COMPOSITES COMMUNICATIONS
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2021
·
IF 6.617
Congcong Tian,Fan Wu,Wenling Jiao,Xiaoyan Liu,Xia Yin,Yang Si,Jianyong Yu,Bin Ding
The recent outbreak of a coronavirus disease (COVID-19) has posed a great threat to public health and financial system. Most current masks used to prevent the spread of COVID-19 are typically absence of biocidal properties. We designed a novel polymer, polystyrene grafted by 5, 5-dimethylhydantoin and trimethylamine (PSDT), which possesses halamine site and cationic quaternary ammonia salt site. Furthermore, PSDT/PU [email protected] membranes (PSDT/PU NNMs) were obtained by electrospinning technology. Our strategy enables inherent N-halamine and quaternary ammonia salt (QAS) group to be covalently integrated into membranes, realizing the efficient and stable biocidal properties. Meanwhile, the introduction of nanonets endows electrospun membranes with prominent air filtration performance. The resulting membranes exhibit integrated properties of high interception of fine particles (96.7%) and low pressure drop (95.4 Pa). Besides, chlorinated PSDT/PU [email protected] membranes (with active chlorine content of 0.60 wt% and quaternary ammonia salt content of 2.20 wt%) exhibited superior bactericidal (>99.9999%) and virucidal (>99.999%) efficiency in a short time (2 min), which enables chlorinated PSDT/PU NNMs to be served as the filtration material by providing bacterial interception (99.77%) and contact killing against pathogens. The successful synthesis of PSDT/PU NNMs provide innovative insights for exploring filtration materials in a nanonet and biocidal form.
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Results in Chemistry
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2021
·
IF 0
Liu Yang,Hong Zheng,Lian Liu,Wenjie Wu,Shuya Wang
Biomass carbon materials have been widely used as electrode materials for super-capacitors (SC) due to their economic, environmental, and sustainable characteristics. In this work, we proposed that the Sapindus Mukorossi Peel (SMP) was used as a precursor to prepare a Sapindus Mukorossi Peel-based activated carbon material (SMPC) through carbonization and KOH activation. The morphology and structure of SMPC were characterized by various test methods. Cyclic voltammetry (CV), galvanostatic charge–discharge (GCD) and electrochemical impedance spectroscopy (EIS) were used to characterize its electrochemical performance. The results show that SMPC has suitable pore size distribution, a large number of heteroatom functional groups and excellent electrical conductivity. In addition, the amount of activator also has an important influence on the performance of SMPC. When the mass ratio of carbon material to KOH is 1:3, the prepared sample SMPC-3 has the largest specific surface area (SSA) was 1254.5 m 2 /g. Moreover, SMPC-3 also has excellent electrochemical properties, high specific capacitance (at 1 A/g, the specific capacitance can reach 314.5F/g), good cycle stability (at 5 A/g, cyclic charge and discharge 5000 times, the specific capacitance is only lost by 4.2%.), superior rate performance (when the current density is increased from 0.5 A/g to 10 A/g, the specific capacitance retention rate is 80.4%). Assembling SMPC-3 // SMPC-3 into a symmetrical SC shows higher energy density (at 0.1 A/g, the energy density is 6.68 Wh/Kg) and power density (at 5 A/g, the power density is 3250 W/Kg).
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ENERGY
·
2020
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IF 6.082
Rujie Wang,Shanshan Liu,Qiangwei Li,Shihan Zhang,Lidong Wang,Shanlong An
Blended amine solvents are considered potential alternatives to monoethanolamine for CO 2 capture, for the fast absorption kinetics of primary/secondary amine and low regeneration penalty of tertiary amine. In this research, blended amine solvents comprising N,N-dimethylcyclohexylamine (DMCA) and N-methylcyclohexyamine (MCA) were proposed. CO 2 absorption increased the polarity of the products and ensured the absorbent remained homogenous throughout the absorption/desorption cycles. Through quantum chemical calculation, the low stability of MCA-carbamate was confirmed by a ΔΔG 3 value of −6.41 kcal/mol, and a possible reaction route from carbamate to bicarbonate was revealed. Thus, the CO 2 capacity of DMCA-MCA reached 0.875–0.985 mol CO 2 /mol amine. Moreover, MCA exhibited considerably low forward energy barrier for zwitterion formation (2.7 kcal/mol), and the CO 2 absorption of DMCA could be accelerated through the proton transfer reaction with the MCA-zwitterion. Accordingly, the total mass transfer coefficient of CO 2 in DMCA-MCA approached 2.02 × 10 −10 mol/cm 2 s Pa, which was 1.2-fold higher than that of 5 M MEA. The total regeneration energy of DMCA-MCA blend was estimated at 2.20 GJ/t CO 2 , which was 44.9% lower than 5 M MEA. This study developed a novel DMCA-MCA blended solvent with rapid absorption rate, huge CO 2 capacity and efficient regeneration for CO 2 capture.
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高影响因子
APPLIED ENERGY
·
2020
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IF 8.848
Min Xiao,Wenchao Zheng,Helei Liu,Xiao Luo,Hongxia Gao,Zhiwu Liang
Protonation and carbamate formation are critical reactions for CO 2 capture using amine-based absorbents which impact both CO 2 absorption and amine regeneration. In this regard, thermodynamic analysis towards CO 2 absorption in N -methylaminoethanol solution is carried out with specific attention to the corresponding protonation and carbamate formation reactions. The CO 2 absorption mechanism is investigated with the acquisition of reaction equilibrium constant and heat of reaction. CO 2 absorption performance of N -methylaminoethanol solution was evaluated in terms of CO 2 loading and solution pH. A thermodynamic model was then developed to mathematically describe the investigated system and make prediction on equilibrium CO 2 solubility, species profiles, and absorption/regeneration heat. Results show that the average relative deviation of equilibrium CO 2 solubility calculated from the is 4.2%. The predictive species profile and CO 2 absorption heat of N -methylaminoethanol solution indicates less energy cost to desorb CO 2 . This is in line with the relative unstable N -methylaminoethanol carbamate formation and consequential conversion to (bi)carbonate. The position of N -methylaminoethanol as a potential absorbent in amine based carbon capture is shown in terms of chemical reaction constants, equilibrium CO 2 solubility, second order rate constant ( k 2 ), and p Ka .
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高影响因子
ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Zhouxian Li,Qi Wang,Jiawei Mao,Lingyi Zhang,Weibing Zhang,Mingliang Ye
A challenge for shotgun proteomics is the identification of low abundance proteins, which is always hampered owing to the extreme complexity of protein digests and highly dynamic concentration range of proteins. To reduce the complexity of the peptide mixture, we developed a novel method to selectively enrich N-terminal proline peptides via hydrazide chemistry . This method consisted of ortho -phthalaldehyde (OPA) blocking of primary amines in peptides, reductive glutaraldehydation of N-terminal proline and solid phase hydrazide chemistry enrichment of aldehyde-modified N-terminal proline peptide. After enrichment, the number of detected peptides containing N-terminal proline increased from 1304 to 4039 and the ratio of N-terminal proline peptides jumped from 4.4% to 93.7%, showing good enrichment specificity towards N-terminal proline peptides. Besides, the ratio of identified peptides to proteins was decreased from 7.8 (29751/3811) to 1.5 (4347/2821), indicating that sample complexity was drastically reduced through this method. As a result, this novel approach for enriching N-terminal proline peptides is effective in identification of low abundance protein owing to the reduction of sample complexity.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Hongjing Wang,Dandan Yang,Songliang Liu,Shuli Yin,Hongjie Yu,You Xu,Xiaonian Li,Ziqiang Wang,Liang Wang
The design of active and durable cathodic electrocatalysts with low Pt loading is critical for efficient oxygen reduction reaction. Herein, a general method is reported to prepare monodispersed Pt nanoparticle encapsulated in N-doped hollow carbon sphere with cage-bell structure (Pt@NHCS) by hard-template method. The materials with ultralow Pt content (2.8 wt%) possess typical a thin N-doped carbon layer (~12 nm) as a shell and monodispersed Pt nanoparticle (~20 nm) as a core. Due to unique structure and potential synergistic effect from interaction between Pt and nitrogen species, the cage-bell Pt@NHCS shows excellent catalytic activity and methanol-tolerant durability for oxygen reduction reaction. This method is of significant importance for the design of cost-efficiency electrocatalysts with cage-bell structure for excellent oxygen reduction reaction and beyond.
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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
Shasha Wang,Junfeng Miao,Mengshuai Liu,Lihui Zhang,Zhenfa Liu
Novel microporous carbon xerogels (CX-HMTAs) with different morphologies and well-developed porosity were successfully fabricated. The hierarchical pore, surface structure, and nitrogen content could be easily controlled by adjusting the amount of hexamethylenetetramine (HMTA). The samples as-obtained exhibited high micropore volume and large specific surface area, which were applied as supercapacitor electrodes and CO 2 capture materials. The CX-HMTA4 with a moderate concentration of HMTA (0.72 %) afforded the highest CO 2 adsorption capability with 4.21 mmol g −1 at 273 K and 1 bar, and excellent ideal adsorption solution theory (IAST) selectivity with 70 for CO 2 /N 2 capture at 298 K. Moreover, the CX-HMTA4 were simultaneously conducted as a supercapacitor electrode, and gave a maximum specific capacitance of 161 F g -1 and high stability (retained 99.4 % capacity after 1000 cycles) in 6 M KOH electrolyte at 1 A g -1 , showed a great advance when compared with most reported benchmark carbon materials. The multifunctional porous carbon materials presented herein were facilely prepared without any activation, exhibiting considerable potentials for large-scale gas adsorption/separation and electrochemical energy storage.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2021
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IF 7.963
Ying Han,Kemin Zhang,Qingjie Lu,Zhao Wu,Jun Li
Since iron (Fe) was first proven to have a strong reduction ability, it has been successfully applied to remove pollutants from water. In this study, nickel hydroxide (Ni(OH) 2 ), a catalyst commonly used in hydrogen evolution reactions, was added to improve the activity of Fe to remove N- nitrosodimethylamine (NDMA). The results showed that with the increasing Ni(OH) 2 dosages, the reactions accelerated. The NDMA removal rates increased when the pH value was 6 or 7. Further, when the dissolved oxygen concentration was in the range of 0–12.0 mg∙L −1 , it had little effect on the Fe/Ni(OH) 2 system, and all the reactions obeyed pseudo-first-order kinetics. 1,1-dimethylhydrazine and dimethylamine were formed during NDMA degradation. The capture of active substances and electron spin resonance method confirmed that the main active species were active hydrogen atoms , which participated in the removal of NDMA. Ni(OH) 2 acting as a catalyst was confirmed using wide-angle X-ray diffraction, X-ray photoelectron spectroscopy and Ni 2+ dissolution. Further, catalytic hydrogenation was proposed as the main removal mechanism as Ni(OH) 2 promotes the corrosion of Fe and dissociation of water, thereby generating more active hydrogen atoms. In addition, Ni(OH) 2 may activate both Fe and NDMA. This technique could be employed as an alternative for NDMA reduction and expand the application field of Ni(OH) 2 .
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PubMed
高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 9
·095501
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IF 1.929
Ruijie Jiang,Lingling Xu,Nan Wu
Nontoxic, low-cost microcapsule phase change materials (MicroPCMs) were successfully manufactured via suspension polymerization, in which n-dodecanol was employed as the core material and crosslinked polymethyl methacrylate as the wall material. Alkylphenol polyoxyethylene ether (OP-10), polysorbate-20 (Tween-20), sodium salt of styrene-maleic anhydride polymer (SMA), sodium dodecyl sulfonate (SDS), and hexadecyltrimethylammonium chloride (1631) were employed as emulsifiers to investigate the effects of the type and amount of emulsifier on MicroPCMs. In addition, the effects of different types of crosslinking agents on the fabrication of MicroPCMs were investigated. Scanning electron microscopy was used to observe the micro-morphology of MicroPCMs. The chemical structure of the MicroPCMs was detected via Fourier transform infrared spectroscopy. The thermal properties and thermal stability of the MicroPCMs were analyzed using a differential scanning calorimeter and a thermal gravimetric analyzer, respectively. Particle size distributions of the MicroPCMs were measured using a particle size analyzer. The results demonstrate that MicroPCMs with regular morphology were prepared when the mass ratio of the SMA to the oil phase was 3%, and the latent heat and yield of the MicroPCMs were 80.29 J g−1 and 84%, respectively. Furthermore, the MicroPCMs were successfully synthesized using pentaerythritol triacrylate containing the hydroxyl group as the crosslinking agent with an average particle size of 14.18 μm and excellent thermal stability.
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Journal of Spectroscopy
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2020
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IF 1.243
Liang Zhao,Chaoyu Jing,Yu Jin,Jiangping Chen,Ke Yin,Sujun Yang,Bingqing Liu,Xiao Han,Jianyu Tan
The optical constants of a liquid hydrocarbon such as liquid n-octane are basic material properties that may be used to evaluate their thermal radiation transfer capabilities. In this study, the ellipsometry method was used to measure the optical constants of liquid n-octane in the midinfrared wavelength range of 2.0–16.0 μm at temperatures of 20, 50, and 80°C. Experimental analyses indicate the significant effect of temperature on the refractive index, although it has little effect on the absorption index. With increasing temperature, the refractive index shows a linear decrease, and reduced density leads to weaker absorption intensities. The radiative properties of n-octane droplets, including the absorption and scattering efficiency factors of single droplets with droplet radii r = 10, 20, 50, and 100 μm and the absorption and scattering coefficients in a droplets-air system of droplet volume fractions fv = 2%, 3%, and 4%, were calculated using Mie theory. The numerical results indicate that, with increasing temperature, the absorption efficiency factor slightly decreases, and the variation trend of the scattering efficiency factor is more complicated. With increasing droplet radius, the absorption efficiency factor increases within the studied wavelength range, except for certain absorption peaks, but the scattering efficiency factor tends to decrease. While the absorption is greater, the scattering is weaker for a given droplet radius. With an increasing volume fraction of n-octane droplets, the absorption and scattering coefficients increase linearly within the studied wavelength range.
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高影响因子
Advanced Materials Technologies
·
2020
·Vol. 5
·期 9
·2000288
·
IF 5.969
Ruisi Chen,Junhui Tang,Yajie Yan,Ziqi Liang
Carbon nanotubes (CNTs) have been demonstrated as promising candidates for thermoelectrics (TEs) owing to their excellent electrical and mechanical properties. Here a new dopant to obtain flexible n-type CNT-based TE films from solution is reported. By doping single-walled carbon nanotubes (SWCNTs) with tetrabutylammonium bromide (TBAB), p-type nanotubes can be successfully converted to n-type form, which is confirmed by both Raman and X-ray photoemission spectroscopy (XPS) spectra. Furthermore, the influences of doping concentration and dispersion medium on TE properties are investigated. The optimal n-type SWCNT films fabricated in N , N -dimethylformamide (DMF) solvent exhibit an impressive power factor of 339 µW m −1 K −2 and excellent air stability by less than 10% variation of Seebeck coefficient during 192 h at room temperature without encapsulation, both of which are among the hitherto highest reported. This work sheds light on the interaction between TBAB molecules and SWCNTs in different dispersion media and offers a guideline for efficient n-doping of SWCNT based TE materials.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2020
·Vol. 22
·期 14
·7218-7223
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IF 3.43
Mengyao Lv,Haichuan Guo,Hangjia Shen,Jun Wang,Jiacheng Wang,Yuichi Shimakawa,Minghui Yang
A key challenge in carrying out an efficient oxygen reduction reaction (ORR) is the design of a highly efficient electrocatalyst that must have fast kinetics, low cost and high stability for use in an energy-conversion device (e.g. metal–air batteries). Herein, we developed a platinum-free ORR electrocatalyst with a high surface area and pore volume via a molten salt method along with subsequent KOH activation. The activation treatment not only increases the surface area to 940.8 m2 g−1 by generating lots of pores, but also promotes the formation of uniform Fe3C nanoclusters within the atomic dispersed Fe–Nx carbon matrix in the final material (A-FeNC). A-FeNC displays excellent activity and long-term stability for the ORR in alkaline media, and shows a greater half-wave potential (0.85 V) and faster kinetics toward four-electron ORR as compared to those of 20 wt% Pt/C (0.83 V). As a cathode catalyst for the Zn–air battery, A-FeNC presents a peak power density of 102.2 mW cm−2, higher than that of the Pt/C constructed Zn–air battery (57.2 mW cm−2). The superior ORR catalytic performance of A-FeNC is ascribed to the increased exposure of active sites, active single-atom Fe–N–C centers, and enhancement by Fe3C nanoclusters.
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