CHEMOSPHERE
·
2020
·
IF 5.778
Huan Jiang,Chenyuan Dang,Wen Liu,Ting Wang
Degradation of phenols with different substituent groups (including –OCH 3 , –CHO, –NHCOCH 3 , –NO 2 , and −Cl) at boron-doped diamond (BDD) anodes has been studied previously based on the removal efficiency and •OH detection. Innovatively, formations of CO 2 gas and various inorganic ions were examined to probe the mineralization process combined with quantitative structure-activity relationship (QSAR) analysis. As results, all phenols were efficiently degraded within 8 h with high COD removal efficiency. Three primary intermediates (hydroquinone, 1,4-benzoquinone and catechol) were identified during electrochemical oxidation and degradation pathway was proposed. More importantly, CO 2 transformation efficiency ranked as: no N or Cl contained phenols ( p -CHO, p -OCH 3 and Ph) > N-contained phenols ( p -NHCOCH 3 and p -NO 2 ) > Cl-contained phenols ( p -Cl and o,p -Cl). Carbon mass balance study suggested formation of inorganic carbon (H 2 CO 3 , CO 3 2− and HCO 3 − ) and CO 2 after organic carbon elimination. Inorganic nitrogen species (NH 4 + , NO 3 − and NO 2 − ) and chlorine species (Cl − , ClO 3 − and ClO 4 − ) were also formed after N- and Cl-contained phenols mineralization, while no volatile nitrogen species were detected. The phenols with electron-withdrawing substituents were easier to be oxidized than those with electron-donating substituents. QSAR analysis indicated that the reaction rate constant ( k 1 ) for phenols degradation was highly related to Hammett constant (∑ σ o , m , p ) and energy gap ( E LUMO - E HOMO ) of the compound ( R 2 = 0.908), which were key parameters on evaluating the effect of structural moieties on electronic character and the chemical stability upon radical attack for a specific compound. This study presents clear evidence on mineralization mechanisms of phenols degradation at BDD anodes.
✓ 已验证
DOI
PubMed
高影响因子
Polymers
·
2021
·Vol. 13
·期 14
·2324
·
IF 4.329
Liusi Wang,Haoliang Li,Shuxing Xiao,Mohan Zhu,Junhe Yang
With the development of integrated devices, the local hot spot has become a critical problem to guarantee the working efficiency and the stability. In this work, we proposed an innovative approach to deliver graphene foam/polyaniline@epoxy composites (GF/PANI@EP) with improvement in the thermal and mechanical property performance. The graphene foam was firstly modified by the grafting strategy of p-phenylenediamine to anchor reactive sites for further in-situ polymerization of PANI resulting in a conductive network. The thermal conductivity (κ) and electromagnetic interference shielding (EMI) performance of the optimized GF/PANI4:1@EP is significantly enhanced by 238% and 1184%, respectively, compared to that of pristine EP with superior reduced modulus and hardness. Such a method to deliver GF composites can not only solve the agglomeration problem in traditional high content filler casting process, but also provides an effective way to build up conductive network with low density for thermal management of electronic devices.Keywords:graphene foam;in-situ polymerization;conductive network;thermal management;EMI shielding
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Yan Zhang,Huimin Ruan,Changmeng Guo,Junbin Liao,Jiangnan Shen,Congjie Gao
Innovative approaches to restraint bacterial adhesion and growth on membranes are significantly needed to avoid membrane performance decaying for biofouling. In this work, a series of thin film nanocomposite (TFN) reverse osmosis (RO) membranes has been prepared by incorporating nano-fillers of p -aminophenol-modified graphene oxide (mGO) into the polyamide skin layer via interfacial polymerization. Our investigations demonstrate that the introduction of mGO nano-fillers into the functional skin layers reduces the hydrophilicities with the water contact angles drop from 69.6° to 48.2° and meanwhile decreases the thickness of functional skin layers from 240 nm to 50 nm, relative to pristine polyamide RO membrane without nano-fillers. As a result, the as-prepared TFN RO membrane at optimized conditions shows a water flux of 23.6 L·m −2 ·h −1 and a NaCl rejection rate of 99.7%, reflecting a remarkable promotion in water flux (by 24.5%) compared with the pristine RO membrane. In addition, the data statistics of the live/dead fluorescent imaging assay demonstrate that TFN RO membrane with mGO exhibits bacterial killing ratios of 96.78% and 95.26% against E. coli and S. aureus at the additive loading of 0.005 wt%, which are much higher than RO membrane with GO (90.64%; 90.43%) and pristine RO membrane (4.95%; 2.48%). This work demonstrates a facile way to TFN RO membranes with good separation performance and desirable antibacterial capacities.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 72
·42335-42342
·
IF 3.049
Bo Huang,Xinxin Luo,Qichao Zou,Suxiao Wang,Jinzhi Zhang
We reported an innovative transparent, elastic and flexible conductive composite materials P(SSNa-BA-St)/PEDOT/graphene which were prepared by using P(SSNa-BA-St) latex as template for PEDOT polymerization and graphene doping. This P(SSNa-BA-St)/PEDOT/graphene film exhibited highly transparent, good water resistance, low moisture adsorption, highly elastic and highly conductive properties, which can serve as a practical approach to fabricate the flexible, conductive and transparent films for wearable and implantable electronic devices, and photovoltaic cells.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ORGANOMETALLIC CHEMISTRY
·
2019
·
IF 2.066
Amin Khan,Haojie Yu,Yang Wang,Li Wang,Raja Summe Ullah,Fazal Haq,Tarig Elshaarani,Muhammad Usman,Ahsan Nazir,Kaleem-ur-Rehman Naveed
Different copolymers (poly(2-(methacryloyloxy) ethyl ferrocene carboxylate- co -methacrylo-4-aminoazobenzene- co -methacrylic acid)s) (P(FHEMA- co -MAZO- co -MAA)s) were synthesized and their different properties were analyzed in this work. Methacrylic acid was introduced as a side group to possibly affect the photostability. The synthesized copolymers were characterized by nuclear magnetic resonance ( 1 H NMR) spectroscopy and gel permeation chromatography (GPC). Thermal studies were performed by thermogravimetric (TG), differential thermogravimetric (DTG) and differential scanning calorimetry (DSC) analysis, which showed that the copolymers were thermally stable under the operating conditions of the information storage devices. Redox studies and photoresponsive studies were performed by CV technique and UV/vis spectroscopy which showed that these copolymers contained good redox and photoresponsive properties. The obtained results paved the way towards the four states information storage of the materials.
✓ 已验证
产品关联
DOI
高影响因子
WATER ENVIRONMENT RESEARCH
·
2019
·Vol. 92
·期 5
·713-721
·
IF 1.24
Yunhai Zhang,Shuangxi Zhou,Xin Su,Jimin Xu,Guangze Nie,Yongjun Zhang,Yide He,Shuili Yu
A p-type TiO 2 with Ti vacancies (D-TiO 2 ) was synthesized by a facile solvothermal treatment, and Ag/TiO 2 with different Ag loading amount was prepared through a photo-reduction deposition method. The samples were characterized through scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The adsorption and photocatalytic characteristics of tetrabromobisphenol A (TBBPA) on D-TiO 2 and Ag/TiO 2 were investigated. The adsorption of TBBPA on Ag/TiO 2 was significantly enhanced and was five times greater than that of pure TiO 2 . The increase in pH significantly inhibited the adsorption of TBBPA. The 2%-Ag/TiO 2 nearly completely degraded TBBPA in 10 min under UV–Vis light (λ > 360 nm), and the apparent reaction rate constant ( k app ) reached 0.63 min −1 . The significantly enhanced UV–Vis light catalytic properties of the Ag/TiO 2 in comparison with that of TiO 2 were attributed to the increased adsorption capacity and electron transfer ability of the Ag/TiO 2 . Free radical trap experiments results showed that holes and superoxide radicals play a major role in the catalytic degradation of TBBPA by Ag/TiO 2 . Moreover, the Ag/TiO 2 catalyst exhibits high stability during TBBPA degradation even after three cycles. Practitioner points Ti-defected TiO 2 and Ag/TiO 2 were synthesized using a solvothermal and photo-reduction deposition, respectively. Ag/TiO 2 exhibited outstanding adsorption and photocatalytic activity for TBBPA removal under UV–Vis light. Holes and superoxide radicals play a major role in the photocatalytic degradation of TBBPA.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 12
·4815-4822
·
IF 3.069
Jin Wang,Mengde Deng,Yahui Xiao,Wentao Hao,Chengfeng Zhu
Polyelectrolytes with good ionic conductivity and dielectric properties have been shown to be superior for supercapacitors and other power storage devices. Here, a cationic polyelectrolyte with blended poly(N-vinylpyrrolidone-co-diallyl dimethyl ammonium chloride) (P(NVP-co-DMDAAC)) copolymer and poly(vinyl alcohol) (PVA) was prepared via the interpenetrating polymer network (IPN) technique. The dielectric properties, ionic conductivity, mechanical properties and the influence of the thicknesses of hydrogel membranes on capacitance properties were studied. The introduction of the cationic DMDAAC monomer and polar PVA increased the integrated performance of the PNVP hydrogel. In comparison with PVA, PNVP, and P(NVP-co-DMDAAC), P(NVP-co-DMDAAC)/PVA IPN hydrogel exhibited higher permittivity of 27.19 at 1 kHz frequency and the maximum ionic conductivity of 3.66 × 10−2 S cm−1 at 10% PVA dosage. The tensile strength increased with the increase in the PVA content. The specific capacitances of P(NVP-co-DMDAAC)/10PVA increased with the decrease in the thickness of the hydrogel membrane and its retention rate was 95% after 1000 cycles.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Jianshuo Zhang,Kun Hou,Qianqian Yao,Chuxin Wu,Meihua Huang,Lunhui Guan
Transition metal phosphides represent a class of promising electrocatalysts for electrochemical water oxidization and other energy conversion reactions. In this work, we report a novel seal strategy, followed by a second step phosphorization treatment, produces Ni-Fe-P heterostructure directly grown on nickel foam that shows highly catalytic activity for electrochemical water oxidation . The as-prepared catalyst exhibits an excellent electrocatalytic activity , manifested by a current density of 20 mA cm −2 with a very low overpotential (260 mV) for oxygen evolution reaction along with an extremely small Tafel slope of 27 mV decade −1 and a very excellent durability of 120 h in alkaline solution. The excellent performance with exceptional durability owe much to the synergistic effect between the Ni-Fe-P heterostructure and the outer oxidized layer. Remarkably, a current density of 10 mA cm −2 was reached at a low cell voltage of 1.63 V when the original electrode and surface oxidized electrode are used as cathode and anode , respectively.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2019
·
IF 3.261
Minghuan Gao,Lisha You,Linna Guo,Tiesheng Li
Polyhedron-like WO 3 (n-type WO 3 ) nanoparticles were synthesized by a simple hydrothermal reaction without using any template or surfactant. The Polyhedron-like WO 3 /Ag 2 CO 3 p-n junction photocatalyst was first synthesized by a simple impregnation-deposition way. The obtained samples were investigated by XRD, BET, XPS, SEM, TEM etc. The separation mechanisms of photo-induced electrons (e − ) and photo-induced holes (h + ) of the Polyhedron-like WO 3 /Ag 2 CO 3 p-n junction samples were characterized by PL technique, EIS and determination of active sites and species in the photocatalytic reactions. In this p-n junction structure, Polyhedron-like WO 3 nanoparticles adhered to the surface of the Rod-like p-type Ag 2 CO 3 nanoparticles. The Polyhedron-like WO 3 /Ag 2 CO 3 p-n junction photocatalyst showed much higher photocatalytic activity than both single materials for RhB degradation under UV–vis light irradiation, and even 17 times higher than commercial powders (P25) at the same circumstance. Even compared with the related photocatalyst, it still exhibits the highest photocatalytic ability. The highly enhanced photocatalytic of the Polyhedron-like WO 3 /Ag 2 CO 3 p-n junction photocatalyst can be attributed to extended absorption, more effective separation of photogenerated charges, the transfer rate of photo-induced charge carriers and forming of p-n junction system.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Huiming Li,Yang Wang,Wei Zhu,Zhongbin Zhuang
Searching for low-cost electrocatalysts with high activity towards the hydrogen evolution reaction (HER) is of great significance to enable large-scale hydrogen production via water electrolysis . In this study, by using inverse spinel MFe 2 O 4 (M = Mn, Fe, Co, Cu) nanoparticles (NPs) as the precursors, monodisperse bimetallic phosphide M-Fe-P NPs/C with hollow structures were readily obtained by a gas-solid annealing method. These hollow phosphide NPs displayed excellent HER activity in an acidic medium with a low loading amount of 0.2 mg cm −2 . In particular, the Co–Fe–P NPs/C shows highest HER activity that only requiring an overpotential of 97 mV to retain a current density of 10 mA cm −2 . A volcano relation between activity and incorporated elements was revealed. Incorporation of cation with high electronegativity stabilized the FeP active centres, while phase segregation resulted in the loss of activity for Cu–Fe–P NPs/C.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Yinhui Yi,Lirong Liu,Wei Zeng,Baohe Lv,Gangbing Zhu
Being awfully harmful to the environment and human health, the sensitive and selective determination of p-dihydroxybenzene (p-DHB) in environmental water is of great significance. However, the similar structures and properties of p-DHB with catechol (CC; one p-DHB isomer) make the selective and reliable determination of p-DHB from CC in environmental waters being still a formidable challenge. In this manuscript, by preparing CC stabilized silicon quantum dots (C-SiQDs) via a simple hydrothermal process and using C-SiQDs simultaneously as a catalyst and fluorescence indicator, a novel nanosensing platform was successfully developed to selectively and sensitively detect p-DHB with double signals: fluorescence and colorimetric. For detecting p-DHB, C-SiQDs could catalyze the oxidation of p-DHB to form benzoquinone (BQ), an intermediate, which lead to the color change from pale yellow to dark brown and the efficient quenching the fluorescence of C-SiQDs. While for CC in samples, it could not contact C-SiQDs surface due to the great steric hindrance effect from CC on quantum dots surface, thus restricting the oxidation of CC and production of BQ, and leading that the obtained C-SiQDs have no response towards CC. Meanwhile, the developed nanosensor could also avoid various other possible interferences. Under optimized conditions, wide linear ranges (from 0.01 μM to 50.0 μM) and low detection limits (4.0 nM) were obtained for p-DHB. The simple and reliable C-SiQDs-based double signals proposal demonstrated to be potentially applicable for the highly selective and sensitive detection of trace p-DHB in various environmental water samples.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Jiaxin Lv,Xinli Chen,Susu Chen,He Li,Hong Deng
In this paper, an ultrasensitive photoelectrochemical sensor was developed for the detection of oxytetracycline , which was based on BaTiO 3 sensitized Cu 3 Mo 2 O 9 nano-composites with excellent visible-light photoelectrochemical activity. Cu 3 Mo 2 O 9 nanocrystals (NCs) with popsicle-like morphologies were synthesized through hydrothermal method and showed a very high photoelectrochemical signal. To achieve larger photocurrent density, nanostructured BaTiO 3 was then deposited on the surface of Cu 3 Mo 2 O 9 photocathodes, which led to 3-fold enhancement of the photocurrent as compared to pristine Cu 3 Mo 2 O 9 NCs. In order to obtain the specific response to oxytetracycline, oxytetracycline aptamer was fixed on the Au/BaTiO 3 /Cu 3 Mo 2 O 9 /FTO. Under visible light irradiation , the obtained aptamer/Au/BaTiO 3 /Cu 3 Mo 2 O 9 /FTO exhibited high sensitivity, good selectivity , outstanding reproducibility and low cost for detecting oxytetracycline. Furthermore, there was a linear relationship between detected signal and the oxytetracycline in the concentration range from 5 × 10 −10 to 10 −7 M, with a detection limit (3 S/N) of 4.6 × 10 −11 M under the optimal conditions. It is expected that this new photoelectric active material may have potential applications in biosensors, photocatalysis and other related fields.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）