MENDELEEV COMMUNICATIONS
·
2019
·
IF 2.01
Yuliya E. Tyutereva,Peter S. Sherin,Zizheng Liu,Victor F. Plyusnin,Ivan P. Pozdnyakov
Quantum yields of indirect UVC photodegradation of p -arsanilic acid (a widely used phenylarsonic feed additive) caused by the photolysis of humic substances were measured. The acquired results demonstrate that the efficiency of such decomposition of p -arsanilic acid is comparable with that of its direct UVC photolysis due to the participation of active intermediates generated during the photolysis of humic substances. These results could be important for understanding the fate of p -arsanilic acid during an UVC disinfection of wastewaters containing natural humic substances.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2017
·
IF 4.164
Longshi Rao,Yong Tang,Zongtao Li,Xinrui Ding,Guanwei Liang,Hanguang Lu,Caiman Yan,Kairui Tang,Binhai Yu
Rapidly obtaining strong photoluminescence (PL) of carbon dots with high stability is crucial in all practical applications of carbon dots, such as cell imaging and biological detection. In this study, we proposed a rapid, continuous carbon dots synthesis technique by using a microreactor method. By taking advantage of the microreactor, we were able to rapidly synthesized CDs at a large scale in less than 5 min, and a high quantum yield of 60.1% was achieved. This method is faster and more efficient than most of the previously reported methods. To explore the relationship between the microreactor structure and CDs PL properties, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) were carried out. The results show the surface functional groups and element contents influence the PL emission. Subsequent ion detection experiments indicated that CDs are very suitable for use as nanoprobes for Fe 3 + ion detection, and the lowest detection limit for Fe 3 + is 0.239 μM, which is superior to many other research studies. This rapid and simple synthesis method will not only aid the development of the quantum dots industrialization but also provide a powerful and portable tool for the rapid and continuous online synthesis of quantum dots supporting their application in cell imaging and safety detection.
研究领域:
材料科学
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYST
·
2018
·Vol. 143
·期 23
·5812-5821
·
IF 3.864
Xiaohua Pan,Yan Zhang,Xiaobo Sun,Wei Pan,Jinping Wang
Since different quenching mechanisms can endow carbon dots (CDs) with diverse responsive manners, multi-mode sensing can in principle be achieved by a single carbon-dot-based sensor. In this work, green emissive CDs were prepared by simple hydrothermal pyrolysis of phenolphthalein and ethylenediamine at 180 °C for 5 h, with a quantum yield of 17%. The as-prepared CDs can be selectively quenched by Hg2+ due to their specific binding affinity causing photo-induced electron transfer (PET). Due to the inner filter effect (IFE), the CDs also showed intensive fluorescent response to lemon yellow dye. Moreover, the CDs responded to Fe2+ or H2O2 selectively in the presence of H2O2 or Fe2+ owing to oxidative quenching (OQ) by hydroxyl radicals resulting from the Fenton reaction. Via the diverse responsive manners of PET, IFE and OQ, multi-mode sensing for Hg2+, lemon yellow and Fe2+, H2O2 was thus achieved by a single green emissive carbon-dot-based sensor. Accordingly, the linear ranges for the selective detection of Hg2+, lemon yellow, Fe2+ and H2O2 were found to be 0.0–500.0, 0.0–20.0, 0.0–90.0 and 0.0–50.0 μM, with the limits of detection as low as 5.8, 0.5, 1.2 and 1.1 μM, respectively.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2013
·Vol. 15
·期 48
·10495-10499
·
IF 3.879
Shufang Kou,Tingting Yao,Xiaofeng Xu,Rui Zhu,Qing Zhao,Jian Yang
Successful doping of anisotropic semiconductor nanocrystals with impurities offers an effective pathway to manipulate their physical properties and enhance the application performances. However, such doping into anisotropic nanocrystals is seldom reported because it needs simultaneous controls in the crystal growth for a specific shape and composition engineering for transition-metal doping. Here, ultrathin Cu-doped ZnSe nanorods are synthesized by a growth–doping process. The doped nanorods are characterized by XRD and TEM techniques to reveal their crystal structure. Their optical properties are described in terms of UV-Vis absorption spectra and PL spectra. The tunable emission from 480 to 520 nm evidences the successful doping of Cu into ZnSe nanorods. The effects of the reaction time, the reaction temperature and the surface ligand on the optical properties are discussed in detail. After purification, the doped nanorods with a Cu/Zn ratio of 1% give a quantum yield of 7%. This emission could be retained for weeks in air, which is important for its future applications in many fields.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 28
·23737-23745
·
IF 3.289
Ben Dong,Mei Yang,Shusheng Ge,Yi Cao,Baoyan Li,Yun Lu
Polypyrrole (PPy) nanospheres with an average diameter of 20 nm were successfully synthesized by simply using 3-chloroperbenzoic acid in pure ethanol. As-prepared PPy nanospheres showed a moderate photoluminescence signal with a quantum yield (QY) of 2.2% and excitation-dependent photoluminescence characteristics. To carry out the PPy nanosphere surface functionalization, PEG2000, 4,7,10-trioxa-1,13-tridecanediamine and ethylenediamine severed respectively as surface passivating agents, and accordingly 5.5 nm, 4.5 nm and 3 nm sized nanodots were obtained, which exhibited enhanced fluorescence intensity with maximum QYs of 3.1%, 13% and 40% respectively and tunable band gaps in the range of 0.78–1.53 eV. These results were attributed to the increased electron density in PPy fluorescent nanospheres/dots. These resultant PPy fluorescent nanodots could be appropriately applied as cell-imaging agents, fluorescent inks and pH sensors owing to their outstanding characteristics of low cytotoxicity, good biocompatibility and high luminescence stability.
研究领域:
材料科学
·
生物医学工程
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2022
·Vol. 28
·期 61
·e202201990
·
IF 5.02
Jiaqi Guo,Anrui Feng,Yu-e Shi,Zhenguang Wang
Graphical Highly luminescent and thermally stable hybrid phosphors of sulfur nanodots@BaSO 4 were fabricated through an in situ precipitation method. Sulfur nanodots are incorporated in the matrix of BaSO 4 , and BaSO 4 provides passivation effect for surface ligands or traps, resulting in the promotion of photoluminescence quantum yield from 23 % to 58 %, and the BaSO 4 matrix also leads to promotion of thermal stability. Producing high performance phosphors using abundant and non-toxic precursors yet straightforward methods are promising but still a challenging task. Herein, highly luminescent and thermally stable phosphors were fabricated through an in situ precipitation synthesis strategy. Sulfur nanodots (S-dots) act as the precursors for precipitation reactions and also provide the luminescent centers. Structural and optical characterization investigations suggest that S-dots are incorporated in the matrix of BaSO 4 , and BaSO 4 provides passivation effect for the surface ligands or traps of S-dots. This results in the promotion of photoluminescence quantum yield from 23 % to 58 %, and the BaSO 4 matrix also leads to the obvious promotion of thermal stability. These merits endow the construction of phosphor-based light-emitting diodes by utilizing the S-dots@BaSO 4 hybrid phosphors as a color conversion layer. These research results are significant for developing sulfur-based luminescent materials, and also provide a solid and universal theory to produce high quality phosphors.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED ENERGY
·
2022
·
IF 11.446
Tan Li,Jing Su,Huiyuan Wang,Cong Wang,Wen Xie,Kaige Wang
NiMo-doped catalysts were investigated for the conversion of lignin to drop-in fuel through catalytic hydropyrolysis. The influence of NiMo-doped catalysts with different carriers and Ni/Mo molar ratios on the hydropyrolysis product distribution were studied using both lignin and lignin model compounds. Two coefficients were proposed to qualitatively evaluate the catalytic performance of NiMo-doped catalysts. Low yield of methane (13.04c%) and high yield of condensable hydrocarbons products (25.82c%) with low selectivity of polyaromatics (4.37%) were obtained at 1.0 MPa H 2 and 400 °C catalytic temperature during lignin catalytic hydropyrolysis over Ni 1 Mo/ZrO 2 . The hydrodeoxygenation activity of Ni x Mo/ZrO 2 depends on Ni 0 , Mo 4+ , and Mo 3+ . The synergistic effect of Ni and Mo promotes the removal of the phenolic methoxy group. The increase in hydrogen pressure tends to make hydrogen to be consumed through hydrocracking and hydrogenation reactions. The influence of Ni 1 Mo/ZrO 2 on evolution of lignin hydropyrolysis volatiles was revealed. Ni shows strong activity in the removal of phenolic hydroxyl groups and benzene ring hydrogenation, while Mo tends to remove phenolic methoxy groups.
研究领域:
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Ruoming Tong,Pengshuang Zhang,Yaoqi Yang,Ruiyuan Zhang,Xuhui Sun,Xingmao Ma,Virender K. Sharma
This paper presents a new process to synthesize ferrate(VI) (Fe VI O 4 −2 ) continuously through the oxidation of ferric ion (Fe 3+) by hypochlorite (OCl - ) under alkaline condition. Synthesis was performed under different experimental conditions ([OH - ] = 5.0 – 16.0 M, and T = 20 – 45 °C) to obtain optimum yield of ferrate(VI). Under the most favorable condition (i.e., ([Fe 3+ ] = 0.10 M, [OCl - ]: [Fe 3+ ] = 10.0, [OH - ] = 10.0 M, and T = 40 °C), the yield of ferrate(VI) in the newly designed reactor increased by about 11% in 60 min compared to conventional reactor (or increased in [FeO 4 2- ] from 4.0 × 10 −2 M to 4.5 × 10 −2 M). The rapid mixing under flow condition in the closed coil of the new reactor improved the reaction efficiency and yield. When [Fe 3+ ] was varied in the range from 0.10 to 0.20 M in the reactor under the same condition, the optimum concentration of Fe 3+ was at 0.16 M, which increased the concentration of FeO 4 2- to 6.8 × 10 −2 M. Applying ultrasound power density (5.0–25.0 W/L) in the reaction process further increased the yield by about 12% (or increased [FeO 4 2- ] from 6.8 × 10 −2 M without ultrasound to 7.6 × 10 −2 M at 15.0 W/L). Overall, operating the newly designed reactor under ultrasound could increase the concentration of synthesized ferrate(VI) from 4.0 × 10 −2 M to 7.6 × 10 −2 M. At pH 7.0, the prepared ferrate(VI) completely removed atrazine (ATZ), sulfachloropyridazine (SCP), ibuprofen (IBP), and naproxen (NAP)) in water.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Xiang Long,Jiayang Wang,Yanshun Ma,Shaogui Wu
Green-emitting carbon dots (G-CDs) with high quantum yield were successfully synthesized through a one-step bottom-up approach, utilizing laurel leaves as the carbon precursor, o-phenylenediamine (OPD) as the nitrogen source, and N,N-dimethylacetamide (DMAC) as the solvent. Structural characterizations unveiled the presence of abundant nitrogen-containing functional groups on the surface of G-CDs, significantly influencing their luminescent properties. The excitation and emission wavelengths of G-CDs were determined to be 467 nm and 508 nm, respectively, with a quantum yield of up to 49.9 %. Moreover, the emissions of G-CDs were found to be dependent on the excitation wavelength, suggesting a potential correlation between luminescence and particle size. Notably, the stability assessment demonstrated excellent salt resistance and strong photostability of the G-CDs. A brief discussion on the practical application of G-CDs in anti-counterfeit fluorescent ink highlighted their potential in this filed. This study presents a green synthesis strategy for producing high-performance carbon dots, reducing reliance on chemical reagents , lowering synthesis costs, and mitigating environmental pollution.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2023
·
IF 4.3
Jian Yang,Yuen Muk Fung,Peng Wu,Yuan Li,Xiang Liu,Kui Zhang
Photoluminescence (PL) was the core of carbon nano dots (CDs). However, there were different opinions about origin of the PL. Also, the cause for enhanced PL performance via nitrogen doping was still obscure occasionally. However, the fluorophore certification provided an easier understanding on the PL and the surface group ascertainment facilitated nitrogen doping on CDs via surface modification. Imaginably, if CDs were purified in the first place discussions on the PL would be more convincing. Herein, CDs were obtained by hydrothermal treatment on glucose solution and were purified successively via an extraction of ethyl acetate (represented with gCDs). Nitrogen doping was accomplished successfully via the reaction between amine of m -phenylenediamine and the carboxyl of gCDs (the product was represented with N-gCDs). That realized the notable red-shift of the emission with remarkable enhancement of fluorescence quantum yield. Experiments revealed that aldehyde was the fluorophore and C = C bonds constructed the fluorescent skeleton of gCDs or N-gCDs, which were also supported by ab initio calculations on the fluorescent models for gCDs and N-gCDs. Cellular imaging experiment indicated N-gCDs could penetrate cytomembrance of MCF-7 successfully and stained cytoplasm and nucleus effectively during the cell cultivation, which excelled several nitrogen-doped CDs in this aspect.
研究领域:
材料科学
·
生物医学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Longkai Pan,Minggang Zhang,Hui Mei,Li Yao,Zhipeng Jin,Hongxia Liu,Shixiang Zhou,Ziyi Yao,Gangqiang Zhu,Laifei Cheng,Litong Zhang
Use of 3D photocatalytic reactor has been widely explored for development of efficient photocatalytic systems. In the present study, a bionic palisade cells BiOBr/Sr 2 Nb 2 O 7 /Al 6 Si 2 O 13 photocatalytic reactor with high strength was prepared through combination of 3D printing technology and solvothermal method. The carefully designed and optimized bionic palisade cell structure exhibited a periodic porous structure with high surface area. The controllable periodic structure effectively regulated the internal photon transfer and mass transfer. Photon transfer ensured that light is fully scattered within the structure, which improved light utilization. High mass transfer ensured smooth flow of reactant inside the structure, which increased reactant adsorption on the surface of photocatalysts. The interface electric field of the BiOBr/Sr 2 Nb 2 O 7 p-n heterojunction effectively separated the photogenerated electrons and holes. The BOB/SNO/ASO structure had high photocatalytic CO 2 reduction performance under the simulated sunlight. The CO yield for the reaction was 13.68 μmol/g/h, whereas that of CH 4 yield was 6.37 μmol/g/h. Therefore, the findings of the present study provide a basis for design and preparation of high-performance 3D photocatalytic reactors.
研究领域:
材料科学
·
环境科学
·
化学工程
·
光催化
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 11
·5509-5520
·
IF 3.784
Yiang Du,Bing Wang,Wei Li,Quzhi Song,Changwei Shao,Cheng Han,Yingde Wang
Synthesis of spinnable precursors with high ceramic yield is a crucial issue in BN fibers manufacturing by polymer-derived ceramics (PDCs) route. Spinnability and high ceramic yield are the basis of precursor processability, formability, and mechanical properties. Herein, based on DFT simulation, we designed and synthesized a novel polymer precursor poly[2-propylamino-4,6-bis(methylamino) borazine-co-tri(methylamino) borazine] (PPMAB) via a facile one-pot copolymerization strategy. The random copolymerization model of condensations was obtained through DFT calculation. The molecular chain structure, molecular weight, and molecular weight distribution were optimized by adjusting the synthesis conditions. The precursor PPMAB-1:1 with a high ceramic yield of 62.43% and concentrated molecular weight distribution (PDI < 1.3) was obtained. Rheological performance research revealed the excellent and stable spinnability of PPMAB-1:1 by the tunable viscosity and low flow activation energy (23.61 kJ/mol). As a demonstration of spinnability, continuous BN fiber with a fine diameter (>10 km, 7.60 ± 1.13 μm, and 1.6 GPa) was obtained after melt spinning. The present work effectively improved the ceramic yield and spinnability of polyborazine precursors. Simultaneously, it can be used extensively as a universal method to prepare multifunctional copolymers with precise structure control.
研究领域:
材料科学
·
聚合物化学
·
陶瓷工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）