ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Kaisheng Yao,Tianjin Li,Chenchen Zhao,Weiwei Lu,Shuang Zhao,Jianji Wang
Conceiving a simple, green, and mild one-pot route to grow and construct anisotropic bimetallic 3D architectures with multilevel structures and promising functions is highly desirable and technically important in many applications. Herein, a facile ionic liquid-modulated strategy is presented for the preparation of hyperbranched Au3Pd1 bimetallic nanodendrites (NDs) in aqueous solution at room temperature. To implement this protocol, HAuCl4 and Na2PdCl4 are used as precursors and ascorbic acid as a reductant, and a common ionic liquid 1-butyl-3-methylimidazolium chloride ([C4mim]Cl) is utilized to direct the anisotropic growth of 3D Au3Pd1 NDs, which exhibits an eco-friendly feature. It is shown that the alloy Au3Pd1 NDs possess multilevel architectures, that is, primary 3D large flowers (with diameters of about 2.5–4.0 μm), secondary 2D leaves, tertiary symmetric branches, and quaternary symmetric petals. A series of factors influencing morphologies and properties of the products are investigated, and the results indicate that both [C4mim]Cl and Au/Pd atomic ratios are crucial to the formation of 3D Au3Pd1 NDs. Owing to the well-defined morphology and probable electronic effects between Au and Pd, the 3D Au3Pd1 NDs display high catalytic selectivity and good durability toward stepwise hydrogenation of 4-nitrophenylacetylene with a 100% conversion and 99.5% selectivity to 4-nitrostyrene in the first step and then 100% conversion from 4-nitrostyrene and 96.7% selectivity to 4-nitroethylbenzene in the second step. It is believed that the well-defined 3D Au3Pd1 NDs would also exhibit promising applications in other catalysis and eletrocatalysis applications.
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DOI
高影响因子
Journal of Physical Chemistry C
·
2019
·
IF 4.309
Bo Yu,Bo Han,Xinrui Jiang,Chenggang Zhou,Kaisheng Xia,Qiang Gao,Jinping Wu
Catalytic hydrogenation of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) is widely recognized as one of the most effective solutions to deal with the water-related environmental issues, where catalysts with high activity and long cycle life are always pursued. In this paper, oxygen-rich boron nitride (BNO)-supported Au nanoparticles (Au/BNO) were proposed to serve as catalysts for 4-NP hydrogenation. Our results show that the Au nanoparticles are well dispersed on the highly porous BNO substrate with a small particle size of 2.2 nm. Under the optimal reaction conditions, the 4-NP molecules could be completely reduced to 4-AP in 2.5 min over Au/BNO with a relatively high conversion rate constant of 2.25 min–1. Moreover, the as-synthesized Au/BNO is also highly stable with no visible efficiency decay after been reused for several times. The excellent durability of the catalyst could be ascribed to the strong anchoring strength between the Au nanoparticles and BNO substrate, leading to a negligible metal loss or particle agglomeration upon cycling. The role of O heteroatoms in promoting the activity and durability of the Au/BNO catalyst was further confirmed by first-principles calculations. Our simulation results indicate that the high activity of Au/BNO could be attributed to the strong π–π attraction between BNO and 4-NP, which facilitates the fast diffusion of 4-NP molecules to the surface of Au/BNO. The long cycle life of Au/BNO is correlated to the partially destroyed electronic conjugation of the substrate, leading to a relatively strong coordination interaction between BNO and the Au atom to stabilize the metal nanoparticles.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Junlin Zhu,Xuan Zhang,Zhihui Qin,Lexin Zhang,Yuqu Ye,Meiwen Cao,Lili Gao,Tifeng Jiao
The development of functional hydrogel materials for applications in catalysis has attracted great research interest, especially in aqueous phase catalysis. However, preparation of new structural hydrogel catalysts with enhanced catalytic activity still remains a challenge. In this study, a series of Pd nanoparticles (PdNPs) doped chitosan (CS)-based composite hydrogels were successfully prepared by adding graphene oxide (GO), carbon nanotubes (CNTs) and layered double hydrotalcites (LDHs) to CS hydrogel with glutaraldehyde as a cross-linking agent and in situ growing PdNPs. The structure and morphology analysis indicated that chitosan-based composite hydrogels could be used as carriers to load PdNPs and effectively prevent the agglomeration of PdNPs. Subsequently, 4-nitrophenol (4-NP) catalytic reaction was used as a typical model to evaluate catalytic performances of chitosan (CS)-based composite hydrogel catalysts. The obtained chitosan-based composite hydrogel catalysts exhibited better catalytic activity than that of PdNPs doped CS hydrogel catalyst (CS-PdNPs) and reusability for the reduction of 4-nitrophenol in water. The catalytic process conformed to the pseudo-first-order kinetic equation. Moreover, chitosan-based composite hydrogel catalysts containing CNTs had the best catalytic performance since the particle size of PdNPs was the smallest among three kinds of chitosan-based composite hydrogel catalysts. This work provides new ideas for the preparation of stable and efficient precious metal nanoparticle catalysts for applications in aqueous phase catalysis.
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高影响因子
DYES AND PIGMENTS
·
2021
·
IF 4.889
Pengyue Sun,Diya Yang,Jing Li,Yaodong Zhang
In this work, 4-formyl-3-hydroxybenzoic acid (FHBA), which does not contain a large conjugated ring structure, exhibited aggregation-induced emission (AIE) in aqueous solvents. On this basis, FHBA and a metal-organic framework material (i.e., ZIF-8) form into a complex (FHBA@ZIF-8), which presents the AIE characteristics of FHBA. Then, lanthanide metal (i.e., Eu 3+ ) coordinates with guanosine 5′-monophosphate disodium (GMP) salt to synthesize a coordination polymer (LnCP), which combines with FHBA@ZIF-8 do afford a novel double-emitting fluorescence probe (FHBA@ZIF-8@Eu-GMP, FZE) for tetracycline antibiotics (TCAs). TCAs coordinate with Eu 3+ and act as antenna ligand. Thus, an “antenna effect” comes into being and effectively enhances the emission intensity of Eu 3+ at 616 nm. Moreover, the UV–vis spectra of TCAs largely overlap with the excitation spectrum of FHBA, resulting in an inner filter effect (IFE) and quenching of blue-green fluorescence from FHBA molecules at 473 nm. The ratio of fluorescence signal (F 616 /F 473 ) showed a good linear relationship with the concentration of tetracycline hydrochloride (TC) in the range of 0.1–200.0 μM, and the detection limit was 60 nM (S/N = 3). This fluorescence probe can also effectively respond to oxytetracycline hydrochloride (OTC) and chlortetracycline hydrochloride (CTC). The probe was applied to determine TC in milk, and the recoveries ranged from 94.0% to 101.4%, indicating the application potential of this method. This study provides a novel idea for the construction of ratiometric fluorescence sensing platforms and shows the application potential of the AIE effect of FHBA.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Hui Mao,Meihong Liu,Zhenqian Cao,Chunguang Ji,Ying Sun,Daliang Liu,Shuyao Wu,Yu Zhang,Xi-Ming Song
Novel poly(4-vinylphenylboronic acid) (P4VPBA) functionalized polypyrrole/graphene oxide (PPy/GO) nanosheets , which combined the advantages of GO, PPy and PBA groups, were successfully prepared by a simple polymerization of 4-vinylphenylboronic acid (4VPBA) on the surface of pre-treated PPy/GO containing vinyl groups. Because of the synergistic effects of GO with excellent 2D structures and large surface area, PPy with good electronic conductivity and PBA with high recognition capability, P4VPBA/PPy/GO modified glassy carbon electrode presented excellent electrochemical sensing capabilities toward catechol (CC) and hydroquinone (HQ) with good stability, high sensitivity and selectivity, especially giving a large anodic peak potential difference between CC and HQ enough to well distinguish and simultaneously determine the two dihydroxybenzene isomers in their mixture. It is found that PBA groups on the surface of P4VPBA/PPy/GO nanosheets played an essential role for the discrimination and simultaneous electrochemical determination of CC and HQ, which may be due to the selective formation of stable cyclic esters by the covalent interaction between PBA groups and related molecules with a cis -diol in an alkaline aqueous solution. Therefore, P4VPBA/PPy/GO nanosheets can act as a good electrode material for building a steady electrochemical sensor for detecting the two dihydroxybenzene isomers with high sensitivity and selectivity.
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高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Yanfei Zou,Chen Hu,Shoukun Lv,Yimeng Shao,Bing Teng,Fei You,Hui Xu,Degao Zhong
As a key material for phosphor-converted light-emitting diodes (pc-LEDs) applications, broadband near-infrared (NIR) phosphors currently face poor thermal stability issues. In this work, we synthesized a broadband near-infrared phosphor YGa3(BO3)4: Cr3+ (YGBO: Cr3+) with a high thermal stability. The YGBO: Cr3+ sample exhibits a broadband near-infrared emission centered at 770 nm with a full width at half-maximum (fwhm) of 2130 cm–1 under blue light excitation. Benefiting from the borate host crystal’s strong structural rigidity, wide optical band gap, and weak electron–phonon coupling strength, YGBO: Cr3+ demonstrates strong luminescence thermal stability, and the corresponding luminescence intensity can maintain 80% at 150 °C compared to room temperature. Furthermore, we fabricated a pc-LED device using a blue light chip and YGBO: Cr3+ phosphor, and confirmed its application potential as a near-infrared light source in the spectral analysis of fruit freshness.
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DOI
高影响因子
OPTICAL MATERIALS
·
2019
·
IF 2.687
Yanling Wang,Yachao Du,Lingli Meng,Yueshu Li,Zhi Li,Qingwen Tian
Kesterite Cu 2 ZnSn(S,Se) 4 (CZTSSe) has attracted much attention as an ideal absorber material for thin film solar cells. Solution deposition methods provide a crucial approach for lowering the fabricating price of CZTSSe based photovoltaic devices . Here, a low-cost and robust ethanol/thioglycolic acid/1-butylamine ternary solutions method was developed to fabricate the CZTSSe solar cells. Characterization was performed using XRD , Raman, and C–V, which showed that the material fabricated by this method expressed high-phase purity, suitable carrier concentration, and large depletion width, and those features are vital to high efficiency photovoltaic devices . Hence, based on this high quality CZTSSe absorbed layer, photovoltaic device with a power conversion efficiency (PCE) as high as 9.71% was achieved. The PCE can be further enhanced through passivating with alkali metal and optimizing the device fabrication conditions, making this method much promising for lowering the manufacturing cost of kesterite solar cells. Additionally, this approach is full of application prospect for other burgeoning photovoltaic absorber materials which could dramatically reduce the cost of solar electricity.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Yu Zhang,Xuejie Zhang,Haoran Zhang,Zhan-Chao Wu,Yingliang Liu,Li Ma,Xiaojun Wang,Wei-Ren Liu,Bingfu Lei
A series green emission phosphors Sr 3 Lu 2 (BO 3 ) 4 :Ce 3+ ,Tb 3+ (denoted as SLBO:Ce 3+ ,Tb 3+ ) with broad absorption band matching well with UV LED chip were synthesized by the solid–state reaction method. The phase and structure were analyzed with XRD , EDX , FT-IR measurements. The energy transfer between Ce 3+ and Tb 3+ in SLBO was proved by spectra and decay curves detailedly. The emission colors vary from blue to green by adjusting the ratio of Ce 3+ /Tb 3+ doped concentration. With temperature increasing, SLBO:Ce 3+ ,Tb 3+ phosphor shows well thermal stability that emission intensity retains 70% of its initial at 25 °C even temperature rising to 150 °C. The internal and external quantum efficiency of SLBO:3%Ce 3+ ,8%Tb 3+ are 77.5% and 34.8% under 340 nm excitation, respectively. Combining the as-synthesized SLBO:Ce 3+ ,Tb 3+ and red emission phosphor CaAlSiN 3 :Eu 2+ coated on a 365 nm UV chip, a warm white LEDs device with CRI of 83 was achieved. All the results indicate that the SLBO:Ce 3+ ,Tb 3+ phosphor has potential application in UV pumped white LEDs.
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高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 11
·3819-3830
·
IF 4.099
Karim Khan,Ayesha Khan Tareen,Sayed Elshahat,Ashish Yadav,Usman Khan,Minghui Yang,Luigi Bibbò,Zhengbiao Ouyang
One of the greatest challenges in the enhancement of the electrical properties of conductive mayenite [Ca24Al28O64]4+(4e−) (hereinafter C12A7:e−) is the design of a more suitable/simple synthesis strategy that can be employed to obtain the required properties such as excellent stable electrical conductivity, a high electron concentration, outstanding mobility, and an exceptionally large surface area. Therefore, to synthesize C12A7:e− in the metallic state, we proposed a facile, direct synthesis strategy based on an optimized sol–gel combustion method under a nitrogen gas environment using the low-cost precursors Ca(NO3)2·4H2O and Al(NO3)3·9H2O. Using this developed strategy, we successfully synthesized moderately conductive nanoscale C12A7:e− powder, but with unexpected carbon components (reduced graphene oxide (rGO) and/or graphene oxide (GO)). The synthesized C12A7:e− composite at room temperature has an electrical conductivity of about 21 S cm−1, a high electron concentration of approximately 1.5 × 1021 cm−3, and a maximum specific surface area of 265 m2 g−1. Probably, the synthesized rGO was coated on nanocage C12A7:e− particles. In general, the C12A7:e− electride is sensitive to the environment (especially to oxygen and moisture) and protected by an rGO coating on C12A7:e− particles, which also enhances the mobility and keeps the conductivity of C12A7:e− electride stable over a long period. Doped mayenite electride exhibits a conductivity that is strongly dependent on the substitution level. The conductivity of gallium-doped mayenite electride increases with the doping level and has a maximum value of 270 S cm−1, which for the first time has been reported for the stable C12A7:e− electride. In the case of Si-substituted calcium aluminate, the conductivity has a maximum value of 222 S cm−1 at room temperature.
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高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2018
·
IF 5.08
Cheng-bin Gong,Yue-hong Yang,Mei-jun Chen,Lan-tao Liu,Song Liu,Yu-bo Wei,Qian Tang
The trans to cis isomerization of the azobenzene chromophore in most azobenzene-based photoresponsive molecularly imprinted polymers (MIPs) is initiated by UV irradiation. This limits the application of these materials in cases where UV light toxicity is an issue, such as in biological systems, food monitoring, and drug delivery. Herein we report a tetra- ortho -methyl substituted azobenzene, (4-[(4-methacryloyloxy)-2,6-dimethyl phenylazo]-3,5-dimethyl benzenesulfonic acid (MADPADSA). The photoswitching of MADPADSA could be induced by visible-light irradiation (550 nm for trans to cis and 475 nm for cis to trans ) in 4-hydroxyethylpiperazineethanesulfonic acid (HEPES) buffer-ethanol (4:1, v / v ) at pH 7.0, however, the photoisomerization was slow. With the use of MADPADSA as a functional monomer, NaYF 4 :Yb 3+ ,Er 3+ as a substrate, 4-ethylphenol (4-EP) as a template, a novel photoresponsive surface molecularly imprinted polymer NaYF 4 :Yb 3+ ,Er 3+ @MIP was obtained. The NaYF 4 :Yb 3+ ,Er 3+ @MIP displayed rapid visible-light-induced photoswitching. The NaYF 4 :Yb 3+ ,Er 3+ substrate could efficiently increase the trans to cis isomerization rate of the photoresponsive MIP on its surface, which was faster than that of the corresponding azobenzene monomer MADPADSA. Possible reasons for this effect were investigated by fluorescence spectroscopy. NaYF 4 :Yb 3+ ,Er 3+ @MIP displayed good specificity toward 4-EP with a specific binding constant ( K d ) of 3.67 × 10 −6 mol L −1 and an apparent maximum adsorption capacity ( Q max ) of 10.73 μmol g −1 , respectively. NaYF 4 :Yb 3+ ,Er 3+ @MIP was applied to determine the concentration of 4-EP in red wine with good efficiency and a limit of detection lower than the value that could cause an unpleasant off-flavor.
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高影响因子
FITOTERAPIA
·
2025
·
IF 2.6
Zhong He,Hui Long,Hongyue Ma,Wanrong Ran,Yinhong Song,Wenjuan Shang,Junhui Wang,Ye Qin,Zhangshuang Deng
Triple-negative breast cancer (TNBC) is the most aggressive and malignant breast cancer. Ferroptosis is an oxidative, iron-dependent form of regulated cell death. Ferroptosis-targeted therapies is a promising approach to improving treatment outcomes of TNBC. Combining death pathway inhibitors with relevant indices for ferroptosis and LipROS, this study uncovered that a natural product of 4, 9-dihydroxy- α -lapachone (DLN) from Catalpa bungei “jinsi” exhibited in vitro and in vivo inhibitory activity against TNBC via ferroptosis. The molecular mechanism is an activation of the FTH1 led to iron overload, and then inhibition of cysteine-glutamate antiporter (system Xc − ) and GPX4, which further sensitized TNBC cells to ferroptosis. This study clarified the pathway of DLN-induced cell death in TNBC treatment and exhibited its potential as therapeutic agent for TNBC.
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产品关联
DOI
PubMed
高影响因子
Cancer Management and Research
·
2024
·
IF 2.5
Yantao Yu,Chenkai Zhang,Qiannan Sun,Shantanu Baral,Jianyue Ding,Fanyu Zhao,Qing Yao,Shuyang Gao,Bin Liu,Daorong Wang
Background Gastric cancer (GC) is a highly phenotypically heterogeneous disease and is caused by a combination of factors. Retinol binding protein 4 (RBP4) is a member of a family of lipid transport proteins that are involved in the transport of substances between cells and play a crucial role in a variety of cancers. However, the expression and role of RBP4 in GC remain unknown.Methods In this study, we explored the expression, prognostic significance, immune microenvironment, drug responsiveness and function of associated signaling pathways of RBP4 in GC using web-based bioinformatics tools. Immunohistochemistry and real-time quantitative PCR were utilized to analyze the tissue and cell expression levels of RBP4. CCK-8, colony formation, EDU incorporation, wound healing and transwell assays were applied to demonstrate the effect of RBP4 on GC cell function. Flow cytometric detection of apoptosis after RBP4 knockdown. Nude mice xenograft model elucidates the role of RBP4 for GC in vivo. Related proteins of the RAS signaling pathway were analyzed by employing Western blot assays.Results RBP4 is highly expressed in GC. RBP4 is closely associated with patient survival and sensitivity to a wide range of antitumor agents. Knockdown of RBP4 promoted apoptosis and inhibited cell proliferation, invasion and migration. RBP4 promotes GC tumorigenesis in vivo. Finally, RBP4 modulates the RAS/RAF/ERK axis.Conclusion RBP4 may promote gastric carcinogenesis and development through the RAS/RAF/ERK axis and is expected to be a novel target for GC treatment.
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DOI
PubMed
高影响因子
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