RSC Advances
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2015
·Vol. 5
·期 27
·21290-21296
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IF 3.84
Fanpeng Cai,Yubin Tang,Fangyan Chen,Yan Yan,Weidong Shi
The removal of tetracyclines (TC), the extensively used antibiotics, from the environment has become an important issue. Recently, photocatalytic oxidation on the surface of semiconductors has been found to provide a good tool for the degradation of TC; however, most of these reactions are UV-light driven rather than visible-light driven. Here, Cr doping of SrTiO3 results in a large decrease in the band gap energy, making Cr3+ doped SrTiO3 (Cr-STO) an attractive material for use as a visible-light-driven photocatalyst for tetracycline (TC) degradation. The photoactivity is improved when the Cr/Sr weight ratio changes from 0.5% to 2%, and decreases when the Cr/Sr weight ratio changes from 3% to 10%. In this paper, we also explain the relationship between the doping and the photocatalytic activity. The existence of ˙OH radicals and holes was studied by the electron spin resonance (ESR) spin-trap technique and trapping experiments.
研究领域:
环境科学
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材料科学
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光催化技术
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高影响因子
CHEMISTRY OF MATERIALS
·
2017
·
IF 9.466
Aifei Wang,Yanyan Guo,Faheem Muhammad,Zhengtao Deng
Hollow nanocrystals have attracted considerable attention in many areas of materials science because of their unique geometry, large surface area, high loading capacity and low density, and potential applications in catalysis, energy storage, drug delivery, and molecular separation. So far, numerous hollow nanostructured materials, such as noble metals, metallic oxides, hydroxides, and chalcogenides, have been reported. However, there is no report about the hollow metal halide perovskite nanocrystals yet. Herein, for the first time, we report the controlled synthesis of metal halide perovskite hollow nanocrystals, i.e., CsSnBr3 cubic nanocages, through a facile hot-injection colloidal approach. The formation of nanocages was controlled by rationally choosing the precursors and reaction temperature and was achieved through the self-assembly driven process. The as-synthesized CsSnBr3 nanocages exhibit excellent oxygen resistibility under desiccation conditions. Furthermore, treatment of CsSnBr3 nanocages with perfluorooctanoic acid results in an improved stability against moisture, oxygen, and light. This work represents a step toward hollow nanocrystals of metal halide perovskites for optical, electronic, and optoelectronic applications.
研究领域:
材料科学
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纳米技术
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光电子学
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DOI
高影响因子
Scientific Reports
·
2016
·Vol. 6
·期 1
·1-12
·
IF 5.228
Yang Tao,Zhang Liqin,Hou Xinmei,Chen Junhong,Chou Kuo-Chih
Fabrication of eletrochemical sensors based on wide bandgap compound semiconductors has attracted increasing interest in recent years. Here we report for the first time electrochemical nitrite sensors based on cubic silicon carbide (SiC) nanowires (NWs) with smooth surface and boron-doped cubic SiC NWs with fin-like structure. Multiple techniques including scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and electron energy loss spectroscopy (EELS) were used to characterize SiC and boron-doped SiC NWs. As for the electrochemical behavior of both SiC NWs electrode, the cyclic voltammetric results show that both SiC electrodes exhibit wide potential window and excellent electrocatalytic activity toward nitrite oxidation. Differential pulse voltammetry (DPV) determination reveals that there exists a good linear relationship between the oxidation peak current and the concentration in the range of 50–15000 μmoL L −1 (cubic SiC NWs) and 5–8000 μmoL L −1 (B-doped cubic SiC NWs) with the detection limitation of 5 and 0.5 μmoL L −1 respectively. Compared with previously reported results, both as-prepared nitrite sensors exhibit wider linear response range with comparable high sensitivity, high stability and reproducibility.
研究领域:
材料科学
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分析化学
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DOI
PubMed
高影响因子
Science China-Chemistry
·
2021
·Vol. 65
·期 1
·87-95
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IF 9.445
Zhang Juntao,Le Jiabo,Dong Yuanting,Bu Lingzheng,Zhang Ying,Cheng Jun,Li Leigang,Huang Xiaoqing
Ruthenium (Ru) is one of the most promising metals for its versatility in driving a wide range of catalytic reactions. However, owing to the intrinsic preference of hexagonal close-packed ( hcp ) phase for bulk Ru, currently, it is still challenging to construct Ru-based nanomaterials with face-centered-cubic ( fcc ) phase for optimizing their performance towards potential applications. Herein, we report a facile wet-chemical method to directly create unconventional fcc -structured Ru-copper hollow urchin-like nanospheres ( fcc -RuCu HUNSs) as a class of efficient pH-universal hydrogen evolution reaction (HER) electrocatalyst. Interestingly, this synthetic strategy can be expanded to prepare other fcc -Ru-based alloy nanomaterials. Significantly, the novel fcc -RuCu HUNSs exhibit superior HER performance with the overpotential of only 25, 34, 40, and 26 mV to reach the current density of 10 mA cm −2 in 0.5 M H 2 SO 4 , 0.05 M H 2 SO 4 , 0.1 M KOH, and 1 M KOH, respectively, much lower than those of hcp -RuCu HUNSs and commercial Pt/C. Density functional theory (DFT) calculations further indicate that their excellent pH-universal HER performance results from the optimized adsorption free energy of H and work functions. Our work highlights the importance of phase control to design high-efficiency nanocatalysts for relevant catalytic reactions in energy conversion.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 7
·2101944
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IF 6.389
Qianli Xing,Wei Yan,Chuangyu Wei,Zuoxu Xiao,Zhicheng Jin,Xue Liu,Jianwei Ren,Yanli Chen,Xiyou Li
The multidimensional PtZn quasi-cubic nanodendrites (PtZn-ND) with tremendous amounts of defectively coarse branches, having both highly active high-index facets and short-range (100) and (110) terraces resisted to sulfate, are synthesized via facile oil phase route at first time. The growth process is found to start from Pt nano-cuboid seeds, then PtZn nanoclovers which are formed from epitaxial growth, and then the flower-like PtZn crystals and finally the novel PtZn-ND. The formation mechanism of PtZn-ND, in particular the effects of hexadecyltrimethyammonium bromide (CTAB) and oleic acid (OA) on the morphology, crystal shape and exposure lattice facets, have been comparatively and systematically studied. And it turns out that CTAB mainly controls depositing directions, while OA mainly controls the crystal shape/size. The combination effect results in unique PtZn-ND structures. The novel PtZn-ND also displays superior catalytic performance and anti-sulfate poisoning ability. In particular, the mass activity (MA) and specific activity (SA) are 5.72 and 7.55 times higher than those of commercial Pt/C, and still 2.91 and 5.09 times higher after accelerated durability tests in 0.5 m H 2 SO 4 for oxygen reduction reaction.
研究领域:
材料科学
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纳米技术
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电化学
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催化
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2022
·
IF 9.221
Weiyi Bu,Yan Zhang,Qixuan Qin,Yuliang Li,Zhijie Zhou,Changhua Hu,Xiaohong Chuai,Tianshuang Wang,Peng Sun,Geyu Lu
In our work, CdS nanocrystals were simply prepared via coprecipitation method and subsequent annealing process (300, 400, 500 °C). X-ray powder diffraction (XRD) and the transmission electron microscope (TEM) etc. methods were used to analyze structure morphologies of the samples. The unannealed CdS nanocrystal is cubic, its phase evolution depends on annealing temperature. At 300 °C, its cubic phase was remained. Annealing at 400 °C makes small amount of hexagonal phase produced and cubic/hexagonal homojunctions were formed. Thorough phase transition to hexagonal phase was completed at 500 °C. The sensing properties based on the synthesized CdS nanocrystals with different phase structures were measured. The CdS-400 based sensor had the highest sensitivity to n-propanol, which was 41 at the optimum temperature of 225 °C. The response time was less than 1 s and the best selectivity was also obtained. The greatly enhanced gas sensing performance may be attributed to cubic/hexagonal CdS homojunction.
研究领域:
材料科学
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化学
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高影响因子
Materials
·
2022
·Vol. 15
·期 24
·8971
·
IF 3.748
Yaohui Xu,Liangjuan Gao,Zhao Ding
Doping CeO2with Y cations was achieved in this study using three strategies: doping only during the hydrothermal process (H-Y-doped CeO2), doping only during the impregnation process (I-Y-doped CeO2), and doping during both the hydrothermal and impregnation processes (H/I-Y-doped CeO2). During the three synthesis strategies of Y-doped CeO2, these Y ions could be incorporated into the CeO2lattice in the +3 state while holding the cubic fluorite structure, and no impurity phases were detected. Pure CeO2crystal itself contained a certain number of intrinsicVOdefects, and Y-doping was beneficial for the creation of extrinsicVOdefects. The relative concentrations ofVOdefects were quantified by the values ofA592/A464obtained from Raman spectra, which were 1.47, 0.93, and 1.16 for the H-Y-, I-Y-, and H/I-Y-doped CeO2, respectively, and were higher than that of the undoped one (0.67). Moreover, the OSCs of the three Y-doped CeO2were enhanced, and the sequence of OSCs was: H-Y-doped CeO2(0.372 mmol/g) > H/I-Y-doped CeO2(0.353 mmol/g) > I-Y-doped CeO2(0.248 mmol/g) > Undoped CeO2(0.153 mmol/g); this result was in good agreement with the Raman spectroscopy results.Keywords:CeO2;rare-earth;doping;hydrothermal;impregnation;oxygen storage capability
研究领域:
材料科学
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化学
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DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2022
·
IF 7.968
Yifeng Zhang,Shuo Zhang,Haorong Sun,Zhe Wang,Feixue Gao,Jiawei Zhang,Zezheng Liu,Ming Fang,Xiaoli Tan,Xiangke Wang
Photocatalytic U(VI) extraction is considered as the most promising way to solve the current shortage of uranium resources and radioactive contamination. In this work, O-doped hexagonal-cubic CdS phase heterojunction was constructed by a simple thermal treatment and was successfully used for the photoextraction of U(VI) from water bodies. The samples with different heat treatment temperatures have different phase ratios and oxygen doping amounts. The experimental results show that the CdS heat treated at 350 °C (CdS-350) has the best photocatalytic activity, which can extract 80% of uranium within 120 min (m/v CdS-350 = 0.4 mg/g, C U(VI) = 50 ppm). More interestingly, a systematic mechanistic investigation shows that the extraction process is divided into two steps: i.e., photoelectrons and • O 2 − reducing U(VI) to U(IV) first, followed by photoholes and • OH oxidizing U(IV) to insoluble U(VI) (UO 2 (OH) 2 ). The second step of oxidation allows CdS-350 to avoid photocorrosion, resulting in an excellent recycling performance of only 8% decrease in performance after four cycles.
研究领域:
环境科学
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材料科学
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化学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Jiabing Luo,Xingzhao Wang,Shutao Wang,Wenle Li,Yanpeng Li,Tingyong Wang,Fengqi Xu,Yang Liu,Yan Zhou,Jun Zhang
Inducing the surface reconstruction of spinels is critical for improving the electrocatalytic oxygen evolution reaction (OER) activity. Herein, S-doped NiCo 2 O 4 hollow cubic nanocage was synthesized by anion etching Metal-Organic Frameworks (MOFs) template and air annealing strategies. The hollow structure possesses a large specific surface area and pore size, facilitating active site exposure and mass transport. S 2− doping regulates the electronic structure, reducing the oxidation potential of Ni sites during the OER process, thus promoting the surface reconstruction into γ-NiOOH active species. Meanwhile, S 2− doping enhances conductivity, accelerating interfacial charge transfer. As a result, S-NiCo 2 O 4 -6 exhibits superior OER activity (262 mV overpotential @ 10 mA cm −2 ) and stability in 1.0 M KOH solution. Furthermore, 20 % Pt/C‖S-NiCo 2 O 4 -6 only needs 1.832 V to achieve 50 mA (the electrochemical active area is 4 cm 2 ) in a homemade anion exchange membrane (AEM) electrolyzer. This work proposes a novel approach for preparing efficient anion-doped spinel-based OER electrocatalysts.
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高影响因子
Micromachines
·
2023
·Vol. 14
·期 12
·2211
·
IF 3.4
Wenzhen Wang,Chengxiong Gao,Yuxing Chen,Tao Shen,Mingrong Dong,Bo Yao,Yan Zhu
The ternary chalcogenide AgBiS2has attracted widespread attention in the field of photovoltaic and photoelectric devices due to its excellent properties. In this study, AgBiS2powders with an average diameter of 200 nm were prepared via a simple and convenient reflux method from silver acetate, bismuth nitrate pentahydrate, and n-dodecyl mercaptan. The adjustment of the ratios of Ag:Bi:S raw materials and of the reaction temperatures were carried out to investigate the significance of the synthesis conditions toward the composition of the as-synthesized AgBiS2. The results of XRD indicated that the powders synthesized at a ratio of 1.05:1:2.1 and a synthesis temperature of 225 °C have the lowest bismuth content and the highest purity. The synthesized AgBiS2crystallizes in a rock salt type structure with the cubicFm3¯mspace group. Scanning and transmission electron microscopy, thermogravimetric analysis, ultraviolet–visible–near-infrared spectra, and photocatalytic degradation performance were employed to characterize the as-synthesized samples. The results demonstrated that AgBiS2powders display thermal stability; strong absorption in the ultraviolet, visible, and partial infrared regions; and an optical bandgap of 0.98 eV. The obtained AgBiS2powders also have a good degradation effect on the methylene blue solution with a degradation efficiency of 58.61% and a rate constant of 0.0034 min−1, indicating that it is an efficient strategy for sewage degradation to reduce water pollution.Keywords:AgBiS2;reflux method;photocatalytic degradation
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
GLASS PHYSICS AND CHEMISTRY
·
2020
·Vol. 46
·期 2
·181-185
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IF 0.668
Kai Ma
Abstract In this paper, we present a new cubic boron nitride synthesis method via introduction of highly reactive nitrogen and boron atoms generated from chemical reactions as the raw materials of cubic boron nitride, so the system pressure and temperature are reduced significantly compared with the traditional phase transformation method at super high-pressure and high-temperature, and then the production cost of cubic boron nitride can be reduced greatly and the equipment service life can be extended significantly. Experiments have shown that by this method the cBN can be synthesized with high yield at pressures as low as 2.5 GPa and temperatures as low as 450°C. Compared with the conventional phase transformation method, the pressure decreases by about 50% and the temperature decreases by about 64%. Analyses have shown that the crystal structure of the cBN synthesized is perfect and the impurity content is extremely low.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Frontiers in Pharmacology
·
2025
·
IF 4.8
Zhiqi Shi,Fan Jia,Xiaoyu Tang,Qing Li
Background Knee osteoarthritis (KOA) is a prevalent degenerative joint disease with limited effective treatment options. Oleanolic acid (OA) possesses promising anti-inflammatory and cartilage-protective properties, but its clinical application is hindered by poor solubility and rapid metabolism. Purpose This study aimed to develop an oleanolic acid-loaded liquid crystalline nanogel (OANG) for intra-articular delivery and to systematically evaluate its therapeutic effects and potential mechanisms in a rat KOA model. Methods OA-loaded nanoparticles were prepared and incorporated into a thermosensitive Poloxamer gel base to form OANG. A papain-induced KOA rat model was established. Rats were administered OANG (high/low dose) intra-articularly, with celecoxib as a positive control. Evaluations included behavioral tests, micro-computed tomography, histological analyses (hematoxylin and eosin, transmission electron microscopy, immunohistochemistry), enzyme-linked immunosorbent assay of synovial fluid, serum, and hippocampus, Western blot (WB), network pharmacology, and molecular docking. Results OANG exhibited sustained-release properties and improved joint lubrication. Treatment with OANG significantly alleviated KOA-induced pain and depression-like behaviors, reduced cartilage degradation and subchondral bone sclerosis, and downregulated levels of pro-inflammatory cytokines (tumor necrosis factor-α, interleukin-1β, interleukin-6) and cartilage degradation markers (C-terminal cross-linked telopeptide of type II collagen, cartilage oligomeric matrix protein) in synovial fluid. It also enhanced antioxidant capacity (increased superoxide dismutase, glutathione peroxidase; decreased malondialdehyde) and modulated the expression of key cartilage proteins (increased Collagen II; decreased matrix metalloproteinase 13; regulated glycogen synthase kinase-3β/SRY-box transcription factor 9, β-catenin, and Yes-associated protein). Furthermore, OANG ameliorated hippocampal oxidative stress and inflammation (decreased Cleaved caspase-3, Malondialdehyde; increased IL-10). Network pharmacology and docking suggested the involvement of peroxisome proliferator-activated receptor gamma, mitogen-activated protein kinase 3, prostaglandin-endoperoxide synthase 2, and pathways such as estrogen signaling and cyclic adenosine monophosphate signaling.
研究领域:
药剂学
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骨科学
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分子药理学
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纳米医学
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炎症生物学
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氧化应激
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关节退行性疾病
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）