JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Tao Yang,Yukun Sun,Xianyang Meng,Jiangtao Wu,J. Ilja Siepmann
This work reports new experimental data for the density and viscosity of n -decane + CO 2 binary mixtures. A simultaneous density and viscosity measurement apparatus was redesigned using a vibrating–wire viscometer coupled with a vibrating–tube densimeter. The measurements for the pure component ( n -decane) and three different binary mixtures ( n -decane + CO 2 ), with mole fractions of n -decane of (0.4026, 0.2225, 0.1262), were carried out at temperatures ranging from (303.15 to 373.15) K and pressures up to 80 MPa. The expanded relative uncertainties ( k = 2, level of confidence = 0.95) were estimated to be 0.2% for density and 3.0% for viscosity over the entire measurement range, respectively. Densities were correlated as a function of temperature and pressure through a modified Tait–type equation with an average absolute percentage deviation less than 0.05%. To model the viscosity of the binary mixtures as a function of temperature, density, and composition, the extended hard–sphere method combined with simple quadratic mixing rules were used to describe our experimental data. Good agreement is found between experiments and correlations, which attests to the predictive capabilities of semi–empirical equations. In addition, Monte Carlo simulations in the isobaric-isothermal ensemble with the Transferable Potential for Phase Equilibria–United Atom (TraPPE–UA) force field were carried out to characterize the microscopic structure of the studied systems.
研究领域:
化学工程
·
流体力学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2011
·
IF 2.089
Lingling Zhang,Yongsheng Guo,Juan Xiao,Xianjie Gong,Wenjun Fang
Densities and viscosities were determined over the whole composition range for the binary mixtures of exo-tetrahydrodicyclopentadiene with n-nonane, n-dodecane, or n-tridecane at different temperatures (293.15, 298.15, 303.15, and 313.15) K and atmospheric pressure. The excess molar volumes VmE for the mixtures were calculated from the experimental data. The refractive index and surface tension of the systems were also measured for temperatures of (293.15 and 303.15) K.
研究领域:
物理化学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 16
·9171-9183
·
IF 14.511
Shu Cai,Xiaoxue Zuo,Haiyan Zhao,Shengjiong Yang,Rongzhi Chen,Liwei Chen,Ruihong Zhang,Dahu Ding,Tianming Cai
Elimination of trace organic contaminants from complex environmental matrices is of great importance for environmental remediation. Herein, the efficient removal of trace antibiotics and hydrocarbons from livestock wastewater and contaminated groundwater was realized using a newly prepared N-doped carbon catalyst (PDA–gCN-1.0). Specifically, carbon nitride (g-C3N5) was synthesized and coated with polydopamine (PDA), which could inhibit the N-loss during the thermal treatment, as well as serve as an exogenous nitrogen source. The resultant metal-free catalyst PDA–gCN-1.0 (dopamine : g-C3N5 = 1 : 1) possessed abundant N configurations, and could effectively activate peroxymonosulfate (PMS) and peroxydisulfate (PDS). Typically, with 50 mg L−1 PDA–gCN-1.0 and 1 mM PMS, sulfamethoxazole (SMX, 10 mg L−1) could be completely oxidized within 5 min (k = 1.691 min−1), surpassing most state-of-the-art catalysts (e.g., Co3O4 nanoparticles, graphene oxide, activated carbon). The oxidation process was found to be dominated by the nonradical mechanism, instead of the radical species. More specifically, electron-transfer between organics and high potential C–PMS* complexes played a significant role. The transformation pathways of SMX were proposed based on the identified intermediate products, and the toxicity of the corresponding products were predicted using the ECOSAR program. Finally, the eliminations of trace antibiotics (from livestock wastewater) and hydrocarbons (from contaminated groundwater) were investigated by the developed PDA–gCN-1.0/PMS process. The much higher removal efficiencies of target organic contaminants than TOC removal efficiencies clearly demonstrated the satisfactory selectivity of the nonradical-dominated PDA–gCN-1.0/PMS process. The reduced inhibition rate of E. coli confirmed that the developed advanced oxidation process was effective for the toxicity reduction of the wastewater. The findings of this work would shed new light on the applications of metal-free catalysts in environmental remediation.
研究领域:
环境科学
·
催化化学
·
水处理工程
✓ 已验证
DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Lulu Yan,Yahe Zhang,Hongyu Yan,Yu Fan,Xuxia Liu,Chao Ma,Quan Shi
CS2/N-methyl-2-pyrrolidone (NMP) could extract much more substance from coals than any other solvents. Investigation on the molecular composition of CS2/NMP extracts from lignite is significant for the understanding of high extraction yield and the clean utilization of coal. The methanol-soluble portions from lignites and CS2/NMP extracts of lignites were characterized by electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry. The yield of CS2/NMP extracts from lignite was quite higher than that of methanol extracts. Furthermore, the yield of methanol-soluble portions from CS2/NMP extracts was far more than that of methanol extracts from lignite. At the level of molecular composition, the relative content of heteroatom compounds with more oxygen atoms, longer side chain, and higher condensation in the CS2/NMP extract was also higher than that in the methanol extract. Despite great difference in the yield and the relative content of components, the distributions of species, molecular weight, carbon number, and double-bond equivalent were similar to those of most organic molecules for the methanol extract and methanol-soluble portions from the CS2/NMP extract. These phenomena suggested that organic molecules with similar structure but different composition, nonuniformly distributed in the coal matrix, were released more in the CS2/NMP extract compared to the single methanol extract.
研究领域:
能源化学
·
分析化学
✓ 已验证
DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Yuqing Li,Sha Liu,Shan Tao,Yan Zhu,Qiming Zhao
A novel metal-free, reusable, and green catalytic system comprising hydrothermal carbon microspheres (HCMSs) supporting N-hydroxyphthalimide (NHPI) was developed and employed in the aerobic oxidation of alcohol. Hierarchically porous HCMSs with good monodispersity were produced by the hydrothermal carbonization of sucrose and designed NaOH-impregnated calcination under a static air atmosphere. The meso- and macroporous pores on HCMSs make up 71% of the total pore volume. The covalent immobilization of NHPI onto HCMSs was first accomplished by grafting hyperbranched polyquaternary amine via repetitive ring-opening reactions of diglycidyl ether and subsequent amidation with 4-carboxy-NHPI. Owing to the cocatalysis of grafted quaternary ammonium salt, a designed heterogeneous catalyst has superior performance to free NHPI in the oxidation of 2-phenylethanol. The established catalytic system achieved 42% conversion and up to 96% selectivity of acetophenone at 90 °C under 1 atm O2 for 20 h and presented a versatile catalytic effect for diversified alcohols. Immobilized NHPI could be facilely recycled via simple filtration and displayed good stability for six cycles without a discernible decrease of reactivity or damage of catalyst morphology in repeated oxidation test.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Chenxiao Lin,Demei Yu,Jixia Wang,Yan Zhang,Dong Xie,Faliang Cheng,Shiguo Zhang
Anion exchange membrane (AEM) fuel cells have received significant attention due to their low fuel permeability and the use of non-platinum catalysts. However, the development of AEMs with robust chemical stability and high conductivity is still a great challenge. Herein, we prepare a new type of partially fluorinated backbone bearing pendent N-spirocyclic quaternary ammonium (QA) cations via a facile Williamson reaction , which displays great potential for fuel cells. The integration of the two substructures (a fluorinated moiety into a polymer backbone and a pendent cation structure) is beneficial for the fabrication of a well-defined micro-phase separation structure, thereby facilitating the construction of a highly-efficient ion transporting pathway. Correspondingly, the resulting AEM (PAENQA-1.0), despite its a relatively low ionic exchange capacity (0.93 meq g −1 ) demonstrates a conductivity of 63.1 mS cm −1 (80 °C). Meanwhile, the constrained ring conformation of N-spirocyclic QA results in improved stability of the AEMs.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 11
·3039-3047
·
IF 3.146
Zhang Pan,Zhao Yuetong,Tian Xiangfeng,Ji Yanxi,Shu Yuxuan,Fu Kun,Fu Dong,Wang Lemeng
Tetramethylammonium glycine ([N 1111 ][Gly]) can be completely ionized into cation [N 1111 ] + and anion [Gly] - in aqueous solution. The anion contains an amino -NH 2 and a carboxyl -COO - , both of which can react with hydrogen sulfide (H 2 S). Therefore, [N 1111 ][Gly] was used to promote the selective absorption of H 2 S in coke oven gas (COG) by N-methyldiethanolamine (MDEA). The absorption performance and selectivity of H 2 S in the aqueous solution of MDEA-[N 1111 ][Gly] were investigated. The effects of MDEA mass fraction, [N 1111 ][Gly] mass fraction, temperature, H 2 S partial pressure and CO 2 partial pressure on the absorption capacity and selectivity were clarified. The results showed that an aqueous solution of MDEA-[N 1111 ][Gly] has good selectivity for H 2 S in COG. The absorption capacity was large and the mass fraction of the solute in the absorbent reached more than 0.55, thereby having outstanding advantages in the aspects of saving energy consumption and operating cost and having a good application potential.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF RAMAN SPECTROSCOPY
·
2016
·Vol. 48
·期 2
·243-250
·
IF 2.395
Lin Wang,Yan Zhang,Wenqi Zhang,Tianrui Ren,Feng Wang,Haifeng Yang
Silver nanoparticle (AgNP)/poly( N -isopropylacrylamide) (PNIPAAm) composite solution was electrospun followed by crosslinking to fabricate AgNP/PNIPAAm composite nanofiber mats. Embedded AgNPs were found to align along the PNIPAAm nanofibers, which generate more hotspots upon laser-induced plasmonic heating. This kind of AgNP/PNIPAAm mats show enhanced surface-enhanced Raman scattering (SERS) effect upon continuous pulsed laser irradiation, showing a ‘laser heating sensitive’ SERS effect. Laser-induced plasmonic heating can also tune the temperature-responsive interaction between PNIPAAm and analytes and has been applied in the on-site ‘laser heating sensitive’ separation and SERS detection of analytes. The composite nanofiber mats also showed good reproducibility and stability. What is more, this ‘laser heating sensitivity’ has also been applied in the direct SERS detection of adenosine in urea solution without urea interference. Together with the advantages of ease of large-scale fabrication, stable and ‘laser heating sensitivity’, AgNP/PNIPAAm mats might find application in sensitive multicomponent biosensing. Copyright © 2016 John Wiley & Sons, Ltd.
研究领域:
材料科学
·
分析化学
·
生物医学工程
✓ 已验证
DOI
高影响因子
CORROSION
·
2013
·Vol. 69
·期 7
·672-680
·
IF 1.772
Jiang Y.Y.,Chen Y.,Ye Z.Y.,Chen H.,Zhang Z.,Zhang J.Q.,Cao C.N.
N-[2-[(2-aminoethyl) amino] ethyl]-9-octadecenamide (AAOA) has been synthesized in the lab, then tested as an effective and economic acid inhibitor for A3 steel in an acid medium with electrochemical techniques (electrochemical impedance and polarization curve). The results show that AAOA acts as a good mixed-type inhibitor for A3 steel in 1 M hydrochloric acid (HCl) solution, and the inhibition efficiency reaches 94% at the concentration of 200 mg/L. The corrosion current density of A3 steel increases with the increasing temperature from 20°C to 60°C. Meanwhile, Langmuir isotherm is found to provide the description of the adsorption behavior of AAOA, and the value of adsorption free energy (ΔG 0 ) is as low as low as −37.3 kJ/mol. One can assume the adsorption of inhibitor molecules on the metal surface is by chemisorption, which has been understood taking into account some other adsorption parameters (ΔH 0 , ΔS 0 ) and the activation parameters (E a , ΔH * , ΔG * ).
研究领域:
材料科学
·
腐蚀与防护
·
电化学
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Chuanyun Yang,Xingjian Zhang,Zhengdao Li,Zhishuai Wang,Jiping Shi,Haiquan Xie,Ting Li,Yong Zhou
A series of hybrid films were designed and fabricated by in situ growth of Ag 2 S nanoparticles with varying content on BiVO 4 nanosheets deposited on stainless steel mesh. The formation of a p-n heterojunction between Ag 2 S and BiVO 4 enabled an extended spectral response range and facilitated the separation of charge carriers through a single directional pathway for electron transport. Exploiting these advantages, Ag 2 S/BiVO 4 composites were employed in various photocatalytic applications under simulated solar irradiation. The results demonstrated, in terms of water purification, that the composite not only possessed photocatalytic ability to degrade RhB or Cr(VI) individually but also exhibited significantly enhanced photocatalytic efficiency in simultaneously removing mixed pollutants containing RhB and Cr(VI). In terms of CO 2 conversion, Ag 2 S/BiVO 4 also displayed a stronger photocatalysis capability compared to pure BiVO 4 film. Furthermore, the immobilized Ag 2 S/BiVO 4 film exhibited improved mechanical strength and long-term stability, making it highly suitable for practical applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Wanjun Jin,Cheng Li,Meiyi Zou,Yu Lu,Ming Wei,Lijing Nan,Yue Jia,Chengjian Wang,Linjuan Huang,Zhongfu Wang
Sialylated N-glycans are an integral component of whey proteins in human milk and play an irreplaceable role in infant growth and development. Currently, there are few studies on quantitative comparison of sialylated N -glycans in milk obtained at different lactation stages. Here, a preliminary isomer-specific quantification of whey sialylated N -glycans of human colostrum milk (CM) and mature milk (MM) was performed by using our recently developed glycoqueuing strategy. Such a preliminary comparison revealed that the whey sialylated N -glycan content was 86.4% lower in MM than in CM. Twenty-three α2,6-linked sialylated N -glycan isomers were detected with no α2,3-linked isomer observed. For the first time, three mono-sialylated and four bi-sialylated glycan isomers were reported. With the prolongation of lactation, the relative abundance of mono-sialylated glycans increased, whilst the relative abundance of bi-sialylated glycans decreased significantly. These findings contribute to the understanding of the structure–function relationship of sialylated N -glycans in the human whey fraction.
研究领域:
营养学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yushun Zhou,Taimei Cai,Shuai Liu,Yanyan Liu,Huijie Chen,Zhongtian Li,Jun Du,Zhiqiang Lei,Hailong Peng
Organic contaminants in aquatic ecosystems have raised serious environmental concerns and pose severe risks to human health, and the catalytic efficiency of traditional TiO 2 catalysts has been greatly limited by photogenerated electron/hole recombination. Therefore, a novel catalyst of N-doped magnetic three-dimensional (3D) carbon microspheres@TiO 2 with a nanofibrous porous architecture (N-doped MCMs@TiO 2 ) was developed from the low-cost biomass of chitin. The N-doped MCMs@TiO 2 consist of N-doped carbon nanofibers, a 3D porous architecture, and a high surface area. TiO 2 nanoparticles were uniformly immobilized on the N-doped carbon nanofibers, resulting in many catalytic sites. The current density of N-doped MCMs@TiO 2 was approximately 0.247 uAcm −2 with 1.65 times than that of pure TiO 2 , and the bandgap of N-doped MCMs@TiO 2 was only 1.91 eV. Additionally, N-doped MCMs@TiO 2 had excellent adsorption capability for tetracycline (TC) (60.38%) and methyl orange (MO) (40.15%) in the dark after 40 min. Under the optimized conditions, N-doped MCMs@TiO 2 exhibited remarkable photodegradation performance for MO and TC mixture solutions, the degradation efficiencies of MO and TC were approximately 83.80% and 74.37% under UV irradiation, and that of was maintained at 68.07% and 76.55% even in cloudy weather, respectively. Meanwhile, N-doped MCMs@TiO 2 possess good potential for practical applications with long-term stability and can be easily recycled from solutions under an external magnet. Therefore, this work provides new insight into the fabrication of low-cost biomass-based 3D hierarchical porous carbon materials and that can be used as high-performance photocatalysts for the degradation of organic contaminants.
研究领域:
环境科学
·
材料科学
·
生物工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）