CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2014
·
IF 0.7
Yue XU,Chun-Jing TANG,Hong HUANG,Chao-Qun SUN,Ya-Kun ZHANG,Qun-Feng YE,Ai-Jun WANG
Fluorescent carbon quantum dots (CQDs) were synthesized by one-step hydrothermal treatment with apple juice as raw material. The result indicated that the fluorescence could be quenched by Hg 2+ with high specificity. Based on this phenomenon, a selective and sensitive sensor was constructed for the detection of Hg 2+ in phosphate solutions (pH 7.0). The fluorescence intensity showed linear responses with Hg 2+ concentration ranging from 5.0 to 100.0 nM and 1.0 to 50.0 μM, with the detection limit of 2.3 nM ( S / N = 3). The as-fabricated sensor was further extended for the determination of Hg 2+ in real water samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2016
·Vol. 27
·期 14
·145701
·
IF 3.573
Yong Zuo,Ji-Ming Song,He-Lin Niu,Chang-Jie Mao,Sheng-Yi Zhang,Yu-Hua Shen
P-nitrophenol (4-NP) and hydrazine hydrate are considered to be highly toxic pollutants in wastewater, and it is of great importance to remove them. Herein, TiO2-loaded Co0.85Se thin films with heterostructure were successfully synthesized by a hydrothermal route. The as-synthesized samples were characterized by x-ray diffraction, x-ray photoelectron spectroscopy, transmission electron microscopy and selective-area electron diffraction. The results demonstrate that TiO2 nanoparticles with a size of about 10 nm are easily loaded on the surface of graphene-like Co0.85Se nanofilms, and the NH3 · H2O plays an important role in the generation and crystallization of TiO2 nanoparticles. Brunauer–Emmett–Teller measurement shows that the obtained nanocomposites have a larger specific surface area (199.3 m2 g−1) than that of Co0.85Se nanofilms (55.17 m2 g−1) and TiO2 nanoparticles (19.49 m2 g−1). The catalytic tests indicate Co0.85Se–TiO2 nanofilms have the highest activity for 4-NP reduction and hydrazine hydrate decomposition within 10 min and 8 min, respectively, compared with the corresponding precursor Co0.85Se nanofilms and TiO2 nanoparticles. The enhanced catalytic performance can be attributed to the larger specific surface area and higher rate of interfacial charge transfer in the heterojunction than that of the single components. In addition, recycling tests show that the as-synthesized sample presents stable conversion efficiency for 4-NP reduction.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2014
·
IF 1.552
Shurong Wang,Qinjie Cai,Xiangyu Wang,Li Zhang,Yurong Wang,Zhongyang Luo
Acids and ketones in biomass pyrolysis oil (bio-oil) can be readily cracked to produce hydrocarbons. They can also be enriched in the distilled fraction using molecular distillation techniques. To simulate the actual composition of the distilled fraction, the co-cracking performance of mixtures of hydroxypropanone, cyclopentanone, and acetic acid with ethanol in a fixed-bed reactor over an HZSM-5 catalyst was studied. The influences of reaction temperature and pressure on the reactant conversion, selectivity, and composition of the oil phase were investigated. At a low reaction temperature of 340 °C, the conversions of acetic acid and ethanol were as low as 67.9% and 74.4%, respectively, and the oil phase had a low hydrocarbon content of 59.8%, with large amounts of oxygenated byproducts. Cracking under atmospheric pressure also generated a low-quality oil phase with a very low selectivity of only 10.8%. Increasing the reaction temperature promoted reactant conversion and improved the deoxygenation efficiency, whereas increasing the reaction pressure significantly promoted hydrocarbon production. The optimum conditions for biogasoline production were 400 °C and 2 MPa. Under these conditions, the reactant conversion reached 100% and the oil phase selectivity was 31.5 wt%. This oil phase consisted entirely of hydrocarbons, 91.5 wt% of which were aromatic hydrocarbons , indicating that the HZSM-5 catalyst had high activity for deoxygenation and aromatization reactions during cracking. In addition, characterization of the spent catalysts and stability tests showed that the catalyst was deactivated after a long reaction time. However, the catalytic activity was recovered by catalyst regeneration.
研究领域:
能源生物学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2014
·Vol. 32
·期 5
·429-433
·
IF 1.342
Xilin ZHU,Shumin HAN,Xin ZHAO,Yuan LI,Baozhong LIU
Hydrogen storage properties of 2LiNH 2 -MgH 2 system were improved by adding lanthanum hydride (LaH 3 ), and the role of LaH 3 in hydrogen sorption process of Li-Mg-N-H system was investigated. Temperature programmed sorption results showed that the addition of lanthanum hydride reduced the dehydriding/hydriding onset temperature of 2LiNH 2 -MgH 2 system by at least 15 K. Moreover, A 0.053 wt.%/min average rate was determined for the hydrogen desorption of 2LiNH 2 -MgH 2 -0.05LaH 3 composite, while it was only 0.035 wt.%/min for 2LiNH 2 -MgH 2 system. Hydrogen absorption capacity increased from 1.62 wt.% to 2.12 wt.% within 200 min by adding LaH 3 into 2LiNH 2 -MgH 2 system at 383 K. In the dehydrogenation of 2LiNH 2 -MgH 2 -0.05LaH 3 composite, LaH 2 transferred to LaN phase, which reversed to LaH 2 in the following hydrogen adsorption process. The reversible reaction of LaH 2 effectively promoted the hydrogen sorption of Li-Mg-N-H system. Moreover, the homogenous distribution of fine La hydride was favorable to improving effect of lanthanum hydride.
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2014
·Vol. 32
·期 8
·686-690
·
IF 1.342
LIU Lisha,CHEN Haohong,LIU Biqiu,ZHANG Hui,TANG Bin,FENG Xianjuan,SUN Zhijia,ZHAO Jingtai
To explore novel nano-scintillator with a controllable architecture, pure and Eu 3+ doped lutetium oxyfluoride (Lu 7 O 6 F 9 ) powder were synthesized by combining mild hydrothermal method and solid state calcination approach. The products were all pure orthorhombic Vernier phase demonstrated by X-ray powder diffraction (XRD). The detailed crystal structure was also studied by Reitveld refinement. Lath-like microcrys tals composed of nanoparticles with unique hollow tube of the products were supported by the images of scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Excited by X-ray with W as the target, the pure product showed intense broad emission with the peak at about 400 nm suitable for modern photoelectric multiplier tube (PMT), while the Eu 3+ doped sample transferred the incident energy to Eu 3+ ions and gave strong 5 D 0 → 7 F j ( j =0, 1, 2 and 4) emission, which fitted for imaging and labeling measurements. From the luminescent properties, both pure and Eu 3+ -doped products are potential excellent scintillator for X-ray imaging and other high energy detectors, and the pure product is also a good host candidate for rare earth doping.
研究领域:
材料科学
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无机化学
·
发光材料
·
纳米医学
·
生物成像
·
辐射探测
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2015
·Vol. 33
·期 9
·927-932
·
IF 1.261
Hailong PENG,Qiangsheng GAO,Lili MENG,Lixia ZHANG,Qi PANG,Lifang LIANG
Ca 12 Al 14 O 32 F 2 :Eu 3+ red phosphors were prepared by the sol-gel method with CF 3 COOH as the fluorine source. X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectra, and photoluminescence spectra, as well as thermogravimetric and differential thermal analysis were utilized to characterize the samples. All the samples were single phase with a cubic structure. The as-obtained Ca 12 Al 14 O 32 F 2 :Eu 3+ red phosphors consisted of nanoparticles with sizes of approximately 40–100 nm. Under the excitation of UV light, Ca 12 Al 14 O 32 F 2 :Eu 3+ exhibited the characteristic emissions of Eu 3+ , and the effect of annealing temperature, annealing time, and CF 3 COOH and Eu 3+ concentrations on the luminescence intensity were discussed in detail.
研究领域:
材料科学
·
无机化学
·
发光材料
·
纳米材料
·
固体化学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2014
·Vol. 42
·期 8
·1131-1135
·
IF 0.7
Hui-Zhi LI,Tao ZHAI,Guang-You ZHANG,Mei-Shan PEI
A novel fluorescence switch was constructed based on poly 3-{[1-(2-hydrazino-2-oxoethyl) piperidin-4-ylidene]methyl} thiophene (PMTH) in the presence of Pb 2+ and S -adenosylmethionine (SAM). The fluorescence of PMTH solution can be efficiently quenched by Pb 2+ ions, resulting in a “fluorescence off” state. Upon the addition of SAM, a strong Pb 2+ chelator, to Pb 2+ -PMTH solution, fluorescence of PMTH can be restored, leading to fluorescence “on”. Based on this fluorescence switch characteristics of PMTH, a new method for recognition and determination of SAM was established. By investigating the fluorescence spectral characteristics of Pb 2+ -PMTH and Pb 2+ -SAM complexes in H 2 O/CH 3 CH 2 OH (4:1, V/V ) solution, we found this method offered advanced sensitivity and selectivity for detecting SAM in the presence of common amino acids and metal ions. Under optimum conditions, the relative fluorescence intensity exhibited a linear relationship with SAM concentration in the range of 1.0 × −8 –2.0 × 10 −6 M. The regression equation was Δ 68.51 + 72.32 C (μith a correlation coefficient r = 0.9982. The limit of detection was 8.72 × 10 −9 M. The method was successfully applied in the detection of SAM in real samples.
研究领域:
分析化学
·
高分子科学
·
荧光传感
·
生物分析化学
·
环境监测
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2014
·
IF 1.552
Ming Ge
A visible-light-driven Ag 3 PO 4 catalyst was successfully synthesized by a facile ion-exchange route. The as-synthesized Ag 3 PO 4 was characterized by X-Ray diffraction (XRD), field-emission scanning electron microscopy, N 2 adsorption-desorption, UV-Vis diffuse reflectance spectroscopy and Fourier transform infrared spectroscopy . Under visible light irradiation , the Ag 3 PO 4 catalyst showed excellent photocatalytic activity for rhodamine (RhB) degradation, but was poor at degrading methyl orange (MO) because of lower adsorption of MO molecules onto the surface of the Ag 3 PO 4 . The photodegradation of RhB and MO was achieved by holes and O 2 •− radical attack in the Ag 3 PO 4 suspension. The photodegradation of MO over the Ag 3 PO 4 catalyst was greatly enhanced in the presence of RhB owing to greater production of O 2 •− radicals.
研究领域:
环境化学
·
光催化
·
材料科学
·
环境功能材料
·
污染物降解
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2014
·
IF 0.7
Man-Man ZHANG,Li-Qiang WANG,Dan XIAO,Zhen-Jing ZHUANG
A room temperature phosphorescent (RTP) silica nanomaterial was prepared using sol-gel method and characterized by TEM, XRD and photoluminescence spectra. The results demonstrate that the obtained sample was silica with a diameter of about 50 nm. The maximum fluorescence excitation and emission wavelengths of the silica nanomaterical were 280 and 335 nm, and the maximum phosphorescence excitation and emission wavelengths of the silica nanomatericals were 280 and 440 nm. The sample possessed the room temperature phosphorescence that was stable against environmental changes. The sample was stored in air at ambient conditions and its phosphorescence remained unchanged after 3 month demonstrated its long-term stability. Furthermore, the obtained RTP silica nanoparticle is noncytotoxic and can serve as bioprobes for cellular imaging.
研究领域:
材料科学
·
生物医学工程
·
细胞生物学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2015
·Vol. 36
·期 2
·204-208
·
IF 1.964
Zhongkui Zhao,Renzhi Li,Yu Li,Guiru Wang
A clean and highly efficient catalytic aerobic reductive ring-cleavage of 3–methylanthra[1,2- c ]isoxazole-6,11-dione to 1-amino-2-acetylanthraquinone was performed using simple organic amines as organocatalysts and water as a green reaction medium. This method provides a new clean transformation of isoxazole-containing compounds to the corresponding ortho -amino ketones . The catalytic performance of various organic amines was carefully screened, and simple organic primary amines were found to be promising practical catalysts with outstanding catalytic performance. Isopropylamine as the organocatalyst gave 97.2% conversion of 3–methylanthra[1,2- c ]isoxazole-6,11-dione, with 97.2% selectivity to 1-amino-2–acetylanthraquinone, in the presence of oxygen only, using 1 equiv. of hydrazine hydrate at room temperature for 3 h. A possible mechanism is also proposed.
研究领域:
有机化学
·
催化化学
·
绿色化学
·
药物化学
·
合成方法学
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2014
·
IF 1.342
Xiang LIU,Jingyan WANG,Qingyuan LI,Sai JIANG,Tianhao ZHANG,Shengfu JI
The rare earth metal-organic frameworks (Ln-MOFs) materials, Ln(BTC)(H 2 O)·(DMF), were synthesized using the rare earth metal (Ln=Sm, Eu, Tb, Y) and 1,3,5-trimesic acid (BTC) as a metal ion center and ligand, respectively. X-ray diffraction (XRD) and infrared spectroscopy (FT-IR) were employed to characterize the Ln-MOFs structural features. The property of adsorption desulfurization of Ln-MOFs materials was evaluated with thiophene/n-octane as model oil. The results showed that Ln-MOFs with rare earth metals Sm, Eu, Tb and Y had perfect crystalline and good adsorption desulfurization ability. Y(BTC)(H 2 O)·(DMF) material had a comparatively better activity for the adsorption desulfurization with desulfurization rate up to 80.7% and the sulfur adsorption capacity was found 30.7 mgS/g(Y-MOFs). The Ln-MOFs materials had excellent reusability.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2014
·
IF 1.552
Xingcui Guo,Xicheng Wang,Jing Guan,Xiufang Chen,Zhangfeng Qin,Xindong Mu,Mo Xian
Ru particles were introduced into the zeolite ZSM-5 (MFI) by either a conventional impregnation method or a one-step template-free process. The resultant materials were characterized by X-ray diffraction, N 2 adsorption-desorption, scanning electron microscopy, transmission electron microscopy, NH 3 and CO 2 temperature-programmed desorption. The results indicated that the Ru species in ZSM-5 catalysts prepared via the latter approach (designated as Ru/ZSM-5-TF) were highly dispersed in the ZSM-5 framework structure and this material exhibited high catalytic performance during the hydrogenation of D-glucose to D-sorbitol. The conversion of D-glucose was as high as 99.6% with D-sorbitol selectivity reaching 99.2%, exceeding the performance of Ru/ZSM-5 catalysts prepared by the conventional impregnation method with microporous or desilicated ZSM-5 supports. More importantly, this catalyst showed high stability against leaching and poisoning and could be reused several times. The extensive dispersion of the Ru species, strong interaction between the Ru species and the ZSM-5, and the suitable surface acidity-basicity balance of the Ru/ZSM-5-TF were all critical factors leading to excellent catalytic behavior and stability.
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）