SURFACE & COATINGS TECHNOLOGY
·
2022
·
IF 4.865
Mingliang Dong,Weijin Qian,Xingzhen Liu,Yawei Chen,Weijun Huang,Changkun Dong
N-doped Carbon nanotube (NCNT)-Pd nanocomposites were fabricated by two convenient methods to make thermo-cell (TEC) electrodes. NCNTs were first synthesized on the alloy substrate (AS) using electrophoretic deposition technique, then Pd nanoparticles were coated on the surface of NCNT by magnetron sputtering. The TEC electrodes were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Raman spectroscopy, and X-ray photoelectron spectroscopy. The TEC performances of the NCNT-Pd nanocomposite electrode were enhanced significantly compared to those of the NCNT electrode with the current density of 58.4 A·m −2 and the power density of 1.08 W·m −2 , due to better catalytic activity and more activation sites. Meanwhile, the relative conversion efficiency of 1.04% was reached. This investigation suggests that the construction of the NCNT-Pd nanocomposite electrode could effectively improve the TEC performances of NCNT electrodes, very promising for the heat energy harvesting applications.
研究领域:
材料科学
·
能源技术
·
纳米技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Di Pang,Yue Liu,Haiou Song,Duozhe Chen,Weiqing Zhu,Rumeng Liu,Hu Yang,Aimin Li,Shupeng Zhang
A trace Ti 3+ - and N-codoped TiO 2 nanotube array (TiON) anode is fabricated by electrochemical reduction after introducing nitrogen into the TiON. The TiON anode material is characterized by scanning electron microscopy, X-ray diffraction, Raman spectra and X-ray photoelectron spectroscopy. Electrochemical analyses of TiON, including cyclic voltammetry, electrochemical impedance spectroscopy and linear scan voltammetry, are conducted to confirm that the electrochemical performance could be significantly improved by electrochemical reduction and N doping. The achieved TiON anode is applied to the electrocatalytic oxidation of tetracycline (TC) and metronidazole (MNZ). The effect of applied current density, initial solution pH and initial TC/MNZ concentration on the reaction kinetics is systematically evaluated to obtain the optimal conditions. The degradation processes follow an apparent first-order kinetic model in all conditions. After 240 min of reaction time, the TC removal efficiency, chemical oxygen demand (COD) removal rate and total organic carbon (TOC) removal rate are >99%, 92.86% and 74.98%, respectively. The MNZ removal efficiency, COD and TOC removal rate achieved are >99%, 93.03% and 79.30%, respectively, after 240 min of degradation. The excellent removal efficiency of TC and MNZ indicates that this TiON anode is a promising material in the practical application of removing antibiotics from water.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Xu Tian,Lijia Yao,Xiuxiu Cui,Rongjun Zhao,Xuechun Xiao,Yude Wang
Fast and effective detection of harmful gases is crucial criterion for the current development of gas sensors. In this paper, a novel n-butanol gas sensor using Al-doped CdIn 2 O 4 nanofibers (ACO NFs) is synthesized by an electrospinning method . The different morphologies of the as-prepared ACO NFs are controlled by doping different Al contents . Systematic characterizations demonstrate that the doping of Al to CdIn 2 O 4 NFs would enhance the reaction activities between the gas and sensing materials, such as generating large amounts of adsorbed oxygen and improving the specific surface area of sensing materials. The results show that the detection limit of all prepared sensors for n-butanol is sub-ppm, and less than 250 ppb. The optimal Al-doped CdIn 2 O 4 (5.0% Al/Cd molar ratio) based gas sensor results in 3.32-fold enhancement in gas response to 200 ppm n-butanol at an operating temperature of 300 °C and exhibits excellent long-term stability compared with the pure CdIn 2 O 4 . Hence, ACO NFs can be regarded as a promising sensing material for low-concentration n-butanol gas detecting. Also, the mechanisms for improving the sensing performance of ACO NFs based gas sensor are proposed.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Xianyi Tang,Cheng Tong,Lianqiao Tan,Zidong Wei,Meng Wang
Lithium-Sulfur Batteries (LiSBs) are prevented to apply in practice by the irreversible loss from the cathode and difficult conversation kinetics of lithium polysulfides (LiPSs). An ideal S host material should possess high conductivity and sufficiently dispersed catalytic active sites to precisely restore the dissolved LiPSs to the surface of the S host material. In traditional catalyst design, porous carbonaceous materials are often selected as carriers for the nano-catalytic activity sites. However, non-polar pure carbon interfaces, where without nano-catalytic activity sites covered, have a very weak affinity to LiPSs. Here, we use ammonia as a nitrogen source to anneal the reduced aerogel (graphene oxide (rGO) supported nano-TiO 2 ) at high temperatures. The N element is atomically doped into the lattice of the carbon matrix, and the nano-TiO 2 is converted to nano-TiN. A hierarchically porous and high conductivity TiN/N-C is prepared, in which the nano-TiN is well dispersed on the surface of N-doped rGO as an active center for catalyzing LiPSs conversion. The doped-N elements significantly increase the proportion of the polar surface. The S@TiN/N-C composite cathode delivered an excellent long-life cycling performance, and the reversible discharge specific capacity faded from 1224 ± 16 to 675 ± 31 mAh g −1 after 930 cycles. More importantly, after 150 cycles with a high S loading, a reversible areal capacity of 4.1 mAh cm −2 can be achieved.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Changwei Li,Zhefeng Gu,Songming Zhu,Dezhao Liu
This study evaluated the contribution of biotic and abiotic routes to the 17 β -estradiol (E2) removal in moving bed biofilm reactors (MBBRs), and uncovered the interrelation between the E2 removal routes and biofilm characteristics, which was not researched in previous literature. Three MBBRs with different C/N ratios (0 for C/N 0 ; 2 for C/N 2 ; and 5 for C/N 5 ) were operated in continuous mode. A 65-day degradation demonstrated that the MBBRs had high potential to remove E2 regardless of the C/N (E2 removal greater than 99% for all MBBRs; P > 0.05). Further batch tests showed that the E2 removal mainly resulted from heterotrophic activities for all MBBRs, accounting for approximately 85% for all MBBRs (P > 0.05), followed by nitrification (10–11%) and adsorption (4–5%). Importantly, lower adhesive force likely led to higher E2 adsorption onto biofilms. Besides, enhanced ammonia oxidizing rate (AOR) was consistent with the high contribution of nitrification to the E2 attenuation. Importantly, heterotrophic activity was positively correlated with its contribution to E2 removal (r = 0.99, P < 0.05). To sum, the results obtained in this study helped to understand the E2 removal routes in nitrifying biofilm systems.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2013
·Vol. 42
·期 9
·1782-1793
·
IF 1.128
Lu Jia,Li Shu’ni,Zhai Quanguo,Jiang Yucheng,Hu Mancheng
The mean activity coefficients for CsCl in N -methylformamide or urea ( w ) + H 2 O (1 − w ) systems were determined in this work by potentiometry, using ion-selective electrodes at 298.15 K. The value of mass fraction w was varied between 0.00 and 0.40 in five unit-steps and the molality of CsCl was between 0.0020 and 1.4009 mol·kg −1 . The experimental data have been correlated with the Pitzer, modified Pitzer and the extended Debye–Hückel equations. The resulting values of the mean activity coefficients, the osmotic coefficients and the standard Gibbs energy of transfer, together with the Pitzer ion-interaction parameters ( β
(0) , β
(1) and C
φ ), extended Debye–Hückel parameters ( a , c and d ), and modified Pitzer parameters ( b , B
MX , C
MX ) are reported for the investigated systems.
研究领域:
化学
·
物理化学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2023
·
IF 3.8
Xiaoxue Zhang,Shuman Xu,Jing Hao,Xiaojin Xie,Fengqiu Chen,Dang guo Cheng
Single-crystalline hierarchical ZSM-5 zeolites with different particle sizes (namely 100, 140, and 200 nm) were successfully prepared by adjusting the amount of tetrapropylammonium hydroxide (TPAOH), and investigated in n -heptane catalytic cracking reaction. Diffusional measurements by zero-length column (ZLC) method showed that the apparent diffusivities of n -heptane decreased with the reduction of particle size, indicating the existence of surface barriers. Moreover, with the decrease of particle size, the additional diffusion path length increased, which meant the influence of surface barriers became more apparent. Despite the change of surface barriers, the intracrystalline diffusion still dominated the overall diffusion. Catalytic performance showed that the zeolite with smaller particle size had better stability.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL PAPERS
·
2016
·Vol. 70
·期 7
·888-897
·
IF 1.326
Yin Zhou,Rui-Ren Tang,Dan Song
N -hydroxyphthalimide (NHPI) combined with stable and recoverable transition metal–aluminium binary hydrotalcite-like compounds (M-Al HTLcs, M = Cu, Ni, Co) as an unprecedented catalytic system was demonstrated for the allylic carbonylation, as the model reaction, of cyclic olefins with tert-butyl hydroperoxide (TBHP), using isophorone (IP) to ketoisophorone (KIP). The results showed NHPI combined with Cu-Al HTLcs to be an efficient catalytic system and the influences of various reaction conditions of the catalytic reaction were optimised. A maximum IP conversion of 68.0 % with 81.8 % selectivity to KIP was afforded under the optimal reaction conditions. Experiments of repeatability and restorability showed Cu-Al HTLcs to be stable for at least five cycles without noticeable loss of catalytic activity. Expanding substrates could also be efficiently converted to the corresponding ketones under the optimised reaction conditions with appreciable yields. A plausible catalytic reaction mechanism was proposed.
研究领域:
化学
·
催化科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Yong Chen,Panwei Yu,Guoyuan Ren,Qiang Zhang,Qiuxia Han,Hongni Teng
Antibacterial modification of polymers with potent biocides via an efficient and universal approach is very desirable in both academia and industry. A polysiloxane with both quaternary ammonium and N-chloramine was prepared via a facile three-step synthetic route. Poly(methylhydrosiloxane) (PMHS) was first reacted with 2-(dimethylamino)ethyl acrylate to introduce an ending tertiary amine that was subsequently quaternized with 3-(3-chloropropyl)-5,5-dimethylhydantoin (CPDMH). The 5,5-dimethylhydantoin moiety was then transformed into its N-chloramine counterparts by chlorination with tert-butyl hypochlorite to produce quaternary ammonium (quat)/N-chloramine polysiloxane. The CO2-philic quat/N-chloramine polysiloxane was interpenetrated into polyethylene terephthalate (PET) in supercritical carbon dioxide (scCO2) and formed a 70 nm biocidal layer. The synthetic procedures and interpenetration results were characterized with Fourier transform infrared spectroscopy (FTIR), 1H NMR, scanning electron microscopy (SEM), and X-ray photoelectron spectrocsopy (XPS). The incorporation of quaternary ammonium and N-chloramine exhibited improved synergetic biocidal performance against Staphylococcus aureus and Escherichia coli, providing a complete kill of a 7-log reduction of both species within a contact time of 10 min. The polysiloxane interpenetration layer was stable and the rechargeability of lost chlorine was good when the layer was subjected to repeated washing, storage, and UV irradiation. This modification procedure uses ecologically responsible CO2 as solvent and is expected to be applicable to substrates of other chemistry since it does not rely on chemical linkage.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2018
·Vol. 10
·期 5
·619-626
·
IF 4.927
Houbo Zhou,Christopher M. Plummer,Huaan Li,Huahua Huang,Pengfei Ma,Le Li,Lixin Liu,Yongming Chen
Previously, we developed amination modification of polyethylene by metal-free organocatalytic reaction. Here, we applied this chemistry to modify isotactic polypropylene (PP) to investigate the regioselectivity to different carbons. Specifically, this reaction was conducted in tetrachloroethane at 100 °C under a nitrogen protection where C–N bonds were selectively generated from the tertiary C–H bonds of the PP backbone in the presence of N-hydroxyphthalimide (NHPI) and bis(2,2,2-trichloroethyl) azodicarboxylate (BTCEAD). The grafting content of BTCEAD was as high as 4.7 units per 100 propylene units. Thus, a methodology for the regioselective post-functionalization of PP without metal catalysts has been developed. The obtained PP-g-BTCEAD was sequentially used as an atom transfer radical polymerization (ATRP) macro-initiator to graft polymers, such as polystyrene (PS) and poly(methyl) methacrylate (PMMA). The grafting polymerization was unequivocally proved by multiple characterization methods. The graft copolymers were applied as phase compatibilizers to improve blending of PP with PS and PMMA.
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Guoxiang Yang,Haibo Yin,Wenhua Liu,Yuping Yang,Quan Zou,Liulin Luo,Huiping Li,Yuning Huo,Hexing Li
The hybrid Ag/TiO 2 -N photocatalyst was prepared via a supercritical solvothermal process in ethanol fluid. The simultaneous achievement of reduction of Ag + ions and N-doping in silver-ammonia complex solution led to the uniform distribution of Ag nanoparticles stably combined with the surface of TiO 2 -N substrate. As a result, the visible-light photocatalytic inactivation of Acinetobacter baumannii was facilitated via the enhanced visible light harvesting and the high separation efficiency of photo-induced charge carriers. By means of the main active species of O 2 − radical, the synergistic effect of Ag nanoparticles and TiO 2 -N could induce the structure change of bacteria with the leakage of K + ions as well as the mineralization of cell membrane with the elimination of self-repair function, leading to the final cell death. In comparison, the bactericidal activity of Ag nanoparticles and TiO 2 -N under UV light irradiation was due to the intrinsic efficiency and the high light harvesting, respectively. The photothermal effect of Ag nanoparticles in the near-IR light region could be possibly remained by TiO 2 -N substrate to achieve the antibacterial activity. Furthermore, Ag/TiO 2 -N photocatalyst played great bactericidal effect for kinds of bacteria, implying the applicable future to the medical disinfection.
研究领域:
材料科学
·
微生物学
·
光催化技术
✓ 已验证
DOI
高影响因子
Frontiers in Materials
·
2022
·
IF 3.985
Cao Ying,Li Wenjiao,Quan Fengyu,Xia Yanzhi,Xiong Zhong
Light-responsive hydrogel actuators show attractive biomedical applications for in vivo drug delivery tool, surgical tissue repair operation, and vascular cleaning due to its non-contact, rapid, precise, and remote spatial control of light. Conventional visible–light–responsive hydrogels contain special chemical structure or groups, and the difficulty in synthesis results in that few can be applied to fabricate visible–light–driven hydrogel actuators. In this study, based on photothermal effect, surface-modified Fe3O4 nanoparticles were incorporated into poly(N-isopropylacrylamide-acrylamide) hydrogel by UV photopolymerization, which revealed excellent green–light–responsive volume change. Under a laser irradiation of 200 mW at 520 nm, the bending angle deformation of hydrogel strips with 2.62 wt% Fe3O4 reached 107.8°. Strip-shaped hydrogel actuators could be applied to transport tiny objects. Furthermore, a boomerang-like hydrogel actuator was designed and fabricated to drive floating foam on water. By 12 cycles of continuous laser on–off irradiation to a hydrogel actuator underwater, a circular returning movement of the float was accomplished. The study on driving a float using visible–light–triggered hydrogel actuators provides a new idea for the design of light-driven biomedical devices and soft robots.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）