APPLIED ENERGY
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2018
·
IF 7.9
Yao Shen,Chenkai Jiang,Shihan Zhang,Jun Chen,Lidong Wang,Jianmeng Chen
The main issue related to the deployment of the absorption based technology for CO 2 capture is the intensive energy penalty. Biphasic solvent is regarded as a promising candidate for CO 2 capture due to its potential in significant reduction of the energy consumption. However, currently, the development of biphasic solvents relies on the intensity of solvent screening work. To address this issue, this work investigated the relationships between the solvent properties and CO 2 capture performance such as absorption capacity, phase separation behavior, kinetics, and thermodynamics. Ten primary/secondary amines and eight tertiary amines with different alkalinity ( pKa ) and hydrophobicity (Log P) were used as the main components of the biphasic solvent . Experimental results revealed that the tertiary amine’s alkalinity determines the absorption capacity of the biphasic solvent. The maximum CO 2 absorption capacity was achieved by the tested biphasic solvent with a tertiary amine of a pKa around 9.8. Compared with the tertiary amine, the primary amine’s hydrophobicity was more sensible to the phase separation behavior of the solvent. The low Log P value of the primary amine and the high Log P value of the tertiary amine befitted the phase separation. Kinetic analysis indicate that the total mass transfer resistance of the rich solution decreased with the increase in the Log P value of the tertiary amine. Interestingly, the highest enhancement factor was achieved by the tertiary amine (2-(diethylamino)ethanol) with the pKa of 9.79. Further increase of the tertiary amine’s pKa decreased the enhancement factor of the biphasic solvent. This was attributed to the limitation of mass transfer of tertiary amine from the upper phase to lower phase. Furthermore, thermodynamic analysis showed that the sensible heat and the latent heat of the solvents decreased and increased, respectively, with the increase of log P value of the tertiary amines. The lowest reaction enthalpy and heat duty of the tested biphasic solvents were 45.8% and 52% lower than those of the benchmark monoethanolamine solution, respectively. Overall, compared with the primary amine, the selection of the tertiary amine is more important to achieve a great performance for CO 2 capture. Therefore, the tertiary amine with a moderate pKa and Log P is beneficial to achieve a high absorption capacity, fast absorption rate, and low heat duty of the biphasic solvent.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
RUSSIAN JOURNAL OF GENERAL CHEMISTRY
·
2025
·Vol. 95
·期 3
·644-653
·
IF 0.8
Wang J.,Zhou Y.,Wu X.,Zhou X.,Sun Y.,Wu W.,Wang X.
Discovering super-efficient herbicides with novel structures is one of the effective ways to solve the increasingly severe weed resistance problem and meet ecological requirements. In this work, a series of novel bromo- p -hydroxybenzamides were designed based on the molecular hybridization strategy, and rapidly synthesized by one-step amidation reaction, and then characterized by 1 H NMR, 13 C NMR and HRMS. The herbicidal activity assay indicated that most of the target compounds exhibited good-to-excellent inhibition effects on seed germination of two model plants. At a concentration of 100 mg/L, the inhibition rate of 3,5-dibromo- N -(4-bromo-3-chlorophenyl)- p -hydroxybenzamide reached up to 98 and 96% on the roots and stalks of the monocotyledonous barnyard grass ( E. crus-galli ), respectively. 3,5-Dibromo- N -(2-bromophenyl)- p -hydroxybenzamide showed excellent inhibitory activity on the roots and stalks of dicotyledonous rape ( B. napus ) at 100 mg/L, with an inhibitory rate of more than 90%. Furthermore, the concentration was reduced to 1 mg/L, the inhibitory rate of 3,5-dibromo- N -(2-bromophenyl)- p -hydroxybenzamide on the roots of B. napus was still as high as 90%. This work provides a novel molecular scaffold for the development and research of new super-efficient herbicides.
研究领域:
农药化学
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植物生理学
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DOI
高影响因子
TALANTA
·
2012
·
IF 3.794
Qin Liu,Xu Zhu,Zhaohui Huo,Xulun He,Yong Liang,Maotian Xu
Graphene (GR) was synthesized through electrochemical reduction of graphene oxide and characterized by spectroscopic and electrochemical techniques. Polyvinylpyrrolidone (PVP)/graphene modified glassy carbon electrode (PVP/GR/GCE) was prepared and applied for the fabrication of dopamine (DA) sensors without the interference of ascorbic acid (AA). Compared to bare GCE, an increase of current signal was observed, demonstrating that PVP/GR/GCE exhibited favorable electron transfer kinetics and electrocatalytic activity towards the oxidation of dopamine. Furthermore, PVP/GR/GCE exhibited good ability to suppress the background current from large excess ascorbic acid. Amperometric response results show that the PVP based sensor displayed a wide linear range of 5×10 −10 to 1.13×10 −3 mol/L DA with a correlation coefficient of 0.9990 and a detection limit of 0.2 nM (S/N=3). The determination of dopamine in urine and human serum samples were studied.
研究领域:
分析化学
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生物医学工程
✓ 已验证
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
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2015
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IF 3.569
Liang Zhang,Shuai Yuan,Shuo Chen,Dongrui Wang,Bao-Zhong Han,Zhi-Min Dang
Ag nanoparticles@polydopamine (AgNPs@PDA) core–shell particles were prepared by one-step oxidative–reductive reaction, which Ag + was used as oxidant and dopamine as reducing agent. The dopamine was polymerized to PDA surface and shielded the Ag nanoparticles . The AgNPs@PDA particles were used as fillers and introduced into poly(vinylidene difluoride) (PVDF) to prepare the AgNPs@PDA/PVDF dielectric composites. AgNPs were introduced aiming to increase the dielectric constant of the composites and PDA was employed to improve the compatibility between fillers and polymer. The morphology and the dielectric properties of the AgNPs@PDA/PVDF composite films were thoroughly investigated. The influencing factors to the dielectric performances of the composites were studied, including the ratio of AgNO 3 and dopamine, pH values of the preparing solution and the fraction of the fillers. The highest dielectric constant of the AgNPs@PDA/PVDF composites was about 53 when the content of fillers was 25 wt.% at 100 Hz. The percolation threshold of the composites was predicted at about 25.5 wt.%.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
POLYMER COMPOSITES
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2021
·Vol. 42
·期 9
·4775-4785
·
IF 3.171
Lu Shen,Xueqin Zhang,Yanzhou Lei,Mei Liang,Yang Chen,Wenbin Chen,Huawei Zou
For improving the mechanical properties of epoxy resin (EP), it is an effective strategy to utilize surface-modified graphene oxide (GO) as a reinforcement. However, there is nearly no report on surface modification using rigid short-chain grafted GO, especially with multiple reactive sites. In this work, a novel surface functionalization of GO with an amine-rich rigid short-chain was successfully prepared and applied as a filler for EP with simultaneously high toughness and mechanical strength. Superior toughness and mechanical strength of the resultant epoxy nanocomposite can be obtained by grafting amine-rich rigid short-chain onto GO (DHN-GO) owing to the enhanced interface binding ability with the EP and the optimized dispersibility in the matrix. Compared with the pure EP, the epoxy nanocomposites at an extremely low loading (0.75 wt‰) of DHN-GO showed excellent mechanical properties. The tensile strength, elongation at break, and bending strength are increased by 28%, 37%, and 29%, respectively. This work is expected to provide more inspiration for the preparation of GO/EP composites with high toughness and mechanical strength.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
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2020
·
IF 4.613
Tiechen Yu,Yuntao Han,Hongyan Yao,Zheng Chen,Shaowei Guan
In recent years, colorless-to-black electrochromic (EC) and electrofluorochromic (EFC) materials are attracting increasing interest for the fundamental scientific research and potential applications. In order to achieve multiple-response optoelectronic materials with better black conversion and solid-state fluorescence performance (black-color/emission dual-switchable materials), we adopted a novel design strategy to synthesis a diamine monomer named TPE-NH 2, in which the π-core tetraphenylethene (TPE) connects with two oxidation centers. All the polyamides/polyimides based on this monomer exhibited good solubility, thermal stability and aggregation-induced emission (AIE) activity. Among these, polyamide 5a not only showed rare EC properties (colorless-to-black) with ultra-low voltage (0–0.75 V), high optical contrasts (up to 87.9% at 692 nm) and fast switching times (2.04/1.45 s) but also demonstrated high fluorescence properties with the introduction of TPE. In addition, polyamide 5a showed good continuous switching stability for EC property and acceptable stability for EFC property, which makes it a potential candidate in EC/EFC applications.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2020
·
IF 7.632
Zain Ali Saleh Bairq,Hongxia Gao,Fatima Abduh Mohammed Murshed,Paitoon Tontiwachwuthikul,Zhiwu Liang
In the CO2 capture process, decreasing the energy consumption and increasing the desorption rate of loaded MEA-CO2 during the regeneration process of monoethanol amine have been identified as major challenges that need to be addressed. To overcome these challenges, three modified heterogeneous mesoporous catalysts, CMK-3-SiO2, CMK-3-MCM-41, and CMK-3-SBA-15, and a SO42–/ZrO2 solid acid catalyst were initially synthesized and investigated to determine their catalytic effectiveness in the process of CO2 and MEA solvent regeneration with a CO2 loading of 0.5 ± 0.02 mol CO2/mol MEA at 97 °C. According to the experimental results, the CMK-3-modified catalyst significantly decreased the energy requirement for CO2 desorption. The catalytic performance of the synthesized catalysts was in the order of CMK-3-SiO2 > CMK-3-MCM-41 > CMK-3-SBA-15 > SZ. CMK-3-SiO2 exhibited the best catalytic performance by enhancing the desorption rate by 195%, and decreasing the energy requirement by 37.41% compared to monoethanol amine as a blank run. Furthermore, the CMK-3-SiO2 catalyst exhibited the best catalytic performance compared to the literature with excellent stability and no unfavorable effects on the MEA-CO2 absorption activity for the regenerated amine solvent. This performance seems to be a result of the large mesoporous surface area (BET) and the large number of Brϕnsted and Lewis acid sites. In addition, a reasonable reaction mechanism for amine solvent regeneration with the CMK-3 heterogeneous catalyst is proposed.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Yonghui Tu,Long-Fei Ren,Yuanxin Lin,H. Susan Zhou,Jiahui Shao,Yiliang He
The traditional adsorbents for antimonate (Sb(V)) in industrial effluent suffered from poor adsorption capacity due to the lack of pores or adsorption sites. Three-dimensional (3D) amidoxime-polyacrylonitrile sphere (APANS) with hierarchical pores and abundant amidoxime groups was fabricated via nanoscale thermally induced phase separation (TIPS). The effects of fabrication parameters including diluent type, PAN concentration and amidoximation time on pore structure were studied with scanning electron microscopy (SEM), mercury intrusion instrument (MIP), fourier transform infrared spectrophotometer (FT-IR) and X-ray photoelectron spectroscopy (XPS). Results showed that APANS fabricated from 2% PAN/DMSO solution and amidoximated for 20 min had coarse surface, numerous mesopores , high porosity (88.5%) and large pore volume (20.5 mL/g). The pore formation mechanism revealed that the hierarchical pores were derived from multiscale DMSO crystals shaped by TIPS. Adsorption kinetics results showed that kinetics data were well fitted by pseudo-second-order model ( R 2 > 0.99) and the mesopores accelerated the adsorption (equilibrium time of 4 h) due to enormous surface excess and group exposure. Adsorption isotherm could be modeled by Freundlich ( R 2 > 0.99) and maximum adsorption capacity was 683.6 mg/g. The adsorption thermodynamics was also investigated, indicating the spontaneous and exothermic adsorption process . APANS exhibited excellent selectivity towards common anions (Cl − , SO 4 2− , NO 3 − and PO 4 3− ) and reliable reusability (preserving 80% capacity after five cycles). This adsorbent provided a clean and sustainable strategy for Sb(V) removal from aqueous environment by superhigh capacity, fast rate and reliable reusability.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Energy Storage Materials
·
2020
·
IF 16.28
Yu-Shan Zhang,Bin-Mei Zhang,Yu-Xia Hu,Jun Li,Chun Lu,Ming-Jin Liu,Kuangye Wang,Ling-Bin Kong,Chen-Zi Zhao,Wen-Jun Niu,Wen-Wu Liu,Kun Zhao,Mao-Cheng Liu,Yu-Lun Chueh
Graphite has been commercialized as a material of lithium ions batteries because of its abundant source, low cost and excellent conductivity while the small interlayer spacing of graphite limits its application for Na + insertion/extraction. Herein, an emerging and effective approach—chain-like H 2 N(CH 2 ) x NH 2 locked between graphene oxide (GO) sheets to expand the interlayer spacing of graphene with enhanced stability of layered structure was demonstrated by a dehydration condensation reaction . The as-obtained H 2 N(CH 2 ) x NH 2 , which can link GO (xDM-GO), exhibits a lock-link structure, resulting in expanded interlayer spacing, with which the excellent Na + storage performance with a high specific discharge capacity of 158.1 mAh g −1 at 0.1 A g −1 and outstanding capacity retention of 82.2% at a current density of 1 A g −1 can be achieved. The effects of interlayer spacing on Na + diffusion coefficient and the rate capability were investigated, for which 0.95 nm is the most suitable interlayer spacing for the Na + insertion/extraction. The novel strategy demonstrates an effective way to controllably tune the interlayer spacing with the improved structure stability of GO, resulting in the best Na + insertion/extraction behavior with the excellent Na + storage performance.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yuyang Yao,Junjie Mu,Junbin Liao,Jun Dong,Bin Luo,Huimin Ruan,Zhenlu Shen,Jiangnan Shen
In this work, a series of modified anion exchange membranes (AEMs) has been prepared via self-polymerization of L-dopa on the surface of commercial AEM (Fuji I type), followed by grafting the 4-amino-benzenesulfonic acid monosodium salt (ABS) on L-polydopamine thin layer. The chemical structures of modified AEMs were confirmed by the FTIR and XPS spectra. Our investigation demonstrates that the surface resistance of the modified AEM (L-PDA@ABS-Cl) increases slightly from 1.90 Ω cm 2 to 2.37 Ω cm 2 and the hydrophilicity of L-PDA@ABS-Cl significantly improves, verifying by the decreased water contact angles from 86.42° to 67.25°. The difference between pristine AEM and L-PDA@ABS-Cl in desalination rates only remained less than 4% throughout the test of 240 min. The modified AEMs have the negatively charged functional layers which produce an electrostatic repulsion effect and negatively charged bacteria cannot attach to the membrane surface. As a result, L-PDA@ABS-Cl shows good performance on fouling resistance, good inhibition effect on Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ). Low surface resistance and superior foul inhibition performance indicate the potential application of modified AEMs in electrodialysis (ED).
研究领域:
材料科学
·
环境工程
·
生物医学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Xueyan Liu,Zhuo Chen,Rongsheng Gao,Chengyou Kan,Jianhong Xu
Recently, the colorimetric quantitative method based on a smartphone and red–green–blue (RGB) analysis is applied to provide rapid on-site monitoring of metal ions. To develop such a fluorescent and colorimetric chemosensor for Fe 3+ , the functionalized polyacrylamide hydrogel P(AM- co -MBA- co -RhBUEA) was synthesized by free radical polymerization on the basis of a rhodamine-based probe RhBUEA. The physicochemical properties and sensing behavior of the functionalized hydrogel were investigated by FTIR, SEM and fluorescence spectral analysis. And the effects of MBA and RhBUEA amount on gel content and swelling properties were explored. According to the recipe of 1.0 wt.% MBA, 2.0 wt.% RhBUEA to the total monomers, the fabricated hydrogel displayed excellent selectivity, sensitivity and reversibility for Fe 3+ sensing in the pH range of 4.95–8.02, with the detection limit of 0.088 μM for the fluorescent quantitative method and the response time less than 20 min, accompanied with a distinct color change. Owing to the integration of RGB analysis with colorimetric responses, the functionalized hydrogel permitted the convenient, simplified and rapid colorimetric quantitative detection of Fe 3+ with the detection limit of 1.1 μM, which avoids the need of sophisticated instruments and trained operators.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Ruibin Guo,Wei Guo,Hebing Pei,Bingjie Wang,XuDong Guo,Nijuan Liu,Zunli Mo
Chromium (Cr (VI)) is one of the heavy metals that seriously endanger human health and the environment. It is a huge challenge to develop high-efficiency adsorbents with low cost, simple preparation method and green production technique and zero pollution to the environment. In this work, electrospinning technology was used to prepare polyacrylonitrile/polyethyleneimine (PAN/PEI) electrospinning nanofiber membranes (ENM), and then polyacrylonitrile/polyethyleneimine/polypyrrole (PAN/PEI/Ppy) composite nanofiber membrane (CNM) was successfully synthesized by chemical depositing polypyrrole (Ppy) on the surface of PAN/PEI ENM. PAN/PEI ENM provided a larger specific surface area, which facilitated better and more uniform deposition of Ppy on the surface of nanofiber membranes. Scanning electron microscope (SEM) and transmission electron microscope (TEM) images showed that the prepared PAN/PEI/Ppy CNM looked like "balsam pear", and had high adsorption capacity of Cr (VI), with a maximum adsorption capacity of 368 mg g -1 . After five times of adsorption-desorption, the removal of Cr (VI) reached more than 95%. More importantly, compared to the current complex chemical synthesis of Cr (VI) ion adsorbents and secondary pollution to the environment, electrospinning fully demonstrates the huge technical advantages of industrial applications, including high efficiency, simple preparation, and green (no harmful chemical by-products), low cost, no secondary pollution. PAN/PEI/Ppy CNM will be promising solid adsorbent candidates for the removal of Cr (VI) ions in wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）