RSC Advances
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2017
·Vol. 7
·期 12
·6800-6808
·
IF 3.108
Haibo Liu,Ning Gan,Yinji Chen,Tianhua Li,Yuting Cao
In this study, a novel three dimensional (3D) M × N type aptamer-functionalized solid-phase micro extraction (SPME) fibers array (M represents the number of targets; N represents the number of samples) was developed for selective enrichment of multiplex antibiotic residues from milk samples, with three chloramphenicols (CAPs) as models. First, gold nanoparticles (AuNPs) were electrodeposited on a gold wire (Φ = 0.2 mm), which was wound around a conductive indium tin oxide (ITO) glassy fiber. Then, the fiber was immersed into thiol-functionalized aptamer solution, which could specifically recognize three CAPs, including chloramphenicol (CAP), thiamphenicol (TAP) and florfenicol (FF). The aptamer can be covalently immobilized on AuNPs through Au–S bonds. Thus, a 3D aptamer-functionalized fiber interface (3D-Apt@AuNPs@Au wire–ITO) was built and employed for specifically sorptive extraction of CAPs from the milk samples with a matrix complex based on the high affinity of the aptamer for the targets. The extraction capacities for CAP, TAP and FF were 887, 840 and 801 ng per fiber, respectively. The enrichment folds were more than 500 times, which is 3.1 folds higher than that of the 2D-Apt@AuNPs–ITO fiber and 6.6 folds higher than that of the 1D-Apt@Au wire–ITO fiber. Afterwards, several similar fibers were assembled together into an array for simultaneous enrichment of three CAPs from 12 samples in one run. Finally, the adsorbed targets were washed away using a pH 8.5 0.1 M Tris–HCl buffer and then detected by high performance liquid chromatography (HPLC)-Diode Array Detector (DAD). The parameters, including extraction temperature, shuttle rates, extraction and desorption pH, and extraction and desorption time, were investigated and discussed. Under the optimized conditions, the limits of detection (LOD) and quantitation (LOQ) were determined as 0.262–0.293 and 0.864–0.967 ng mL−1, respectively, for several CAPs. The fibers array can be applied in replicate batch-extraction for at least 60 extraction cycles with a recovery of over 80%. The SPME fibers assay coupled with HPLC detection possessed advantages of high-throughput, high selectivity and adsorption capacity in one run. Furthermore, the process is environmentally friendly without using organic solutions during the entire extraction process. Thus, the method is a universal platform that can be extended to the selective extraction of other organic pollutant residues if the modified aptamers are changed.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Hui Lu,Hongbo Wang,Changfei Gao,Lifen Liu,Tingting Yu,Yihua Li,Shaoying Lin
Lanthanum and cerium are widely used as important raw materials for energy storage batteries due to excellent natural electrical, magnetic, and optical properties. However, with the explosive growth of new energy generation and the environmental degradation-resistant of lanthanum and cerium, it is difficult to balance environmental sustainability and resource scarcity to achieve lanthanum-cerium removal by conventional chelate salt precipitation. Herein, a laboratory-scale self-powered electro-membrane bioreactor (SPEMBR), integrating high-active nitrogen-doped carbon nanotube-loaded iron and molybdenum bimetallic conductive composite electrode membrane (M−N−CNTs@Fe/Mo) by hydrothermal and phase inversion processes was successfully constructed and evaluated for removing lanthanum cerium from industrial wastewater. The prepared bi-functional M−N−CNTs@Fe/Mo5% electrode membrane exhibited a uniform morphology and excellent hydrophilicity, with nano pore lattice spacing only 0.2637 nm. Electrochemical test results demonstrated that the novel electrode indicated excellent redox properties (i 0 = 8.35 × 10 −3 A cm −2 , C dl = 1.13 mF cm −2 ) and efficient electron transfer efficiency (R ct = 4.69 Ω, n = 3.9). Based on optimized conditions (5)% doping ratio, pH = 10, C = 20 mg/L), the SPEMBR assisted by M−N−CNTs@Fe/Mo catalytic electrode membrane achieved approximately complete removal efficiency of lanthanum and cerium (>99.2 %), superior to most publicly available related studies (86.3 %-99.0 %), but with a calculation cost of only $8.54. Identification of membrane interface products and system precipitates demonstrated that the outstanding removal efficiency was attributed to the combined reaction mechanism of electroreduction, electrocoagulation and electromembrane filtration. This work provides a bright application prospect for low-cost and effective removal of lanthanum cerium metal based on electrode membranes.
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JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Yufeng Liang,Ziqiang Liu,Kejing Lin,Weimin Yin,Yuanqin Zhu
Aromatic hydrocarbon proton exchange membranes (PEMs) hold promises as alternatives to Nafion membranes. Here we report on the design and preparation of graft-type PEMs based on poly ( m -terphenyl fluorenyl)s (TSPHFTP-x) with a featured structure of rigid all-carbon aromatic backbones and long flexible side chains with dual 1,2,3-triazole and disulfonated units. Benefiting from the well-designed structure, the TSPHFTP-x membranes exhibit a well-defined bicontinuous microphase separation structure, thus achieving high proton conductivities up to 175.6 mS cm −1 (25 °C) and 303.0 mS cm −1 (80 °C) under 100 % relative humidity, and excellent dimensional stability with swelling ratio below 24 %. Meanwhile, these membranes show good oxidative stability and mechanical properties. In addition, the H 2 –O 2 fuel cell assembled with the TSPHFTP-50 PEM shows a peak power density of 1013 mW cm −2 at 60 °C. This study provides a valuable insight into the design of polymer architectures for high-performance hydrocarbon PEMs.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Lizhe Ma,Zhihong Zhang,Jieli Duan,Jin Li,Qingyuan Lin,Yinlong Jiang,Kefu Zhu,Zhiyong Fang,Bang Ji,Zhou Yang
Catalyst performance is traditionally evaluated under high light intensity, where variations in e - -h + pair recombination rates at different light intensities may limit the applicability of the selected catalyst to diverse light sources. Response surface methodology (RSM) was employed to compare catalyst performance under two optimization processes, using tetracycline degradation rate and photon flux as response variables. The m-TiO 2 @CdS catalyst was characterized by XRD, SEM, TEM, XPS, and UV-Vis-DRS, and its preparation process was optimized using RSM, with precursor ratio, hydrothermal time, and temperature as variables. The proposed optimization model for tetracycline degradation rate and photon flux exhibited a strong correlation between predicted and experimental results. The tetracycline degradation rates for the two optimized preparation processes were nearly identical, at 61.87 % and 61.18 %, respectively. A comparison of tetracycline degradation kinetics under different light conditions (light saturation and non-saturation) for the two optimized m-TiO 2 @CdS samples demonstrated that the photon flux-based optimization model offered greater adaptability across a wider range of light intensities. Additionally, the repeatability of m-TiO 2 @CdS prepared under the optimal conditions was assessed, and a plausible mechanism for its photocatalytic degradation of tetracycline was proposed.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 23
·46354
·
IF 1.901
Bing Chen,Tingting Li,Zheng Zhang,Sui Wang,Zhiyong Guo,Yufang Hu
A promising strategy to design crosslinked photoluminescent hydrogel (PL hydrogel) is to synthesize the covalently bonded polymer chains by thermal polymerization. A proper ratio of methacrylic acid and m -phenylenediamine was used to prepare the PL hydrogel, and doping with graphene oxide and carboxymethyl chitosan improves the structure of the gel. The green and efficient hydrothermal synthesis realized a high polymerization and a short reaction time. Meanwhile, a series of properties were investigated for several combinations of hydrogels. Ultraviolet spectra, fluorescence spectra, and particle size distributions were used to characterize the PL composites. Scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis, rheological studies, and stress–strain tests were conducted to characterize the morphology, structure, and performance of the compound hydrogel. The adsorption properties of the PL hydrogel were characterized in adsorption tests. The results indicated that the PL hydrogel exhibited a favorable luminescence property, a certain degree of mechanical strength, and good adsorption performance. The prepared PL hydrogel has potential applications in adsorption and visual detection. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46354.
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CANADIAN JOURNAL OF CHEMICAL ENGINEERING
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2017
·Vol. 96
·期 8
·1814-1819
·
IF 1.356
Quanming Lyu,Wenbo Zhang,Weizhen Sun,Zhimei Xu,Ling Zhao
The solubilities of m-toluic acid (m-TA) from 313.2 to 383.2 K, as well as those of isophthalic acid (IPA) from 373.2 to 463.2 K in water, ethanoic acid, and their mixtures were measured by the steady-state method. The modified Apelblat equation was used to correlate the experimental solubilities of m-TA, as well as those of IPA. The F-test shows that the modified Apelblat equation is suitable to model the solubilities of m-TA and IPA, respectively. Based on the determined solubility data, the thermodynamic parameters including the apparent molar enthalpy and entropy concerning solute dissolution were further calculated. We hope that the solubility data and related thermodynamic parameters can provide valuable insights into the design and optimization of the industrial manufacture of IPA.
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LANGMUIR
·
2024
·
IF 3.7
Qiang Wang,Zhihao Shen,Qiuxia Wang,Chuanqi Li,Haidong Jia,Han Sun,Pingan Pei,Chang Shan,Liangyu Wu,Yifan Luo,Han Jia,Pan Huang
Great aqueous dispersibility, a large specific surface area, and high impermeability make graphene oxide (GO) the ideal candidate for a high-performance corrosion inhibitor. Numerous symmetrical modification methods have been reported to enhance the adsorption of GO on metal surfaces in various corrosive media. This work aims to investigate the enhancement and mechanism of unilateral hydrophobic modification on the corrosion inhibition performance of GO. In this study, amphiphilic Janus GO (JGO) was prepared by grafting hydrophobic alkyl chains on one side of GO, and its anticorrosion performance was evaluated via weight loss experiments and electrochemical tests. The results revealed that the corrosion inhibition efficiency for Q235 mild steel (MS) in a 1 M HCl aqueous solution of 25 ppm JGO (81.08%) was much higher than that of GO at the same concentration (22.12%). Furthermore, the Langmuir adsorption isotherm and computational study demonstrated that the synergistic effect of physical adsorption and chemical adsorption promoted the hydrophilic side of JGO close to the surface of the metal, and the dense protective layer was formed by the hydrophobic chains toward the corrosive medium, which effectively hindered the corrosion of MS by the acidic liquid. This study emphasizes the significant role of asymmetrically modified hydrophobic alkyl chains in improving the corrosion prevention performance of GO and provides a perspective for the structural design of GO-based corrosion inhibitors.
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PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2012
·
IF 1.693
Baimei Yang,Hui Wan,Guofeng Guan
Isobaric vapor–liquid equilibrium (VLE) data are reported for binary mixtures of methyl formate + o-xylene, methyl formate + m-xylene, methyl formate + p-xylene, and methyl formate + ethylbenzene at 101.33 kPa. The data are obtained using a vapor recirculating type (modified Othmer's) equilibrium still. All of the binary systems show positive deviation from ideality. None of the systems form an azeotrope. The VLE data for these binary systems are checked to meet rigorous thermodynamic consistency by the Herington method and the point-to-point test of the Fredenslund method. The experimental VLE data are well-correlated by the nonrandom two-liquid (NRTL), universal quasichemical activity coefficient (UNIQUAC), and Wilson equations.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Chunyang Zhang,Yifan Wang,Zexiong Wang,Shilong Zhao,Ruoshan Lei,Shiqing Xu
The development of ultrasensitive thermometric phosphors has become an active area of research due to their appealing applications in the contactless temperature detection field. Herein, the scheelite-related compounds—CaGd 2 (WO 4 ) 4 : Nd 3+ , Yb 3+ and CaGd 2 (MoO 4 ) 4 : Nd 3+ , Yb 3+ , which exhibit high sensing capacity—are successfully prepared and systematically characterized. The X-ray diffraction analysis reveals that CaGd 2 (WO 4 ) 4 : Nd 3+ , Yb 3+ exhibits the monoclinic structure, whereas CaGd 2 (MoO 4 ) 4 : Nd 3+ , Yb 3+ is in the tetragonal phase. The maximum phonon cut-off energy of CaGd 2 (WO 4 ) 4 : Nd 3+ , Yb 3+ is 929 cm −1 , slightly larger than that of CaGd 2 (MoO 4 ) 4 : Nd 3+ , Yb 3+ (904 cm −1 ). Irradiated by 980 nm laser, PL spectra consist of the Nd 3+ : 4 F j → 4 I 9/2 (j = 7/2, 5/2, 3/2) and Yb 3+ : 2 F 5/2 → 2 F 7/2 emissions located in the near-infrared (NIR) range. Negative and positive thermal quenching behaviors are observed for the emissions of Nd 3+ (754, 802, and 868 nm) and Yb 3+ (1008 nm), respectively, attributed to the cooperative effects of the phonon-assisted energy transfer process of Yb 3+ → Nd 3+ and excited state absorption process of Nd 3+ . Moreover, the host material can affect the luminescence properties, thermal enhancement factor of the NIR anti-Stokes emission, and thermal sensing performance of the Nd 3+ -Yb 3+ pair. Consequently, CaGd 2 (MoO 4 ) 4 : Nd 3+ , Yb 3+ exhibits higher sensing sensitivity (S r-max = ∼6.00%K −1 ) than CaGd 2 (WO 4 ) 4 : Nd 3+ , Yb 3+ (S r-max = ∼5.56%K −1 ). This study provides useful information for the construction of high-performance ratiometric thermometers based on the inverse thermal dependence of the NIR emissions of Nd 3+ and Yb 3+ ions.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Chaoyi Guo,Jie Jiang,Zhihua Zhu,Jinjin Li,Ling Zhao,Zhenhao Xi
Semi-aromatic nylon MXD6 shows superior mechanical strength and gas barrier properties. To improve its toughness and get sight into its excellent properties, a series of poly( m -xylylene adipamide-co-isophthalamide) (MXD6/I) random copolyamides were synthesized using adipic acid, isophthalic acid (IPA) and m -xylylene diamine as monomers via direct melt polycondensation. The effect of IPA content on the thermal, crystallization, heat resistant, mechanical, and barrier properties of the copolyamides were systematically investigated. The results showed that the increase of IPA content from 0 to 12 mol% resulted in a decrease in the melting point of the copolyamides from 238 to 217°C but the glass transition temperature ( T g ) increased from 88 to 105°C. Correspondingly, the Vicat softening temperature decreased from 199.2 to 172.5°C. The crystallization rate of the copolyamides significantly decreased with the increase of the IPA content. The copolyamides had improved elongation and rupture energy and decent oxygen barrier properties with the introduction of IPA. It is expected that this study would guide design of MXD6 macromolecular chain structure to prepare high-performance MXD6 materials.
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FUEL PROCESSING TECHNOLOGY
·
2025
·
IF 7.7
Yi Lin,Zaixing Wang,Lina Tang,Shi Jiang,Yu Guo,Xiaoqin Liu
Ni-based catalysts supported on composite metal oxides (NiO-Al 2 O 3 , MgO-Al 2 O 3 , Co 3 O 4 -Al 2 O 3 ) were synthesized via coprecipitation followed by Ni impregnation to investigate the influence of support composition on catalyst stability in methane steam reforming. Accelerated deactivation protocols (methane decomposition, high-temperature sintering, hydrothermal oxidation) revealed hydrothermal oxidation as the primary cause of irreversible deactivation. The 10Ni/NiAl catalyst (10 wt% Ni/10 wt% NiO-Al 2 O 3 ) showed remarkable regenerability after 923 K hydrothermal treatment, fully restoring its activity. This was attributed to coexisting reduced Ni species and readily reducible NiO, facilitating rapid reactivation. Other catalysts formed thermally stable NiAl 2 O 4 , leading to permanent deactivation. Methane cracking at 973 K had negligible effect, and 10Ni/NiAl catalyst exhibited the lowest carbon deposition (17.02 %). Under extreme hydrogen purged at 1223 K, only the 10Ni/CoAl catalyst exhibited a minor activity decline. The superior stability of 10Ni/NiAl was attributed to an in situ-formed NiAl composite metal oxides during 973 K calcination, which effectively anchored Ni particles, suppressed sintering, and prevented extensive oxidation.
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JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Rui Sun,Qiang Wang,Zhenghao Kou,Yihan Huang,Xinbo Geng,Ruitong Xu,Haowen Yu,Han Jia,Hui Yan
Polyacrylamide (PAM) is widely considered as an ideal candidate for metal corrosion inhibitors due to its cost-effectiveness. Numerous studies improved its corrosion inhibition performance through functional group modification. This study synthesized a novel high-performance modified polyacrylamide corrosion inhibitor (P(AM-co-ATPB), abbreviated as “PAA”) by copolymerizing acrylamide (AM) and allyltriphenylphosphonium bromide (ATPB) monomers. The corrosion inhibition performance of PAM and PAA was evaluated through weight loss tests, surface characterization and electrochemical experiments. PAA can inhibit the mild steel (MS) corrosion in 1 M HCl solution more effectively at the ultralow concentration of 10 mg/L ( η M =85.56 %) than polyacrylamide (PAM) at 500 mg/L ( η M =83.17 %). Then the inhibition mechanism was further investigated using Langmuir adsorption isotherm fitting, quantum chemical (QC) calculations and molecular dynamics (MD) simulations. The unique benzene ring, P and Br atom in PAA enhanced both physical and chemical interactions between the corrosion inhibitor molecules and MS surface Fe atoms. And the π-π stacking among PAA molecules further strengthened the adsorption layer compactness, which should be responsible for its superior corrosion inhibition performance than PAM. This study proved that the additional monomer ATPB markedly improved PAM-based corrosion inhibition efficiency, providing a novel perspective for the molecular structure design of PAM-based corrosion inhibitors.
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