pt nanoparticle loaded by amino group functionalized graphene (M-Pd@Pt/NH 2 -GS) with high specific surface area, high indexed facets, and good biocompatibility was not only as the carriers of secondary antibodies (Ab 2 ) but also catalyzed the reduction of hydrogen peroxide (H 2 O 2 ), which effectually amplified the current signal in detection of PSA. The as-proposed immunosensor exhibited high sensitivity and stability on the detection of PSA. A linear relationship between current signals and the concentrations of PSA was obtained in the range from 10 fg/mL to 50 ng/mL and the detection limit of PSA was 3.3 fg/mL (signal-to-noise ratio of 3). Furthermore, the as-proposed immunosensor showed excellent performance in detection of human serum samples. The results suggest that the proposed immunosensor will be promising in the diagnostics application for accurately quantitative detection of PSA.
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ANALYTICAL CHEMISTRY
·
2017
·
IF 6.32
Shouting Zhang,Dongxu Zhang,Xuehong Zhang,Denghui Shang,Zhonghua Xue,Duoliang Shan,Xiaoquan Lu
Herein, we developed a general strategy for rapid, highly selective, and ultratrace naked-eye colorimetric detection of Hg2+ in aqueous solutions. Two dimensional rGO/PEI/Pd nanohybrids, where rGO, PEI, and Pd were referred to as reduced graphene oxide, polyethylenimine, and Pd nanoparticles, respectively, were synthesized and used as mimetic peroxidase for selective and ultrasensitive detection of Hg2+ in water and human serum samples. In the presence of mercury ions, the peroxidase mimetic activity of rGO/PEI/Pd nanohybrids was found to be stimulated and enhanced significantly, which promoted the effective oxidation and color change of 3,3′,5,5′-tetramethylbenzidine (TMB) in solution to dark blue that was detected by the naked-eye and the absorption spectroscopic method. The proposed sensing strategy coupled with spectroscopic detection method showed an ultralow detection limit of 0.39 nM for Hg2+ in ddH2O and ∼1 nM in wastewater as well as serum samples, respectively. On the basis of the colorimetric assay, a minimum concentration of ∼10 nM for Hg2+ in wastewater and human serum can be detected with the naked-eye. The naked-eye-based colorimetric assay for sensitive and selective detection of mercury is expected to hold huge potentials in applications such as environmental monitoring, clinical diagnosis, and pharmaceutical analysis.
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Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 47
·18354-18365
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IF 8.262
Lin Han,Pengfei Wang,Hui Liu,Qiangqiang Tan,Jun Yang
Tailoring the internal structure and chemical composition of nanomaterials is an effective way to enhance their performance for a given application. Herein, we report a general wet-chemistry approach to produce copper (Cu)-based binary hollow nanostructures with well defined architectures and investigate their catalytic properties in electrochemical reactions. This strategy relies on the galvanic replacement between Cu seeds and noble metal precursors including ruthenium (Ru), rhodium (Rh), palladium (Pd), osmium (Os), iridium (Ir), and platinum (Pt) in oleylamine at an appropriate temperature, which is essential to balance the reduction kinetics of the noble metal precursors by oleylamine during their galvanic replacement with Cu seed particles. Typically, the bimetallic CuPt hollow nanostructures with polyhedral morphologies exhibit enhanced catalytic properties for the oxygen reduction reaction (ORR), while their spherical counterparts obtained at a relatively low temperature show high activity for the methanol oxidation reaction (MOR). In particular, we will also demonstrate a unique application of the CuRu hollow nanostructures in supercapacitors after converting them into binary metal oxides at elevated temperatures in air.
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IONICS
·
2024
·
IF 2.4
Duan Jinrong,Si Fang,Wang Jiafen,Lu Linlin,Liu Jia,Song Yanyan,Mo Jiahui,Yu Jincui,Gao Jinlong
Fuel cell is considered the best candidate power source because of its high energy conversion rate, large capacity, and zero emission. However, noble metal catalysts as a key core material have some problems, such as high cost and poor durability. Therefore, in this paper, the active self-supporting nanoporous Pd–Ag catalysts are successfully formed by cryogenic treatment and one-step dealloying treatment of Al-Pd–Ag ribbons. The surface of the catalyst ligaments shows a certain degree of preferred orientation for high-index facets (220) and (311). The results show that the activity and stability of the catalysts for methanol electrocatalytic oxidation are significantly improved under the synergistic effect of special configuration and promoter Ag. The electrocatalytic activity of the catalysts is about 9.7 and 15.2 times that of commercial Pt/C and commercial Pd/C catalysts, respectively. After 5000 s, the current density of the 1800 rpm-deep2 sample is 382.88 mA·mg −1 , which is about 14.1 times and 39.9 times that of commercial Pt/C catalyst and commercial Pd/C catalyst.
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IET Nanobiotechnology
·
2018
·Vol. 12
·期 4
·441-445
·
IF 2.059
Xiaojie Song,Xianyang Shi,Mi Yang
Biosynthesised nanocomposites have attracted growing interests attributed to their ‘green’ synthesis nature in recent years. Shewanella oneidensis MR-1, a dissimilatory metal-reducing bacterium, was used to reduce palladium (II) nitrate to palladium (0) nanoparticles (Pd NPs) under anaerobic conditions, resulting in the in situ formation of Pd NPs immobilised on TiO 2 nanotubes (TNTs) (Pd/TNTs nanocomposites). The Pd/TNTs nanocomposites were characterised by transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, energy dispersive X-ray, and electron spin resonance, respectively. The results indicated that Pd NPs are successfully grown on the TNTs without aggregation. Photocatalytic degradation of methylene blue (MB) by Pd/TNTs nanocomposites under simulated sunlight was also investigated. Pd/TNTs nanocomposites had photocatalytic efficiency superior to that of single TiO 2 nanomaterials. The photocatalytic activity of Pd/TNTs nanocomposites can be enhanced by S. oneidensis MR-1. The results showed that after only 10 min, the degradation ratio of MB reached 98.7% by Pd/TNTs nanocomposites when simultaneously assisted with S. oneidensis MR-1.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Wenchi Zhang,Xiangheng Niu,Xin Li,Yanfang He,Hongwei Song,Yinxian Peng,Jianming Pan,Fengxian Qiu,Hongli Zhao,Minbo Lan
In analytical science, it is always of great scientific and practical significances to explore convenient, rapid, and reliable methods/devices to trace the H 2 O 2 level in various matrices. Herein, we fabricated a ready-to-use paper-based chemosensor by using mesoporous carbon-dispersed Pd nanoparticles (Pd NPs/meso-C) as a promising peroxidase mimic for the visual determination of H 2 O 2 . Thanks to the large exposed surface of the meso-C support and the highly dispersed active Pd NPs, the synthesized Pd NPs/meso-C exhibited favorable catalytic performance to trigger the chromogenic reaction of colorless TMB to blue TMBox mediated by H 2 O 2 , providing a K cat of 326.67 s −1 for H 2 O 2 and 0.55 s −1 for TMB, larger than the bare Pd NPs and even comparable to the activity of natural horse radish peroxidase. As demonstrated, this principle could be employed to colorimetrically detect H 2 O 2 in the linear scope of 5–300 μM. By simply immobilizing the Pd NPs/meso-C mimic and the TMB substrate onto a common filter paper, ready-to-use paper-based sensors were further prepared. By combining these test strips with a smartphone and an easy-to-access color-scanning APP together, the integrated platform could be used for the quantitative analysis of H 2 O 2 with advantages of simple operation, fast response, low cost, and good selectivity and repeatability. Furthermore, reliable sensing of the target in milk matrices suggested great promise of the integrated platform in practical applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Fenglei Liu,Zhihao Li,Fang Xia,Baowei Hu
The efficient recovery of palladium from the spent nuclear fuel was of great significance to the sustainable development of nuclear energy. Herein, the uniform spherical COFs were constructed by a facile approach at room temperature, which were further surface functionalized by a thiol-ene “click” reaction to recover Pd(II). Microscopic and spectroscopic studies manifested that the formation mechanism and size of spherical COFs were greatly affected by the amount of catalyst and solvent type. The TAPB-BPTA-DTT and TAPB-BPTA-S-β-CD exhibited high Pd(II) recovery efficiency due to the introduction of sulfhydryl groups, and the maximum adsorption capacities were 489.3 and 234.3 mg/g, respectively. Meanwhile, the water environmental condition played an important role in the separation process, and the classical adsorption models demonstrated that monolayer chemisorption was the dominant removal mechanism. Mechanism analysis showed that the excellent adsorption performance was mainly attributed to the electrostatic interaction, physical absorption and chelation of N, O, and S groups with Pd(II). Thus, it is expected that this work could provide more insight into COFs materials, thereby promoting palladium removal advancements in the spent nuclear fuel.
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Surfaces and Interfaces
·
2024
·
IF 5.7
Dongxuan He,Gang Wang,Binghan Li,Junrong Huang,Shuming Dou,Wei Gan,Hengzhi You,Qunhui Yuan
Tris(hydroxymethyl)aminomethane (Tris) and its derivatives serve as crucial biological buffers. Presently, Tris is predominantly synthesized by reducing tris(hydroxymethyl)nitromethane using conventional reducing agents such as hydrazine hydrate and metal powders. However, hydrazine hydrate poses a significant threat to aquatic life, while the use of reducing metal powders generates substantial solid waste, thereby exerting considerable environmental pressure in terms of green and sustainable chemistry. The utilization of non-homogeneous catalysts for hydrogenation reduction offers a viable solution to mitigate these issues. Yet, the exploration of non-homogeneous catalysts remains incomplete and lacks comprehensive research. In this study, a highly active Pd/C catalyst for the hydrogenation reduction of tris(hydroxymethyl)nitromethane was fabricated, through an ultrarapid high-temperature thermal shock (HTS) synthesis. The ultrafine Pd particles (∼5.5 nm) are uniformly distributed on the carbon substrate, rendering the catalyst high activity and stability. Additionally, we successfully combine this heterogeneous catalyst with continuous flow technology and achieve a continuous and stable production of Tris for more than 8 h, with a satisfying yield of ∼96%. This report may shed light on the efficient fabrication of more ultrafine catalysts for hydrogenation reductions with high noble-metal utilization.
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BIOSENSORS & BIOELECTRONICS
·
2025
·
IF 10.5
Yingjing Fan,Weilun Pan,Qi Xiu,Yue Qiao,Peng Zhang,Tong Liao,Junjie Feng,Chengtao Nie,Shuai Chu,Ningcen Li,Xiuhua Wu,Lei Zheng,Zhen Cai,Bo Li
Tumor immunotherapy has significantly improved cancer treatment, yet immune checkpoint inhibitors only benefit a subset of patients. A critical challenge is non-invasive detection of tumor PD-L1 mRNA, a key biomarker that dynamically reflects PD-L1 expression and correlates with therapeutic outcomes. Current methods are hindered by the instability of circulating mRNA and the need for invasive tissue biopsies. Herein, we introduce the Cationic LIposome capsulated CRISPR-Cas13a Kit (CLICK) for in-situ detection of circulating PD-L1 mRNA in extracellular vesicles (EVs). CLICK achieves direct target identification in 10 μL plasma within 2 hours without EV purification or RNA extraction, demonstrating a detection limit of 10 3 EVs/mL for PD-L1 mRNA. By integrating membrane fusion-mediated CRISPR delivery with nanoflow cytometry, CLICK resolves PD-L1 mRNA (+) EV subpopulations at single-vesicle resolution, revealing heterogeneous distributions. Clinically validated in 53 immunotherapy patients, CLICK accurately stratifies progressive disease (PD) from stable disease (SD) patients (AUC = 0.8236; 95% CI: 0.7054–0.9417; p= 0.0006) based on PD-L1 mRNA (+) EV percentages. This work establishes a rapid, blood-based paradigm for therapy response monitoring, advancing liquid biopsy through precise EV RNA characterization.
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JOURNAL OF NANOBIOTECHNOLOGY
·
2021
·Vol. 19
·期 1
·1-22
·
IF 10.435
Zhou Zaigang,Jiang Ning,Chen Jiashe,Zheng Chunjuan,Guo Yuanyuan,Ye Ruirong,Qi Ruogu,Shen Jianliang
Background Mild-temperature photothermal therapy (mild-PTT) has emerged as a highly promising antitumor strategy by triggering immunogenic cell death (ICD) to elicit both innate and adaptive immune responses for tumor control. However, mild-PTT still leads to the risk of tumor recurrence or metastasis because it could hardly completely eradicate tumors due to its impaired immunological efficacy owing to the enhanced PD-L1 expression in tumor cells after treatment.Results In this study, we described a hydrogen peroxide (H2O2) responsive manganese dioxide mineralized albumin nanocomposite loading with mitochondria function inhibitor phenformin (PM) and near-infrared photothermal dye indocyanine green (ICG) by modified two-step biomineralization method. In combination with ICG induced mild-PTT and PM mediated mitochondria dysfunction, PD-L1 expression was obviously down-regulated and the generated immunological responses was able to effectively attack the remaining tumor cells. Meanwhile, the risk of tumor metastasis was effectively inhibited by reducing the expression of tumor invasion-related signal molecules (TGF-β and vimentin) after combining treatment.Conclusion Such a strategy offers novel insight into the development of nanomedicine for mild-PTT as well as cancer immunotherapy, which can provide protection against tumor relapse post elimination of their initial and metastatic tumors.Graphical Abstract
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