INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Zhihao Zhang,Zhongying Ma,Qian Leng,Yuhua Wang
With the increasing awareness of environmental protection, the greening of flame retardants has become an inevitable choice for flame retardant technology. Bio-based materials have the advantages of wide source, recyclability and green environmental protection, and have received extensive attention. In this work, chitosan and phytic acid as intumescent flame retardant system and metal ion as a synergist were built on cotton fabrics to achieve efficient flame retardancy by facile dip-pad-dry process. Microscale combustion calorimetry results manifested that the heat release rate values of coated samples were lower than that of uncoated samples. The peak heat release rate and total heat release of uncoated samples were 333.1 W/g and 13.1 kJ/g, while these values of samples coated CH/PA/Ba/PA were 129.1 W/g and 5.4 kJ/g respectively and char residues also were increased sharply owing to the phosphate groups promote the formation of char layer covering the surface of the cotton fabrics, which can prevent heat transfer. Scanning electron microscopy confirmed that there were much more bubbles on the surface of fibers for the coated CH/PA/Ba/PA after horizontal flame tests. The results indicated that the synergy of the intumescent flame retardant system was achieved by the addition of metal ions which could accelerate the produce of a large number of nonflammable gases. Horizontal flame test and limit oxygen index (LOI) test showed that the burning rate and LOI values of samples coated CH/PA/Ba/PA, CH/PA /CH/PA, PA/Ba/PA/Ba were 1.5 mm/s and 22.0, 2.0 mm/s and 20.2 and 2.5 mm/s and 18.0 respectively, compared to 3.3 mm/s and 16.2 of uncoated samples. The samples with intumescent flame retardant system and metal ions (CH/PA/Ba/PA) had best flame retardant performance. Moreover its weight gain (5.2%) was less than that (10.7%) of the sample only with intumescent flame retardant system (CH/PA /CH/PA). The less weight gain had less effect on the softness of cotton fabrics. As a result, the coating is expected to be applied in practice.
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高影响因子
RSC Advances
·
2019
·Vol. 9
·期 44
·25932-25941
·
IF 3.049
Ailing Feng,Mingliang Ma,Zirui Jia,Meng Zhang,Guanglei Wu
In this work, a novel CF@NiFe2O4 composite coated with phytic acid-doped polyaniline (CF@NiFe2O4@p-PANI) was facilely synthesized. First, a typical solvothermal reaction was applied to obtain the CF@NiFe2O4 composite, and then the phytic acid-doped polyaniline was grown in situ on the surface of the CF@NiFe2O4 composite. The morphological structure, chemical composition, and surface functional group distribution of this hybrid were systematically evaluated. The magnetic saturation (Ms) value of the hybrid is 29.9 emu g−1, which represents an improvement in the magnetic loss. According to its reflection loss curve, the hybrid exhibits a superior EM wave absorption capacity, with a minimum reflection loss value and effective absorbing bandwidth of −46 dB when the sample thickness is 2.9 mm, and an effective absorption bandwidth of 5 GHz when the sample thickness is 1.5 mm. The excellent performance of this hybrid can mainly be attributed to its ideal matching of magnetic loss and dielectric loss, interfacial polarizations, eddy current loss and interface relaxation. This new material has the potential to be a superior electromagnetic wave absorber or applied as a functional filler to modify resin matrices.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2019
·Vol. 25
·期 33
·7826-7830
·
IF 5.16
Tingting Liu,Jianmei Wang,Changyin Zhong,Shiyu Lu,Wenrong Yang,Jian Liu,Weihua Hu,Chang Ming Li
Graphical A fair comparison : A strategy to grow nanoparticles of three Ru phosphides on graphene sheets was developed. The resulting three electrocatalysts for the hydrogen evolution reaction (HER; see figure) show similar morphology, loading density, nanoparticle size, Ru content, and electrochemical surface area, which allows a fair comparison of the effect of the phosphide phase on HER activity. Ru 2 P/graphene shows the best HER performance and highest intrinsic activity in acid solution, and all three electrocatalysts show excellent long-term HER durability. The outstanding electrocatalytic activity of ruthenium (Ru) phosphides toward the hydrogen evolution reaction (HER) has received wide attention. However, the effect of the Ru phosphide phase on the HER performance remains unclear. Herein, a two-step method was developed to synthesize nanoparticles of three types of Ru phosphides, namely, Ru 2 P, RuP, and RuP 2 , with similar morphology, dimensions, loading density, and electrochemical surface area on graphene nanosheets by simply controlling the dosage of phytic acid as P source. Electrochemical tests revealed that Ru 2 P/graphene shows the highest intrinsic HER activity, followed by RuP/graphene and RuP 2 /graphene. Ru 2 P/graphene affords a current density of 10 mA cm −2 at an overpotential of 18 mV in acid media. Theoretical calculations further showed that P-deficient Ru 2 P has a lower free energy of hydrogen adsorption on the surface than other two, P-rich Ru phosphides (RuP, RuP 2 ), which confirms the excellent intrinsic HER activity of Ru 2 P and is consistent with experiment results. The work reveals for the first time a clear trend of HER activity among three Ru phosphide phases.
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International Journal of Polymer Science
·
2019
·
IF 1.892
Mingbo Ma,Pirah Ayaz,Wanhui Jin,Wenlong Zhou
The color of naturally colored silk (NCS) fades easily during home washing due to the loss of pigment accompanied by dissolution of the sericin. In this study, phytic acid was used to cross-link the sericin of NCS and reduce its solubility, aiming at improving the color fastness of NCS to repeated washing. It was found that the sericin-fixing effect increased as the concentration of phytic acid to 1.0 wt% and the cross-linking time to 5 h increased and then reached a constant level. Cross-linking at pH 7.0-8.5 and temperature 30-40°C could obtain relatively good sericin-fixing effects. The cross-linked NCS showed low sericin loss during the degumming and had much better color fastness to repeated washing as compared with the samples before cross-linking. The cross-linking method proposed in this study may be not only a kind of solution for improving the color fastness of NCS with high practicality but also an alternative for cross-linking sericin-based materials in the biomedical field.
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MICROCHIMICA ACTA
·
2019
·Vol. 187
·期 1
·1-9
·
IF 5.479
Zhang Wanqing,Fan Shumin,Li Xinli,Liu Shanqin,Duan Dawei,Leng Leipeng,Cui Chengxing,Zhang Yuping,Qu Lingbo
A glassy carbon electrode (GCE) was modified with a composite prepared from phytic acid, polypyrrole and a ZIF type metal-organic framework (PA/PPy)/ZIF-8@ZIF-67). The nanocomposite was prepared by in-situ chemical polymerization in the presence of ferric chloride and subsequently functionalized with PA to form PA/PPy/ZIF-8@ZIF-67. The materials were characterized by XRD, FT-IR, BET, XPS, SEM and TEM. The modified GCE was applied to individual and simultaneous detection of Pb(II) and Cu(II), with peak voltages of −0.6 and − 0.1 V, respectively (vs. SCE). The amount of PPy, the ZIF-8@ZIF-67 concentration, polymerization potential, polymerization time and pH value were optimized. Under optimized conditions, the calibration plots have two linear ranges. These are from 0.02 to 200 μM and from 200 to 600 μM for Pb(II), and from 0.2 to 200 μM and 200 to 600 μM for Cu(II). The detection limits are 2.9 nM and 14.8 nM, respectively. Simultaneous detection of Pb(II) and Cu(II) is also demonstrated. The good performance of the electrode is attributed to the large surface area of ZIF-8@ZIF-67, the good electrical conductivity of PPy, and the metal complexation power of PA. The modified GCE was successfully applied to the determination of Pb(II) and Cu(II) in real samples and gave satisfactory recoveries.
Schematic presentation of the construction process of PA/PPy/ZIF-8@ZIF-67/GCE sensor, and the mechanism of Pb(II) and Cu(II) at the prepared sensor.
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MICROCHIMICA ACTA
·
2019
·Vol. 187
·期 1
·1-8
·
IF 5.479
Yang Lili,Wang Hao,Lü Haitao,Hui Ni
A nanocomposite consisting of phytic acid (PA) that was doped with poly(3,4-ethylenedioxy-thiophene) (PEDOT) and modified with copper nanoparticles (CuNPs) was placed on a glassy carbon electrode and then applied in an enzymeless glucose sensor. The undulating PEDOT/PA composite has good conductivity and a large surface area, which was suitable as substrate for the uniform growth of CuNPs. The modified electrode typically operated at a potential near 0.55 V (vs. Ag/AgCl) demonstrated remarkable catalytic activity towards direct oxidation of glucose in NaOH solution (the major limitation of this sensor). Figures of merit include (a) a wide analytical range (5 to 403 μM); (b) high sensitivity (79.27 μA·μM −1 ·cm −2 ), (c) a low detection limit (0.28 μM at a signal to noise ratio of 3), and (d) fast response (< 4 s).
A nanocomposite of phytic acid (PA) doped poly(3,4-ethylenedioxy-thiophene) (PEDOT) modified with copper nanoparticles (CuNPs) onto a glassy carbon electrode was prepared by electrochemical strategy. The CuNPs/PEDOT/PA-modified electrodes were applied in enzymeless glucose sensors with high performance.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Nian Cao,Faqiong Zhao,Baizhao Zeng
In this work, a novel self-enhanced solid state electrochemiluminescence (ECL) platform, based on polyethyleneimine (PEI) capped CdS quantum dots (PEI-CdS QDs) as coreactant and [email protected] 2 @Ru(bpy) 3 2+ doped silica ( [email protected] 2 @RuDS) nanocomposite as ECL emitter, was constructed. The PEI-CdS QDs integrated double coreactant of PEI and CdS QDs, thus significantly promoted the ECL of [email protected] 2 @RuDS. Polyaniline hydrogel was introduced to boost the electron transfer and to improve the immobilization of PEI-CdS/ [email protected] 2 @RuDS. In addition, creatinine imprinted poly(o-aminophenol) film was electrodeposited on the PEI-CdS/ [email protected] 2 @RuDS surface as recognition element. Thus, the obtained sensor possessed high sensitivity, stability, reproducibility and selectivity for creatinine sensing. The change of ECL intensity and logarithm of creatinine concentration showed a good linear relationship in the range of 0.05 nM to 5 μM, and the detection limit was low to 0.02 nM. The sensor was applied to detect creatinine in human serum and urine samples, and the results were in good agreement with those of commercial enzyme-linked immunosorbent assay kit.
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PROGRESS IN ORGANIC COATINGS
·
2020
·
IF 4.469
Congxue Yao,Weiyi Xing,Chao Ma,Lei Song,Yuan Hu,Zeyuan Zhuang
In this work, a novel phosphorous containing UV-curable monomer (PA) was synthesized by the reaction of phytic acid and glycidyl methacrylate. The structure of PA was confirmed by 13 C NMR, 1 H NMR, 31 P NMR and FTIR. Pyrolysis gas phase products of PA cured coating mainly include CO, CO 2 , H 2 O, alkyl-containing compounds, carbonyl-containing compounds and aromatic compounds. Cooperated with other two kind of reactive monomers, TAEP and TGICA, PA showed excellent fire protection effect for PMMA matrix, extending fireproof time of PMMA for more than twenty minutes. The SEM results of the carbon residues show that a certain coating prepared can form a uniform and complete expanded carbon layer, resulting in protecting the PMMA matrix from being ignited.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Weihua Meng,Pan Li,Yanrong Lan,Xiaomeng Shi,Shan Peng,Hongqiang Qu,Jianzhong Xu
Taking advantages of strong chelation capability, fire-resistance, and highly hydrophilicity of phytic acid (PA), we designed and further fabricated PA-Sn@Mg(OH) 2 (PA-Sn@MH) compounds to improve fire-resistance of MH. Multifunctional coatings consisted of PA-Sn@MH, TiO 2 and waterborne polyurethane (PU) were proved to show instant superhydrophilicity when coated onto various substrates, which also showed superior underwater superoleophobicity under diverse conditions, repeated photocatalysis capability, and fire-resistance. The coated stainless steel (SS) mesh presented excellent and stable superoleophobicity under water and other corrosive/harsh conditions. Therefore, the coated mesh could successfully and quickly separate a series of oil-water mixtures. It owned superior stability that also could separate oil-corrosive liquids (include HCl, NaOH solutions, and even strong corrosive liquid of aqua regia)/NaCl/very hot water mixtures. The intrusion pressure that the surface maximally supported was around 2.3 kPa, and the water flux was as high as 62 L m −2 s −1 . Moreover, the coatings could effectively and recycled photodegrade diverse oil and organic dyes, while still maintained its instant superhydrophilicity and superior underwater superoleophobicity, which successfully solved the easy oil-fouling problem of the superhydrophilic surfaces. When the coatings were deposited onto some inflammable substrates such as fabric, sponge, and paper, the coatings could endow them self-quenched flame-resistance. This paper reported an environmentally friendly, low-cost method to fabricate multifunctional coatings that showed very promising application potentials in oil-water separation, photocatalysis, and flame-retardant fields.
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ACS Applied Energy Materials
·
2018
·
IF 0
Tingting Liu,Bomin Feng,Xiuju Wu,Yanli Niu,Weihua Hu,Chang Ming Li
It is desirable yet challenging to develop highly active and durable hydrogen evolution reaction (HER) electrocatalysts with Pt-comparable activity for future energy devices. In this work, we report Ru2P nanoparticle decorated P/N dual-doped carbon nanofibers on carbon cloth (Ru2P@PNC/CC-900) as a highly efficient and durable hierarchical HER electrocatalyst in both acidic and alkaline media. Electrochemical tests show that this Ru2P@PNC/CC-900 possesses Pt-comparable HER activity to support 10 mA cm–2 HER current density at low overpotential of 15 and 50 mV in acidic and alkaline condition, respectively. Density functional theory calculations reveal that coupling Ru2P nanoparticles with heteroatom-doped carbon fibers leads to enhanced intrinsic HER activity. The integrative hierarchical architecture further endows high surface areas with good mechanical robustness to support abundant catalytically active sites and possesses excellent electrical conductivity and efficient access for mass transportation to facilitate the HER process.
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JOURNAL OF CATALYSIS
·
2018
·
IF 6.759
Qifan Wu,Bin Zhang,Chao Zhang,Xiangchun Meng,Xinluona Su,Shan Jiang,Ruhui Shi,Yan Li,Weiwei Lin,Masahiko Arai,Haiyang Cheng,Fengyu Zhao
The selectivity of 3-nitrostyrene (NS) hydrogenation over 0.5 wt-% Pt catalysts supported on carbon materials can be switched simply by changing reduction temperature. When the reduction temperature was 150 °C, 1-ethyl-3-nitrobenzene (ENB) was mainly produced in a selectivity of 93% at a conversion of 95% (at 100 °C). When the reduction was conducted at a higher temperature of 450 °C, in contrast, the main product was switched to 3-aminostyrene (AS) in a selectivity of 96% at a conversion of 91%. That is, the Pt/C catalysts reduced at low and high temperatures could preferentially catalyze the hydrogenation of vinyl and nitro groups of NS, respectively. This switching of the product selectivity may be ascribed to actions of surface oxygen-containing functional groups and surface hetero P species. The quantity and nature of these surface species were examined in detail by a few different methods. For the low-temperature reduced catalyst, surface acidic groups present close to Pt nanoparticles (∼2 nm) would interact with the nitro group of a NS molecule and make its vinyl group more likely to interact with the surface active metal species of Pt nanoparticles; this facilitates the hydrogenation of the latter and produces ENB selectively. For the high-temperature reduced catalyst, however, P species would interact with Pt and form Pt-PO x complex, on which a NS molecule is likely to be adsorbed with its nitro group, facilitating the selective production of AS via its hydrogenation. It is demonstrated that surface functional groups and surface hetero atoms (like P), in addition to main active metal species (like Pt), should have direct actions in the catalysis for such a catalyst that exposes a larger quantity of surface functional groups and/or hetero atoms compared to the number of supported metal nanoparticles .
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2018
·Vol. 317
·期 2
·701-714
·
IF 1.181
Zhang W.,Tan N.,Hou D.,Lin Y. W.,Yan X. M.,Gao Y.,He D. X.,Jiang M.,Wang J.
Uranyl ion-imprinted polymers (U(VI)-IIPs) were successfully prepared by combining phytic acid as the functional monomer, uranyl ion (UO 2 2+ ) as the template, and tetraethyl silicate (TEOS) as the cross-linker with the marine facultative fungus Fusarium sp. #ZZF51 addicted to U (VI) mycelium through the ion-imprinted sol–gel method. Single-factor experiments were performed to optimize the preparation conditions and the prepared materials were better characterized with FTIR, SEM and BET meter. The optimum adsorption conditions were explored by single-factor experiments and BBD response surface method in detail. The adsorption–desorption recycling and adsorption selectivity experiments revealed that U(VI)-IIPs had a good stability and selectivity. The U (VI) adsorption process of U(VI)-IIPs was better described by the pseudo-second order kinetic equation and Langmuir isotherm model.
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