JOURNAL OF MOLECULAR LIQUIDS
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2019
·
IF 4.561
Yi Li,Songwei Zhang,Qi Ding,Baofeng Qin,Litian Hu
Ionic liquids (ILs) are extensively used in many fields owing to their attractive characteristics. Good structure designability provides ILs an opportunity to integrate multiple functions into their structures, which could promote their industrial applications as versatile materials. In this study, three 4, 6-dimethyl-2-mercaptopyrimidine (DMMP) based phosphonium ILs were firstly synthesized. The corrosion inhibition behaviors of these ILs for mild steel in 0.5 M H 2 SO 4 aqueous solutions were investigated by electrochemical tests. Results indicated that all of the three ILs exhibited surprising inhibition efficiencies as high as 99%, even at an ultralow concentration of 0.1 mM. The ILs' adsorption behavior on surface obeys Langmuir isotherm, indicating that the ILs inhibit corrosion of mild steel by monolayer adsorption on the mild steel surface. Moreover, due to the superior adsorption capacity on steel surface, DMMP based ILs are expected have great application potentials as high-performance lubricating materials. As expected, DMMP based ILs showed excellent lubrication performances both at 30 °C and 100 °C as compared to PAO and 1-butyl-3-methylimidazolium tetrafluoroborate (LB104). Surface analyses indicated that tribofilms consist of ILs adsorption layer and tribochemical products, such as FeS, Fe 2 O 3 and organic compounds containing C O bonds, are responsible for the predominant lubrication performances. Therefore, versatile ILs designed in this paper have gathered two significant abilities for industrial applications, which are high corrosion inhibiting properties and excellent lubrication performances. This work is believed to be instructive for designing multifunctional ILs and promoting the ILs' application in industry in the future.
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高影响因子
ACS Applied Nano Materials
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2019
·
IF 0
Zhuojun Wei,Yangguang Li,Liguang Dou,Muhammad Ahmad,Hui Zhang
A series of bi-transition-metal hybrids Cu3–xNixAl-LDH/rGO (x = 2.5, 2.0, 1.5) were synthesized via a facile preadjusted pH citric-acid-assisted coprecipitation method. Systematic characterizations suggest that the hybrids show honeycomb-like nanosheets array morphology with ultrathin CuNiAl-LDH nanosheets (∼72.3 × 4.2 nm) staggered vertically grown on both sides of rGO substrate. The Cu3–xNixAl-LDH/rGO hybrids present a remarkably superior reduction performance for 4-nitrophenol (4-NP) than pure LDH samples. Particularly, Cu1Ni2Al-LDH/rGO shows the best activity with kapp = 3.4 × 10–2 s–1, ∼1.7-fold of Cu1Ni2Al-LDH. It is worth noting that the activity of this bitransition metals hybrid Cu1Ni2Al-LDH/rGO is 37% higher than our previously reported monotransition metal hybrid Cu1Mg2Al-LDH/rGO (kapp = 2.5× 10–2 s–1). These findings can be ascribed to (1) highly dispersed ultrasmall Cu2O nanoparticles (∼3.8 nm) instantaneously formed via in situ reduction of atomic-level dispersed Cu2+ ions in LDH layer lattices of the Cu3–xNixAl-LDH hybrids beneficial from clear isolation and stabilization effect of Ni–OH; (2) strong promotion of the doping of atomic-level dispersed Ni2+ ions in LDH and possible Cu2O–Ni–OH(CuNiAl-LDH)–rGO three-phase synergistic effect; and (3) enhanced adsorption capacity for reactants upon π–π stacking and the unique honeycomb-like nanosheet array morphology. The series of hybrids exhibit not only excellent reduction properties for varied aromatic nitro compounds but also good decolorization ability for anionic azo dyes. Further fixed bed experiments reveal that Cu1Ni2Al-LDH/rGO can efficiently decolorize the mixed solution of 4-NP and methyl orange at high flow rate (8 mL/min) with TOF of 1.68 × 10–3 s–1, suggesting great application potential of the as-obtained nanosheet array bi-transition-metal hybrids for water remediation.
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ELECTROCHEMISTRY COMMUNICATIONS
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2019
·
IF 4.197
Zhongping Li,Yuxin Zhang,Ruiqi Zhu,Guangming Wen,Chuan Dong,Hung-Wing Li
Loading metal nanoparticles on the surface of nanosheet supports is an attractive approach to enhancing their catalytic performance. Herein, palladium nanoflowers (Pd NFs) were prepared on amino-functionalized fullerene (C 60 -NH 2 ) by hydrothermal self-assembly using ethylenediamine (EA). Reduction of Pd ions resulted in the formation of Pd nanoflowers with a fullerene bottom layer and Pd petals. Ethylenediamine, a functionalized fullerene precursor, afforded a nitrogen-rich fullerene that ensures strong interactions between Pd 2+ and functionalized fullerene and improves the chemical and morphological stability of the resulting Pd nanoflowers. Compared with spherical Pd nanoparticles supported on amino-functionalized fullerene (C 60 -NH 2 ), the Pd nanoflowers (Pd NFs/C 60 -NH 2 ) exhibit greatly superior activity towards the reduction of 4-nitrophenol (4-NP). The nanoflowers exhibit not only a remarkable UV–vis response for the conversion of 4-nitrophenol to 4-aminophenol (4-AP) (99% in 2.0 min) with a turnover frequency of 12.35 min −1 but also a high electrochemical sensitivity to 4-nitrophenol over a wide linear concentration range (5–1000 μM), providing a detection limit of 0.09 μM (S/N = 3) at room temperature. The excellent catalytic stability and durability of Pd NFs/C 60 -NH 2 offer promising applications in catalysis.
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高影响因子
WATER ENVIRONMENT RESEARCH
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2019
·Vol. 91
·期 8
·770-779
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IF 1.24
Jinhong Fan,Hehe Qin,Yunfei Zhang,Simin Jiang
In this study, Fe/Cu bimetal composite was prepared by high-energy ball milling (BM) method for the removal of refractory organics. The BM Fe/Cu bimetal was characterized by SEM-EDS, XRD, and XPS. Evenly distributed Fe and Cu was observed in the EDS mapping. In contrasting experiments, the removal rate of 4-chlorophenol (4-CP) by BM Fe/Cu materials was about 10-fold faster than that by chemical substitution deposition (CSD) of Fe/Cu material. Complete 4-CP removal and 66.7% of total organic carbon (TOC) mineralization in the BM Fe/Cu–O 2 system were achieved. Dissolved oxygen plays a crucial role for 4-CP degradation through the in situ generation of reactive oxygen species (ROS) such as H 2 O 2 , ·OH, and via oxygen activation reactions. The predominant reactive radicals were identified to be and ·OH through ESR technique and inhibition experiments. The coexistence of oxidation and reduction of 4-CP in the BM Fe/Cu-O 2 system was proposed. Practitioner points 4-CP removal rate by BM Fe/Cu is 10-fold faster than that by CSD Fe/Cu at the same conditions. Complete 4-CP removal and 66.7% of TOC reduction were achieved. All three ROS including ·OH, , and H 2 O 2 coexisted in the BM Fe/Cu-O 2 system. A harmonious coexistence of oxidation and reduction mechanism was proposed.
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PubMed
高影响因子
Applied Sciences-Basel
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2019
·Vol. 9
·期 14
·2873
·
IF 2.217
Ruirui Han,Qiang Wu,Chihao Lin,Lingfeng Zhang,Zhicai Zhai,Ping Sun,Yingsen Fang,Jiaqiang Wu,Hui Liu
Featured ApplicationThis work provides basic data, application references and theoretical guidance of the UV/PDS process for the removal of PABA-type UV filters in water.AbstractIn this paper, the ultraviolet/persulfate (UV/PDS) combined oxidation process was used to remove the ethyl 4-aminobenzoate (Et-PABA), one of the typical 4-aminobenzoic acid (PABA)-type UV filters. The effects of various factors on the removal of Et-PABA using the UV/PDS process were investigated, and the degradation mechanisms of Et-PABA were explored. The results showed that the UV/PDS process can effectively remove 98.7% of Et-PABA within 30 min under the conditions: UV intensity of 0.92 mW·cm−2, an initial concentration of Et-PABA of 0.05 mM, and a PDS concentration of 2 mM. The removal rate of Et-PABA increased with the increase in PDS dosage within the experimental range, whereas humic acid (HA) had an inhibitory effect on Et-PABA removal. Six intermediates were identified based on HPLC–MS and degradation pathways were then proposed. It can be foreseen that the UV/PDS oxidation process has broad application prospects in water treatment.Keywords:advanced oxidation processes (AOPs);UV-activated;persulfate;ethyl 4-aminobenzoate (Et-PABA)
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2019
·
IF 3.858
Tao Sun,Liran Qi,Weiwei Li,Yan Li,Xiaomin Shuai,Zhiqiang Cai,Haipeng Chen,Xiaoguang Qiao,Lufang Ma
Efficient separation of aromatic amine isomers is a challenging issue in chemical industry and environmental analysis. Here we report the use of p -amino-tetradecyloxy-calix[4]arene (C4A-NH 2 ) as a novel stationary phase for gas chromatographic (GC) separations. The statically coated C4A-NH 2 capillary column showed a high column efficiency of 4332 plates/m for a 0.25 mm ID column and medium polarity. The C4A-NH 2 stationary phase exhibited an excellent separation performance both for aromatic amine isomers and a complex mixture of aliphatic analytes with a wide ranging polarity, showing distinct advantages over the commercial polysiloxane stationary phases via diversified molecular interactions covering H-bonding, π-π , van der Waals interactions and shape-fitting selectivity. The retention mechanisms of aromatic amine isomers on C4A-NH 2 column were further investigated by quantum chemistry calculations. In addition, the C4A-NH 2 column showed good column repeatability with relative standard deviation (RSD) values of 0.03%-0.07% for run-to-run, 0.10%-0.27% for day-to-day and 2.6%–5.7% for column-to-column, respectively, and thermal stability up to 240℃.
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PubMed
高影响因子
International Journal of Polymer Science
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2019
·
IF 1.892
Wei Xiong,Yue-kun Shen,Peng Dong,Ying Xiao,Xiong-qing Huang,Wen-qi Huang,Lu Yang,Xia Feng
Sustained release of anesthesia has shown great promise in the treatment of chronic pain in patients. In this research, we used neutralized ropivacaine as an anesthesia and poly(ε-caprolactone) (PCL) with different architectures to systematically study how these architectures affect the release of ropivacaine. After optimizing the parameters of the preparation of microspheres, ropivacaine-loaded 1-PCL microspheres and 4-PCL microspheres were obtained. Fourier Transform infrared spectra (FT-IR) and X-ray diffraction spectra (XRD) confirmed that ropivacaine was encapsulated within the microsphere rather than inserted on the surface of the microsphere. Ropivacaine was found to be buried deeper in the 1-PCL microsphere than in the 4-PCL microsphere. In vitro release assay revealed that small crystalline grains interfered with ropivacaine release in 4-PCL microspheres during the initial release period, but then two kinds of microspheres showed a similar ropivacaine release rate. We basically proved that the architecture of PCL has a negligible effect on ropivacaine release. Cell proliferation test revealed that the release of products from the microspheres resulted in insignificant toxicity towards mammalian cells.
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高影响因子
CERAMICS INTERNATIONAL
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2019
·
IF 3.45
Cai-Xia Li,Yue-Nan Hong,Bin Yang,Shan-Tao Zhang,Dan-Qing Liu,Xi-Ming Wang,Qian Liu,Lei Zhao,Wen-Wu Cao
Ba 0.70 Ca 0.30 Ti 1- x (Nb 0.5 Fe 0.5 ) x O 3 lead-free ceramics (abbreviated as BCTNF x , x = 0–0.12) were prepared by solid-state reaction method. The influence of B-site (Fe 0.5 Nb 0.5 ) 4+ substitution on phase structure, microstructure, dielectric , ferroelectric and piezoelectric properties of Ba 0.70 Ca 0.30 TiO 3 ceramics were systematically studied. The BCTNF x ceramics consist of diphasic tetragonal (T) and orthorhombic (O) phases at x = 0–0.04, pseudocubic (PC) and O phases at x = 0.05–0.08, cubic (C) and O phases at 0.08 < x ≤ 0.12. Increase of (Fe 0.5 Nb 0.5 ) 4+ doping improves sinterability, depresses the ferroelectric - paraelectric phase transition temperature ( T m ) monotonically from 128 °C at x = 0 to -86 °C at x = 0.12, induces enhanced relaxor behavior and weakens piezoelectric properties. The room temperature relative dielectric constant ( ε r ) and dielectric loss tangent (tan δ ) increase with increasing x and reach the maximum values of 4869 and 0.06 respectively at x = 0.06. Whereas the average grain size (abbreviated as AGS), ferroelectric properties and electric field induced strain increase significantly by introducing 2.0 mol% B-site complex cations (Fe 0.5 Nb 0.5 ) 4+ into Ba 0.70 Ca 0.30 TiO 3 ceramics. The BCTNF0.02 ceramics achieve optimal electrical properties with ε r = 1268, tan δ = 0.03, T m = 102 °C, P max = 12.8 μC/cm 2 , P r = 6.1 μC/cm 2 , E C = 6.0 kV/cm, d 33 = 117 pC/N, k p % = 0.18%, Q m = 236, bipolar S max % = 0.20%, unipolar S max % = 0.16% and d 33 ∗ = 314 pm/V. The variation of electrical properties of BCTNF x ceramics is attributed to the combined action of grain size effect, phase transition, weakness of octahedral distortion, clamping effects of the internal bias electric field E i on domain wall motion induced by B-site cations (Fe 0.5 Nb 0.5 ) 4+ displacement.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
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2019
·Vol. 55
·期 4
·1854-1864
·
IF 3.442
Zhang Zhizhong,Li Liang,An Duo,Li Hanxue,Zhang Xinghua
Novel triazine-based covalent organic polycalix[4]arenes, CalCOPs, were synthesized via the copolymerization of calix[4]arene derivatives and 2,4,6-trichloro-1,3,5-triazine (TCT) or 2,4-dichloro-1,3,5-triazine (DCT). The resulting CalCOPs have permanent pores that can be regulated by the variation of the alkyl chain lengths of the calixarene backbones and the reaction sites. With the alkyl chain length at the low rim in calixarene units increasing from ethyl to butyl during the reaction, the Brunauer–Emmett–Teller surface areas decrease with surface areas of 280, 31.5, 18.4 and 1.6 m 2 g −1 obtained for CalCOP1, CalCOP2, CalCOP3 and CalCOP4, respectively. Among these CalCOPs, CalCOP1 shows ultrahigh absorption for iodine capture in a water solution with an uptake of up to 232 wt%. Furthermore, the adsorption and release efficiency of iodine were obtained by using the UV–Vis spectroscopy. In addition, these polymers can be recycled at least five times while maintaining high removal capacity, suggesting that CalCOPs are ideal absorbent materials for reversible iodine capture in the mitigation of environmental issues.
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高影响因子
CARBOHYDRATE POLYMERS
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2019
·
IF 6.044
Shuangyu Xiong,Luminita Marin,Lian Duan,Xinjian Cheng
Nitroaromatic compounds, especially 2, 4, 6-trinitrophenol, have strong biological toxicity and explosive risks, so the detection of 2, 4, 6-trinitrophenol exhibit importantly practical and scientific significance. In this work, three fluorescence functionalized chitosan CNS 3 , CNS 4 and CNS 5 were prepared using chitosan as matrix. When 2, 4, 6-trinitrophenol (TNP) and/or p-nitrophenol (4-NP) was present in spot, these fluorescent chitosan sensors produced notable fluorescence quenching. It renders the chitosan sensing ability to detect TNP and 4-NP selectively and sensitively. The sensing mechanism is investigated as well. When introduced electron-rich moieties to the fluorescent chitosan, the sensitive detecting ability could be obtained. Excellent recognition ability could reach as low as 0.28 μM. The fluorescence fictionalization cause slight influence to the gel performance of chitosan.
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PubMed
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2018
·Vol. 22
·期 8
·2405-2412
·
IF 2.509
Mo Zunli,Niu Xiaohui,Gao Huhu,Li Zhenliang,Meng Shujuan,Guo Ruibin
A novel and simple chiral sensing platform had been successfully fabricated by means of amidation reaction between 3, 4, 9, 10-perylenetetracarboxylic acid (PTCA) and chitosan (CS) to form 3, 4, 9, 10-perylenetetracarboxylic acid–chitosan (PTCA–CS) composite film. Since CS has chiral center and PTCA has excellent electrical conductivity, the PTCA–CS composite modified glassy carbon electrode (PTCA–CS/GCE) could be treated as an effective electrochemical chiral sensor and applied for chiral discrimination of tryptophan (Trp) enantiomers theoretically. PTCA–CS composite was characterized by Fourier transform infrared (FTIR) spectroscopy and cyclic voltammetry (CV). When the prepared chiral sensing interface interacted with tryptophan isomers, a higher selectivity was received from D-Trp by differential pulse voltammetry (DPV). It indicated that the PTCA–CS/GCE can be treated as an electrochemical chiral sensor for the discrimination of Trp enantiomers. Further study demonstrated that the peak currents were linearly increased with the increasing percentage of L-Trp of Trp racemic mixture. Furthermore, the enantioselective interaction of the PTCA–CS/GCE was systematically studied by other experimental factors, such as the incubation time and acidity.
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高影响因子
POLYMER
·
2018
·
IF 3.483
Miaojun Xu,Kun Ma,Dawei Jiang,Jiaoxia Zhang,Min Zhao,Xingkui Guo,Qian Shao,Evan Wujcik,Bin Li,Zhanhu Guo
The effects of phosphazene based epoxy resin hexa-[4-(glycidyloxycarbonyl) phenoxy]cyclotriphosphazene (CTP-EP) as a synergistic agent on fire retardancy, thermal and mechanical properties of polyamide 6/aluminum diethylphosphinate (PA6/AlPi) composites were investigated. AlPi and CTP-EP presented an obviously synergistic flame retardant effect for the PA6 matrix. The PA6/AlPi/CTP-EP composites with a thickness of 1.6 mm successfully passed UL-94 V-0 rating with the limiting oxygen index value of 31.0% when the loading amount of AlPi/CTP-EP (mass fraction of 97/3) was 11 wt%. The incorporated CTP-EP improved the complex viscosity of PA6/AlPi/CTP-EP composites due to the chain extending reaction between the epoxide groups of CTP-EP and the terminal groups of PA6 matrix. The CTP-EP stimulated the formation of more sufficient and compact char layer during combustion. The higher melt viscosity and more compact char layer of PA6 composites further inhibited the volatilization of flammable gases, thus the ignition time of PA6/AlPi/CTP-EP composites was prolonged and the released heat was reduced. The introduction of CTP-EP simultaneously enhanced the flame retardant and mechanical properties of PA6/AlPi/CTP-EP composites compared with that of PA6/AlPi composites.
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高影响因子
危险品化学品经营许可证（带存储）