ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Yingxin Ma,Sheng Huang,Mingliang Deng,Leyu Wang
A highly water stable and strong upconversion (UC) luminescence NaYF4@PSI–NH nanosensor for the simultaneous and selective detection of 2,4,6-trinitrotoluene (TNT) and 2,4,6-trinitrophenol (TNP) was successfully developed. Via the 980 nm near-infrared (NIR) irradiation, these nanosensors emit strong white UC luminescence with five typical emission peaks centered at 363, 455, 475, 546, and 654 nm. The UC emission at both 363 and 546 nm was quenched by the addition of TNT; however, the ratio of luminescence intensity at 363 nm to 546 nm (I363/I546) had no change with the increase of TNT concentration. Meanwhile, only violet UC emission at 363 nm was dramatically quenched via the addition of TNP, and the I363/I546 ratio is negatively proportional to the TNP concentration in the range of 0.01–4.5 μg/mL of TNP. On the other hand, the green UC emission intensity at 546 nm is in negative proportion to the concentration of TNT. Moreover, cyclohexane, toluene, and other nitroaromatics (such as 2,4-dinitrotoluene (DNT) and nitrobenzene (NB)) have no influence on the detection. Therefore, we developed a facile method for the simultaneous and selective detection of TNT and TNP in the mixture solution of nitroaromatics independent of complicated instruments and sample pretreatment.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2015
·Vol. 7
·期 5
·1732-1737
·
IF 1.821
Rui Ban,Fenfen Zheng,Jianrong Zhang
We present a simple and effective fluorescence method for the detection of 2,4,6-trinitrotoluene (TNT), which is based on TNT recognition by amine-capped silicon quantum dots (SiQDs). The highly luminescent functionalized SiQDs were obtained by a one-step hydrothermal process, using 3-aminopropyltrimethoxysilane as the precursor. The as-prepared SiQDs were directly used as a recognition probe for the detection of TNT because of the strong interactions between the TNT molecule and the SiQDs with an amine group. The formation of Meisenheimer complexes (TNT–amine complexes) could quench the fluorescence of SiQDs by fluorescence resonance energy transfer. Such fluorescence response could be used to quantify TNT over the range of 5–500 nM with a detection limit down to 1 nM, and has been successfully applied for the assay of TNT in spiked tap water. The probe exhibited excellent selectivity. This method has great potential for applications in TNT detection.
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2015
·
IF 5.636
Fei Yan,Yayun He,Longhua Ding,Bin Su
The rapid and sensitive detection of nitroaromatic compounds is of great significance for human health, the environment, and public security. The present work reports on the extraction and electrochemical analysis of trace nitroaromatic compounds, such as explosives and organophosphate pesticides (OPs), using the indium tin oxide (ITO) electrodes modified with a highly ordered and aligned binary assembly of silica mesochannels and micelles (BASMM). With a pore diameter of ca. 2–3 nm, silica mesochannels (SMs) perpendicularly oriented to the ITO electrode surface can provide hard and robust supports to confine the soft cylindrical micelles formed by the aggregation of cationic surfactants, namely, cetyltrimethylammonium bromide (CTAB). Due to the organized self-assembly of hydrocarbon tails of CTAB surfactants, each micelle has a hydrophobic core, which acts as an excellent adsorbent for rapid extraction and preconcentration of trace nitroaromatic compounds from aqueous solutions via the hydrophobic effect. Furthermore, the cylindrical micelles are directly in contact with the underlying electrode surface, to which extracted compounds can freely diffuse and then be reduced therein, thus allowing their determination by means of voltammetry. Using the BASMM/ITO sensor, electrochemical analysis of trace nitroaromatic explosives, including 2,4,6-trinitrotoluene (TNT), 2,4,6-trinitrophenol, 2,6-dinitrotoluene, 3-nitrophenol, and nitrobenzene, and OPs, such as paraoxon, methyl parathion, and fenitrothion, was achieved with a fast response, wide linear range, high sensitivity, and low detection limit at the ppb level. TNT and paraoxon in real apple, tea, and water samples were also determined. By combining the heterogeneous extraction and determination in one ordered binary nanostructure, the BASMM sensor provides a very simple, rapid, and cost-effective way for analysis of nitroaromatic compounds and can be extended to a wide range of lipophilic yet redox-active analytes.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2016
·
IF 3.976
Weizhao Yin,Jinhua Wu,Weilin Huang,Yongtao Li,Gangbiao Jiang
This study investigated the effects of varying nitrobenzene (NB) loadings via increasing flow rate or influent NB concentration mode on the removal efficiency in zero-valent iron (ZVI) columns sterilized (abiotic) or preloaded with acclimated microorganisms (biotic). It was shown that physical sequestration via adsorption/co-precipitation and reductive transformation of NB to aniline (AN) were the two major mechanisms for the NB removal in both abiotic and biotic ZVI columns. The NB removal efficiency decreased in both columns as the flow rate increased from 0.25 to 1.0 mL min − 1 whereas the AN recovery increased accordingly, with relatively high AN recovery observed at the flow rate of 1.0 mL min − 1 . At the constant flow rate of 0.5 mL min − 1 , increasing influent NB concentration from 80 to 400 μmol L − 1 resulted in decreasing of the overall NB removal efficiency from 79.5 to 48.6% in the abiotic column and from 85.6 to 62.5% in the biotic column. The results also showed that the sequestration capacity and chemical reduction capacity were respectively 72% and 157.6% higher in the biotic column than in the abiotic column at the same tested hydraulic conditions and NB loadings. The optimal flow rates and influent NB concentrations were at 0.5 mL min − 1 and 80 μmol L − 1 for the abiotic column and 2.0 mL min-1 and 240 μmol L − 1 for the biotic column, respectively. This study indicated that microorganisms not only enhanced overall reduction of NB, but also facilitated NB sequestration within the porous media and that the optimal loading conditions for overall removal, sequestration, and reduction of NB may be different. Optimal operation conditions should be found for preferred sequestration or transformation (or both) of the target contaminants to meet different goals of groundwater remediation with the ZVI-PRB systems.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Chunchen Zhang,Zhi-Cheng Yao,Qiuping Ding,James J. Choi,Zeeshan Ahmad,Ming-Wei Chang,Jing-Song Li
Particulate platforms capable of delivering multiple actives as well as providing diagnostic features have gained considerable interest over the last few years. In this study, magnetic polymer yolk–shell particles (YSPs) were engineered using a tri-needle coaxial electrospraying technique enabling dual-mode (ultrasonic and magnetic resonance) imaging capability with specific multidrug compartments via an advanced single-step encapsulation process. YSPs comprised magnetic Fe3O4 nanoparticles (MNPs) embedded in the polymeric shell, an interfacing oil layer, and a polymeric core (i.e., composite shell–oil interface–polymeric core). The frequency of the ultrasound backscatter signal was modulated through YSP loading dosage, and both T1- and T2-weighted magnetic resonance imaging signal intensities were shown to decrease with increasing MNP content (YSP outer shell). Three fluorescent dyes (selected as model probes with varying hydrophobicities) were coencapsulated separately to confirm the YSP structure. Probe release profiles were tuned by varying power or frequency of an external auxiliary magnetic field (AMF, 0.7 mT (LAMF) or 1.4 mT (HAMF)). In addition, an “inversion” phenomenon for the AMF-enhanced drug release process was studied and is reported. A low YSP cytotoxicity (5 mg/mL) and biocompatibility (murine, L929) was confirmed. In summary, magnetic YSPs demonstrate timely potential as multifunctional theranostic agents for dual-imaging modality and magnetically controlled coactive delivery.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2024
·Vol. 36
·期 48
·2412319
·
IF 27.4
Xitang Qian,Yuxiang Lyu,Siyu Zhou,Yican Qiu,Yan Sun,Yuan Yuan,Minhua Shao
Metal sulfides are increasingly favored as cathode materials in all-solid-state batteries (ASSBs) due to their high energy density, stability, affordability, and conductivity. Metal sulfides often exhibit capacities exceeding their theoretical limits, a phenomenon that remains not fully understood. In this study, it reveals that this phenomenon is primarily due to the sulfur decomposition from sulfide-based electrolyte. By employing the high-energy ball milling (HEBM) technique, the deposition of sulfide-based electrolyte onto sulfur is intentionally promoted, resulting in higher charge capacities compared to the discharge capacities and surpass theoretical limits of metal sulfides. Using chromium sulfide (Cr 2 S 3 ) as the active material, the sulfur decomposed from sulfide-based electrolyte transforms into lithium sulfide (Li 2 S) after discharge, resulting in an increased capacity by ≈439.6 mAh g −1 and improved cycling stability. Consequently, it demonstrates a specific capacity surpassing 1200 mAh g −1 with a capacity retention of over 80% after 650 cycles, maintaining cycling stability for more than 1900 cycles and achieving a Coulombic efficiency exceeding 99.9%. This versatile HEBM approach enables the fabrication of ASSBs utilizing various transition metal sulfides, such as molybdenum disulfide (MoS 2 ), niobium disulfide (NbS 2 ), and iron disulfide (FeS 2 ), all exhibiting over theoretical limited capacities and prolonged cycling capabilities.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Shiyong Mou,Siyuan Liu,Weidong Dai,Yanjuan Sun,Fan Dong
Electrochemical oxidative amidation (EOA) strategies offer a sustainable and potentially promising route for amide synthesis. However, the efficiency and activity of catalysts under oxidative conditions are highly dependent on noble metals. Herein, we present our experimental findings and fundamental understanding that fluorine-doped Nb 2 O 5 nanosheet arrays on carbon paper (F-Nb 2 O 5 /CP) serve as an efficient and robust non-noble catalyst for the electrochemical synthesis of formamide from ammonia and methanol under ambient conditions. In 0.5 M KHCO 3 solution, this catalyst achieved a high Faradaic efficiency of 52.0 %, with an N selectivity of 79.1 % at 1.5 V versus Hg/HgO electrode. The catalyst exhibited remarkable stability, maintaining its performance over 120 h. By integrating in-situ spectroscopy studies with density functional theory calculations, we revealed that fluorine doping induces a shift in the d-band center of the Nb site. This shift alters the adsorption behavior of OH - and *NH 2 intermediate on the F-Nb 2 O 5 (100) surface, thereby effectively lowering the C-N coupling energy barrier, and boosting the production of formamide.
✓ 已验证
产品关联
DOI
高影响因子
ACTA MATERIALIA
·
2024
·
IF 8.3
Chaowen Tan,Wansen Ma,Liwen Hu,Qian Li,Xuewei Lv,Jie Dang
As a new type of two-dimensional material, MXenes with increased entropy (ME/HE-MXenes) possess immense potential for exhibiting unforeseen properties, making them a compelling subject for further investigation. However, due to the difficulty in predicting and preparing stable medium-entropy MAX (ME-MAX), as precursors of ME-MXenes, only a few ME-MXenes have been synthesized successfully. Herein, we proposed a thermodynamic competition strategy that enabled the successful synthesis of a stable ME-MAX consisting of four-transition metals: Ti, V, Cr and Nb, which was first predicted by density functional theory calculation. The resulting ME-MAX with a hexagonal crystal structure and pseudo-structure of P 6 3 /mmc, possessed the chemical formula TiVCrNbAlC 3 . Subsequently, the corresponding ME-MXene was prepared by selectively etching the Al layer using HF acid, obtaining the desired composition of Ti 1.1 V 1.1 Cr 0.4 Nb 1.4 C 3 T x . Furthermore, aberration-corrected scanning transmission electron microscopy analysis revealed that the MX slabs within the prepared ME-MXene contained four transition metal layers arranged in an α -configuration, which was consistent with the atomic structure of the ME-MAX. In comparison to single transition metal MXenes, the tailored ME-MXene showcased lattice distortions attributable to the highly diverse composition space, consequently leading to increased active sites and improved electrical conductivity . As a result, the annealed Ti 1.1 V 1.1 Cr 0.4 Nb 1.4 C 3 T x has higher mass capacitances when used as the supercapacitor negative electrode, with weight capacitances of 292.74 F g −1 at 2 mV s −1 and 137.20 F g −1 at 200 mV s −1 . The strategy proposed in this study not only expands the realm of achievable ME-MAX compositions but also opens up new possibilities for derivative medium-entropy MXenes.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 131
·期 1
·1-7
·
IF 2.5
Guo Yiming,Zhang Lei,Zhao Yong,Huang Mei,Xu Min,Zhang Yong
This research employed the powder-in-tube (PIT) method to facilitate the introduction of the non-metallic element iodine (I) into the preparation of Nb 3 Al superconducting wires. After heating in a tube furnace, a rapid heating, quenching, and transformation (RHQT) treatment was conducted. It was observed that as the quantity of iodine introduced increased, the extent of the Nb/Al reaction also rose, indicating that a certain amount of iodine can be introduced to facilitate the Nb/Al reaction, thereby enabling Nb to react more fully with Al in the subsequent process and generating a Nb 3 Al superconducting phase that is closer to the stoichiometric ratio. Wires with iodine contents of 1.0 wt%, 1.5 wt%, and 2.0 wt% exhibited a diffusion layer at the Nb/Al interface after heating in a tube furnace at 1000 °C for 30 min. The primary component of the diffusion layer was Nb 2 Al. No diffusion layer was observed in the pure sample or in the group with 0.5 wt% I. However, a eutectic phase was present at the edge of Nb and Al. The wires with 1.0 wt% and 1.5 wt% I exhibited higher critical temperatures ( T c ) of 18.236 K and 17.421 K, respectively, than the pure sample. Additionally, they demonstrated superior critical current density ( J c ) properties compared to the pure sample.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Minhua Mo,Jiling Xie,Ziwei Chen,Qiyuan Yang,Xiaowen Hu,Xiaohe Zhou,Janak L. Pathak,Lijing Wang,Chang Liu,Liangjiao Chen
Inadequate vascularization is a major challenge in tissue engineering and can lead to the failure of tissue defect repair. Currently, the use of nanomaterials has emerged as a critical strategy for tissue engineering. Nanoparticles can be utilized as additives in composite materials to enhance the development of bone tissue engineering. Niobium (Nb), a transition metal element with notable biocompatibility, has potential in angiogenesis. However, the effect of Nb nanoparticles (a form of niobium in the nanoparticle state) on endothelial cell behavior remains unclear. This study focused on the effect of Nb nanoparticles on the differentiation of tip cells and its in-depth regulatory mechanism. Our results revealed that Nb nanoparticles promoted angiogenesis at an early stage and increased bone regeneration in calvarial bone defects. In addition, Nb nanoparticles activated tip cell differentiation and thereby promoted cell migration and tube formation. Furthermore, we verified that Nb nanoparticles promoted endothelial tip cell formation by activating YAP. Nb nanoparticles regulates YAP through the newly identified upstream regulatory molecules FOXA1 and PAK4. When FOXA1 or PAK4 was inhibited, YAP expression and tip cell activation were inhibited. Thus, Nb nanoparticles promoted angiogenesis by activating endothelial tip cells, and the FOXA1-PAK4-YAP signaling cascade regulated this process. The insights garnered from this study suggest a strategy for tissue engineering and lay a theoretical foundation for the expanded application of Nb nanoparticles in this field.
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2017
·
IF 4.208
Hui Yun,Bin Liang,Deyong Kong,Aijie Wang
Bioelectrochemical systems (BESs) have been tentatively applied for wastewater treatment processes, but the complex composition of wastewater could lead to difficulties in establishing functional biofilm or result in performance instability. Few studies have investigated the enrichment of biocathode with domestic wastewater (DW) and the function. A biocathode with multi-pollutant removal capabilities was enriched based on polarity inverted bioanode, which was established with DW. The biocathode function was examined using model pollutants (nitrate, nitrobenzene and Acid Orange 7) supplemented as sole or mixed electron acceptors. When compared to the anaerobic control treatment, the biofilm demonstrated significantly enhanced reduction abilities in the open circuit. For the closed circuit, their removal efficiencies were further enhanced for both the sole and mixed substrates conditions. The bioanodes community structure and diversity markedly changed after operating for 50 d as biocathodes. The biocathode multifunctionality and stability could be related to the maintenance of organic matters fermentative bacteria (mainly belonging to Bacteroidetes, Firmicutes and Synergistetes) and the enrichment of versatile pollutant-reducing bacteria (e.g. Pseudomonas , Thauera and Comamonas from Proteobacteria). Other pollutants, such as perchlorate , sulfate, heavy metals, and halogenated organics, may also work as potential electron acceptors. This study provides a new strategy to improve the biocathode community multifunctionality for simultaneous bioelectroreduction, which can be combined with other wastewater treatment processes in actual application.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Mengyuan Qi,Bin Liang,Rongrong Chen,Xun Sun,Zhiling Li,Xiaodan Ma,Youkang Zhao,Deyong Kong,Jun Wang,Aijie Wang
The bioelectrotransformation efficiency of various organic matters and corresponding electrode biofilm community formation as well as electron transfer efficiency in bioelectrochemical systems (BESs) with different modified electrodes has been extensively studied on the anode side. However, the effects of cathode interface characteristics towards the BESs bioelectrotransformation performance remain poorly understood. In this study, the nitrobenzene-reducing biocathode catalytic efficiency and community structure in response to different modified electrodes (control: hydrophobic and no charge; –SH: hydrophobic and single negative charge; –NH 2 : hydrophilic and single positive charge –NH–NH 2 : hydrophilic and double positive charges) were investigated. The biocathode transformation efficiency of nitrobenzene (NB) to aniline (AN) (E NB-AN ) was affected by the nature of electrode interface as well as the biocathode community formation and structure. Cathodes with hydrophilic surface and positive charges have performed well in the bioelectrotransformation experiments, and especially made an outstanding performance when inorganic NaHCO 3 was supplied as carbon source and cathode as the sole electron donor. Importantly, the hydrophilic surfaces with positive charges were dominated by the electroactive nitroaromatic reducers ( Enterococcus , Desulfovibrio and Klebsiella ) with the relative abundance as high as 72.20 ± 1.87% and 74.86 ± 8.71% for –NH 2 and –NH–NH 2 groups respectively. This could explain the higher E NB-AN in the hydrophilic groups than that of the hydrophobic –SH modified group. This study provides new insights into the effects of electrode interface characteristics on the BESs biocathode performance and offers some suggestions for the future design for the improvement of bioelectroremediation performance.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）