SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Miao Lu,Siyuan Zhang,Zhongmei Song,Liang Ma,Haining Liu,Ming Fang,Huifang Zhang,Xiushen Ye,Zhijian Wu
Increased levels of octadecylamine (ODA) and 4-dodecylmorpholine (DMP) in the aqueous, primarily utilized as flotation agents in the worldwide production of potash fertilizer, imperil the stability of ecosystems and the downstream production of high-end chemicals. Nevertheless, there is a dearth of exhaustive studies pertaining to the elimination of ODA and DMP. Herein, the Ti/SnO 2 -Sb/β-PbO 2 anode was fabricated by a thermal decomposition-electrodeposition technique for the electrocatalytic degradation of ODA and DMP. The degradation efficiency of ODA and DMP can achieve complete degradation, reaching 100%, after treatment periods of 10 min and 120 min, respectively. Meanwhile, the TOC removal efficiency of ODA and DMP is up to 85% and 61% at 30 min and 120 min, respectively. In particular, sulphate exhibits inhibitory degradation activity of ODA and DMP in comparison to chloride salt. The recycling and accelerated lifetime tests indicate excellent stability and recyclability of the Ti/SnO 2 -Sb/β-PbO 2 electrode. The mechanism of electrocatalytic degradation involves indirect electrochemical oxidation mediated by free radicals. The primary reactive species responsible for the degradation of DMP and ODA, as determined through scavenger quenching experiments and ESR, are ·OH and Cl·. The degradation of the ODA and DMP commences with the elimination of N element, leading to the formation of the N O 3 - . The carbon chain subsequently undergoes the breakdown. The degradation pathways of ODA and DMP were also proposed based on the GC–MS and H-NMR analyses, respectively. Moreover, the Ti/SnO 2 -Sb/β-PbO 2 anode performed excellently in the removal of ODA and DMP in real samples, TOC removal from ODA and DMP in natural samples was 56% and 52%, respectively, within 180 min. This study provides the first exploration of electrocatalytic degradation mechanisms and pathways of ODA and DMP based on the Ti/SnO 2 -Sb/β-PbO 2 anode.
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ACS Applied Materials & Interfaces
·
2021
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IF 9.229
Teng Chen,Zhiyu Liu,Kai Zhang,Bolin Su,Zhenhua Hu,Hongri Wan,Yan Chen,Xinkai Fu,Zhaojian Gao
A functional material integrated with a variety of functions is highly desired in wastewater treatment. In this research, a mussel-inspired method of immobilizing silver nanoparticles on the skeleton of a melamine sponge is proposed and applied for water remediation. Ag NPs were reduced in situ and grown on a polydopamine-modified melamine sponge. The catalytic reduction of 4-nitrophenol (4-NP) in the presence of the obtained MS-PDA-Ag was evaluated, and the results demonstrated that the MS-PDA-Ag presented high catalytic reduction activity. In addition, the monolithic MS-PDA-Ag presents excellent reusability with no remarkable decrease in catalytic efficiency after multiple reuses. Owing to the immobilized Ag NPs, the MS-PDA-Ag can also effectively inhibit the growth of bacteria against both gram-positive and gram-negative species, making it possible for bacteria elimination in polluted water. To further explore the possibility of utilizing the MS-PDA-Ag for versatile applications, a superhydrophobic derivative (S-MS-PDA-Ag) was prepared by coating a low-surface-energy substance (octadecanethiol) on the surface of MS-PDA-Ag. The obtained S-MS-PDA-Ag presents the capacities of oil/organics adsorption and water repellence, which can separate the insoluble oil/organics from water. The melamine sponge immobilized with Ag NPs demonstrates prominent catalytic reduction of 4-NP, antibacterial activity and the superhydrophobic derivative presents the capacity of insoluble oil/organics separation from oil–water mixtures, exhibiting high potential in the remediation of polluted water.
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POLYMER
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2020
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IF 4.231
Yufei Liu,Siyuan Jiang,Wei Yan,Jun Qin,Min He,Shuhao Qin,Jie Yu
Improving complexation at the interfaces and regulating the crystal transformation behaviors of polyamide 6 (PA6) composites with high mechanical and thermal properties are essential for the industrial applications of PA6. In this work, the effects of adding p (N-(4-F-phenylmaleimide)-alt-styrene) (PFS) on the crystal transformation, thermostability, thermal conductivity , and mechanical properties of PA6 were investigated and discussed systematically. The resu---lts from heat deflection temperature (HDT), dynamic mechanical analysis (DMA ) and thermal conductivity tests indicate that PFS greatly increases the HDT, glass-transition temperature ( T g ), and thermal conductivity of PA6. Simultaneously, when the content of PFS is 10%, the tensile strength and flexural moduli of PA6/PFS composites are increased by 10.5 and 17.8% compared with that of pure PA6, respectively. The results from differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) show that PFS induces the transformation of PA6 from γ to α crystals by interfacial complexation. This work offers a facile approach for producing materials with high thermal and mechanical performances that can be potentially used in automobiles, electronics, and related technologies.
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SENSORS AND ACTUATORS B-CHEMICAL
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2020
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IF 7.1
Yanlei He,Ning Li,Weikang Li,Xianxi Zhang,Xiao Zhang,Zhenxue Liu,Qingyun Liu
5,10,15,20-tetrakis (4-carboxylphenyl) porphyrin functionalized NiCo 2 S 4 yolk-shell nanospheres (Por-NiCo 2 S 4 ) were fabricated by a facile and efficient solvothermal strategy and demonstrated to possess excellent peroxidase-like activity. Compared with pure NiCo 2 S 4 nanospheres, Por-NiCo 2 S 4 exhibits the superior peroxidase activity, which was evaluated by the fast oxidation of 3,3′,5,5′-tetramethylbenzidine (a chromogenic substrate, TMB) by H 2 O 2 to form the blue product (oxTMB) only in 10 s. The systematic studies including radical scavenger, fluorescence probe, and electrochemical experiments confirm that superoxide free radicals ( O 2 − ) play a key role in catalytic reactions, in addition to the synergistic effect of holes (h + ). Based on the developed peroxidase activity of Por-NiCo 2 S 4 , and combined with cholesterol oxidase (Chox), a fast cascade reaction sensing platform has been constructed to quantitatively determination cholesterol in a wide linear range of 0.1−9.0 mM with the detection limit of 19.36 μM. The Por-NiCo 2 S 4 based colorimetric biosensing platform has been used for determining the levels of total cholesterol in serum samples, indicating Por-NiCo 2 S 4 is expected to be used as the promising materials for fast visual colorimetry in clinical medical detection.
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ANALYTICAL LETTERS
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2020
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IF 1.467
Yazhou Shuang,Zhigang Cao,Tianci Zhang,Laisheng Li
A mono-6-(4-nitrophenyl)-ureido-β-cyclodextrin-bonded chiral stationary phase (NCDSP), containing π-electron withdrawing groups, was prepared by immobilizing a self-prepared mono-6-(4-nitrophenyl)-ureido-β-cyclodextrin ligand onto ordered mesoporous silica gel SBA-15, on which the ligand was synthesized by the reaction of mono-6-amino-β-cyclodextrin with 4-nitrophenylisocyanate. The structure of NCDSP was characterized by infrared spectroscopy, elemental analysis, thermogravimetric analysis and solid nuclear magnetic resonance. The introduction of electron-withdrawing (π-acidic) groups facilitated the separation of the π-electron-rich (π-basic) triazole chiral pesticides. In addition, the ureido group linkage allowed NCDSP to be a hydrogen bond-accepting and -donating chiral station phase and prevented the hydrolysis associated with nitrobenzoate and nitrophenylcarbamate linkages. As a result, the enantioseparations of nine triazole pesticides were achieved using NCDSP. Meanwhile, the chromatographic conditions, such as the pH and the composition of mobile phases, were investigated in detail. Moreover, in a comparative study with a cyclodextrin stationary phase (CDSP), the NCDSP provided higher enantioselectivity. Baseline separations for most of these triazoles on NDCSP were observed in relatively short times from 10 to 20 min. The highest resolution achieved was 2.87. Otherwise, incomplete enantiomeric separation was observed on the CDSP with a maximum resolution of less than 1.18. For the NCDSP, in addition to the inclusion effect, the π-π interaction between the electron-deficient stationary phase and the electron-donating triazoles significantly contributed to the chiral separation. This work reports a simple and convenient method for the preparation of the NCDSP with the rapid separation of chiral triazole pesticides.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2020
·Vol. 22
·期 20
·11508-11518
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IF 3.43
Jing Chen,Hanling Yang,Hongquan Fu,Hongyan He,Qiang Zeng,Xuehui Li
Electrochemical oxidation is a promising and effective method for lignin depolymerization owing to its selective oxidation capacity and environmental friendliness. Herein, the electrooxidation of non-phenolic alkyl aryl ether monomers and β-O-4 dimers was experimentally (by cyclic voltammetry, in situ spectroelectrochemistry, and gas chromatography-mass spectroscopy) and theoretically (by DFT calculations) explored in detail. Compared to the reported literature (T. Shiraishi, T. Takano, H. Kamitakahara and F. Nakatsubo, Holzforschung, 2012, 66(3), 303–309), 1-(4-ethoxyphenyl)ethanol showed a distinguishable oxidation pathway, where the resulting carbonyl product surprisingly underwent a bond cleavage on alkyl–aryl ether to ultimately produce a quinoid like compound. In contrast, β-O-4 dimers, like 2-phenoxy-1-phenethanol and 2-phenoxyacetophenone also demonstrated electrochemical oxidation induced by Cβ–O and Cα–Cβ bond cleavages. For the oxidation products, the presence of the Cα-hydroxyl group in dimers was the key to selectively generate aldehyde-containing species under mild electrochemical conditions, otherwise it produces alcohol-containing products following a different mechanism compared to the CαO containing dimers.
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高影响因子
LANGMUIR
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2020
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IF 3.557
Renxuan Liu,Ying Hou,Shangjun Jiang,Bei Nie
We report a facile approach to fabricate an Ag-embedded fullerene (C60) catalyst by the chemical reduction of the AgNO3 complex encapsulated fullerene microcrystal, which showed an enhanced catalytic reduction of 4-nitrophenol because of the strong absorption and propagation of H2 along the fullerene surface. With the aid of visible-light radiation, photodegradation of orange G dye is achieved through the formation of an electron donor–acceptor dyad between plasmon Ag nanostructures and fullerene molecules, which effectively offsets the “electron–hole” recombination. Neither Ag nanoparticle nor fullerene crystal used in isolation could perform this chemical conversion, implying that the metal–fullerene hybrid structure is imperative for performing the catalytic reaction. The obtained Ag-embedded fullerene crystal is characterized by scanning electron microscopy (SEM), associated energy-dispersive X-ray spectroscopy (EDX) imaging, and X-ray photoelectron spectroscopy (XPS) and demonstrates that the present hybrid materials would add a supplemental member to a family of photocatalysts toward the organic synthesis and wastewater remediation.
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International Journal of Environmental Research and Public Health
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2020
·Vol. 17
·期 2
·651
·
IF 2.849
Xinxin Huang,Yuanyuan Li,Tantan Wang,Hui Liu,Jiaqi Shi,Xuesheng Zhang
Organic UV filters are a kind of emerging pollutants, which have been widely used in personal care products (PCPs). This study evaluated the effects of benzophenone-4 (BP-4), 4-aminobenzoic acid (PABA), and 2-phenylbenzimidazole-5-sulfonic acid (PBSA) on the selected indices of antioxidative responses in zebrafish (Danio rerio) liver. Zebrafish were exposed to two different doses (i.e., 0.5 and 5 mg L−1) of semi-static water with three individual compounds. Liver samples were collected on 7 and 14 days to analyze biochemical indicators, including superoxide dismutase (SOD), glutathione S-transferase (GST), reduced glutathione (GSH), and malondialdehyde (MDA). Oxidative stress occurred in zebrafish liver with significantly changed indicators during the whole exposure period. Different experimental groups could induce or inhibit the activity of antioxidant enzymes with varying degrees. With a prolonged exposure time and increased exposure dose, the hepatic lipid peroxidation was also obviously observed. Moreover, the toxicity order of three organic UV filters was analyzed using the integrated biomarker response (IBR) index and the results indicate that exposure to PABA for 7 days at 0.5 mg L−1and PBSA for 7 days at 5 mg L−1induced the most severe oxidative stress in the liver of zebrafish.Keywords:organic UV filters;oxidative stress;lipid peroxidation;integrated biomarker response;zebrafish
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JOURNAL OF MOLECULAR LIQUIDS
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2019
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IF 4.561
Wenbo Zhu,Yongzhong Jia,Jinhe Sun,Pengrui Zhang,Fei Shao,Yan Jing
A novel synergistic extraction system was studied for the separation of lithium isotopes using lithium salts solution as aqueous phase and dichloromethane containing 4′-acetylbenzo-15-crown-5 and [BMIm][NTf 2 ] as organic phase with solvent extraction method . The key factors such as anions of lithium salts, concentrations of LiNTf 2 , initial pH values of aqueous phase, solvents, volume ratio of dichloromethane and [BMIm][NTf 2 ] were investigated in this study. Results showed that the maximum extraction rate of lithium was 68.36% and the maximum single stage separation factor of 6 Li and 7 Li was 1.056 ± 0.002. The formed complex in organic phase was studied by the slope analysis method, which indicated that the complex was composed of Li-ion and 4′-actylbenzo-15-crown-5 by 1:1. The thermodynamic parameters of the 6 Li and 7 Li exchange reaction were calculated by data obtained on temperature during experiments, which explained that the exchange behavior of 6 Li and 7 Li in this system was a spontaneous exothermic reaction . In addition, this system was able to efficiently separate lithium isotopes at lower temperature.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
·
IF 3.218
Haiyan Jia,Taotao Yang,Quan Xu,Jingkun Xu,Limin Lu,Yongfang Yu,Ping Li
In this paper, core-shell structured poly (indole‑5‑carboxylic acid) @ poly (3, 4‑ethylenedioxythiophene) (PIn‑5‑COOH@PEDOT) composite was prepared by a facile two-step chemical oxidation method. The composite possesses large specific surface area, high stability, good electrical conductivity and redox activity, which was designed as label-free electrochemical immunosensing platform for the monitor of the prostate specific antigen (PSA). In this sensing system, PIn-5-COOH served as both signal molecule and antibody carrier. The coating PEDOT was used to enhance the conductivity and stability of PIn-5-COOH. Benefiting from the synergistic effects between PIn-5-COOH and PEDOT, the fabricated immunosensor exhibited a wide linear range of 0.01–25 ng mL −1 and low detection limit of 3.4 pg mL −1 (S/N = 3) for the assay of PSA, coupled with good selectivity, reproducibility and stability. The immunosensor is simple, sensitive, specific and reproducible, which could provide a potential approach for clinical diagnosis.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
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2018
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IF 2.441
Qiong Lou,Jun Wen,Yuanying Jiang,Jinghua Huang,Guorong Fan,Fenyun Song
A reliable liquid chromatography/tandem mass (LC-MS/MS) method was developed for quantitation of 3′, 4′-dimethoxy flavonol-3-β- d -glucopyranoside (DF3G) in rat plasma using pantoprazole as the internal standard. An Agilent C18 column (100 mm × 3 mm, 3.5 μm) was performed for chromatographic separation with the mobile phase composed of methanol-water (containing formic acid) at a flow rate of 0.4 mL/min. A triple-quadrupole mass spectrometry equipped with an electrospray ionization (ESI) source in positive ion mode was applied to quantitative analysis by multiple reacting monitoring (MRM). The MRM precursor-product ion transition of DF3G and Pantoprazole (IS) were m / z 461.1 → 299.2 and 383.9 → 200.2, respectively. Calibration curves were recovered in a concentration range of 1–500 ng/mL for plasma with a limit of lower quantification (LLOQ) of 1 ng/mL. The intra-day and inter-day precision were not >10%. The accuracy of DF3G ranged from −10% to 0.53% in quality control (QC) samples at three concentrations. DF3G was not degraded during the analysis and the storage period. All the data were validated in accordance with the FDA bioanalytical method validation guideline. The LC-MS/MS method was successfully employed in the pharmacokinetic study of the DF3G after oral administration and intravenous injection in rats.
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TALANTA
·
2019
·
IF 4.916
Wenfang Deng,Chang Cheng,Hui Yang,Hui Wang,Yueming Tan,Qingji Xie,Ming Ma,Shouzhuo Yao
We report here a sensitive method for immunoassay of Staphylococcus aureus ( S. aureus ) based on colorimetric and fluorescent responses of 4-chloro-7-nitrobenzo-2-oxa-1,3-diazole (NBD-Cl) to l -cysteine (Cys). S. aureus cells were separated from samples by immunomagnetic nanoparticles and labeled with Cys-encapsulated liposome ( [email protected] ) immuno-nanocapsules. After mangnetic separation, the [email protected] immuno-nanocapsules linked to bacterial cells were destructed by Tween-20, and then the released Cys molecules reacted with NBD-Cl to generate colorimetric and fluorescent signals. Due to the amplification effect of liposome nanocapsules , the high capture efficiency of immunomagnetic nanoparticles, and the high responses of NBD-Cl to Cys, the detection limits for colorimetric and fluorescent detection of S. aureus were as low as 10 and 1 CFU mL −1 , respectively. The proposed method was successfully used to detect S. aureus in milk samples. This work has provided a novel NBD-Cl based colorimetric and fluorescent platform for immunoassay.
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