TALANTA
·
2022
·
IF 6.556
Zhi-Heng Pan,Shi-Song Yu,Chen-Chen Bai,Wen-Yu Yin,Yi-Rong Ma,Zi-Ang Xue,Qin-Yue Lu,Lin-Yi Dong,Xian-Hua Wang
Molecularly imprinted polymers (MIPs) are artificial chemical receptors, and can recognize template molecules with a high selectivity and affinity. As “antibody mimics”, MIPs have been widely studied in various fields. However, the general applicability of MIPs is limited by the type of functional monomers . Herein, we developed caffeic acid (CA, a natural polyphenol) as novel a functional monomer. An innovative poly(caffeic acid)-coated molecularly imprinted magnetic nanoparticles (PCA-MIMN) with transferrin (TRF) as a model glycoprotein template was fabricated by autoxidation of CA with hexamethylenediamine (HMDA) in an aerobic environment as imprinted layer. The successful fabrication of PCA-MIMN was proved in detail by diversified characterization. The PCA-MIMN exhibited not only outstanding binding affinity and specificity for target glycoprotein, but also excellent hydrophilicity due to the externally generous hydrophilic groups. To evaluate the preeminent performance, the PCA-MIMN was linked with pH-triggered allochroic-graphene oxide (AGO), which was used for determination of TRF in real samples. The proposed PCA-MIMN linked AGO strategy exhibited ultrahigh sensitivity with limit of detection of 0.38 pg mL −1 for TRF. Finally, the proposed strategy was successfully applied in determination of TRF in spiked human serum sample with recovery and relative standard deviation in the range of 97.2%–103.9% and 4.6%–5.8%, respectively. This work demonstrates that the “autoxidation of CA with HMDA” may be a universal tool for synthesis of highly specific MIPs, and the type of functional monomers will increase exponentially due to the presence of numerous polyphenols in nature.
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高影响因子
RSC Advances
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2022
·Vol. 12
·期 8
·4550-4561
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IF 4.036
Yun Liu,Haihua Yang,Tao Chen
It is highly desirable to explore efficient catalysts for reducing toxic Cr6+ to benign Cr3+ under mild and eco-friendly conditions. This article describes a facile fabrication of nitrogen doped carbon (N@C-g-C3N4) as a metal-free catalyst for Cr6+ reduction using lignin as a carbon source and g-C3N4 nanosheets as a nitrogen source. The structural properties of the N@C-g-C3N4 catalyst are characterized by TEM, HR-TEM, XRD, TGA, Raman, EDS-mapping, XPS and BET techniques. The summation of these analyses sheds light on the high surface area (903 m2 g−1), mesopore size (17.3 nm) and defects (ID/IG = 0.97) of N@C-g-C3N4, which contribute to its excellent catalytic activity in HCOOH-mediated reduction of Cr6+ to Cr3+ with high rate constant (2.98 min−1) and turnover frequency (2.21 molK2Cr2O7 gcatalyst−1 min−1) and complete degradation (100%) within 5 min. The catalytic performance of the catalyst reveals that the reduction activity is significantly dependent on the concentration of Cr6+ and HCOOH, catalyst loading, pH, temperature, and foreign ions. Particularly, the N@C-g-C3N4 catalyst shows superior stability and renewability with little loss of activity (≥95%) after 8 months storage and five repeated uses. Furthermore, N@C-g-C3N4 can be applied in other hydrogenation reactions involving K3[Fe(CN)6], 4-NP and BPA using NaBH4 as a hydrogen donor, and the removal of organic dyes. These findings illustrate that N@C-g-C3N4 as a metal-free catalyst is effective, versatile and eco-friendly for the reduction of Cr6+ from contaminated environments.
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高影响因子
FUEL
·
2022
·
IF 8.035
Yundi Huang,Fashe Li,Guirong Bao,Qingtai Xiao,Hua Wang
Biodiesel is a promising renewable energy the use of which facilitates the goals of carbon neutrality and timely carbon peak. The iodine value (IV), one of the major properties of biodiesel , denotes the degree of unsaturation and correlates with the chemical composition of biodiesel. In this work, a novel approach based on random forest (RF) and least squares support vector machine (LSSVM) algorithms optimized by whale optimization algorithm (WOA) is proposed for estimating the IV of biodiesel as a function of fatty acid methyl ester profiles. In doing so, the compositions and IVs of 52 biodiesel/binary biodiesel blends were determined by gas chromatography mass spectrometry and EN14111 standard. Then, LSSVM algorithm was assessed as the most appropriate predictive method compared to the adaptive neuro fuzzy inference system, multi-layer perceptron neural network, and decision tree algorithms. Continuously, four feature selection approaches (Pearson’s correlation coefficient, principal component analysis, ReliefF algorithm, and RF) were utilized to choose the most influencing fatty acid methyl ester combination as input. The RF-LSSVM model was found to be superior to other Ⅰ hybrid models. Then, WOA was incorporated into the modeling process and the RF-WOA-LSSVM model achieved a high performance with a root mean square error and correlation coefficient of 1.1893 and 0.9977, respectively. The accuracy and error of the RF-WOA-LSSVM model have been validated. Comparison with previous biodiesel IV machine learning models and application of other new experimental datasets from the literature prove the feasibility of the proposed hybrid RF-WOA-LSSVM model for estimating the IV of different biodiesels types.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Guifang Wang,Guangchuan Liang,Huizhen Xiao,Jun Qiu,Haiyan Liu,Shaojian Ma,Sridhar Komarneni
The conventional environmental remediation materials, which are applied for the long-term treatment of mine tailings are easy to fail when affected by acid rain. Therefore, dynamic column simulation experiments were conducted to compare the immobilization persistence of As, Mn, Pb and Zn by the addition of triethylenetetramine modified montmorillonite (TTA-Mt) and calcium-based montmorillonite (Ca-Mt) in sulfide tailings during a simulated 5-year study of acid rain leaching. The structural and morphological characteristics of TTA-Mt were analyzed with FTIR, XRD, SEM, TEM and EDS. Results showed that the additions of TTA-Mt could persistently immobilize the heavy metal ions while Ca-Mt additions had little effect. After long-term simulated leaching for 5 years, TTA-Mt still had superior environmental stability for Zn and As with the immobilization rates of 96% and 86%, and the leaching amounts of Mn and Pb were less than 4.23 and 0.66 mg/kg, respectively. Morphology and chemical fraction analyses confirmed that the immobilization was mainly due to the formation of relatively stable phases by complexation and precipitation. Results presented here demonstrated the significant potential of TTA-Mt for long-term immobilization of heavy metals in tailings against acid rain and thus could provide guidance for remediation of tailings.
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高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Lei Zhang,Xuexiu Jia,Yusen Ai,Renliang Huang,Wei Qi,Zhimin He,Jiří Jaromír Klemeš,Rongxin Su
Cellulose nanocrystals (CNCs) are usually prepared by sulphuric acid hydrolysis in industrial production, resulting in a large amount of alkaline and water consumption. In this paper, three acid-CNCs separation methods, including gravity settling, centrifugation and microfiltration , are used to directly separate sulphuric acid from hydrolysate mixture to reduce alkaline and water consumption. Microfiltration was selected as the best method for acid-CNCs separation. Using microfiltration, the highest sulphuric acid recovery ratio was about 65.0%, with an acid concentration range of 8–10 wt% in the pilot-scale CNCs production. Continuous centrifugation was introduced to replace gravity settling to separate CNCs from the neutralised mixture for faster production and reducing water consumption. The consumption of alkaline and water decreased by 63.0% and 68.0%, and the cost was reduced by 26%. The result of life cycle assessment (LCA) showed that the process with acid-CNCs separation using microfiltration achieved a reduction of 33.4% in aquatic ecotoxicity, 38.1% in terrestrial ecotoxicity , 47.9% in aquatic acidification, 55.8% in aquatic eutrophication , 40.0% in global warming potential and 47.8% in non-renewable energy consumptions. This study provided a promising approach for separating sulphuric acid from hydrolysate mixture and reducing consumption of alkaline and water. Such clean and economic process has great potential in the industrial production of CNCs.
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高影响因子
DESALINATION
·
2022
·
IF 11.211
Shiqiang Liang,Jinghui Wu,Chi Wang,Xiaoxuan Zhao,Chuang Wang,Xia Yang,Hongliang Huo,Tong Wang,Zhi Geng,Xianze Wang
The emerging self-supporting symmetric membrane has shown great promise in the field of forward osmosis (FO) separation due to the elimination of internal concentration polarization (ICP). The selective permeability and mechanical properties of membrane materials are the keys to determining the comprehensive properties of such ultra-thin membranes. In this study, a series of carboxylated poly (aryl ether sulfone) (PAES-COOH) materials were designed and synthesized for the fabrication of high performance self-supporting symmetric FO membranes. Owing to the superior character of polymer materials and the introduction of hydrophilic charged carboxylic groups in their molecular structure, these prepared self-supporting symmetric FO membranes with a thickness of ~2.5 μm exhibited excellent mechanical robustness and outstanding permselectivity , so that they could maintain structural integrity and show a high water/salt selectivity in the process of long-term forward osmosis separation. The series of fabricated PAES-COOH membranes displayed the Young's modulus surpass 1.76 GPa, the tensile strength exceed 72.6 MPa, and the elongation at break overtop 70.2%. Additionally, the optimal PAES-COOH-80 membrane sample demonstrated a remarkable H 2 O/Na 2 SO 4 selectivity of 1673.8 L mol −1 . This study provides an effective strategy for conveniently fabricating high-performance self-supporting symmetric FO membrane.
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高影响因子
JOURNAL OF POWER SOURCES
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2022
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IF 9.794
Yan Yin,Mengyuan Li,Xin Liu,Na Xie,Chenyang Zheng,Guokun Liu,Shuoyao Yin,Xintian Li,Yabiao Pei,Junfeng Zhang,Yanzhou Qin,Michael D. Guiver
Proton exchange membranes (PEMs) exhibit reduced proton conductivity caused by severe dehydration under low relative humidity (RH), which is a pivotal bottleneck toward widespread commercialization of PEM fuel cells (PEMFCs). Previous PEM optimizing strategies have predominantly pursued increasing water uptake or enlarging hydrophilic domains, for which there is less focus on the mode of proton transport (Grotthuss or vehicular mechanisms) as the underlying reason. Here, a counterintuitive route is proposed by incorporating Cu II [Fe III (CN) 6 ] 2/3 Prussian blue analogue (CuFe-PBA) additive, which possesses a hydrophobic framework. However, due to the ideal lattice length of CuFe-PBA, the lattice water molecules contained within this framework form well-connected hydrogen bond networks, which promote Grotthuss-type proton transport that is less dependent on RH conditions. Consequently, CuFe-PBA doped in sulfonated polysulfone (SPSf) matrix yields SPSf/CuFe-PBA composite PEMs showing better performance over unfilled PEM in both ex situ and in situ evaluations, especially under low RH conditions, which are competitive with Nafion 212. Preliminary trials of scale-up for CuFe-PBA and composite PEMs with cost estimation, and feasibility of incorporating polytetrafluoroethylene reinforcement, suggest economic and practical potential. Thus, CuFe-PBA composite PEMs may be of particular interest to PEMFC and related materials communities.
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高影响因子
FOOD RESEARCH INTERNATIONAL
·
2022
·
IF 7.425
Qingqing Yu,Zhiyu Xiong,Tong Shi,Li Yuan,Yulong Bao,Ruichang Gao
In order to elucidate the gelling mechanism of Premna microphylla turcz (PMT) induced by plant ash (PA), PA was fractionated into supernatant (PA-S) and precipitation (PA-P) and added to the PMT suspension, respectively. The effects of different concentrations (1–9%) and fractions (PA, PA-S, PA-P) of PA suspension on the gel properties were studied. Results showed that the electrical conductivity, content of monovalent cations, pH were higher in PA-S than PA-P. Both the PA-S and PA-P fractions induced the gelation of PMT (except for the low concentration at 1% for PA-S), and the PA-P-PMT gels showed much higher gel strength and hardness than PA-S-PMT gels. With increased concentration, the gel strength increased in PA-P-PMT, but decreased in PA-S-PMT. A hypothesis for the gelation of PMT induced by PA was proposed: the divalent cations in PA bind to carboxyl group in pectin and form gels; when higher content of PA is added, a higher pH leads to extensive dissociation of carboxyl groups thereby increases the electrostatic repulsion between pectin chains, which ultimately weakens the gelling forces. This study can provide theoretical support for further optimization of the traditional processing of PMT gels.
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高影响因子
Additive Manufacturing
·
2022
·
IF 11.632
Qinfei Xu,Wenhan Xu,Yang Yang,Xin Yin,Chenyi Zhou,Jinxuan Han,Xuefeng Li,Yingshuang Shang,Haibo Zhang
3D printed poly (ether ether ketone) (PEEK) parts have attracted considerable attention in the automotive, medical, and aerospace fields in the past two decades. However, the major obstacle to its further application is weak interlayer strength and severe mechanical anisotropy. Herein, amorphous poly (aryl ether ketone) (aPAEK) was designed as an interlayer reinforcement modifier to strengthen the interlayer strength and reduce mechanical anisotropy of 3D printed PEEK parts. By introducing 7 wt% aPAEK in PEEK filaments, the interlayer strength in 3D printed parts increased 130% from pristine PEEK to aPAEK/PEEK blends. The mechanical anisotropy in the XY plane was reduced to 1.1%, and its X-axis and Y-axis tensile strength still reached 89.2 ± 3.3 MPa and 88.1 ± 4.1 MPa, respectively. We demonstrate that these performance enhancements were due to the diffusion and entanglement of aPAEK between the layers. These remarkable results significantly improve the comprehensive mechanical properties of 3D printed PEEK parts, and expand its high-performance applications. This work also yields new insight into the development strategy of additive manufacturing materials by blending.
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高影响因子
PHYSICS OF FLUIDS
·
2022
·Vol. 34
·期 3
·
IF 4.98
Yuan Shuai,Zhou Mingyong,Peng Tao,Li Qiang,Jiang Fengze
Achieving rapid mixing of different liquids in a short distance is important in various biochemical applications. Herein, a novel planar mixer with staggered Z-shaped baffles is proposed. Numerical investigations are carried out to evaluate its mixing ability based on mixing quality and pressure drop when the Reynolds number (Re) varies from 0.1 to 50. The Lyapunov exponent, the Poincaré map, and the vortex visualization are conducted to comprehensively analyze the chaotic state and the mixing mechanism. Results show that the proposed mixer exceeds 0.9 mixing efficiency when 0.1 ≤ Re and Re ≥ 8. As Re ≥ 8, different vortex patterns appear by changing the inlet configuration. The disturbance for fluids induced by a vortex on the mass transfer surface is not only dependent on its intensity but also related to the position of the vortex/vortex leg. The proposed planar mixer, inducing a single vortex or vortex pair with different directions, presents different mixing performance when the Re varies from 8 to 50, from which the approach of the rotating vortex that can mainly improve the mixing quality is found. This well explains the chaotic mixing behavior observed in the planar mixer with Z-shaped baffles, which to date has not been studied before. Furthermore, the micromixer is fabricated, tested, and applied for luminol–peroxide chemiluminescence detection to characterize its performance.
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高影响因子
MACROMOLECULES
·
2022
·
IF 6.057
Kang Liu,Pengbo Han,Shunfeng Yu,Xinjun Wu,Yueyi Tian,Qianhan Liu,Jinhui Wang,Mingming Zhang,Chuanzhuang Zhao
Stimuli-responsive light-emitting polymers (SRLEPs) have many promising applications. However, the synthesis of SRLEPs from nonconjugated and water-soluble monomers remains a challenge. Herein, for the first time, nonconjugated luminescent polymers with an upper critical solution temperature (UCST) in aqueous solution are reported. The polymer is synthesized through copolymerization of a strong hydrogen-donating monomer, acrylic acid (AAc), and a strong hydrogen-accepting monomer, N-vinylcaprolactam (NVCL). The polymer–polymer hydrogen-bonding rigidifies the chain conformation and enhances the clustering of the heteroatoms and carbonyl groups, resulting in an improved clusteroluminescence. Meanwhile, the polymer–polymer hydrogen bonding also brings in dynamic chain association that can be switched with temperature, yielding a UCST-type thermoresponsiveness in aqueous solution. This work demonstrates a novel and facile method of designing SRLEPs through tailoring the hydrogen bonds in the polymer. The properties of clusteroluminescence and thermoresponsiveness of the AAc–NVCL copolymers may render themselves with applications as temperature-sensitive biosensing.
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CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Shengda Wang,Hanqing Jiang,Ronghua Yu,Shenghui Lou,Li Ma,Jie Liu,Tao Tang
A series of epoxy resins containing aromatic imine are synthesized via the Duff reaction by using various bisphenols, which show significantly reduced heat release capacity (HRC) and total heat release (THR) after curing. Compared to diglycidyl ether bisphenol A/4,4-diaminodiphenyl methane (DGEBA/DDM), the HRC and THR of phenolphthalein-based epoxy resin containing aromatic imine/DDM (BPP-E/DDM) are reduced by 87% (464 J/g K vs 58 J/g K) and 62% (30.2 kJ/g vs 11.4 kJ/g), respectively. Furthermore, the BPP-E/DDM exhibits a UL-94 V-0 rating (1.6 mm) and a limiting oxygen index of 48% (3.2 mm). Compared to DGEBA/DDM in the cone calorimeter test, the peak heat release rate, THR, peak smoke produce rate, and total smoke production of BPP-E/DDM were reduced by 91% (1006 kW/m2vs 87 kW/m2), 51% (89 MJ/m2vs 44 MJ/m2), 89% (0.36 m2/s vs 0.09 m2/s), and 79% (38 m2vs 8 m2), respectively. The influences of aromatic imine and the chemical structures between two benzene rings in the bisphenols on HRC and THR of the resultant epoxy thermosets are investigated. The mechanism studies show that the presence of aromatic imine in the epoxy resins completely changes the decomposition process to generate the products containing aromatic N-heterocycle, which contributes greatly to the improved char-forming ability and flame retardancy. Meanwhile the thermosets bearing carbonyl, 3-phthalidylene, and sulfonyl between two benzene rings in the bisphenols show better char-forming ability and flame retardancy among the resultant epoxy resins containing aromatic imine, due to more polycyclic aromatic hydrocarbons produced in the condensed phase.
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危险品化学品经营许可证（带存储）