ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Chi Li,Yuanyuan Zhang,Ting Zeng,Xinyue Chen,Wenqian Wang,Qijin Wan,Nianjun Yang
To explore suitable sensing materials for sensitive and selective detection of phenolic pollutants, CeO 2 nanocubes, nanopolyhedras, and nanorods were synthesized by a hydrothermal method . These CeO 2 nanomaterials were further loaded on the support of graphene nanoplatelets . As-synthesized nanomaterials and nanocomposites were characterized using transmission electron microscopy , X-ray diffraction and Raman spectroscopy as well as electrochemical techniques including cyclic voltammetry , electrochemical impedance spectroscopy , and differential pulse voltammetry . The nanocomposite of graphene nanoplatelets with CeO 2 nanorods shows the highest electrochemical activity towards soluble species. Highly sensitive and selective determination of tetrabromobisphenol A, catechol , diethylstilbestrol , and nonylphenol was thus achieved at this nanocomposite based electrode. Their limits of detection were as low as 1.8, 42, 1.5 and 2.7 nM, respectively. Such an electrochemical sensor is thus promising for simple, fast and sensitive electrochemical determining of trace-leveled phenolic pollutants in water samples.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 20
·7646-7652
·
IF 3.069
Xiaolei Guo,Jin Zhang,Yanshuai Cui,Shengfu Chen,Haotian Sun,Qinghua Yang,Guanglong Ma,Longgang Wang,Jianxin Kang
The development of stable and biocompatible palladium nanoparticles (Pd NPs) catalysts has been drawing great interest. In this study, Pd NPs were prepared through a green method, where jujube polysaccharide (JP) was employed as both reducing and stabilizing agents for the first time. The JP stabilized palladium nanoparticles (Pdn-JP NPs) displayed small size, high stability, good biocompatibility and excellent catalytic efficiency. Pd50-JP NPs showed high stability up to two weeks in solutions of a wide pH range (4–9). Pd50-JP NPs showed negligible cytotoxicity against HeLa cells at a high concentration of up to 400 μg mL−1. Furthermore, Pdn-JP NPs showed excellent catalytic activity for reduction of 4-nitrophenol (4-NP) in the presence of sodium borohydride (NaBH4). The normalized rate constant (knor) and turnover frequency (TOF) of Pd50-JP NPs were as high as 38.4 s−1 mM−1 and 4455 h−1, respectively. The prepared Pdn-JP NPs will have various potential applications in bio-related catalysis in the future.
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DYES AND PIGMENTS
·
2020
·
IF 4.613
Xiaotian Yuan,Yujiao Tu,Wei Chen,Zhiwei Xu,Yunlin Wei,Kunhao Qin,Qi Zhang,Yingying Xiang,Hongcai Zhang,Xiuling Ji
A highly photoluminescent small-size carbon dots (CDs) deriving ampicillin sodium were successfully obtained via one-step hydrothermal method . The prepared CDs showed uniform particle size and possessed good excitation-dependent characteristic. The dead bacteria and yeast cells could be selectively stained by the CDs, but the live ones not. It indicated that the CDs possessed a good potential for the live/dead bacteria and yeast differentiation. Cell and plant leaf imaging showed that the prepared CDs possessed low biotoxicity, excellent biocompatibility and multicolor fluorescence emission properties making it a good candidate for bioimaging application. The probe exhibited high selectivity and sensitivity to detect Hg(II) and 2,4-dinitrophenol (2,4-DNP), and excellent linear range of 0–50 μM for Hg(II) (R 2 = 0.9920) and 0–25 μM for 2,4-DNP (R 2 = 0.9919), with low detection limits of 33.40 nM and 13.44 nM for Hg(II) and 2,4-DNP, respectively. It revealed that dynamic quenching mechanism dominated in Hg(II) quenching the CDs fluorescent, while the quenching mechanism of 2,4-DNP detection belonged to the inner filter effect. The sensor was successfully applied to determine the Hg(II) and 2,4-DNP in real water samples. It shows that the fluorescent nanoprobe shows great promising potential for the detection of environmental pollutants.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 12
·1-9
·
IF 5.479
Zhao Yanfang,Xie Hanyi,Zhao Mei,Li Huijuan,Chen Xiangfeng,Cai Zongwei,Song Hexing
Mesoporous carbon hollow spheres coated with MoS 2 (C@MoS 2 ) were synthesized to obtain a material with large specific surface area, fast electron transfer efficiency and good water dispersibility. The composite material was applied as a matrix for the analysis of small molecules by surface-assisted laser desorption/ionization time-of-flight mass spectrometry (SALDI-TOF MS). The use of a core-shell C@MoS 2 matrix strongly reduces matrix background interferences and increases signal intensity in the analysis of sulfonamides antibiotics (SAs), cationic dyes, emodin, as well as estrogen and amino acids. The composite material was applied to the SALDI-TOF MS analysis of selected molecules in (spiked) real samples. The ionization mechanism of the core-shell C@MoS 2 as a matrix is discussed. The method exhibits low fragmentation interference, excellent ionization efficiency, high reproducibility and satisfactory salt tolerance.
Schematic representation of the method for fabrication of MoS 2 -coated mesoporous carbon hollow spheres (core-shell C@MoS 2 ). As a new matrix, the nanocomposites were applied to analysis of small molecules by surface-assisted laser desorption/ionization time-of-flight mass spectrometry.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Yi Ren,Kaibin Tang,Wenqi Zhan,JingJing Luo,Miao Wang
As a typical noble nanomaterial , silver (Ag) nanoparticles have been widely used as a catalyst, but their performance is somewhat limited by self-aggregation. In this study, H 2 SrTa 2 O 7 nanosheet-supported ultrafine Ag nanoparticles (Ag/H 2 SrTa 2 O 7 ) were successfully synthesized, and the aggregation of Ag nanoparticles was effectively prevented. The Ag/H 2 SrTa 2 O 7 catalyst exhibited excellent activity in p -nitrophenol reduction and was successfully recycled 10 times without a substantial decrease in its catalytic activity. This superior catalytic activity could be ascribed to the large surface area of H 2 SrTa 2 O 7 nanosheets and the effective dispersion of Ag nanoparticles on the perovskite nanosheets. This work is important for the simple and green preparation of Ag catalysts with excellent catalytic performance on nontoxic perovskite nanosheets.
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高影响因子
CHEMICAL PAPERS
·
2019
·Vol. 74
·期 4
·1189-1197
·
IF 1.246
Feng Yinxia,Su Biquan,Xian Liang,Ma Yongjun,Sheng Li,Cao Ningjing
This paper presents the visible light-assisted synthesis of surfactant-free Pt nanoparticles (Pt-NPs) supported on multi-walled carbon nanotubes (MWCNTs) at ambient condition. Transmission electron microscopy (TEM) images indicate that Pt-NPs with high density and relative small in size (about 2 nm) were monodispersed on the surface of MWCNTs. The characterizations of Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), X-ray diffractometer (XRD) and ultraviolet–visible spectroscopy (UV–Vis) prove that visible light irradiation significantly affect the species distribution of [PtCl 4 ] 2− precursor in the hydrolysis and then promote hydrolysate Pt oxides loading on MWCNTs. The loading process decides the morphology of Pt-NPs rather than the following precursor reduction, which does not change the morphology but only the valance state of platinum. The catalytic activity of Pt/MWCNTs was tested in subsequent methanol electrochemical reactions and 4-nitrophenol (4-NP) reduction.
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高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2019
·
IF 4.046
Jianfeng Ma,Yazhuo Shang,Changjun Peng,Honglai Liu,Shuzhen Zheng,Hongxia Zhao,Shuai Qi,Qianping Ran
Air content can greatly affect the properties of concrete, therefore, the development of high efficient air-entraining agents is important. In this work, novel phosphate-modified polymers with different aryl substitutions were synthesized and used as highly efficient air-entraining agents. The structure of polymers was characterized by 1 H NMR and IR spectra. The foamability and foam stability of the different polymeric surfactants were tested in solutions. Surfactants with large steric hindrance, such as APP-6, showed superior performance of foamability and foam stability. In view of the excellent foamability properties of synthesized polymers in aqueous solution, the application of these polymers used in cement mortar as air-entraining agents were also evaluated for practical application. The surface tension, theoretical calculation and dynamic light scattering test for these polymeric surfactants were also studied. The synthetic aryl-polyether-phosphate surfactants showed higher surface activity, foamability, foam stability, and air-entraining performance compared with commercial air-entraining agent.
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2019
·
IF 4.182
Qiuliang Wang,Yunfei Liu,Qiuyu Meng,Yiling Zhu,Jun Xie,Yali Luo,Yinong Lyu
Porous carbons with predefined porosity and customizable pore structures are promising templates for the synthesis of highly dispersed metal nanoparticles . Herein, nitrogen-rich hierarchical porous carbon was synthesized using rationally designed microporous organic polymer as the precursor by high-temperature treatment with potassium hydroxide activation. Due to the meso-microporous structure and high Brunauer-Emmett-Teller (BET) surface area (2585 m 2 g −1 ), the resulting porous carbon has been employed as the catalyst support and silver nanoparticles (Ag NPs) were evenly dispersed on the surface or embedded within carbon matrix. Compared with polymer precursor-supported silver nanoparticles , the porous carbon-supported silver nanoparticles show higher catalytic activity in 4-nitrophenol reduction, which can be attributed to the smaller silver particles size (3.9 nm) and the hierarchical porous structure of the support material. The pseudo-first-order rate constant (k) and catalytic activity parameter (turnover frequency, TOF) is estimated to be 8.7 × 10 −1 min −1 and 1.90 × 10 −5 mol g −1 s −1 , respectively. This is the highest value reported to date for Ag-based catalysts. More importantly, the porous composite catalyst is highly stable, easy to recycle and reused without losing its catalytic activity. The present work opens new opportunities for the design and preparation of metal nanoparticles/porous carbon composite materials.
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高影响因子
TRANSITION METAL CHEMISTRY
·
2019
·Vol. 44
·期 7
·655-662
·
IF 1.016
Cui Yanshuai,Liang Bo,Zhang Jin,Wang Ran,Sun Haotian,Wang Longgang,Gao Dawei
Abstract Palladium nanoparticles (Pd NPs) have been drawing great interest as catalysts for water treatment. Herein, high molecular weight polyethyleneimine (PEI) (molecular weight: 70 kDa) was used as template to stabilize Pd NPs. PEI was incubated with disodium tetrachloropalladate, followed by reduction with sodium borohydride. Pd NPs had narrow size distribution with diameter from 3.64 to 6.20 nm. The PEI-stabilized palladium nanoparticles (Pd n -PEI NPs) showed excellent long-term stability and positive zeta potential in phosphate saline buffers with different pH values. In addition, Pd n -PEI NPs exhibited high efficiency for catalysis of 4-nitrophenol (4-NP) in aqueous solution. The catalytic reduction of 4-NP followed the pseudo-first-order behavior, which had the highest catalytic ability ( k nor = 229). The enhanced properties can be attributed to the high stability and smaller size of Pd n -PEI NPs in aqueous solution, resulting from the application of PEI template. This method can be used to prepare highly stable metal nanoparticles with potential applications in catalysis of polluted water in the future. Graphical abstract
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Advanced Materials Interfaces
·
2018
·Vol. 5
·期 11
·1800183
·
IF 4.834
Zhu Xiong,Tiantian Li,Fu Liu,Haibo Lin,Yun Zhong,Qing'an Meng,Qile Fang,Habib Sakil,Weijie Song
Chinese knot is a “traditional handicraft art” in Chinese culture, which is expected to ward off evil spirits and pray for good luck. It is constructed by weaving cords and tying different types of knots firmly. Inspired by Chinese knot, a robust 1D Ag nanowire membrane with nanoscale knots is fabricated to achieve robust catalytic/anti-bacterial separation. Silver mirror reaction is manipulated to anchor Ag nanowires on a hierarchical polyvinylidene fluoride membrane substrate. The robust Ag nanowire membrane withstands the vigorous cross-flow hydraulic shear (3000 mL min −1 ) for 24 h at 0.1 MPa without any physicochemical deterioration. The Chinese knot inspired membrane exhibits extraordinary robustness in continuous catalysis, “kill-release” anti-bacteria, oil-in-water emulsion, and ultrafiltration separation. This work paves a new way for constructing a robust 1D inorganic nanowire membrane for water remediation applications.
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高影响因子
TALANTA
·
2019
·
IF 4.916
Jie Ma,Lei Bian,Lei Zhao,Xiaotong Feng,Lizhi Zhao,Zhaoyan Wang,Qiaosheng Pu
Low-cost and nontoxic fluorescent reagents are important for on-site analysis performed by non-professionals. In this work, a cheap and widely available food additive , caramel was used as an effective fluorescence reagent for the sensitive detection of 2,4,6-trinitrophenol (TNP), 2,4-dinitrophenol (DNP) and 4-nitrophenol (4-NP). Through a simple dialysis, fluorescent components of a commercial caramel were harvested with a yield as high as 60%. The structural characterization demonstrated that the fluorescent components were dehydrated oligomers of carbohydrates. Their fluorescence can be quenched by these nitrophenols . The quenching mechanism was speculated as inner filter effect. At pH 8, a linear range of 0.2–22 μM and a detection limit of 90 nM could be achieved for TNP. Based on the difference of their quenching efficiency at different pHs, TNP, DNP and 4-NP can be simultaneously determined by solving the linear equations obtained at pH 3, 5 and 8. Successful detection of these nitrophenols in the water and soil samples was performed with relative standard deviations of 1.1–5.9% and recoveries of 95–108% of spiked standards.
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2018
·
IF 2.21
Mingming Guo,Yunfei Zhang,Feipeng Du,Yanguang Wu,Qiao Zhang,Can Jiang
In this work, silver nanoparticles/polydopamine coated polyvinyl alcohol (AgNPs/D-PVA) sponge were prepared via anchoring silver nanoparticles (AgNPs) on the inner wall of polyvinyl alcohol (PVA) sponge with dopamine as intermediate. The AgNPs/D-PVA were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) surface area analyzer, X-ray diffraction pattern (XRD), thermogravimetric analysis (TG) and ultraviolet–visible (UV–vis) spectroscopy. The catalytic activity of the AgNPs/D-PVA was evaluated for the reduction of 4-nitrophenol using NaBH 4 at room temperature. The coupling effect of dopamine enables AgNPs to be firmly anchored on the inner-wall of PVA sponges. AgNPs/D-PVA exhibits excellent catalytic performance for 4-NP and a good stability up to 4 cycles without a significant loss of its catalytic activity. This work develop a low-cost, high-performance and reusable of AgNPs/D-PVA sponge for the efficient and eco-friendly conversion of toxic 4-nitrophenol into harmless 4-aminophenol, which has potential application in sewage treatment.
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