JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Yating Meng,Yuan Jiao,Yuan Zhang,Wenjing Lu,Xiaodong Wang,Shaomin Shuang,Chuan Dong
In this work, orange emission fluorescent multifunctional carbon dots (O-CDs) were designed for the label-free detection of vitamin B 12 (VB 12 )，endogenous/exogenous peroxynitrite (ONOO − ) sensing, cell imaging, and fluorescent flexible film preparation. The O-CDs with excitation-independent were prepared using safranine T and ethanol as precursors via one-step hydrothermal process. VB 12 was utilized as a quencher to quench the fluorescence of O-CDs due to the internal filtration effect (IFE). Two-segment linear ranges are 1–65 μM and 70–140 μM, and the detection limit was calculated as 0.62 μM. Besides, ONOO − can reduce the fluorescence intensity of O-CDs based on static quenching (SQ). The linear ranges are 0.3–9 μM and 9–48 μM, and the detection limit was 0.06 μM. Moreover, the O-CDs were exploited as a cellular imaging reagent for intracellular VB 12 and endogenous/exogenous ONOO − imaging owing to its great biocompatibility, low toxicity and strong photostability. These results indicate that O-CDs have the potential to be used as a sensitive fluorescence probe to rapidly monitor VB 12 and endogenous/exogenous ONOO − with high selectivity in living cells. Also, the as-proposed O-CDs can be employed to fabricate O-CDs/PVA composites as fluorescent flexible films. All of the above prove that the O-CDs present great prospect in multiple applications such as biosensing, cellular labeling, biomedical optical imaging, and fluorescent films.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2020
·
IF 7.183
Yanqing Xu,Suyang Yu,Guibin Peng,Arcadio Sotto,Huimin Ruan,Jiangnan Shen,Congjie Gao
Organic solvent nanofiltration (OSN) membranes have gained increasing attention for their wide applications in organic phase system. However, the fabrication method rather than the swelling behavior receives more attention during the OSN testing. In this work, a thin-film composite membrane with an internal cross-linking network by reacting 4,4-bipyridine with brominated poly (2,6-dimethyl-1, 4-phenylene oxide) (BPPO) has been prepared for organic solvent nanofiltration (OSN). The bipyridine groups substituted on the polyphenylene oxide polymer backbone act as cross-linkers and cationic channels for remarkable chemical stability and high solvent permeability. The permeability of the cross-linked BPPO (CBPPO) thin-film membranes exhibited high related to the viscosity and solubility parameter of solvents. The stability of CBPPO membrane was studied via various organic solvent immersing experiments. The result demonstrated that the composite membrane swelling changed to an extent of no more than 2.01%. It can be attributed to the low conformational flexibility of polymer chains with a high crosslinking degree. The ethanol permeation and dye rejection were compared before and after soaking. The calculation of the MWCO and membrane potential of modified CBPPO membranes showed that the swelling behavior of the CBPPO composite membranes is mainly affected by the membrane charge densities rather than the pore size.
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TALANTA
·
2020
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IF 5.339
Yuan Jiao,Yating Meng,Wenjing Lu,Yifang Gao,Yang Liu,Xiaojuan Gong,Yang Liu,Shaomin Shuang,Chuan Dong
A facile strategy for the preparation of nitrogen and phosphorus co-doped carbon dots (N, P-CDs) with long-wavelength emission is attractively proposed in one-pot hydrothermal strategy. The resulting N, P-CDs hold exceptional optical features and display excitation wavelength-independent properties with the emission wavelength at 590 nm, which enable it with the satisfactory relative quantum yield (QY) of 15.6% in long-wavelength region. In addition, the proposed N, P-CDs demonstrates specific selectivity towards ClO − over other competitive reactive oxygen species and exhibits rapid fluorescence response time to ClO − . Moreover, the N, P-CDs exhibits low-cytotoxicity and excellent cell membrane permeability for recognizing ClO − in SMMC-7721 cells, which demonstrates their enormous potential in biological system.
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高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 1
·116
·
IF 4.034
Cuiru Wang,Juanjuan Yin,Ran Wang,Tifeng Jiao,Haiming Huang,Jingxin Zhou,Lexin Zhang,Qiuming Peng
Polydopamine (PDA) nanoparticles can be used as an adsorbent with excellent adsorption capacity. However, nanosized adsorbents are prone to aggregation and thus are severely limited in the field of adsorption. In order to solve this problem, we utilized polydopamine in-situ oxidation self-polymerization on the surface of polycaprolactone (PCL)/polyethylene oxide (PEO) electrospun fiber after solvent vapor annealing (SVA) treatment, and successfully designed and prepared a PCL/PEO@PDA composite membrane. The SVA treatment regulated the microscopic morphology of smooth PCL/PEO electrospun fibers that exhibited a pleated microstructure, increasing the specific surface area, and providing abundant active sites for the anchoring of PDA nanoparticles. The PCL/PEO@PDA composite obtained by chemical modification of PDA demonstrated numerous active sites for the adsorption of methylene (MB) and methyl orange (MO). In addition, the PCL/PEO@PDA composites were reusable several times with good reutilization as adsorbents. Therefore, we have developed a highly efficient and non-agglomerated dye adsorbent that exhibits potential large-scale application in dye removal and wastewater purification.Keywords:electrospinning;solvent vapor annealing;structural regularity;polydopamine;dye removal
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JOURNAL OF MEMBRANE SCIENCE
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2019
·
IF 7.015
Shuhao Wang,Kaifeng Gu,Jian Wang,Yong Zhou,Congjie Gao
Preparation of novel swelling resistance membrane by interpenetrating an immiscible flexible polyisobutylene (PIB) polymer into a rigid polyamide (PA) network by interfacial polymerization. Due to the force interlocking of flexible PIB, polyamide network has high strength and excellent resistance to methanol. The PA layer was characterized by mechanical strength , attenuated total reflection fourier transforms infrared spectroscopy (ATR-FTIR), small angle X-ray scattering (SAXS), contact angle, field emission scanning electron microscope (FE-SEM) and atomic force microscope (AFM). RO membrane performances were evaluated based on small molecule alcohol (methanol and ethanol) solution of Safranin O. The results show that the flexible PIB interpenetrates well in the rigid polyamide network and improves mechanical strength and swelling resistance. With an increasing concentration of PIB from 0% to 0.30% in the organic phase during the fabrication, the mechanical strength of the PA layer becomes 2.8 times that of the original, and the rejection of Safranin O increased from 95.43% to 99.43%, and the permeability coefficient ( B s ) decreased from 5.22 to 0.47.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2019
·Vol. 137
·期 2
·48279
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IF 2.188
Yan Song,Fang-Fei Wang,Guan-Xiu Lu,Lin-Yuan Zhou,Qing-Biao Yang
Two kinds of PEI (Polyethyleneimine) nanofibers membrane were successfully prepared by electrospinning and crosslinking technology, which were insoluble in water. One Polyethyleneimine/ Epichlorohydrin/ Polyacrylonitrile nanofibrous films (abbreviated as PEI/ EPI/ PAN NFs) was prepared by in situ crosslinking of PEI/PAN nanofiber containing of EPI, and the other PEI/ PAN/ EPI NFs was prepared by crosslinking PEI/ PAN nanofibers using EPI solution. The composition and morphology of nanofibers before and after crosslinking were investigated by infrared spectroscopy and scanning electron microscopy. PEI/EPI/PAN nanofibers exhibited excellent adsorption properties toward heavy metal ions and methyl orange dyes, which can also be reused multiple times. The adsorption rate of methyl orange remained around 75% after 4 cycles, meanwhile, the adsorption rate of copper and lead still remained around 90% after 5 cycles. In addition, we found that PEI/ PAN/ EPI nanofibers prepared by solution crosslinking technology solved the problem of easy gel formation in in situ crosslinking technology and facilitated the continuous production of PEI/ EPI/ PAN nanofibers, which is better than in situ crosslinking technology. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48279.
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RSC Advances
·
2018
·Vol. 8
·期 35
·19659-19667
·
IF 2.936
Bhavani P. Nenavathu,Syam Kandula,Swati Verma
Photocatalysts suffer from a lack of separation of photogenerated excitons due to the fast recombination of charge carriers, so a strong synergistic effect exhibited by photocatalysts is promising for effective photocatalysis. Herein, we have synthesized efficient visible light functionalized graphene oxide nanosheet (FGS)/ZnO nanocomposite photocatalysts via a simple and economical approach with large scale production for practical applications. A series of nanocomposites (FGS/ZnO NCs) with different amounts by weight of graphene oxide (GO) have been synthesized via a facile solution route followed by calcination under environmental conditions. The phase, purity and morphological studies of the synthesized FGS/ZnO NCs were carried out using powder X-ray diffraction (XRD) and transmission electron microscopy (TEM). The optical properties were studied using UV-visible diffuse reflectance spectroscopy (DRS) and photoluminescence spectroscopy (PL). XRD results confirm the formation of a pure phase of ZnO in the FGS/ZnO NCs and TEM results show strongly adhered ZnO NPs on the surface of the FGS. DRS results confirm the extension of light absorption in the visible region while PL results confirm the effective separation of charge carriers in 0.09 wt% FGS/ZnO NCs. The synthesized photocatalyst efficiently degrades carcinogenic safranin-T dye under visible light illumination which is reported for the first time using FGS/ZnO nanocomposites. Photocatalytic studies confirm the higher photocatalytic activity of 0.09 wt% FGS/ZnO NCs (about 94.5%) towards the photodegradation of safranin-T dye in aqueous solution under visible light. The improved photocatalytic activity of 0.09 wt% FGS/ZnO NCs can be ascribed to the integrative synergistic effects of the enhanced adsorption capacity of safranin-T dye, effective separation of photogenerated excitons and effective interfacial hybridization of FGS and ZnO NCs. The generation of reactive oxygen species was confirmed using terephthalic acid as a probe molecule and a scavenger test was conducted in presence of histidine.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 21
·17317-17322
·
IF 3.201
Chang Liu,Peng Wang,Xueke Liu,Xiaotong Yi,Zhiqiang Zhou,Donghui Liu
The quaternary ammonium herbicides mainly include paraquat and diquat, whose fast and simultaneous detection is important for environmental and public safety. Herein, we simultaneously analyzed paraquat and diquat by a simple three-component supramolecular sensor array, which was simply prepared from carboxymethyl-β-cyclodextrin (CM-β-CD) and fluorophores. Under the optimal pH, the two herbicides were excellently distinguished in the principal component analysis (PCA) score plot in the presence of various interferences. Then, the results of semi-quantitative analysis through linear discrimination analysis (LDA) also showed good cluster separation for both paraquat and diquat in the concentration range of 10–250 μM. Moreover, in order to test the unknown samples, the support vector machine (SVM) regression model was applied for simultaneous quantitative analysis of paraquat and diquat, which was successful in the prediction of the amount of the two analytes. Accordingly, this simple supramolecular sensor array is expected to be applied in the rapid and accurate analysis of quaternary ammonium herbicides.
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FOOD CHEMISTRY
·
2018
·
IF 4.946
Tong Bu,Qiong Huang,Lingzhi Yan,Wentao Zhang,Leina Dou,Lunjie Huang,Qingfeng Yang,Bingxin Zhao,Baowei Yang,Tao Li,Jianlong Wang,Daohong Zhang
Here, a facile, label-free and sensitive lateral flow strip (LFS) biosensor for foodborne pathogens was established relying on the innovative introduction of Gram staining and the direct immunoreaction. Target bacteria can be directly marked with crystal violet (CV) by one-step staining which is superior to traditional signal marking techniques in LFS assay, and the method’s selectivity can be guaranteed by high-specificity monoclonal antibody. With Salmonella Enteritidis ( S. Enteritidis) as a model target, this protocol can selectively detect 80 CFU mL −1 S. Enteritidis within 11 min in the optimized conditions. Moreover, with Listeria monocytogenes as another model target, the biosensor shows a high universality for detections of both gram-negative and gram-positive bacteria. The unexpected applicability of biological dye tracer in strip biosensor reveals that the biological dye can be a potential tool serving as a universal signal tracer for pathogenic microorganisms in food safety monitoring and early clinical diagnosis.
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高影响因子
CLEAN-Soil Air Water
·
2013
·Vol. 41
·期 10
·992-1001
·
IF 2.046
Sui Wang,Jing Wei,Shasha Lv,Zhiyong Guo,Feng Jiang
A magnetic-sulfonic graphene nanocomposite (G-SO 3 H/Fe 3 O 4 ) was synthesized and characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray diffraction. It was used for removal of three cationic dyes: safranine T (ST), neutral red (NR), victoria blue (VB), and three anionic dyes: methyl orange, brilliant yellow, and alizarin red, from environmental water. The experimental conditions were optimized, including pH, amount of adsorbent, adsorption kinetics, adsorption isotherms, ionic strength, etc. The results show that G-SO 3 H/Fe 3 O 4 can adsorb cationic dyes more efficiently and selectively than anionic dyes at pH 6.0. In the first 10 min of adsorption time, more than 93% of the cationic dyes were removed by the sorbent. Adsorption kinetics follow the pseudo-second-order kinetic model well. The adsorption isotherm coincided with Langmuir and Freundlich adsorption models. The maximum adsorption capacities of G-SO 3 H/Fe 3 O 4 for ST, NR, and VB dyes were 199.3, 216.8, and 200.6 mg g −1 . The adsorbed cationic dyes were eluted by using different pH values of ethanol as the solvent. The established method was simple, sensitive, and rapid, and was suitable for the adsorption of cationic dyes in environmental water.
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ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Li Zhang,Hetong Qi,Jie Hao,Lifen Yang,Ping Yu,Lanqun Mao
Developing water-stable and adaptive supramolecular materials is of great importance in various research fields. Here, we demonstrate a new kind of water-stable, adaptive, and electroactive supramolecular ionic materials (SIM) that is formed from the aqueous solutions of imidazolium-based dication and dianionic dye (i.e., 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid), ABTS) through ionic self-assembly. The formed SIM not only shows good thermostability and unique optical and electrochemical properties that are raised from precursors of the SIM, but also exhibits good water-stability, salt-stability, and adaptive encapsulation properties toward some heterocyclic cationic dye molecules. UV–vis and FT-IR results demonstrate that this encapsulation property is essentially based on the electrostatic interactions between the guest dye molecules and ABTS in the SIM. The application of the SIM prepared here is illustrated by the development of a new electrochemical sensor for NADH sensing at a low potential. This study not only opens a new avenue to the preparation of the supramolecular materials, but also provides a versatile platform for electrochemical (bio)sensing.
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MICROCHIMICA ACTA
·
2015
·Vol. 182
·期 13
·2313-2320
·
IF 3.741
Xu Yan,Jin Jingjie,Li Xianliang,Han Yide,Meng Hao,Song Chaosheng,Zhang Xia
We describe a facile method for the preparation of magnetic microparticles consisting of a metal-organic framework (MOF) of Cu(II)-BTC (BTC = 1,3,5-benzenetricarboxylate) for rapid magnetic solid-phase extraction (MSPE) of the dye Congo Red (CR) from aqueous solution. Magnetization of the MOF and solid-phase extraction of CR was simultaneously accomplished by mixing, under ultrasonication, the MOF and silica-coated magnetite microparticles in the solution to be extracted. Under optimized conditions, the magnetic MOF hybrid exhibits a fast adsorption rate and a high removal efficiency (>97 %) toward CR even over 15-fold reuse, which also features high adsorption capacity of 97.7 and 92.5 % for cationinc Methylene Blue (MB) and Crystal Violet (CV), respectively. The desorption of CR from the magnetic MOF was realized by washing it with ethanol and water. The material is considered to be a promising new adsorbent for use in wastewater treatment and in analytical preconcentration.
We report on a method for magnetization of a Cu-BTC metal-organic framework for use in rapid magnetic solid phase extraction of Congo Red from aqueous solutions. The material maintains its high removal efficiency (of >97 %) over 15 recyclable experiments.
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