SYNTHETIC METALS
·
2016
·
IF 2.299
Libo Sun,Xun Sun,Yuhua Zheng,Qingquan Lin,Huijuan Su,Caixia Qi
Herein, polystyrene/polyaniline/Au (PS/PANI/Au) composites were prepared by a novel method using self-made Au(en) 2 Cl 3 as the Au source and were used as the catalysts for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). Before the preparation of PS/PANI/Au, PS microparticles were sulfonated by the copolymerization between styrene and sodium 4-styrenesulfonate (SSS). Then self-made Au(en) 2 Cl 3 was added and Au(en) 2 3+ species were adsorbed on the surface of sulfonated PS particles due to the electrostatic attraction. The Au(en) 2 3+ was then reduced to Au nanoparticles in situ by aniline monomer. After the polymerization of the residual aniline monomer by ammonium persulfate (APS), the PS/PANI/Au composite catalysts were obtained. The morphology and structure of the as-prepared PS/PANI/Au composites were characterized by TEM, FT-IR, XPS and EDX. Their catalytic performance for the reduction of 4-NP by NaBH 4 was evaluated by means of UV–vis spectroscopy. The as-prepared PS/PANI/Au composites are very active for the reduction of 4-NP by virtue of the interaction between Au nanoparticles and PANI shell. The catalytic reaction obeys the pseudo-first-order reaction equations and the reaction rate constants are also calculated in this paper.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2016
·
IF 2.76
Yu Zheng,Ping Zhang,Hairong Yue,Gang Xiang,Zexin Qian,Hongtai Li,Wei Jiang,Bin Liang,Simo O. Pehkonen,Shaojun Yuan
Ni 3 Si 2 O 5 (OH) 4 nanotubes (NTs) are synthesized by a facile one-pot hydrothermal reaction, and further functionalized by grafting of poly(methacrylic acid) (PMAA) brushes via distillation-precipitation polymerization. The resultant PMAA-grafted NTs are used as a novel nanosorbent to uptake copper(II) ions. Success in each functionalization step is ascertained by the characterization of TEM, FTIR, XPS, SEM and TGA. Batch adsorption results indicate that the adsorption of the pristine and PMAA-grafted silicate NTs is fairly fast and the equilibrium is established within 20 min, and the kinetics follow the pseudo-second-order mechanism, evidencing chemisorption as the rate-limiting step. The best interpretation for the equilibrium data is given by Langmuir isotherm, and the maximum adsorption capacity is 2.13 mmol g −1 (136 mg g −1 ) at pH 5 and 25 °C. The successive adsorption-desorption studies reveal that the PMAA-grafted silicate NTs are readily regenerated, and keep their adsorption and desorption efficiencies constant over five cycles. The Ni 3 Si 2 O 5 (OH) 4 - g -PMAA NTs could be directly reduced via hydrothermal reaction to achieve magnetic property for easy separation. With the inherent advantages of pH-sensitivity of PMAA, large surface area and magnetic properties of Ni 3 Si 2 O 5 (OH) 4 NTs, the PMAA-grafted silicate NTs offer a promising and highly efficient nanocomposite sorbent to remove heavy metal ions from aqueous solution.
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RSC Advances
·
2016
·Vol. 6
·期 27
·22827-22838
·
IF 3.289
Li Guan,Yanfeng Hao,Lei Chen,Meng-Lin Wei,Qin Jiang,Wen-Yuan Liu,Yan-Bo Zhang,Jie Zhang,Feng Feng,Wei Qu
A series of 4-O-substituted chrysotoxine (CTX) derivatives were designed, synthesized and evaluated as multifunctional agents for the treatment of Alzheimer's disease (AD). In vitro assays indicated that four ring substituted compounds (2a, 2b, 3i and 3j) exhibited significant neuroprotective effects against Aβ25–35-induced toxicity in PC12 cells. The four compounds also inhibited self- and Cu2+-induced Aβ1–42 aggregation and acted as biometal chelators. In particular, compound 2a was a potential lead compound for AD treatment (cell viability up to 100.78% at 50 µM in Aβ25–35-treated PC12 cells, 51.88% and 58.03% inhibition at 25 µM for self- and Cu2+-induced Aβ1–42 aggregation, respectively). A metal chelating experiment showed that compound 2a had a moderate interaction with Cu2+ and Al3+. Moreover, western blot analysis showed that compound 2a attenuated Aβ-induced tau protein hyperphosphorylation at Ser199/202 and Ser396 sites. Furthermore, compound 2a could efficiently cross the blood-brain barrier (BBB) by a parallel artificial membrane permeability assay (PAMPA). In summary, these results suggested that compound 2a was a promising multifunctional compound for AD therapy.
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PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2016
·Vol. 33
·期 4
·212-220
·
IF 4.367
Mei Lei,Wei Wu,Shuanglei Yang,Xingang Zhang,Zhuo Xing,Feng Ren,Xiangheng Xiao,Changzhong Jiang
The reduction of 4-nitrophenol (Nip) into 4-aminophenol (Amp) by NaBH 4 , which is catalyzed by both binary and ternary yolk–shell noble-metal/SnO 2 heterostructures, is reported. The binary heterostructures contain individual Au or Ag nanoparticles (NPs) and the ternary heterostructures contain both Au and Ag NPs. The Au@SnO 2 yolk–shell NPs are synthesized via a silica seeds-mediated hydrothermal method. Subsequently, the Au@SnO 2 @Ag and Au@SnO 2 @Au yolk–shell–shell (YSS) NPs are synthesized, whereby SnO 2 is located between the Au and Ag NPs. The morphology, composition, and optical properties of the as-prepared samples are analyzed. For the binary heterostructures, the rate of the reduction reaction increases with decreasing particle size. The catalytic results demonstrate the synergistic effect of Au and Ag in the ternary metal–semiconductor heterostructures, which is beneficial to the catalytic reduction of Nip into Amp. Both the binary and ternary heterostructures exhibit significantly better catalytic performances than the corresponding bare Au and Ag NPs. It is envisaged that the current synthesized strategy will promote further interest in the field of bimetal NP-based catalysis.
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TETRAHEDRON
·
2016
·
IF 2.645
Xiong-Wei Liu,Zhen Yao,Jun Yang,Zhi-Yong Chen,Xiong-Li Liu,Zhi Zhao,Yi Lu,Ying Zhou,Yu Cao
A facile and efficient methodology was developed for the synthesis of isoxazole-fused spiropyrrolidine oxindoles 3–5 via a 1,3-dipolar cycloaddition reaction of 3-methyl-4-nitro-5-alkenyl-isoxazoles with azomethine ylides (thermally generated in situ from isatin derivatives and proline or thioproline or sarcosine). Products bearing adjacent quaternary-tertiary centers were smoothly obtained in high yields (up to 90% yield) with good diastereoselectivity (up to 20:1). Furthermore, their biological activity has been preliminarily demonstrated by in vitro evaluation against human prostate cancer cells PC-3, human lung cancer cells A549 and human leukemia cells K562 by the MTT-based assays using the commercially available standard drug Cisplatin as a positive control. These results suggested that most of isoxazole-fused spiropyrrolidine oxindoles 3–5 showed considerable cytotoxicities to these three cell lines K562, A549 and PC-3, and that isoxazole-fused spiropyrrolidine oxindoles may be potential leads for further biological screening.
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TALANTA
·
2016
·
IF 4.035
Zhuomin Zhang,Cheng Zhao,Gongke Li
Achieving reproducible signals is a key point to improve the analytical precision and accuracy of surface enhanced Raman scattering (SERS) technique and further expand the application scope of SERS for on-site and rapid analysis of real sample with complex matrice. In this work, a novel Au@hydroxyl-functionalized polystyrene (Au@PS-OH) substrate was prepared by atom transfer radical polymerization and chemical assembly method, which possessed promised potential for the rapid and sequential analysis of multisamples coupling with SERS technique. Au@PS-OH substrate with regular nanoarrayed morphology possessed excellent anti-agglomeration capability even for testing solutions with strong basicity or acidity, mechanic and chemical stability due to the large amount of Au nanoparticles homogeneously and stably fixed on substrate surface. Moreover, excellent hydrophobicity of Au@PS-OH substrate could keep testing droplets of multiple samples stable and uniform spherical shape with similar contact angles to substrate, which guaranteed the reproducible SERS light paths and SERS signals during real sequential analysis. Then, an Au@PS-OH based SERS analytical method was developed and practically applied for the sequential determination of trace 4-aminoazobenzene in various textiles. It was satisfactory that the contents of trace 4-aminoazobenzene in black woolen, green woolen and yellow fiber cloth could be actually found and calculated to be 106.4, 120.9 and 140.8 mg/kg with good recoveries of 76.0-118.9% and relative standard deviations of 1.6-5.1%. It is expected that this SERS method is suitable for on-site and rapid analysis of multiple samples in a short period.
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2016
·
IF 2.196
Kaifei Zhao,Peng Yang,Shichao Du,Kangli Li,Xiaona Li,Zhenfang Li,Yumin Liu,Lanlan Lin,Baohong Hou,Junbo Gong
A laser monitoring dynamic method was used to determine the solubility of 4-aminobutyric acid in five mono-solvents of methanol, formamide, 1,2-propanediol, 1,3-propanediol and water, and (methanol + water) binary solvent mixtures over the temperature ranging from 283.15 K to 323.15 K at atmospheric pressure. It turns out to be that in different mono-solvents, the solubility of 4-aminobutyric acid is temperature dependent and increases with the increasing temperature. While in (methanol + water) binary solvent mixtures, the solubility is positively correlated with temperature and negatively correlated with the mole fraction of methanol. The modified Apelblat equation, λh equation and NRTL_Binary model were employed to correlate the solubility data in five mono-solvents. While in (methanol + water) binary solvent mixtures, the NRTL_Ternary model, CNIBS/R-K model and Jouyban-Acree models were applied. It is found that the correlated results are in good agreement with the experimental results. Furthermore, with the activity coefficients considered, solution mixing thermodynamics were calculated and the dissolution process of 4-aminobutyric acid is also discussed.
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SOLAR ENERGY
·
2017
·
IF 4.018
Yingli Pei,Jing Guo,Dongxing Kou,Wenhui Zhou,Zhengji Zhou,Qingwen Tian,Yuena Meng,Sixin Wu
The doping of indium into absorber layer has been proven to be beneficial for hybrid buffer structured Cu 2 ZnSn(S, Se) 4 (CZTSSe) solar cells, but it is difficult to precisely control the doping content only relying on In diffusion from In 2 S 3 emitter. Herein, we use the solution method to prepare In-substituted CZTSSe layer by directly doping In 2 Se 3 into metal chalcogenides precursor solution. The doping content can be precisely controlled and the influences of indium doping on cell performance are systematically discussed. Mott-Schottky and resistivity measurements indicate that the carrier concentration and charge transport process are monotonically enhanced with increasing In/(In + Sn) content (0 at.%, 3 at.%, 6 at.% and 12 at.%). The improvements of series resistance also lead to a monotonic increase of fill factor ( FF ) from 52.1% to 64.8%. Due to the larger recombination at high doping content, the 6 at.% In content device finally contributes the highest power conversion efficiency of 8.47%. It is expected that a precisely controlled indium doping could further improve cell performance for efficient hybrid buffer structured devices.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Ying-Hua Zhou,Suqin Wang,Yu Wan,Jingjing Liang,Yu Chen,Shizhong Luo,Cheng Yong
Low-cost metallic nanoparticles as catalysts with good performance are highly desired for the development of hydrogen storage materials . In this work, ceria-doped CuNi nanoparticles were successfully immobilized on the surfaces of reduced graphene oxide (rGO) by a simple co-reduction approach in aqueous solution at room temperature, characterized by ICP-OES, XRD , TEM, SEM-EDS and XPS techniques. The as-synthesized CuNi-CeO 2 /rGO nanocomposites with various metal contents had been employed as heterogeneous catalysts for the hydrolytic dehydrogenation of ammonia borane (NH 3 BH 3 , AB) under mild conditions. The optimal catalyst of Cu 0.8 Ni 0.2 -CeO 2 /rGO with CeO 2 content of 13.9 mol% exhibited an excellent catalytic activity with the exceedingly high TOF value of 34.4·mol H2 ·mol catalyst −1 ·min −1 at 298 K. The apparent activation energy was calculated to be 19.1 kJ mol −1 , even lower than most of noble-metal-based catalysts for AB dehydrogenation. The detailed kinetics of AB hydrolysis catalyzed by Cu 0.8 Ni 0.2 -CeO 2 /rGO had been investigated on different concentrations of catalyst, substrate and temperatures. Moreover, the obtained in situ hydrogen from AB hydrolysis can be further applied to reduce 4-nitrophenol with a high TOF value of 8.1 min −1 at room temperature. The high catalytic activity of Cu 0.8 Ni 0.2 -CeO 2 /rGO would be contributed to the small size of CuNi-CeO 2 NPs, metal-metal synergy, and the metal-support interaction.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2017
·
IF 2.299
Tong-Ying Chang,Chun-Li Hu,Dong Yan,Jiang-Gao Mao
Two new phosphates, non-centrosymmetric (NCS) (H 3 O)Ca 2 Zn 3.5 (PO 4 ) 4 and centrosymmetric (CS) Ba 2 Cd 3 (PO 4 ) 2 (HPO 4 ) 2 have been prepared by hydrothermal reactions . The single-crystal X-ray structural analyses have shown that they crystallized in space group P −42 1 c and P2 1 /c , respectively·(H 3 O)Ca 2 Zn 3.5 (PO 4 ) 4 features a three-dimensional (3D) network structure composed of ZnO 4 and PO 4 tetrahedra that are interconnected via corner-sharing, forming 1D channels of 6-MRs and 8-MRs which are filled by Ca 2+ and H 3 O + cations, respectively. Ba 2 Cd 3 (PO 4 ) 2 (HPO 4 ) 2 features a layered [Cd 3 (PO 4 ) 2 (HPO 4 ) 2 ] 4- composed of 1D chain of edge-sharing CdO 6 octahedra that are further bridged by PO 4 tetrahedra with Ba 2+ cations filling the interlayer spaces. Luminescent studies suggest that (H 3 O)Ca 2 Zn 3.5 (PO 4 ) 4 emits blue light. Optical diffuse reflectance spectra show the experimental band gaps for (H 3 O)Ca 2 Zn 3.5 (PO 4 ) 4 and Ba 2 Cd 3 (PO 4 ) 2 (HPO 4 ) 2 are 5.67 eV and 5.68 eV, respectively. The UV cut-off edge of title compounds are around at 218 nm·(H 3 O)Ca 2 Zn 3.5 (PO 4 ) 4 exhibits a very weak SHG response.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Nagaraj Basavegowda,Kanchan Mishra,Yong Rok Lee
Novel FeAgPt alloy nanoparticles were biosynthesized via ultra-sonication using the root extract of Platycodon grandiflorum . The nanoparticles exhibited enhanced catalytic activities in the reduction of 4-nitroaniline (4-NA) to p -phenylenediamine with a significantly reduced reaction time and increased rate constant because of their high number of active surface sites. In addition, the same catalyst exhibited enhanced catalytic activity in the decolorization of an environment polluting dye, rhodamine B (RhB). The time taken for the complete conversion of 4-NA to p -phenylenediamine was 25 min with an apparent rate constant of 10.06 × 10 −2 min −1 . Similarly, the catalytic decolorization of RhB took 15 min for complete decolorization of the dye molecules with a rate constant 25.60 × 10 −2 min −1 . The performance difference of mono, bi and trimetallic nanoparticles for both the reduction of 4-NA and decolorization of RhB was also examined. These trimetallic alloy nanostructures with excellent catalytic efficiency can also be used for other applications.
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TALANTA
·
2017
·
IF 4.162
Huijuan Wang,Siyu Zhang,Shufang Li,Jianying Qu
Herein, a newly developed electrochemical sensor base on the nanohybrid of palladium-reduced graphene oxide modified with gold nanoparticles (Au/Pd/rGO) was established, which was prepared by electrodeposing Au nanoparticles on Pd/rGO modified on a glass carbon electrode. The morphologies and microstructures of the as-prepared nanohybrid were characterized by X-ray photoelectron spectroscopy, Scanning electron microscopy and Infrared spectroscopy . And, experiment results showed that the prepared Au/Pd/rGO nanohybrid exhibited excellent electrocatalytic- activity toward the redox of acetaminophen (PA) and 4-aminophenol (4-AP) simultaneously. The linear detection ranges were 1.00–250.00 μM for PA and 1.00–300.00 μM for 4-AP, with the detection limits of 0.30 μM for PA and 0.12 μM for 4-AP, respectively. Because of the excellent performance of lower detection, wider linear range and better selectivity, the prepared Au/Pd/rGO nanohybrid with more potential applications was a promising candidate for advanced electrode material in electrochemical sensing field.
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