Carbohydrate Polymer Technologies and Applications
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2021
·
IF 0
Dongdong Qin,Xiaozhen Ma,Bao Zhang,Qing Luo,Haining Na,Jing Chen,Jin Zhu
A facile and environmentally friendly route has been put forward for fabricating regenerated cellulose-based composite films (RC) with graphene oxide addition (GO). Nanocomposite films prepared through the solution blending method of cellulose solutions to a reversible ion solvent system of dimethyl sulfoxide, 1,8-diazabicyclo [5.4.0] undec-7-ene, carbon dioxide (DMSO/DBU/CO 2 ) that contained a nano-additive of GO dispersion in DMSO. The results demonstrated that the addition of GO had a significant impact on the structural, mechanical, and gas barrier properties of the films. SEM and XRD results showed that GO was dispersed in cellulose solution uniformly. The evident red-shift of the characteristic functional groups in the Fourier transform infrared spectroscopy (FT-IR) spectra also indicated the interaction between GO and cellulose matrix. With 5 wt % GO, the oxygen permeability coefficient of corn cellulose films decreased from 1.59 × 10 −12 cm 3 cm cm −2 s −1 Pa −1 to 1.8 × 10 −15 cm 3 cm cm −2 s −1 Pa −1 . Meanwhile, the thermal stability of corn cellulose film improved with the incorporation of GO.
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DOI
FUEL
·
2021
·
IF 6.609
Haifeng Li,Tao Liu,Sheng Su,Mei Jin,Wen Fang,Lijun Liu,Yi Wang,Song Hu,Jun Xiang
Ce modified Mn x O y /Al 2 O 3 -La have been prepared to investigate the effect of Ce loadings on pre-breakthrough H 2 S removal efficiency, breakthrough sulfur capacity (BSC) and BSC durability of the sorbents during desulfurization-regeneration cycles. The results showed Ce modification could improve the pre-breakthrough H 2 S removal efficiency of regenerated sorbents during desulfurization-regeneration cycles. The XPS characterization showed that the Ce can promote the binding energy of Mn ion to shift to lower energy, which enhanced H 2 S adsorption on the regenerated sorbent. However, the Ce loading sequence had effect on BSC durability of sorbent during desulfurization-regeneration cycles. The Ce-Mn x O y /Al 2 O 3 -La with co-impregnation of Mn and Ce oxides had higher BSC than Mn x O y /Al 2 O 3 -La, while the Ce/Mn x O y /Al 2 O 3 -La with Ce loading on the surface of Mn x O y /Al 2 O 3 -La had lower BSC and worse BSC durability than Mn x O y /Al 2 O 3 -La. The characterization results showed Ce-Mn x O y /Al 2 O 3 -La obtained better surface area and pore structure than Mn x O y /Al 2 O 3 -La, and Ce ion can promote the increasing of the around electron density of Mn ion, which was beneficial for H 2 S adsorption of Ce-Mn x O y /Al 2 O 3 -La. The poor surface area and pore structure would cause the low BSC of Ce/Mn x O y /Al 2 O 3 -La, and less stability of pore structure might lead to poorer BSC durability of Ce/Mn x O y /Al 2 O 3 -La than Mn x O y /Al 2 O 3 -La during desulfurization-regeneration cycles.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Fangfang Su,Xiaoqian Li,Yudeng Wang,Zhongjie He,Ling Fan,Hongni Wang,Jinliang Xie,Yaping Zheng,Dongdong Yao
Porous liquids (PLs) are a type of porous materials that combine the porosity of solids and fluidity of liquids, which has attracted widespread attention. In this paper, we report a new TypeⅠhollow carbon sphere-based porous liquids, which are constituted of hollow carbon sphere (HCS) as the porous host, polymeric ionic liquid (PILs) as the corona and poly(ethylene glycol) 4-nonylphenyl 3-sulfopropyl ether potassium salt (PEGS) as the canopy. The viscosity of PLs is 8900 mPa·s at 50 ℃ (like syrup), which has good fluidity. Under 3 MPa pressure conditions, the best CO 2 adsorption capacity of 450-P[VHIm]Br-PEGS and 450-P[VBBI]Cl-PEGS are 2.06 and 1.90 mmol/g at 25 °C, respectively, higher than PILs-PEGS. Under the same conditions, the CO 2 adsorption capacity of PLs is 10.5 times higher than that of N 2 . Therefore, HCS-based PLs have the potential for CO 2 /N 2 selective gas separation. Not only PILs and the anionic alkyl chain of the outer layer widen the liquid range of PLs, but also is suitable for preparing PLs with other cavity units.
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2021
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IF 3.196
Zhufeng Shao,Wenhao Liu,Yufeng Zhang,Xiujuan Yang,Min Zhong
Novel MoS 2 nanobelts (NBs) decorated highly ordered alignment TiO 2 nanotubes arrays (TiO 2 -NTAs) with promoted photoelectrocatalytic (PEC) photodegradation and sensing performance under UV-Visible light irradiation were successfully synthesized via a facile combination of anodization and electrodeposition procedure. Simultaneously, the MoS 2 /TiO 2 -NTAs nanohybrids presented a significantly enhanced for PEC activity tests, which were mainly ascribed to the synergistic effect between MoS 2 NBs and TiO 2 -NTAs for the efficient separation of photogenerated carriers induced by the enlarged staggered band offset associated with sulfur vacancies defects. Furthermore, self-consistent interfacial charge transfer mechanism and convincing quantitative dynamic process (i.e. rate constant of charge transfer) for MoS 2 /TiO 2 -NTAs type-II nanoheterojunctions mediated with the p -type doping effect are proposed, which were evaluated by nanosecond time-resolved transient photoluminescence (NTRT-PL) and time-resolved photoluminescence (TRPL) spectra, respectively. Following this scheme, the photodegradation rate (η) toward degradation of methyl orange for optimum MoS 2 /TiO 2 -NTAs-2 nanocomplex was 96% irradiated by UV-Visible light, which are 1.2 and 1.1 times than that of MoS 2 /TiO 2 -NTAs-1 and MoS 2 /TiO 2 -NTAs-5, respectively. Furthermore, the PEC biosensing analysis of MoS 2 /TiO 2 -NTAs-2 was performed for detecting the glutathione, leading to an excellent detect limit of 1.6 μM and the sensitivity of 930 mA cm -2 M -1 . Additionally, the sensitivity of gas-sensing for MoS 2 /TiO 2 -NTAs-2 is 3.1, which are 1.3 and 1.1 folds than that of MoS 2 /TiO 2 -NTAs with MoS 2 deposited times 1 min and 5 min, respectively. It is distinctly manifested that the gas sensing performance of MoS 2 /TiO 2 -NTAs-2 toward ammonia gas is superior than that of MoS 2 /TiO 2 -NTAs-1 and MoS 2 /TiO 2 -NTAs-5 in terms of higher sensitivity degree and faster response speed.
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高影响因子
POLYMER
·
2021
·
IF 4.43
Linyan Wang,JiangTao Zhang,Youyi Sun,Tao Zhang,Long Wang,Jian Wang,Yurong Liang,Mingzheng Hao,Qiang Fu
A green and facile preparation method of graphene oxide/nitrile butadiene rubber (GO/NBR) nanocomposite film was developed for application in gas barrier. In the process, chemical crosslinks were formed by graphene oxide (GO)-induced crosslinking in absence of vulcanization ingredients. It was found that the GO-induced crosslinking occurred at a higher concentration of 1.0 wt% and a higher temperature of 170.0 °C. The GO-induced crosslinking did not only enhance the crosslinking density of GO/NBR nanocomposite film, but also enhanced interfacial interactions between GO and NBR matrix. The resultant GO/NBR nanocomposites with 3.0 wt% GO loading displayed enhanced tensile strength by ~145% as well as exhibited a dramatically decreased gas permeability coefficient by ~56% compared to the pristine NBR. The excellent comprehensive performance of GO/NBR nanocomposites was attributed to good barrier and high mechanical property of GO. In addition, the strong interfacial interaction between GO and NBR was also key role for enhancing tensile strength and barrier of GO/NBR nanocomposites. This ‘green’ and facile method provides new insights for the fabrication of high-performance GO/rubber composites for various applications.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Na Li,Ran Wang,Chongling Wang,Jing Gao,Zhiwei Liu,Jianmin Gu,Tifeng Jiao
The reasonable design of various functionalized nanocomposites based on black phosphorus (BP) has sparked substantial attention from researchers. In this work, the bulk BP was successfully exfoliated into nanosheets (BPNS), the polyethyleneimine (PEI) was selected as the surface protective layer to modify the BPNS for strengthening its stability. We have designed and synthesized two kinds of BPNS-PEI Langmuir composite films containing azobenzene compounds (BPNS-PEI/N-Azo and BPNS-PEI/PAA-Azo) by Langmuir–Blodgett (LB) technology. The composite films were successfully assembled and analyzed the nanoscale structure and morphology using transmission electron microscopy (TEM), atomic force microscopy (AFM), scanning electron microscopy (SEM) and other different characterization methods. In addition, the BPNS-PEI/N-Azo composite films were proven to demonstrate the photoisomerization stability and the acid-alkali atmosphere gas responsiveness by ultraviolet-visible spectroscopy and Fourier transform infrared spectroscopy . Furthermore, the photoelectrochemistry performances of the acquired LB composite films were studied by transferring multilayer films on indium tin oxide (ITO) substrates. And the results demonstrated that the BPNS-PEI/N-Azo self-assembled LB film electrode showed higher photoelectric conversion efficiency. The self-assembled films based on BP, undertaking an appealing conception for gaining a wide range of nano-optical devices, gas sensors and optoelectronic devices.
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高影响因子
ACS Applied Polymer Materials
·
2020
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IF 0
Dan Lv,Guosheng Tang,Long Chen,Mengjie Zhang,Jiaxin Cui,Ranhua Xiong,Chaobo Huang
Today, poor water and air quality caused by fine particulate matters (PMs), toxic spills, and antibiotic-containing wastewater are posing serious threats and risks to the environment and human health. Although many contaminant materials can be effectively removed by the traditional membrane technology, the simultaneous multifunctional materials like PM removal, oily water separation, and antibiotic adsorption are rarely reported. In addition, most of the membranes are destroyed when working in the harsh environment such as high temperatures, high pressures, strong acids and bases, and so on. In this work, a multifunctional Fe3O4@polyacrylonitrile/chitosan (Fe3O4@PAN/CS) membrane with robust stability and repeatable usage was fabricated via a simple and environment-friendly gas-spinning method; the obtained functional membrane is supposed to be applied in both air and liquid contaminant remediation. In comparison with the reported membranes, the multifunctional Fe3O4@PAN/CS composite nanofiber membranes not only have excellent performance in air filtration, antibiotic adsorption, or oil–water separation but also show robust reusability and durability even in harsh environments. Our strategy would bring ideas to the design and fabrication of multifunctional membranes for simultaneous environmental remediation such as air purification and wastewater treatment.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Kelin Hu,Feipeng Wang,Zijia Shen,Hongcheng Liu,Jianglin Xiong
In this paper, Pd/ZnO–SnO 2 hollow nanofibers prepared by electrospinning and magnetron sputtering . The sensing materials exhibited extraordinary hydrogen (H 2 ) sensing behavior – the response reached 171 at 270 °C, and besides, the response time and recovery time were as low as 19 s and less than 1 s at 240 °C, with steady high selectivity and good repeatability. Such an enhanced sensing performance could be attributed to the Pd/ZnO/SnO 2 ternary heterojunctions formed in the hollow nanofibers. Moreover, the materials were studied by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and especially the morphology formation process was further explained. The existence of Pd was confirmed to increase the resistance modulation range of heterojunction. In addition, the gas sensing mechanism based on the structure was proposed.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Qiang Zhang,Zhengya Dong,Shuainan Zhao,Zhikai Liu,Guangwen Chen
Ultrasound effect on the hydrodynamics and mass transfer behavior of gas–liquid Taylor flow is studied in ultrasonic microreactors with different frequencies (20, 28, 40 kHz) and channel dimensions (0.5 × 0.5, 1.0 × 1.0, 1.5 × 1.5, 2.0 × 2.0 mm 2 ). Upon ultrasound irradiation, intense bubble oscillation is excited on the slug bubble, accompanied by cavitation microstreaming vortices around it. The amplitude of bubble oscillation decreases with the decrease of channel dimension as a result of the confinement effect. Channel dimension of 1.0 × 1.0 mm 2 is considered as the critical dimension above which the confinement effect would be eliminated. More intensive bubble oscillation and cavitation microstreaming are observed at lower ultrasound frequency, where more significant mass transfer enhancement is also observed. At frequency of 20 kHz, the overall volumetric mass transfer coefficient is improved by 22 times at the power density of 0.14 W/mL. Adding surfactant (SDS) in the liquid increases the amplitude of bubble oscillation due to the decrease of interfacial tension. Such an increase in the oscillation amplitude enlarges the specific surface area, leading to an increase in the overall volumetric mass transfer coefficient with the increase of surfactant concentration. The detailed effect that how gas–liquid mass transfer would be enhanced by ultrasound is quantified by a mass transfer model, which could predict both the liquid side mass transfer coefficient and the specific surface area satisfactorily.
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高影响因子
AICHE JOURNAL
·
2020
·Vol. 66
·期 11
·e17015
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IF 3.519
Caijin Zhou,Bingqi Xie,Shaowei Li,Jisong Zhang
In this work, an unsteady-state strategy for rapid measurement of gas diffusivity in liquid is proposed, which has a quick perturbation of the liquid flow rate in inner tube for obtaining the change of gas flow rate across the membrane with time. The strategy has taken full advantages of the tube-in-tube reactor that possesses a high permeability Teflon AF-2400 membrane to accelerate the diffusion rate of gas to liquid without direct contact between the two phases. With a developed mathematical model fitting the recorded variation of gas flow rate with time, the gas diffusivity in liquid can be determined within 0.5–3 min compared with the conventional methods of 4–14 hr. In addition, the strategy is demonstrated with several gas–liquid systems (O 2 -DMSO, CO 2 -[Emim] [NTf 2 ] and CO 2 -[Bmim] [BF 4 ]) with varied viscosities and temperatures, showing a good agreement with literature values with less than 10% deviation.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2020
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IF 6.155
Tianyan Zhong,Huangxin Li,Tianming Zhao,Hongye Guan,Lili Xing,Xinyu Xue
A new self-powered/self-cleaned atmosphere monitoring system has been fabricated from TiO 2 nanoparticles through combining hydrovoltaic, gas sensing and photocatalytic effects. The TiO 2 nanoparticle film can convert natural thermal energy into electricity (hydrovoltaic effect) by the spontaneous water evaporation. The hydrovoltaic/gas-sensing coupling effect of TiO 2 nanoparticle offers the water-evaporation-powered gas detection performance, and the outputting voltage/current has a good response to the surrounding gas atmosphere, directly acting as the gas sensing signal. The zeta potential of TiO 2 is changed by the surface adsorption of gas molecules, and thus affects the electricity output of the system. The outputting electricity can directly power a wireless transmitter for transmitting the sensing information to external platform, and the whole system can work independently without electricity power supply. The rainwater can be used as the fuel of the system, and thus the system can be used outdoors without scheduled maintenance. Moreover, the photocatalytic activity of TiO 2 can effectively degrade the organic pollutants on the film under photo illumination, leading to a self-clean behavior of the system. The system can probably promote the development of green sensing techniques with evaporation-induced ability.
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高影响因子
Metals
·
2020
·Vol. 10
·期 12
·1574
·
IF 2.117
Ruochen Shen,Chaohui Pu,Xiaoou Xu,Youpeng Xu,Zhilin Li,Zhu Wu
The research aims to study the effect of adding mischmetal (Mm) to the TiFe0.86Mn0.07Co0.07alloy on its hydrogen storage performance and cyclic stability. The results show that TiFe0.86Mn0.07Co0.07+ x% Mm (x = 0,4,6,8) alloys can be easily activated. The hydrogen absorption capacity of TiFe0.86Mn0.07Co0.07+ 4% Mm reaches 1.76 wt% (mass fraction) at 298 K. With the increase of Mm addition, the hydrogen storage capacity decreases slightly. Furthermore, after 40 absorption and desorption cycles in hydrogen containing 250 ppm O2, the alloy still has 36% of its initial hydrogen storage capacity, and the alloy can recover 93% of its hydrogen storage capacity through heat treatment.Keywords:TiFe hydrogen storage alloys;life test;impure hydrogen gas;cyclic stability
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高影响因子
危险品化学品经营许可证（带存储）