CELLULOSE
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2018
·Vol. 25
·期 12
·7381-7392
·
IF 3.809
Zhao Jiangbin,Agaba Aphra,Sui Xiaofeng,Mao Zhiping,Xu Hong,Zhong Yi,Zhang Linping,Wang Bijia
Abstract Recyclable reactive dyeing of cotton fabrics was achieved in a heterogeneous non-aqueous binary solvent system. Ethyl octanoate (EO) and dimethyl sulfoxide (DMSO) were selected as exhaustion medium and solvating medium respectively. The solvents were immiscible at room temperature but formed a continuous phase upon heating and agitation, allowing for simple separation after dyeing. Sufficient swelling of the cotton fabric and excellent dye substantivity could be achieved by tuning ratio of the DMSO and EO. Compared with conventional aqueous dyeing, the solvent-based process required up to 40% less amount of dye and no inorganic salts. The dyeing sequence could be repeated 10 times. At the end of each dyeing cycle, 98.5 v% each of EO and DMSO was recovered and reused. The process was generally applicable to commercial monochlorotriazine dyes with consistently good shade build-up and colorfastness. Therefore, the heterogeneous DMSO/EO dyeing system provides a promising solution to the environmental problems associated with reactive dyeing of cotton in a source-controlled manner. Graphical abstract
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高影响因子
CATALYSIS LETTERS
·
2018
·Vol. 149
·期 3
·665-671
·
IF 2.911
Lyu Xinyu,Wang Wencheng,Sun Yiqun,Zhao Qian,Qiu Tao
Abstract An ionic liquid catalyzed Friedel–Crafts alkylation reaction of substituted benzenes with CCl 4 was developed. The reaction proceeded efficiently under mild conditions, gave corresponding trichloromethylarenes with diversity functional groups in moderate to good yields. The influence of Lewis acidity of ionic liquids on the conversion of the alkylation reaction has been investigated. Notably, the probable mechanism of this reaction has been proposed with the assistance of 27 Al NMR spectroscopy. It was noteworthy that the predominance of [Al 2 Cl 7 ] − species in EmimCl–AlCl 3 , N = 0.67 could be detected by 27 Al NMR spectral analysis, and [AlCl 4 ] − was generated at the beginning of reaction. Additionally, it was found that [AlCl 4 ] − could be transformed into [Al 2 Cl 7 ] − when the reaction finished. Some control experiments confirmed that the interaction between Lewis acidic species [Al 2 Cl 7 ] − of the ionic liquid and CCl 4 led to the change in speciation of aluminum during the alkylation reactions. Graphical Abstract
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高影响因子
CELLULOSE
·
2018
·Vol. 25
·期 11
·6691-6704
·
IF 3.809
Li Yun,Yu Qiao,Yin Xianze,Xu Jing,Cai Yajun,Han Lu,Huang Hao,Zhou Yingshan,Tan Yeqiang,Wang Luoxin,Wang Hua
Abstract Superhydrophobic material involves the fabrication of appropriate roughness and low surface energy. Studies concerning enhancing the attachment between substrates and low surface energy material have been reported. Hence, it might also be feasible to make low surface energy material as an interface binder to enhance the attachment. In our work, the simple dip-coating method was used to fabricate polybenzoxazine (PBZ)/SiO 2 -coating cotton (PBZSC) fabric for rapid oil–water separation. The surface morphology and wettability of the PBZSC fabric as well as the properties of the separation were explored using various methods. These results demonstrated that PBZSC fabric not only had excellent thermal properties, but also maintained excellent superhydrophobicity (WCA > 150°) under various harsh conditions which was mainly attributed to higher surface roughness contributed by SiO 2 and lower surface energy, heat resistance as well as acid and alkali resistance from PBZ resin, respectively. More importantly, the separation conducted by the PBZSC fabric not only showed great recycle property, but also separated a series of oil and water mixtures with up to 96% separation efficiency. Therefore, it is anticipated that this low-cost PBZSC fabric will be readily and widely utilized in designing multifunctional membrane for large-area oil-spill cleanup without using fluoropolymers or silicones. Graphical abstract
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高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2018
·Vol. 319
·期 1
·69-73
·
IF 1.181
Duan Xiaoyan,Li Jianbo,Lu Xiaoling
In the field of nanotechnology, DNA-based nanoscale materials have facilitated the construction of DNA polyhedrons with different shapes and sizes by using predictable base pairing and highly tunable conformation. In this study DNA bipyramid nanostructures with one arm chain (T20-DBNs) were successfully prepared in a single annealing procedure. 99m Tc-A20 ssDNA was obtained by radiolabeled DTPA-A20 with 99m Tc, and then 99m Tc-DTPA-DBNs were obtained by hybridizing T20-DBNs with 99m Tc-A20 ssDNA. We focused on studying a method of 99m Tc radiolabeling DNA nanostructures with DTPA as a chelate, and hoped to develop a new SPECT molecular imaging probe based on DNA nanostructures.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 24
·20580-20587
·
IF 2.324
Fang Lu,Xue Yan,Hu Xing-Ming,Xie Dong,Li Wen-Jun
Electrochemiluminescence (ECL) is a very sensitive method for trace analysis because of its background interference and high signal-to-noise ratio. In the past decade, the determination of Cu 2+ in environment has attracted considerable attention since it plays an essential role in many physiological processes. Herein, a novel ECL sensor based on C,N quantum dots embedded g-C 3 N 4 nanosheets (C,N-QDs@NSs) was constructed for the detection of Cu 2+ . The nanocomposite was rapidly obtained via the oxidation of normal g-C 3 N 4 in H 2 O 2 solution using sonochemical synthesizing method. Due to the abundant surface defects on C,N-QDs@NSs, the ECL intensity was magnified 2.5 times for using a C,N-QDs@NSs electrode in comparision to a g-C 3 N 4 modified electrode. Besides, C,N-QDs@NSs could accelerate the rate of electron transfer in ECL reaction and thus resulted in the lower cathodic peak potential. Significantly, Cu 2+ could effectively quench the ECL of C,N-QD@NSs, which endowed C,N-QD@NSs with a great advantage in the ECL detection of Cu 2+ . under optimum conditions, C,N-QDs@NSs modified electrode exhibited a linear detection range from 5 × 10 −4 to 10 µM with a detection limit of 2 × 10 −4 µM (S/N = 3) for Cu 2+ , and was finally applied to detect Cu 2+ in real samples with satisfactory results.
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高影响因子
MACROMOLECULAR RESEARCH
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2018
·Vol. 26
·期 10
·892-899
·
IF 1.767
Huang Mengjia,Li Jie,Chen Jia,Zhou Mi,He Jianguo
The wound healing for tympanic membrane (TM) perforations is one of the most common clinic treatment. New designs of biomaterials, and lately tissue-engineered composites and grafts, have been applied for the management of TM perforation. In this work, a series of chitosan (CS)/polyvinyl alcohol (PVA) nanofibrous films have been fabricated as a kind of patch for repairing TM perforation. The scaffolds were crosslinked by glutaraldehyde solution to prevent them from being dissolved in the culture medium. The morphology of nanofibers from different precursors has been observed by using scanning electron microscopy (SEM). And the crosslinked films have been characterized by SEM and Fourier transform infrared spectroscopy for confirming its morphology and chemical structure. We found the films with crosslinking showed stronger tensile strength and modulus compared to the uncrosslinked one. And the mechanical properties could be tuned by the crosslinking time. In addition, after crosslinked, the films showed good thermostability and water-resistance, characterized by thermo gravimetric analyzer and contact angle meter. The cell viability studies with human umbilical vein endothelial cells, fibroblasts and mesenchymal stem cells demonstrated that the nanofibrous scaffolds formed by electrospinning process had no side effects for cell proliferation. However, a better way of crosslinking CS/PVA films needs to be further studied.
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高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
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2018
·Vol. 26
·期 12
·4311-4320
·
IF 1.971
Wu Chengyi,Zhang Xu,Li Cong,Cheng Chao,Zheng Yin
A novel sodium alginate-grafted poly(acrylic acid)/graphene oxide (NaAlg-g-PAA/GO) composite hydrogel was prepared via ultraviolet irradiation, and characterized by infrared spectroscopy spectrometer. X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy. It was employed to adsorb NH 4 + from aqueous solution and used as slow-release nitrogen fertilizers (SNFs). Result indicated that the adsorption process for NH 4 + reached equilibrium within 50 min, with the adsorption capacity of 6.6 mmol g −1 even if 30 wt% GO was incorporated. The results of adsorption kinetic and isotherm were well described by the pseudo-second-order and Freundlich model. The thermodynamics analysis showed the adsorption process was spontaneous. The study indicated excellent water-holding ratio of soil with 2 wt% SNFs was 81.2%, and nitrogen release was up to 55.1% within 40 days in soil. Overall, NaAlg-g-PAA/GO could be considered as an efficient adsorbent for the recovery of nitrogen with the agronomic reuse as a fertilizer.
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高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 9
·1-7
·
IF 5.705
Liu Yufei,Yan Huijuan,Shangguan Jingfang,Yang Xue,Wang Meili,Liu Wei
A fluorometric aptamer-based assay for ochratoxin A (OTA) is described. It is making use of magnetic separation and a cationic conjugated fluorescent polymer. Amino-tagged aptamer (Apt) against OTA is immobilized on magnetic beads (MBs) to form a conjugate of type Apt-MBs. The immobilized aptamer is partially complementary to carboxyfluorescein-labeled DNA which binds to the Apt-MBs via hybridization if OTA is absent. Only few FAM-DNA will remain in the supernatant after magnetic separation, and only weak fluorescence resonance energy transfer (FRET) occurs on addition of the fluorescent polymer. If, however, OTA is present, it will bind to the aptamer and prevent the hybridization between Apt-DNA and FAM-DNA. This results in the presence of large amounts of FAM-DNA in the supernatant after magnetic separation. On addition of fluorescent polymer, efficient FRET occurs from the polymer to FAM-DNA. Fluorescence, best measured at excitation/emission peaks of 370/530 nm, increases with increasing concentrations of OTA. This assay is highly sensitive and selective. The detection limit is as low as 0.11 ng mL −1 . This is 6 times lower than the aptamer assay without using the fluorescent polymer. Conceivably, this method has a wider scope in that it may be extended to other mycotoxins by simply changing the aptamer.
Schematic of a fluorometric aptamer assay for ochratoxin A (OTA). It is based on magnetic separation coupled with a cationic conjugated polymer (PFP).
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PubMed
高影响因子
CATALYSIS LETTERS
·
2018
·Vol. 148
·期 6
·1739-1749
·
IF 2.911
Wang Hongli,Gao Dawei,Wang Liying,Chi Yue,Wang Minggang,Gu Yan,Wang Cong,Zhao Zhankui
Abstract The effective storage and generation of hydrogen at room temperature is an important issue in many areas, including alternative energy. In this work, NiCoB nanoalloys with high B contents, clean surfaces, and good dispersions are synthesized by an in-situ reduction method. The NiCoB catalyst with high B content exhibits significantly more excellent catalytic activity for hydrogen generation from the hydrolytic of ammonia borane than NiCoB catalyst with low B content. The remarkable catalytic performance is attributed to the strong electronic interaction between the incorporated B and the active metal sites of Co and Ni, the clean surface and good dispersion of the catalyst. Basically, the physical and catalytic properties of the catalyst take advantage of the selection of reductant used during the in-situ synthesis of the NiCoB nanoalloys. This work demonstrates that this facile synthetic method is a promising avenue for the rational design of various B incorporated metal catalysts for hydrogen energy exploitation, metal/air batteries, and electrochemical sensors. Graphical Abstract
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高影响因子
WATER AIR AND SOIL POLLUTION
·
2018
·Vol. 229
·期 4
·1-10
·
IF 1.769
Dai Ying,Lv Riwen,Huang Dejuan,Tao Qinqin
Humic acid (HA) plays an important role in the migration and transformation of uranium in natural waters. To effectively remove uranium in the presence of HA, a bifunctional polymer, diethylenetriaminepentaacetic acid cross-linked β -cyclodextrin (DTPA- β -CD), was synthesized by polycondensation reaction. The sorption performance of DTPA- β -CD in functions of pH, ionic strength, contact time, initial time, and temperature were explored batch wise. Experimental results showed that DTPA- β -CD could concurrently sorb uranium and HA around pH of 3.0. The sorption strongly depended on pH and on ionic strength, demonstrating outer-sphere surface complex in nature. Two sorption kinetics well followed pseudo-second-order model. Sorption isotherm accorded with Sips model. Increasing temperature facilitated uranium and restrained HA sorption. This work demonstrated that DTPA- β -CD was a promising material for sorbing uranium in the presence of HA.
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高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 4
·1-6
·
IF 5.705
Wang Yi,Zhang Pu,Lu Qing,Wang Yue,Fu Wensheng,Tan Qin,Luo Weiping
A method is described for the fluorometric determination of hypochlorite. It is making use of molybdenum disulfide quantum dots (MoS 2 QDs) as a fluorescent probe. The QDs are prepared by hydrothermal reaction of sodium molybdate with glutathione. They possess diameters typically ranging from 1.4 to 3.8 nm, excellent stability in water, and blue photoluminescence (with excitation/emission peaks located at 315/412 nm and a quantum yield of 3.7%). The fluorescence of the QDs is statically quenched by hypochlorite, and the Stern-Volmer plot is linear. Hypochlorite can be detected in the 5–500 μM concentration range with a 0.5 μM detection limit. The method has been successfully applied to the determination of hypochlorite in spiked samples of tap water, lake water, and commercial disinfectants.
Schematic of a method for the fluorometric determination of hypochlorite using MoS 2 quantum dots as a fluorescent probe. It has been applied to hypochlorite assay in spiked samples of tap water, lake water, and commercial disinfectants.
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PubMed
高影响因子
Nano Research
·
2018
·Vol. 11
·期 4
·1905-1916
·
IF 7.994
Jia Nan,Weng Qiang,Shi Yaru,Shi Xinyan,Chen Xinbing,Chen Pei,An Zhongwei,Chen Yu
Highly efficient metal-free, carbon-based, bi-functional electrocatalysts for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) have attracted increased attention for use in electrochemical energy conversion systems, owing to their low cost and high activity. In this work, N-doped carbon nanocages (N-CCs) with a porous self-supported architecture and high specific surface area are synthesized by a facile interfacial assembly synthetic route. The materials are comprehensively characterized by scanning electron microscopy, transmission electron microscopy, nitrogen adsorption–desorption experiments, X-ray diffraction, and X-ray photoelectron spectroscopy. Cyclic voltammetry, chronoamperometry, and linear sweep voltammetry demonstrate that the as-prepared N-CC could serve as an effective metal-free electrocatalyst with excellent catalytic activity, long-term operation durability, and excellent methanol tolerance for the ORR in alkaline media. In the presence of 3 mM methanol, the half wave potential of the N-CCs for the ORR is 190 mV; this is more positive than that of the commercial Pt/C electrocatalyst. Meanwhile, the N-CCs also show an OER activity comparable to that of the commercial Ru/C electrocatalyst, revealing their bifunctional property.
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高影响因子
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