MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 12
·1-9
·
IF 5.705
Wang Yongping,Yue Qiaoli,Tao Lixia,Zhang Cong,Li Chen-Zhong
N/S/P-codoped carbon dots (CDs) are shown to be a viable fluorescent probe in a turn-off-on fluorometric assay for hydroquinone (HQ). The preparation of CDs was carried out using a one-step hydrothermal reaction starting with glyoxal and isocarbophos. The method is based on the formation of ground state complexes between CD and Fe(III) which leads to quenching of blue fluorescence (with excitation/emission peaks at 363/448 nm). On addition of HQ, it will be oxidized by Fe(III) upon which fluorescence recovers. This turn-off-on system can be utilized to quantify HQ. A linear relationship exists between fluorescence recovery and HQ concentration in range between 0.56 and 375 μM. The limit of detection is 0.16 μM. The assay was successfully applied to the determination of HQ in spiked water samples and developer samples.
Fluorometric determination of hydroquinone (with good selectivity over catechol and resorcinol) by using blue-emitting N/S/P-codoped carbon dots and the quenching effect of Fe(III).
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Junjian Zheng,Shaoping Xu,Zhichao Wu,Zhiwei Wang
Degradation of p -chloroaniline (PCA) was investigated using an electrochemical reactor with Ti/SnO 2 -Sb anode and cathodic electrochemical porous ceramic microfiltration (MF) membrane under galvanostatic control. Results showed that electrochemical degradation of PCA followed pseudo-first-order kinetics. At applied current 0.8 A and membrane flux 80 L m −2 h −1 , complete degradation of PCA (initial concentration of 0.6 mM) was achieved after 90-min electrolysis following adding 0.2 mM Fe 2+ at pH 3, with 75.1% of mineralization ratio and 46.7% of total nitrogen abatement. The production of OH via either anodic water oxidation or homogeneous and surface Fenton reaction was responsible for PCA degradation. The degradation pathways of PCA involving protonation, OH oxidation, and cathodic reduction were proposed by quantifying generated organic byproducts and inorganic nitrogen ions. Compared to cross-by operation, the cross-through operated EF system exhibited an enhanced oxidation power, leading to more efficient destruction of PCA and its toxic intermediate byproducts and improving electrical energy efficiency. This was ascribed to the increased ROS production and better contact of the contaminants with ROS present in the vicinity of membrane (cathode) surface induced by the enhanced mass transfer under membrane filtration. These results highlight the potential of the cross-through operated EF system to be used for the treatment of PCA-contaminated water and wastewater.
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CHEMOSPHERE
·
2018
·
IF 4.427
Xin Liu,Huahua Cai,Jing Zou,Zijun Pang,Baoling Yuan,Zhenming Zhou,Qingfeng Cheng
A sensitive spectrophotometric method (the N,N -diethyl- p -phenylenediamine (DPD) method) was established for the determination of trace permanganate concentration (0–10 μM) in water. The DPD method was based on the oxidative coloration reaction where permanganate could oxidize DPD to form the red colored DPD radical (DPD • + ) with a second-order rate constant of 2.96 × 10 4 M −1 s −1 at pH 6 (50 mM phosphate buffer). The generated DPD • + could be quantitatively measured at 551 nm using an UV–Vis spectrophotometer. There was a good linear relationship (R 2 = 0.999) between the absorbance of DPD • + and permanganate concentration. The DPD method was highly sensitive, and the absorbance of generated DPD • + at 551 nm was as high as 5.70 × 10 4 cm −1 per M (mol L −1 ) of permanganate. The reaction of permanganate with DPD in the pH range of 4.0–8.0 had a stoichiometric coefficient of 1:2.71. The residual absorbance of DPD •+ in ultrapure water and natural waters was fairly stable for 30 min. Limits of detection of the proposed DPD method in ultrapure water and natural waters were calculated to be as low as 0.010 μM and 0.017 μM, respectively. Moreover, trace permanganate concentrations of 0.04 and 0.10 μM were found in natural waters and wastewater by the proposed DPD method. Additionally, the DPD method could be applied to measure the second-order rate constants of the reaction of permanganate with phenol at pH 7.0 (28.2 M −1 s −1 ).
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Polymer Chemistry
·
2013
·Vol. 4
·期 10
·3020-3027
·
IF 5.231
Yangyi Sun,Yuyong Yin,Min Chen,Shuxue Zhou,Limin Wu
This paper presents a one-step procedure for the facile synthesis of monodisperse raspberry-like polymer colloidal particles by soap-free emulsion polymerization of styrene (S), acrylic acid (AA), and 3-(trimethoxysilyl)propyl methacrylate (MPS). In this method, when S, AA, and MPS are mixed with water and stirred at a certain temperature, raspberry-like P(S–MPS–AA) colloidal particles with uniform shapes and sizes could be obtained in a reliable manner. Both the core particles and the smaller corona particles of core surfaces were formed in situ. A mechanism of formation based on the second nucleation induced by MPS-enriched segments on the core surfaces is proposed.
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CRYSTENGCOMM
·
2012
·Vol. 15
·期 3
·560-569
·
IF 3.842
Zhifeng Jiang,Jimin Xie,Deli Jiang,Xiaojun Wei,Min Chen
Nickel nanoparticles with different sizes and morphologies were prepared with nickel chloride as the source of nickel and hydrazine hydrate as a reductant. Cetyltrimethyl ammonium bromide (CTAB), polyethylene glycol-10000 (PEG-10000), gelatin and their composites were used as modifiers in this research. The particles were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM) and Fourier transform infrared (FTIR). The effect of using single modifiers and their composites was investigated. The results revealed that the kind of modifier used had a significant effect on the morphology and size of the Ni nanostructure. The possible formation mechanism of nickel nanoparticles was also investigated. All of the formed nickel nanoparticles showed excellent catalytic activity in the reduction of p-nitrophenol compared to the commercial RANEY® Ni. The catalytic activity of nickel particles prepared in the presence of composite modifiers was higher than nano nickel catalysts prepared in the presence of single modifiers. The magnetic property, possible catalytic mechanism and the possibility of reusability were also investigated.
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Soft Matter
·
2014
·Vol. 11
·期 2
·290-296
·
IF 4.151
Shu Peng,Kui Wang,Dong-Sheng Guo,Yu Liu
Supramolecular polymeric vesicles are constructed by the complexation of p-sulfonatocalix[4]arene and chitosan, where the multivalent electrostatic interactions between the anionic sulfonate tetramer and cationic polyammoniums served as the dominant driving force. The supra-amphiphilic assemblies are disassembled upon exposure to a pH stimulus since the partial deprotonation of chitosan accompanied by a pH increase. Adding a competitive guest can also disrupt the assembly, representing the host–guest inclusion response. Interestingly, an abnormal temperature-response is observed, possibly as a result of the temperature-directed fusion process.
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DALTON TRANSACTIONS
·
2014
·Vol. 43
·期 21
·7924-7929
·
IF 4.097
Linyi Zhou,Ming Wen,Qingsheng Wu,Dandan Wu
Magnetic FeNi@Ni nanocables were prepared as a superior recyclable catalyst towards the hydrogenation reduction of p-nitrophenol to p-aminophenol through a two-step tunable assembly process in a solvothermal system. The proposed fabrication mechanism was verified through characterization by SEM, TEM, XRD, XPS, and UV-Vis. The as-prepared FeNi@Ni nanocomposites are core–shell-structured nanocables with Ni nanoparticles (NPs) attached on FeNi nanorods (NRs) surface loosely. The catalytic reactivity monitored by means of a UV-vis dynamic process shows FeNi@Ni nanocables can catalyse the transformation of p-nitrophenol to p-aminophenol completely under an ambient atmosphere at room temperature, and enable the catalysis to be more efficient than its counterparts FeNi NRs and Ni NPs due to the interfacial synergistic effect. Additionally, the resultant hierarchical metal–alloy nanocomposites possess ferromagnetic behaviour, and can be easily separated and recycled by an external magnet field for application.
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PROGRESS IN ORGANIC COATINGS
·
2016
·
IF 2.632
Huijing Li,Junjie Yuan,He Qian,Limin Wu
In this study, we have successfully introduced siloxane monomer, 2,4,6,8-Tetravinyl-2,4,6,8-tetramethylcyclotetrasiloxane (V 4 ) into the shell of silica/poly(methyl methacrylate-butyl acrylate) (SiO 2 /P(MMA-BA)) core–shell nanocomposite colloids via in-situ emulsion copolymerization. The obtained nanocomposite films with 50% silica content all show excellent transparency (nearly 100% transmittance in visible range) and film-forming property (T g under 30 °C). More importantly, the addition of V 4 can significantly increase the weathering durability of the film by improving the water repellency, cross-linking degree and UV-blocking property of the film.
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POLYMERS FOR ADVANCED TECHNOLOGIES
·
2017
·Vol. 29
·期 1
·442-450
·
IF 1.907
Suchen Jiang,Huanchao Liu,Xue Zhang,Yajun Ren,Xinxiang Cui,Xiaofeng Song
Electrospun biodegradable fiber mesh is a promising alternative scaffold for delivering progenitor cells for repairing damaged or diseased tissue, but its cripple mechanical stability has not met the requirement of tissue engineering yet. In this work, the well-defined poly(ε-caprolactone)-branched poly(methyl methacrylate- co -hydroxyethylmethacrylate) (PCL-PMH) has been successfully synthesized to toughen electrospun poly( l -lactide) (PLLA) fiber membrane. Characterization of the obtained nanofibrous meshes indicates that PCL-PMH and PLLA can be well blended to make smooth fibers, and fibrous diameter vary little with blending PCL-PMH. The aggregation state of two macromolecules is closely correlated with blend ratio, molecular structure, and molecular weight of PCL-PMH, and only when PCL-PMH and PLLA form good interfacial adhesion can PMH give full play to its potential for toughening the fiber membrane. The tensile strength and elongation at break of the blend are 6.20 MPa and 63.40% under the optimal conditions, respectively, and it also exhibits the representative feature of toughness materials. The blending fiber membrane is as no cytotoxic as original PLLA. This work will provide a new way for toughness of electrospun fiber membrane in practice.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Sisi Fan,Minggang Zhao,Longjiang Ding,Ye Ma,Jingjing Liang,Xingtao Wang,Yawen Song,Shougang Chen
Eggshell membranes were used as biotemplate to fabricate a 3D hierarchical porous Co 3 O 4 /ZnO p-n junction film. Multiple catalysis and accelerated electron transfer were achieved on the Co 3 O 4 /ZnO-GOx electrode by introducing the p-n junction interface into enzyme loading matrix. A stable and well-defined oxidation peak of glucose was obtained with a largely decreased detection potential of 0.25 V. Furthermore, an enhanced sensitivity (116.64 μA·mM −1 ·cm −2 ) was also achieved comparing with the simple biotemplate-synthesized Co 3 O 4 and ZnO film. The results demonstrated it is a novel strategy to improve the biosensing performance by introducing p-n junction interface into enzyme loading matrix.
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APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Xin Wang,Zhe Zhao,Dingrong Ou,Baofeng Tu,Daan Cui,Xuming Wei,Mojie Cheng
Ag/TiO 2 nanocomposites comprising of Ag clusters on TiO 2 nanocrystal surfaces are of great significance in catalysts and advanced functional materials. Herein a novel method to synthesize Ag/TiO 2 nanocomposites with Ag clusters under 2 nm on TiO 2 nanocrystal surfaces have been developed. The success of this method relies on a silver mirror reaction in toluene, which refers to the reduction of silver-dodecylamine complexes by acetaldehyde in the presence of mono-dispersed TiO 2 nanocrystals. The prepared Ag/TiO 2 nanocomposites have been characterized by FT-IR spectra, UV–vis absorption spectra, X-ray diffraction (XRD) analysis, ultra high resolution scanning electron microscope (Ultra-HRSEM), high resolution transmission electron microscope (HRTEM) and X-ray photoelectron spectra (XPS). Catalytic activity of Ag/TiO 2 nanocomposites is evaluated for the reduction of p -nitrophenol (4-NP) into p -aminophenol (4-AP) by NaBH 4 . Results demonstrate that Ag/TiO 2 nanocomposites have shown an outstanding catalytic activity as well as a good stability in successive reduction of 4-NP. Noticeably, TOF of Ag/TiO 2 -0.75 nanocomposites obtained in this work is the highest among Ag based catalysts previously reported.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2016
·Vol. 24
·期 1
·558-567
·
IF 2.76
Zhai Pingping,Chen Xuan,Dong Wenbo,Li Hongjing,Chovelon Jean-marc
This study aimed to investigate the degradation of triclosan (TCS) in the presence of p -aminobenzoic acid (PABA) under simulated sunlight irradiation ( λ ≥ 290 nm). The effect of PABA concentration, pH, dissolved organic matter (DOM), and DOM-hydrolytic Fe(III) species complexes on the photodegradation of TCS in the presence of PABA (TCS -PABA ) was also studied. The photolysis of TCS -PABA obeyed pseudo-first-order kinetics well, and the degradation of TCS -PABA enhanced with increasing solution pH (from 3.0 to 11.0). The presence of PABA inhibited the degradation of TCS -PABA , and the weakest inhibitory effect was observed while the concentration of PABA was 5 mg L −1 . The addition of DOM (Suwannee River fulvic acid standard I [SRFA], Suwannee River HA standard II [SRHA], and Suwannee River natural organic matter [SRNOM]) showed different inhibition effects on TCS -PABA degradation. However, higher Fe(III) concentration at the DOM concentration of 5 mg L −1 could favor the formation of DOM-hydrolytic Fe(III) species complexes, further accelerating the degradation of TCS -PABA . In comparison with deionized water (DI water), TCS -PABA could be better photodegraded in river water nearby the effluent of a wastewater treatment plant. This study provides useful information for understanding the natural behavior of TCS in the presence of other organic contaminants.
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