Separations
·
2024
·Vol. 11
·期 11
·305
·
IF 2.5
Jingmin Duan,Yafei Zhao,Zhuhe Zhai,Shengqiang Chen,Bing Zhang
Efficient and low-cost nanocatalysts are extremely desirable for the catalytic reduction of 4-nitrophenol (4-NP). A smaller nanocatalyst particle size and stronger support effect can significantly enhance the catalytic performance. Naturally occurring halloysite nanotubes (HNTs) are promising alternative supports for fine metal nanoparticles, but the smooth surface and single type of functional groups on HNTs are usually unfavorable for the anchoring of metal ions. Herein, we modified HNTs using a mild and controllable molten salt etching method to create a rough surface (rHNTs), followed by loading Pt–Ni alloys to prepare Pt–Ni/rHNTs for the catalytic reduction of 4-NP. The results demonstrate that ultrafine Pt–Ni alloy nanoparticles with a diameter of 1.60 nm are uniformly dispersed on the rough surface of rHNTs. The particle size and catalytic performance can be tuned by adjusting the loading amount of Pt–Ni. The optimized Pt–Ni/rHNT (1 wt %) nanocatalyst reveals the smallest Pt–Ni particle size and the highest catalytic rate of 0.1953 min−1, which exceeds many Pt–Ni-based catalysts in previous reports. This work offers an ingenious idea for the mild surface modification of HNTs and a brilliant perspective for the rational design of inexpensive 4-NP reduction nanocatalysts.
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高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 13
·e202405461
·
IF 2
Shipeng Yuan,Peilong Jiang,Guiyou Zhu,Jianwei Guo
Graphical The ligands L1 – L3 were obtained by transesterification of three alkynyl alcohols with triisopropyl phosphite and complexed with Karstedt's catalyst to investigate the effect of catalysts on the curing of one-component silicone rubber. The test results showed that the catalyst synthesized by ligand L2 was the most effective. When added to one-component silicone rubber, the silicone rubber cured at 120 C for 6 min and at 150 C for 142 s. It could be stored at room temperature for more than 30 days and at 50 °C for 24 h. The thermal stability and mechanical properties of the silicone rubber are not affected by the catalyst and are enhanced. The development of wide-range temperature-stabilized catalysts for one-component silicone rubber is challenging because the high room temperature activity of Karstedt's catalyst greatly diminishes the storage stability period of one-component silicone rubber. In this work, three catalyst ligands were constructed based on a transesterification reaction between alkynyl alcohols and phosphite, then were complexed with Karstedt's catalyst. The results of research and testing showed that the platinum-alkynyl phosphite catalysts have better room temperature stability, in which the catalyst synthesized with the ligand tris(trimethyldodecynyl) phosphite ( L2 ) enabled the silicone rubber to be stored at room temperature for more than 30 days and cured rapidly at 120 °C. Adding this catalyst not only preserved the original performance properties of silicone rubber but also enhanced its thermal stability and mechanical properties. The ligand acted as a substituent to complex with Karstedt's catalyst to inhibit its activity, thus solving the problem of poor storage stability of one-component silicone rubber at room temperature.
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高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2025
·
IF 2.4
Shiyuan Wang,Fang Wang,Yalong Song,Zelin Ma,Jiulong Wang,Yazhou Shuang,Weihao Zhao,Jie Jian,Pengfei Guo,Hongqiang Wang
BACKGROUND Carbon dioxide-assisted propane dehydrogenation (CO 2 -ODP) is a promising advanced technology for propylene production. However, a significant challenge still remains in advancing the adsorption and activation of propane and CO 2 , as hydrogenolysis and oligomerization isomerization reactions severely constrain propylene production. RESULTS In this work, we introduce Ga as a second metal promoter into Pt/SiO 2 catalysts, effectively promoting the dispersion of active particles and significantly reducing their size, thereby enhancing their catalytic activity. Meanwhile, the impregnation of Ga also promotes the activation of CO 2 , ultimately accelerating the reverse gas–water shift reaction. CONCLUSION The propylene yield and CO 2 conversion of Pt–Ga 1 /SiO 2 catalyst increased up to 40.45% and 45.10%, respectively, which were 17.54 and 6.62 times higher than those of the pristine SiO 2 –Pt catalyst at weight hourly space velocity (WHSV) = 3.1 h −1 . Most notably, the C 3 H 6 selectivity of SiO 2 –Pt/Ga 1 catalyst remarkably achieved an impressive value of 99.04%, which was much higher than that of other bimetallic-based catalysts, thus providing valuable guidance for the rational development of bimetallic highly active CO 2 -ODP catalysts. © 2025 Society of Chemical Industry (SCI).
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Analytical Methods
·
2018
·Vol. 10
·期 15
·1703-1708
·
IF 2.073
Jiao Ma,Chengcheng Yang,Shu Zhu,Jinyi Song,Yingzi Fu
In this paper, a simple stereoselective sensing platform for the recognition of ascorbic acid (AA) and isoascorbic acid (IAA) was fabricated via immobilizing HS-β-cyclodextrin (HS-β-CD) on the surface of nanocomposite modified glassy carbon electrodes (GCEs). The nanocomposites were prepared using Pt and Pd bimetal nanowires (Pt–PdNWs) and reduced graphene oxide (rGO). The preparation process was characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), cyclic voltammetry (CV) and differential pulse voltammetry (DPV). After the modified electrodes interacted with the analytes, obvious differences in the peak currents of AA and IAA were obtained, hinting at the ability of the proposed sensor to recognize AA and IAA. This sensor with simple preparation, a rapid response, and excellent stability and reproducibility provided a promising perspective to recognize and determine AA and IAA.
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高影响因子
BIOSENSORS & BIOELECTRONICS
·
2013
·
IF 5.437
Zhengxin Li,Meichuan Liu,Lifang Fan,Hongyang Ke,Caifang Luo,Guohua Zhao
In this work, bi-functional SiO 2 -Pt@meso-SiO 2 core–shell nanoparticles were designed to prepare a highly sensitive and selective electrochemical zinc(II) aptasesnor. This core–shell structure boasts its SiO 2 mesoporous shell and the inside Pt nanoparticles. SiO 2 mesoporous shell can fix aptamer without affecting its configuration and can admit electrolyte through the shell. SiO 2 core inside can be the substrate of larger amount of Pt nanoparticles that improve the conductivity of the modified electrode dramatically. Due to the application of such a special bi-functional structure and the aptamer's strong combination capacity with Zn 2+ , Zn 2+ is pre-enriched onto the electrode effectively and specifically, so that it can be determined sensitively and selectively. Results have shown that the zinc(II) aptasensor can be utilized at a wide linear working range from 100 pM to 50 μM and a low detection limit of 65 pM, which makes it practical in both biological samples and environment monitoring. This method has been successfully applied in Zn 2+ monitoring in human blood and disrupted human cells (MCF-7).
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Qing Qu,Guo-Liang Pan,Yan-Ting Lin,Chang-Wei Xu
High efficient and low-cost electrocatalysts for the oxygen evolution reaction (OER) are essential components of renewable energy technologies . However, the high onset potential and limited active sites restrict the catalytic activity of current electrocatalysts. Therefore, we are motivated by the development of cheap and efficient catalytic electrodes to promote the sluggish water-splitting systems associated with the large-scale application of clean and renewable energy technologies. Herein, a novel, simple, and efficient routine is presented by noble metal particles embedded within mesoporous metal oxide materials as high-efficiency anode catalysts for OER. Highly ordered mesoporous Co 3 O 4 was prepared by a nanocasting method using the silica KIT-6 as hard template, showing an enhanced electrochemical performance. Then, M - Co 3 O 4 (M = Pt, Pd, Au) nanomaterials were prepared by a simple but novel chemical reduction method. They show the high surface area of 112.3, 81.0 and 73.6 m 2 g −1 , which can provide more active surface area exposure leads to shorter paths of charges from electrolyte to electrode surface . Moreover, a three-dimensional highly ordered mesoporous structure can facilitate diffusion and penetration of electrolyte and oxygen, and can also keep catalyst nanoparticles in a well-dispersed condition with more active sites. Electrochemical measurements revealed that 20, 50, 25 wt% are the best weight contents for M (M = Pt, Pd, Au) in the Co 3 O 4 with highest electrochemical activity (0.410, 0.415 and 0.422 V vs. SCE) and j 0.7V reaching a maximum value. M-Co 3 O 4 (M = Pt, Pd, Au) materials exhibit superior activities and excellent long-duration stability in alkaline attributed to accelerating the formation of Co(IV) cations after being introduced M(M = Pt, Pd, Au) nanoparticles within mesoporous Co 3 O 4 . This kind of noble metal embedded within mesoporous oxide catalysts will hold a large potential as a highly promising electrocatalyst in the future.
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高影响因子
BIOMATERIALS
·
2020
·
IF 10.317
Yanhua Zhang,Yang Dong,Hao Fu,Hui Huang,Zhihua Wu,Meng Zhao,Xupeng Yang,Qianqian Guo,Yourong Duan,Ying Sun
Cisplatin (Pt(II)) resistance is an important factor in the high mortality rates of ovarian cancer. Herein, we synthesized multifunctional tumor-targeted poly(lactic-co-glycolic acid) (PLGA) nanoparticles (NPs-cRGD) for monitoring therapeutic effects by dual-mode imaging and overcoming cisplatin resistance. Uniformly sized NPs-cRGD demonstrated controlled and sustained release of drugs and genes, excellent gene loading and gene protection capacity, good storage stability and no serum-induced aggregation in vitro . NPs-cRGD demonstrated clear, targeting and prolonged ultrasound imaging and magnetic resonance imaging (MRI) in vivo . The targeting of NPs-cRGD combined with ultrasound facilitated nanoparticle penetrattion into cells; entry was time-dependent. NPs-cRGD escaped from lysosomes , thereby preventing siBIRC5 degradation, which enabled siBIRC5 to efficiently inhibit the antiapoptosis effects of BIRC5 in SKO3-DDP to overcome the antiapoptosis properties of resistant cells. Furthermore, Pt(IV) in NPs-cRGD exhausted glutathione (GSH), thereby increasing drug accumulation to effectively increase Pt(II) levels. The subsequent combination of Pt(II) with DNA prevented the expressions of genes and upregulated the expression of p53 to induce the mitochondria apoptosis pathway. The reduced GSH activity and the generation of Pt(II) further promoted high levels of reactive oxygen species (ROS) to induce cell apoptosis. Therefore, NPs-cRGD with ultrasound promoted the apoptosis of resistant ovarian cancer cells by multiple mechanisms, including increased cellular drug accumulation, reversed antiapoptotic effects by siBIRC5, and enhanced ROS levels. In a tumor-bearing nude mice model, NPs-cRGD with US demonstrated excellent tumor-targeting, high efficiency tumor inhibition and low systemic toxicity. Therefore, NPs-cRGD provides a means to monitor treatment processes and can be combined with ultrasound treatment to overcome ovarian cancer resistance in vitro and in vivo .
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PubMed
高影响因子
Journal of Biomedical Nanotechnology
·
2021
·Vol. 17
·期 5
·921-931
·
IF 4.099
Ming Yang,Yu Yan,Yang Cheng-Li,Chen Xin-Mian,Han Ru-Xia,Hao Ying,Hu Dan-Rong,Pan Meng,Zhou Xiao-Han,Qian Zhi-Yong
Phenylketonuria (PKU) is a common disease associated with amino acid metabolism, and usually occurs in newborns. It can cause serious neurological diseases and even death. However, owing to inadequate-effective treatment, it can only be slowed by a low-phenylalanine (Phe) diet. In addition,
PKU screening is essential for newborns in many countries. Therefore, rapid screening is crucial for preventing damage and meeting the large sample diagnosis demand. For confirmed patients, a convenient method to monitor their regular Phe levels is required. However, current clinical methods
do not meet the rapid screening and convenient monitoring requirements. Herein, a rapid and facile electrochemical device based on platinum-doped reduced graphene oxide nanocomposites was developed to detect PKU biomarker-Phe. The results demonstrated that the developed electrode has great
sensitivity, selectivity, and stability. The detection range was 0.0001 mM to 6 mM with a limit of detection of 0.01 μM. Therefore, this work offers a simple and rapid method for point-of-care PKU screening and daily monitoring.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Shiqi Peng,Rong Li,Yu Huang,Yufei Zhang,Jun-ji Cao,Shuncheng Lee
Producing the strong metal-support interaction (SMSI) interface and highly reactive oxygen species is a great challenge for catalytic oxidation of formaldehyde (HCHO) at room temperature over supported metal catalysts. Herein, we report a conceptual oxygen vacancy ( V O ) associated SMSI interface of Pt-ZrO 2 nanoparticles for HCHO catalysis at room temperature, exhibiting interfacial dependent reactive oxygen species (O*) formation. The V O on the ZrO 2 support captures and activates the molecular O 2 , then proceeds to generating the reactive oxygen atom (O*) with a lower activation barrier of 0.3 eV. The generated O* tends to link the (1 1 0) surface of ZrO 2 and the (1 1 1) surface of Pt as an electronic transmission channel for the selective catalytic oxidation of HCHO adsorbed on the (1 1 0) surface of ZrO 2 , accelerating the direct generation of formate species and mineralization of HCHO. The Pt- V O -ZrO 2 achieves high HCHO removal and HCHO conversion (>95%) at 20 °C. These findings will consolidate the fundamental theories of room temperature catalytic reactions via constructing the SMSI interface engineering for wide environmental applications.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Xianyou Luo,Shengwei Li,Baodong Du,Wende Lai,Haoming Xiao,Junhui Luo,Junyi Li,Yong Chen,Feng Yu,De Li
Carbon materials are significant supports for catalysts, in which surface properties play a crucial role in catalytic performances. However, the correlation between the intrinsic defects of carbon supports and the alkaline hydrogen evolution reaction (HER) performance of catalysts is still unclear. Herein, graphite (G) was used as a model support to study the effect of intrinsic defects of carbon support on the HER performance. To this end, defect-enriched graphite supports were obtained by a simple high-energy ball-milling process. The affluent intrinsic defects (edge surfaces) in graphite supports served as active sites for the dispersion and anchoring of Pt nanoparticles for better electron transfer from Pt species to the support, leading to strong metal-support interactions. The resulting Pt-loaded on defect-enriched DG-30 (Pt/DG-30) delivered a lower overpotential of 46 mV at 10 mA cm −2 when compared to undecorated Pt/G (177 mV), indicating an excellent HER activity. Pt/DG-30 also showed superior stability due to the strong metal-support interactions between Pt nanoparticles and carbon support. In sum, significant insights into the rational optimization and regulation of intrinsic defects of carbon supports were provided for the preparation of new catalysts-modified carbon supports with enhanced HER performances.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Zidan Zou,Zhuoya Chai,Jia Zhang,Chun Chen,Yunxia Zhang,Haimin Zhang,Huijun Zhao,Guozhong Wang
Developing efficient catalysts for selective C═O hydrogenation remains challenging due to the thermodynamic preference for C═C bond activation in α,β-unsaturated aldehydes. To address this limitation, we engineered Pt1Co10 nanoalloys within ethylenediamine-functionalized mesoporous silica (MS) by marrying vacuum-assisted impregnation with spatially constrained self-assembly. This dual spatial–temporal control strategy can achieve precise charge redistribution at metal interfaces, geometric confinement suppressing Ostwald ripening, and optimal hydrogenation pathways via hierarchical porosity. Under industry-feasible conditions (25 °C, 0.5 MPa H2), the Pt1Co10/MS system delivers 96.8% cinnamaldehyde conversion with 72.1% cinnamyl alcohol yield, outperforming conventional Pt or Co catalysts. More importantly, the MS framework’s strain accommodation capability enables activity retention over the cycle test, and the electronic synergy between Pt and Co can optimize adsorption energetics to suppress competitive C═C hydrogenation pathways. This work establishes an approach of bimetal synergy for steering adsorbed intermediate configurations, offering universal strategies for selective hydrogenation catalysis.
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高影响因子
Journal of Energy Chemistry
·
2021
·
IF 9.676
Yihan Feng,Zichuang Li,Shanlin Li,Minghui Yang,Ruguang Ma,Jiacheng Wang
Integrating active Pt clusters into transition-metal oxides with water-dissociation ability is effective to prepare a bifunctional electrocatalyst for water splitting in alkaline. However, the additional utilization of a reductant and/or the operation at the elevating temperature causes the over-growth and agglomeration of Pt clusters, thus losing the high catalytic performance. Herein, we report that V dopant not only favors self-reducing Pt clusters on NiFe layered double hydroxide (LDH) (Pt/NiFeV) at room temperature, but also regulates interfacial charge redistribution to enhance the water-splitting performance. Experimental and theoretical studies reveal that V dopant into NiFe LDH triggers more electrons to transfer to adjacent Fe atoms, thus leading to a higher reducing ability compared to that without V-doping. When used as water-splitting electrocatalyst, V doping promotes electron loss of Pt clusters in Pt/NiFeV, optimizing the free energy of hydrogen adsorption and proton recombination kinetics at the cathode. Meanwhile, it also moves the d-band center of Ni away from the Fermi level to optimize the adsorption of *OH intermediates and facilitate the desorption of oxygen molecules at the anode. Thereby, Pt/NiFeV exhibits much higher bifunctional performance than V-free Pt/NiFe LDH toward both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). This work can spark inspiration of designing other bifunctional electrocatalysts for energy conversion and storage.
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高影响因子
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