ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 23
·23763-23776
·
IF 2.914
Xiao Xi,Li Chao,Huang Haomin,Lee Ying Ping
Red tides that occur off coasts have become a worldwide phenomenon over the past decades. In order to mitigate the damage of the red tides on the aquatic ecosystems, it is crucial to develop a method for predicting algicidal activities that requires less labor and time, and most importantly, this method can quickly screen potential algicides to control red tides. In this study, we have investigated the algicidal activity of 19 natural flavonoids against a typical red tide alga, Phaeocystis globosa. Our results indicate that after 5 days of flavonoid exposure, the half inhibition concentrations (IC 50 ) ranged from 0.068 to 3.065 mg L −1 , which showed the strong algicidal activities of the flavonoids. Furthermore, quantitative structure activity relationship (QSAR) model has been carried out between negative scale logarithm (pIC 50 ) of the flavonoids and the corresponding molecular descriptors. The developed model was validated, both internally and externally, which displayed statistical robustness ( R 2 = 0.867, p = 0.0002, Q 2 LOO = 0.825, RMSEC = 0.182, Q 2 extF3 = 0.896, RMSEP = 0.161, CCC = 0.935). This indicates that the developed model was obtained successfully with satisfactory predictability and robustness for the future rapid screening of natural flavonoids with high inhibition activity on the red tide alga growth. Moreover, the main descriptors in the QSAR model were the molar refractivity, partition coefficient, lowest unoccupied molecular orbital, and highest occupied molecular orbital, illustrating that the molecular electro-chemical characteristics are significant in the algicidal actions of the flavonoids.
Red tides frequently occur worldwide and have become a global environment problem. Flavonoids showed great potential in allelopathic control of the excessive growth of red tide algae. In this study, the algicidal activity of 19 natural flavonoids was investigated on a typical red tide organism Phaeocystis globosa . Futhermore, we applied the quantitative structure-activity relationship (QSAR) model to the experimental data. The model between molecular descriptors of flavonoids and their antialgal activity displays statistical robustness, and 4 of 45 selected molecular descriptors were obtained by regression of training set. The numbers in the figure represent the half inhibition concentration (IC 50 ) of flavonoids. Our results show that the algicidal activity of flavonoids is closely related to molar refraction, partition coefficient, lowest unoccupied molecular orbital, and highest occupied molecular orbital. The QSAR model can efficaciously predict the algicidal activity and provide insights into the inhibitory mechanisms of flavonoids.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 12
·8909-8920
·
IF 2.993
Chen Jie,Liu Zengshe,Nie Xiaoan,Jiang Jianchun
A castor oil-derived diglycidyl ester plasticizer (C26-DGE) was prepared and incorporated into poly(vinyl chloride) (PVC) for the first time. The chemical structure of the product was characterized by Fourier transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance ( 1 H-NMR), and carbon-13 nuclear magnetic resonance ( 13 C-NMR). The plasticizing effects of C26-DGE as a primary or secondary plasticizer for the commercial plasticizer dioctyl phthalate (DOP) were studied. The mechanical properties, thermal stability, and migration stabilities of PVC films were investigated using dynamic mechanical analysis, thermogravimetric analysis (TGA), TGA-FTIR analysis, and PVC film surface analysis. Tensile, volatility, and extraction tests were also done. The castor oil-based plasticizer was found to endow the PVC matrix with enhanced compatibility and flexibility. With partially or completely substituted DOP, C26-DGE significantly increased the thermal stability of PVC blends. Furthermore, the volatility and extraction resistance of the novel plasticizers were generally superior to those of DOP. The interaction between the C26-DGE and PVC molecules and the thermal degradation process of PVC blends were also investigated.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 5
·3603-3612
·
IF 2.599
Wang Min,Han Xiuxun,Zhao Yun,Li Jiajia,Ju Peng,Hao Zhaomin
Nano-sized materials have attracted tremendous attentions because of their promising practical applications and theoretical values. The nano-sized materials are able to not only enhance the intrinsic properties of their bulk counterparts but also give birth to new promising properties. Herein, heterojunctions consisted of graphene oxide (GO) and three different MoS 2 nanostructures, including nanoflowers, nanoparticles, and quantum dots, were constructed and used as photocatalysts in water splitting. The electrochemical behavior and photocatalytic performance of MoS 2 /GO composites were found closely related to the particle size and morphology of MoS 2 . Compared to bulk MoS 2 /GO photocatalyst, nano-sized MoS 2 /GO heterostructures exhibited obviously enhanced performance in photocatalytic hydrogen generation. Benefitting from the surface effect and the quantum confinement in MoS 2 quantum dots, MoS 2 quantum dots/GO displayed the highest photocatalytic activities. This study indicates that the decrease in the dimension of MoS 2 can effectively increase the photocatalytic hydrogen evolution performance of MoS 2 /GO heterostructures, and thus suggests preferred strategy to design other HER photocatalysts based on MoS 2 .
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高影响因子
SN Applied Sciences
·
2022
·Vol. 5
·期 1
·1-14
·
IF 0
Yu Changye,Lu Xian,Lu Jinyu,Zhang Yinjiang
In this study, zero-valent iron (ZVI) is applied to activate persulfate (PDS) for the degradation of amaranth (AMR). The effects of PDS concentration, ZVI concentration, solution pH , temperature, and reaction time on the degradation of AMR by the ZVI/PDS advance oxidation process are investigated. Sulfate and hydroxyl radicals are involved in the main reaction pathway of AMR and sulfate radical acts as a dominant oxidant. The CCD (central composite design) plan is chosen to build the RSM model for the prediction of AMR degradation. ANOVA analysis shows that the secondary fitting model had great fitness with R 2 = 0.997, \(R_{{{\text{adj}}}}^{2}\) = 0.936, p -value of lack of fit = 0.107. Optimum conditions for 98% AMR removal given by RSM are PDS concentration = 7.33 mM, ZVI dosage = 17.79 mM, initial pH 4.62, temperature = 59.49 °C, reaction time = 9.88 min which is proved to be very closed to the real removal rate of 96.78%. Sensitivity analysis indicates that the relative importance of the influencing parameters is of the following order: temperature, PDS concentration, pH , ZVI dosage, and reaction time. The PDS/ZVI system shows an acceptable RSE of about 75% and TOC removal of 85% on AMR oxidation. Finally, the possible pathway of AMR degradation is proposed.
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JOURNAL OF MATERIALS SCIENCE
·
2015
·Vol. 51
·期 4
·2160-2167
·
IF 2.371
Wei Feifei,Cao Hongliang,Chen Xin
La 0.6 Sr 0.4 CoO 3− δ
(LSC)–Ce 0.8 Gd 0.2 O 2− δ
(GDC) nanocomposite materials were prepared by a modified sol–gel method to improve solid oxide fuel cell cathode performance in intermediate temperature. Metal acetates precursors and citric acid combined with ethylene glycol as complex agents were used in the sol–gel process. Nano foam-like GDC powders were introduced into the sol–gel process to get the nanocomposites with the GDC content in the range of 10–50 wt%. In addition, pure LSC nano powders were also synthesized for comparison. The crystalline phases, morphologies, and elemental distributions of the pure LSC and LSC–GDC composite powders were characterized, and their electrode performances were investigated with electrochemical impedance spectroscopy. The results showed the GDC particles were largely covered by LSC, and the optimal GDC content was 30 wt% for the LSC–GDC electrode performance in this study.
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高影响因子
IONICS
·
2023
·Vol. 30
·期 2
·697-708
·
IF 2.8
Wang Guanzheng,Lei Huazhi,Wang Zheng,Yuan Zhentao,Zhan Zhaolin,Li Lu,Wang Xiao
Amorphous GeO 2 @C anode materials were successfully prepared from commercial GeO 2 and C 6 H 12 O 6 .H 2 O by a hydrothermal method combined with sintering under nitrogen atmosphere protection. The anode materials showed an ideal spherical shape of about 3 μm and their surface was uniformly covered with C. GeO 2 @C composite anodes exhibited better storage performance for Li-ion batteries. The discharge-specific capacities of GeO 2 @C-3 sample were 1143, 1049, 776, 551, and 308 mAh g -1 at current densities of 0.2, 0.5, 1, 2, and 5 A g -1 , and restored to 1136 mAh g -1 when the current density returned to 0.2 A g -1 . The reversible specific capacity was 756 mAhg -1 after 1000 cycles at a current density of 1 A g -1 . The GeO 2 @C anode was stable in the process of charge and discharge, and no obvious pulverization occurred. GeO 2 @C composites stabilized the electrochemical properties through carbon and amorphous structure to improve the overall electrical conductivity in Li + embedding/de-embedding processes.
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 10
·1-8
·
IF 2.8
Zhou Ben,Cao Yu-Ting,Lu Shuai-Wei,Wei Jun
The epoxy intermediates with three hydroxyl groups were synthesized from 2-aminoethanol (ETA) with ethylene glycol diglycidyl ether (EGDE) or resorcinol diglycidyl ether (RDGE), followed by the neutralization of the inherent tertiary amine groups. The intermediate was then reacted with isophorone diisocyanate (IPDI) to produce polyurethane prepolymer, which was further chain-extended and modified by polyethylene glycol (PEG-1000) and polyethylene glycol monomethyl ether (MPEG-1200), respectively. Finally, methyl ethyl ketone oxime (MEKO) was used to block the residual isocyanate (NCO) group, leading to the achievement of the waterborne polymeric crosslinkers containing blocked NCO moieties and active epoxy groups. The structure of the crosslinkers was characterized by Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance hydrogen spectroscopy ( 1 H-NMR). TG and DTG profiles show that both crosslinkers can quickly crosslink and cure the resin at temperatures above 96 °C. The mechanical properties of the cured films obtained by applying crosslinkers to electrophoretic coatings were also studied. The results show that the coating prepared by the crosslinker of the RDGE system has the best adhesion and can reach a maximum of 0.66 MPa.
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高影响因子
Nano Research
·
2023
·Vol. 16
·期 12
·13366-13374
·
IF 9.9
Lin Chaoxin,Kim Kumchol,Wang Zuochao,Yan Zhuang,Tang Zhiyong,Liu Yaling
Integration and synergy of the unique functions of different components have been developed into one of the most convenient and effective ways to construct the composite advanced materials with collective properties and improved performances. In this work, the mace-like tetrathiafulvalene-tetracyanoquinodimethane (TTF-TCNQ)/HKUST-1 composite structures with single single-crystalline TTF-TCNQ submicrorods covered by ordered HKUST-1 nanosheet arrays were successfully constructed by an efficient TTF-TCNQ seed-mediated growth approach. Impressively, thanks to the synergetic and complementary effects between TTF-TCNQ and HKUST-1, the sensors based on such mace-like TTF-TCNQ/HKUST-1 composite structures not only displayed an experimental detection limit of 10 part per billion (ppb) for NO 2 detection, but also exhibited outstanding selectivity even if the concentration of the interfering gases was 10 times that of NO 2 . Meanwhile, good reproducibility and rapid response were also achieved. This work opens the avenue for creation of novel high-performance sensing materials for application in gas sensing.
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高影响因子
Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-5
·
IF 3.125
Hua Qiqi,Dai Dongyang,Zhang Chengzhi,Han Fei,Lv Tiezheng,Li Xiaoshan,Wang Shijie,Zhu Rui,Liao Haojie,Zhang Shiguo
Although several Si/C composite structures have been proposed for high-performance lithium-ion batteries (LIBs), they have still suffered from expensive and complex processes of nano-Si production. Herein, a simple, controllable oxygen inward diffusion was utilized to transform Si sludge obtained from the photovoltaic (PV) industry into the nano-Si/SiO x structure as a result of the high diffusion efficiency of O inside Si and high surface area of the sludge. After further process, a yolk/shell Si/C structure was obtained as an anode material for LIBs. This composite demonstrated an excellent cycling stability, with a high reversible capacity (∼ 1250 mAh/g for 500 cycles), by void space originally left by the SiO x accommodate inner Si expansion. We believe this is a rather simple way to convert the waste Si into a valuable nano-Si for LIB applications.
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高影响因子
Nanoscale Research Letters
·
2012
·Vol. 7
·期 1
·1-7
·
IF 2.726
Li Wei,Xu Yaohui,Zhou Yang,Ma Wenhui,Wang Shixing,Dai Yongnian
Silica nanoparticles have been functionalized by click chemistry and atom transfer radical polymerization (ATRP) simultaneously. First, the silanized silica nanoparticles were modified with bromine end group, and then the azide group was grafted onto the surface via covalent coupling. 3-Bromopropyl propiolate was synthesized, and then the synthesized materials were used to react with azide-modified silica nanoparticles via copper-mediated click chemistry and bromine surface-initiated ATRP. Transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis were performed to characterize the functionalized silica nanoparticles. We investigated the enrichment efficiency of bare silica and poly(ethylene glycol) methacrylate (PEGMA)-functionalized silica nanoparticles in Pb(II) aqueous solution. The results demonstrated that PEGMA-functionalized silica nanoparticles can enrich Pb(II) more quickly than pristine silica nanoparticles within 1 h.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 6
·5536-5543
·
IF 2.195
Yu Zhihao,Gao Tianji,Le TrungHieu,Wang Wenxuan,Wang Li,Yang Ying
This study reports a supramolecular self-healing material as a multi-functional binder for lithium–sulfur batteries. The spontaneously damage repair ability of such a binder can be applied to overcome the short cycle-life issue of lithium–sulfur batteries under low current density with deep galvanostatic cycling. Diamines and polybasic acids are used to synthesize the supramolecular self-healing material. 10 wt% amine groups in this designed material provide a large amount of chemical adsorption sites for polysulfides which can effectively inhibit the shuttling of polysulfides and maintain the content of sulfur species in cathode. This N-rich binder is mixed with the sulfur during preparation, which can improve the effective contacting surface of N function groups and sulfur locally. The cells with pure self-healing material binder achieve an initial capacity of 918 mAh g −1 , and maintain a reversible capacity of 469 mAh g −1 after 200 cycles at 0.1C, twice higher than the retention capacity of cells with polyvinylidene fluoride binder. After optimization, the cells with a hybrid binder of self-healing material and polyvinylidene fluoride (weight ratio of 1:1) with a sulfur loading of 2.65 mg cm −2 achieve an initial capacity of 993 mAh g −1 , and remain a reversible capacity of 571 mAh g −1 with a capacity fade of 0.2% per cycle after 200 cycles at 0.1C.
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高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 6
·1641-1650
·
IF 3.146
Ling Yang,Wu Jiang,Yang Lingtao,Liu Dongjing
The emission of mercury from anthropogenic activities is a serious concern in both developed and developing countries due to its high toxicity and persistence. Here, carbon nitride nanosheets (CNNS) were attained via a two-step thermal etching method and applied for Hg 0 removal. Proper deposition of ZnS can markedly reinforce the Hg 0 capture ability of CNNS. 10ZnS/CNNS notably outperforms ZnS and CNNS at 100 °C, which is primarily attributed to surface chemisorbed oxygen species and polysulfide active sites. Besides, Hg 0 adsorption and thermal catalytic oxidation pathways are further disclosed using quantum chemistry calculations based on density functional theory (DFT). The calculation results show that the presence of zinc species is beneficial to the decomposition of adsorbed oxygen, which plays a key role in the catalytic oxidation of Hg 0 , thereby contributing to the enhancement of mercury removal performance.
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高影响因子
危险品化学品经营许可证（带存储）