SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Miao-Miao Jia,Si-Yuan Yang,Ke-Ke Chen,Pan-Pan Zhang,Wei Shao,Zhen Chen,Zi-Meng Xu,Qing-Yun Wu,Yi Li,Ming Xue
Thin-film composite (TFC) reverse osmosis (RO) membranes, fabricated by interfacial polymerization, have achieved significant success in addressing the global water scarcity. Over the past three decades, the camphor sulfonic acid (CSA)/triethylamine (TEA) has been widely used in fabrication of TFC RO membranes. However, the mechanism of this unique formula remains elusive and contentious. In this work, for the first time, deciphering that introducing CSA/TEA into the aqueous phase has negligible impact on the selective polyamide (PA) layer but facilitate the aqueous solution impregnating of porous polysulfone (PSf) support. Specifically, the acidic CSA significantly hinders amine diffusion yet preserves the porosity of the PSf support during high-temperature curing. TEA is essential in modulating the pH changes and balancing the monomer diffusion rate that results from CSA. The COMSOL simulations have further elucidated that the presence of an aqueous solution within the porous support can mitigate the thermal expansion of the PSf, consequently inhibiting the shrinkage of surface pores. The TFC membrane demonstrated a substantial improvement in water permeance due to the preservation of its pore structure. The obtained TFC membrane demonstrated an exceptional NaCl rejection of 99.3 % and a high water flux of 76.8 L m –2 h −1 (2000 ppm NaCl, 15.5 bar), exceeding that of the state-of-the-art TFC RO membranes. Moreover, the RO membrane manifested with long-term stability and good fouling resistance. The mechanistic insights have important implications to more efficient membrane-based desalination and water reuse, thereby reducing energy consumption and minimizing environmental carbon footprint.
研究领域:
材料科学
·
环境工程
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产品关联
DOI
高影响因子
SENSORS
·
2014
·Vol. 14
·期 11
·21453-21465
·
IF 2.048
Zengyuan Pang,Jiapeng Fu,Pengfei Lv,Fenglin Huang,Qufu Wei
Camphor sulfonic acid (CSA)-doped polyamide 6/polyaniline (PA6/PANI) composite nanofibers were fabricated usingin situpolymerization of aniline under different CSA concentrations (0.02, 0.04, 0.06, 0.08 and 0.10 M) with electrospun PA6 nanofibers as templates. The structural, morphological and ammonia sensing properties of the prepared composite nanofibers were studied using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), four-point probe techniques, X-ray diffraction (XRD) and a home-made gas sensing test system. All the results indicated that the CSA concentration had a great influence on the sensing properties of CSA-doped PA6/PANI composite nanofibers. The composite nanofibers doped with 0.02 M CSA showed the best ammonia sensing properties, with a significant sensitivity toward ammonia (NH3) at room temperature, superior to that of the composite nanofibers doped with 0.04–0.10 mol/L CSA. It was found that for high concentrations of CSA, the number of PANI–H+reacted with NH3would not make up a high proportion of all PANI–H+within certain limits. As a result, within a certain range even though higher CSA-doped PA6/PANI nanofibers had better conductivity, their ammonia sensing performance would degrade.Keywords:polyaniline;camphor sulfonic acid;polyamide 6;ammonia;gas sensor
研究领域:
材料科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
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2022
·
IF 5.122
Feifei Lu,Peiyu Tan,Dengfeng Ren,Yuge Han
Poly (aniline) (PANI) is considered an ideal material for the modulation of infrared (IR) radiation due to its excellent electrochromic properties. However, the camphorsulfonic acid doping mechanism which results in emittance modulation is not clearly understood. With the goal of enhancing the IR emittance variation (Δε), a PANI film was synthesized by a chemical oxidation and spraying method, and the doping mechanism of CSA concentration effect on Δε was studied by combining Raman spectra, X-ray photoelectron spectra and density functional theory calculations. The results demonstrate that with increasing camphorsulfonic acid concentration, the effect of the doping concentration on the emittance of PANI/Au films can be divided into two stages: (1) the change in the emittance is mainly caused by the shortening of optical penetration depth either under the state of dopant free (non-doped) or a low CSA doping concentration; (2) the change in emittance is mainly caused by the increase in reflectivity of the PANI layer under the increased doping. Due to the joint action of the two factors, the emittance of the PANI film first increases and then decreases with increasing concentration of CSA, and the maximum Δε (0.45) is realized at 1 M. This paper clarifies the mechanism of PANI films with different CSA dopant concentrations and could provide a way to increase the emittance modulation range by adjusting the concentration of the dopants.
研究领域:
材料科学
·
光学
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DOI
高影响因子
ANALYTICAL CHEMISTRY
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2018
·
IF 6.042
Jiapei Yang,Yin Yu,Datong Wu,Yongxin Tao,Linhong Deng,Yong Kong
Polypyrrole (PPy) was synthesized by a galvanostatic method using (1S)-(+)-10-camphorsulfonic acid ((+)-CSA) as the dopant, and the produced PPy was further overoxidized in a solution of (+)-CSA. A chiral microenvironment was successfully formed in the overoxidized PPy (OPPy) as a result of the synergistic effects of overoxidation and (+)-CSA, resulting in a twisted helical architecture of the OPPy chains. The formation of optically active OPPy was confirmed from aspects of its morphology (SEM and AFM) and circular-dichroism (CD) spectra. Finally, an electrochemical chirality sensor was fabricated on the basis of the resultant OPPy, which exhibited excellent biomolecular homochirality in the discrimination of tryptophan (Trp) enantiomers.
研究领域:
材料科学
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分析化学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Li Jiang,Junaid Ali Syed,Yangzhi Gao,Qiuxiang Zhang,Junfeng Zhao,Hongbin Lu,Xiangkang Meng
Conductive polymer coating doped with large molecular organic acid is an alternative method used to protect stainless steel (SS) bipolar plates in proton exchange membrane fuel cells (PEMFCs). However, it is difficult to select the proper doping acid, which improves the corrosion resistance of the coating without affecting its conductivity. In this study, large spatial molecular group camphorsulfonic acid (CSA) doped polypyrrole (PPY) conductive coating was prepared by galvanostatic electropolymerization on 304SS. The electrochemical properties of the coating were evaluated in 0.1 M H 2 SO 4 solution in order to simulate the PEMFC service environment. The results indicate that the coating increased the corrosion potential and shifted E corr towards more positive value, particularly the j corr value of PPY-CSA coated 304SS was dropped from 97.3 to 0.00187 μA cm −2 . The long-term immersion tests (660 h) show that the PPY-CSA coating exhibits better corrosion resistance in comparison with the small acid (SO 4 2− ) doped PPY-SO 4 2− or PPY/PPY-SO 4 2− coatings. Moreover, the PPY-CSA coating presents low contact resistance and maintains strong corrosion resistance during the prolonged exposure time due to barrier effect and anodic protection.
研究领域:
材料科学
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电化学
·
能源工程
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2017
·
IF 7.504
Serge Ostrovidov,Majid Ebrahimi,Hojae Bae,Hung Kim Nguyen,Sahar Salehi,Sang Bok Kim,Akichika Kumatani,Tomokazu Matsue,Xuetao Shi,Ken Nakajima,Shizu Hidema,Makoto Osanai,Ali Khademhosseini
In this study, composite gelatin–polyaniline (PANI) nanofibers doped with camphorsulfonic acid (CSA) were fabricated by electrospinning and used as substrates to culture C2C12 myoblast cells. We observed enhanced myotube formation on composite gelatin–PANI nanofibers compared to gelatin nanofibers, concomitantly with enhanced myotube maturation. Thus, in myotubes, intracellular organization, colocalization of the dihydropyridine receptor (DHPR) and ryanodine receptor (RyR), expression of genes correlated to the excitation–contraction (E–C) coupling apparatus, calcium transients, and myotube contractibility were increased. Such composite material scaffolds combining topographical and electrically conductive cues may be useful to direct skeletal muscle cell organization and to improve cellular maturation, functionality, and tissue formation.
研究领域:
生物材料
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组织工程
·
肌肉生理学
·
生物医学工程
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DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2019
·
IF 4.978
Li Jiang,Junaid Ali Syed,Guoli Zhang,Yujie Ma,Jun Ma,Hongbin Lu,Xiangkang Meng
The enhanced corrosion resistance with sustained conductivity are the prerequisites of stainless steel bipolar plates for practical application in proton exchange membrane fuel cell. Herein, we prepare a conductive polypyrrole-graphene oxide/polypyrrole-camphorsulfonic acid bilayer composite coating (PPY-GO/PPY-CSA) on 304 stainless steel bipolar plate by electrodeposition method. The electrochemical tests are conducted in the simulated bipolar plates working environment, the potentiostatic polarization results imply that the PPY-GO/PPY-CSA composite coating offers stable corrosion resistance with low potentiostatic corrosion current density in comparison with the PPY-GO coating. The corresponding electrochemical impedance spectroscopy measurements reveal that the PPY-GO/PPY-CSA composite coating exhibits satisfactory conductivity and displays sustained anodic protection effect with superior anticorrosion performance during the 696 h of immersion. The excellent corrosion protection ability of the PPY-GO/PPY-CSA composite coating owing to its good adhesion strength, compact structure, satisfactory conductivity as well as the synergetic interaction between the two layers of the coating.
研究领域:
材料科学
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电化学
·
能源工程
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DOI
高影响因子
APPLIED CLAY SCIENCE
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2022
·
IF 5.907
Tianqi Yuan,Miao Chen,Xiaotong Sun,Jianping Guan,Fawei Zhu,Kai Tang,Zhipeng Zhang,Qi Liu,Xiaoqing Chen
Designing chiral adsorption separation material with high enantioselectivity and stability is a promising route to realize the enantioselective recognition and separation of racemic molecules. Here, for the first time, camphor sulfonic acid derivatives (CSA) were synthesized as a chiral resolving agent, and it was modified on Mg/Al layered double hydroxide (Mg/Al-LDH) through electrostatic self-assembly to construct functionalized chiral adsorption separation material (CSA@LDH), which could be served as an adsorbent for enantioselective recognition and separation of propranolol enantiomers ( R,S -PRO). The CSA@LDH maintained the advantage of limited chiral space in layered structures to achieve the selective enrichment of R -PRO, and the e.e. % value of single separation could reach 19.5%. Meanwhile, density functional theory (DFT) calculations supported that chiral recognition and separation were ascribed to the discrepancy in affinities stemming from the difference of π-π interaction force and hydrogen bonding capacity of CSA with R,S -PRO. Hence, considering the superior ability of hydrogen bond coordination and stereocontrol of camphor sulfonic acid derivatives, it is expected to be more widely used as a chiral resolving agent for other enantiomeric recognition and separation.
研究领域:
化学
·
材料科学
·
药物化学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 11
·5034-5042
·
IF 3.925
Fubin Fu,Xueyan Zhang,Shengquan Zhou,Wei Shi,Jiangmin Li,Jiajia Yu,Yanzhao Rao,Lei Wu,Jing Cao
In this work, we designed two non-salen coumarin Schiff base chiral fluorescent probes 3,3′-((1E,1′E)-(((1,2)-cyclohexane-1,2-diyl)bis(azaneylylidene))bis(methaneylylidene))bis(7-methoxy-2H-chromen-2-one) (L1) and 3,3′-((1E,1′E)-(((1,2)-cyclohexane-1,2-diyl)bis(azaneylylidene))bis-(methaneylylidene))bis(2H-chromen-2-one) (L2), which have outstanding circular dichroic CD signals but almost show no circularly polarized luminescence (CPL) signals. By adding metal ions that can effectively inhibit photo-induced electron transfer (PET), it was observed that L1 can be used as a highly sensitive dual detection ion probe for Mg2+ and Zn2+ as Mg2+ and Zn2+ can turn on the CPL emission of L1. Moreover, (S,S)-L1 has exquisite recognition ability for the enantiomer of the chiral drug D/L-camphorsulfonate and showed reversible fluorescence “on/off” response with Zn2+ and EDTA. It was also found that L2 manifested selective recognition ability for Zn2+.
研究领域:
化学
·
分析化学
·
光学
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DOI
高影响因子
Membranes
·
2025
·Vol. 15
·期 12
·374
·
IF 3.6
Yujie Guo,Bo Pang,Fujun Cui,Tingxu Fang,Li Tian,Liu Yang,Zeyu Chen,Xuemei Wu
The design of the chemical structure of ion-conductive membranes is critical to enhance proton/vanadium ion selectivity and the performance of vanadium redox flow batteries (VRFBs). Herein, camphorsulfonic acid is proposed as a novel proton-conductive group and grafted on polybenzimidazole (PBICa). The pendant sulfonic acid group on the end of the grafted side chains is flexible to promote the aggregation of ionic clusters at even a relatively low ion-exchange capacity (IEC) of 2.14 mmol g −1 . The formation of these high-quality clusters underscores the remarkable efficacy of this structural strategy in driving nanoscale phase separation, which is a prerequisite for creating efficient proton-conducting pathways. The bulky and non-coplanar architecture of the camphorsulfonic acid group helps to increase the proportion of free volume compared with the conventional sulfonated polybenzimidazole, which not only promotes water uptake to facilitate proton transport but also exerts a sieving effect to effectively block vanadium ion permeation. The well-formed ionic clusters, together with the expanded free volume architecture, endow the membrane with both high proton conductivity (30.5 mS cm −1 ) and low vanadium ion permeability (0.15 × 10 −7 cm 2 s −1 ), achieving excellent proton/vanadium ion selectivity of 9.85 × 10 9 mS s cm −3 , which is about 5.6-fold that of a Nafion 212 membrane. Operating at 200 mA cm −2 , the PBICa-based VRFB achieves an energy efficiency of 78.4% and a discharge capacity decay rate of 0.32% per cycle, outperforming the Nafion 212-based battery (EE of 76.9%, capacity decay of 0.79% per cycle).
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
·
2022
·
IF 3.571
Chengchen Zhang,Xiaofei Ma
This work presents a synergistic system for enantioseparation in capillary electrophoresis (CE) with a chiral ionic liquid (CIL) based on D-10-camphorsulfonic acid as additive and carboxymethyl-β-cyclodextrin (CM-β-CD) as the chiral selector. The proposed method showed excellent enantioseparation performance towards sixteen chiral drugs. In contrast to the single CM-β-CD system, the notably improved resolution (Rs) and selectivity factor (α) of model drugs were observed in synergistic system. Several key parameters such as CIL concentration, CM-β-CD concentration, buffer pH and separation voltage were investigated, after which Statistical Product and Service Solutions (SPSS) was used to prove the potential synergistic effect. The nuclear magnetic resonance (NMR) results further demonstrated the function of the CIL and the superiority of synergistic system. Finally, chiral impurity determination of chlorpheniramine maleate sample was successfully carried out using the established method.
研究领域:
分析化学
·
药学
·
色谱学
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产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2019
·Vol. 10
·期 1
·1-8
·
IF 11.878
Wang Yang,Wu Niannian,Wang Yan,Ma Huan,Zhang Junxiang,Xu Lili,Albolkany Mohamed K.,Liu Bo
Precise control of interlayer spacing and functionality is crucial in two-dimensional material based membrane separation technology. Here we show anion intercalation in protonated graphite phase carbon nitride (GCN) that tunes the interlayer spacing and functions of GCN-based membranes for selective permeation in aqueous/organic solutions. Sulfate anion intercalation leads to a crystalline and amphipathic membrane with an accessible interlayer spacing at ~10.8 Å, which allows high solvent permeability and sieves out the solutes with sizes larger than the spacing. We further extend the concept and illustrate the example of GCN-based chiral membrane via incorporating (1R)-(-)-10-camphorsulfonic anion into protonated GCN layers. The membrane exhibits a molecular weight cutoff around 150 among various enantiomers and highly enantioselective permeation towards limonene racemate with an enantiomeric excess value of 89%. This work paves a feasible way to achieve water purification and chiral separation technologies using decorated laminated membranes.
研究领域:
材料科学
·
化学工程
·
分离技术
·
纳米技术
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DOI
高影响因子
危险品化学品经营许可证（带存储）