ANALYST
·
2013
·Vol. 139
·期 1
·242-250
·
IF 3.969
Juan Zhang,Wenpeng Zhang,Tao Bao,Zilin Chen
A novel capillary with hydroxyapatite (HAP) as the stationary phase was prepared for open-tubular capillary electrochromatography (OT-CEC). To immobilize HAP, a mussel-inspired polydopamine method was utilized to modify the capillary firstly, generating a polydopamine layer; and then a layer of HAP would be formed on the polydopamine layer by a biomineralization process, to produce a HAP-modified capillary (HAP@capillary). Scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS) and X-ray photoelectron spectroscopy (XPS) provided evidence of nanostructured HAP grown on the surface of the capillary wall. The electroosmotic flow (EOF) characteristic of the HAP@capillary was investigated by varying the percentage of acetonitrile and pH value of the buffer with thiourea as a marker, and a pH-dependent EOF from anode to cathode was observed. The HAP@capillary exhibits high column efficiency for methylbenzene, up to 151 138 plates per meter. Different kinds of compounds including alkylbenzenes, phenols and amines have been successfully separated by the HAP@capillary in CEC mode. The HAP@capillary also possessed good separation ability in capillary liquid chromatography (CLC) mode because of the relatively large ratio of HAP in the capillary; however, the separation efficiency was not as good as that in CEC mode. The reproducibilities of the HAP@capillary were evaluated, and the relative standard deviations were found to be lower than 5%.
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JOURNAL OF CHROMATOGRAPHY A
·
2016
·
IF 3.926
Xiaohong Yang,Changxia Li,Meiling Qi,Liangti Qu
This work presents the separation performance of graphene-ZIF8 (G-Z) composite material as stationary phase for capillary gas chromatography (GC). The G-Z stationary phase achieved high column efficiency of 5000 plates/m determined by n -dodecane ( k = 1.22) at 120 °C and showed weakly polar nature. Importantly, it exhibited high selectivity and resolving capability for branched alkane isomers and aromatic positional isomers, showing clear advantages over the reported neat graphene and ZIF8. In addition, it attained high resolution for geometric cis -/ trans -isomers. The G-Z column exhibited good column thermal stability up to 300 °C and column repeatability with RSD values of retention times in the range of 0.01–0.19% for intra-day, 0.05–0.88% for inter-day and 0.66–5.6% for between-column, respectively, Moreover, the G-Z column was employed for the determination of minor impurity isomers in real reagent samples, which demonstrates its promising potential in GC applications .
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RSC Advances
·
2017
·Vol. 7
·期 5
·2650-2657
·
IF 3.108
Zhike Wang,Cunling Ye,Lingyun Chen,Haili Wu
Adsorptive removals of naphthols are often interfered by some coexisting anions of aqueous solutions. In this work, 1-vinyl-3-octadecylimidazolium cations and p-styrenesulphonate anions were chemically co-modified on silica (denoted as Sil-PImC18-SS) via the click chemistry reaction and were characterized. This material was created with the aim to explore the feasibility of removal of 1-naphthol (1-NAP) and 2-naphthol (2-NAP) from aqueous solutions. The prepared Sil-PImC18-SS was used as an adsorbent to remove 1-NAP and 2-NAP from aqueous solutions and the effects of various variables for the adsorption of 1-NAP and 2-NAP were systematically studied. Among the coexisting anions tested, 0.2 mol L−1 background NaCl or Na2SO4 aqueous solutions had no significant effect on the adsorption of 1-NAP and 2-NAP. The adsorption behaviors of 1-NAP and 2-NAP were well described by the pseudo-second order kinetic and the Dubinin–Radushkevich models with the maximum adsorption capacities of 84.4 mg g−1 and 71.9 mg g−1 for 1-naphthol and 2-naphthol, respectively. The adsorption was a spontaneous and exothermic process, and an adsorption mechanism was speculated to be the cooperative contributions from the hydrophobic interaction, hydrogen bonding interaction, and π–π stacking. Thus, Sil-PImC18-SS can be potentially used as an effective adsorption material for naphthol pollutant removal from the water environment.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Chengxin Zhang,Lulu Yang,Lin Zhao,Yu Liu,Dongfeng Hong,Xiaoyuan Shi,Shaolei Wang,Guangshan Zhu
Various porous adsorbent materials have shown excellent adsorption performance for the removal of organic micro-pollutants in water. However, the practical application was hindered by the high cost or slow adsorption kinetics for most of porous adsorbents. Therefore, it is of great significance to develop economic adsorbent materials with characteristic like low-cost, easier preparation method, excellent adsorption kinetics etc . Herein, based on the Friedel-Crafts alkylation reaction, we reported three novel hydrophilic organic porous adsorbent frameworks (PAF-210, PAF-211 and PAF-212) with high Brunauer-Emmet-Teller (BET) surface area (956 ∼ 1384 m 2 /g) for phenolic micro-pollutants (bisphenol A (BPA), 2,4-dichlorophenol (2,4-DCP) and 2-naphthol (2-NO)) adsorption in water, which were prepared by using cheap trimethyl orthoformate (TMOF) as crosslinker and one-step simple ball milling synthetic method under room temperature within 15 min. Rich oxygen content promotes the resulting polymers to possess excellent hydrophilicity and wettability through water vapor adsorption and water contact angle analysis. The excellent hydrophilicity and proper porous properties made the resulting frameworks suitable as porous organic adsorbents to rapidly remove organic phenolic micro-pollutants from water. Among the resulting polymers, the PAF-210 exhibited ultra-fast adsorption (>94.0 % within 5 s), ultra-rapid adsorption kinetics with pseudo-second-order rate constants (K 2 , up to 7.72g/mg min −1 for 2,4-DCP), high pollutant adsorption capacity (up to 867.03 mg g −1 for BPA) and excellent recyclability (10 cycles with slight loss in adsorption capacity) through systematically characterization. The adsorption performances of PAF-210 are much better than these of the commercial activated carbons and β-cyclodextrin-based porous adsorbents (K 2 = 1.50g/mg min −1 for P-CDP) etc . The favorable hydrophilicity, surface wettability, and adsorption performance of PAF-210 were significantly better than the comparative material constructed by using benzene and formaldehyde dimethyl acetal (FDA) through conventional thermal synthetic method, which is a very classic synthesis strategy in the field of porous materials. More importantly, the PAF-210 exhibited relatively superior adsorption performance on BPA, and it still presented excellent adsorption performance (removal efficiency ≥ 96.8 % within 5 s after 10 cycles) even at the safe range of BPA quantified in drinking water (BPA≤10 μg L −1 , Standards for drinking water quality, GB5749-2022, China). XPS analysis and theoretical simulations proved that the excellent adsorption performance and ultra-fast adsorption rate stem from interactions including π-π interactions, hydrogen bonding and van der Waals interactions between PAF-210 and micro-pollutants.
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Chemical Engineering and Processing-Process Intensification
·
2018
·
IF 2.826
Fajun Wang,Jinpei Huang,Jianhong Xu
Azo dye is a kind of synthetic dye containing azo group (Ar-N=N-Ar). In this paper, an efficient process intensification for the continuous synthesis of azo dye is developed by using a microreactor system. Firstly, the reaction conditions of azo-coupling reaction were optimized and a microreactor was utilized as the mixing and reacting unit. 1- (4- sulfonicphenyl) -3- methyl -5- pyrazolone was the coupling component and aniline was the diazo component. The results show that the yield of azo-coupling reaction was higher than 96% under optimized condition. Then, the reaction conditions of diazotization were optimized by orthogonal experiments in a microreactor system. Combined with the optimization of azo-coupling reaction conditions, the optimal conditions of continuous-flow synthesis of azo dyes in microreactoras were determined. Then, four model azo dyes were synthesized by the continuous method in microreactors. The yields of No. 1, No. 2 and No. 4 azo dyes were above 96% and the yield of No. 3 azo dye was above 90%. Finally, the commercial azo dyes were synthesized continuously in microreactors and the yields were above 94%. The continuous-flow synthesis of azo dyes in a microreactor system has great potential in industrial applications.
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Journal of the Taiwan Institute of Chemical Engineers
·
2018
·
IF 3.849
Zhike Wang,Yunyi Zhu,Haitian Chen,Haili Wu,Cunling Ye
Based on the physicochemical properties of bisphenol A (BPA), chemical co-immobilizations of imidazole, phenyl and hexadecyl were done onto silica to obtain three functionalized silica adsorbents. Accordingly, the combinations of hexadecyl and imidazole, hexadecyl and phenyl, and phenyl and imidazole were named as Sil-(HDTMS-MPS)-VIm, Sil-(HDTMS-MPS)-S and Sil-MPS-(S-VIm), respectively. The composites were characterized by FTIR, TGA and SEM. The aim of this work was to explore how these typical functional groups affect the adsorption behavior of BPA. Experiments demonstrated that alkaline imidazole would play a key role for the BPA adsorption, and the synergy of imidazole and hexadecyl exhibited the highest adsorption affinities for BPA in the pH range of 4.0–9.0 due to the high K ow value of BPA. The maximum adsorption capacity of Sil-(HDTMS-MPS)-VIm for BPA obtained from Langmuir model was 89.6 mg/g at 293 K. Furthermore, the prepared three functionalized silicas retained their good adsorption capacities of BPA in high salt solutions, and the adsorption behaviors of BPA for these adsorbents were well described by the pseudo-second-order kinetic model and the Freundlich model. This work suggests that the synergy of hydrogen bond-forming alkaline functional group and hydrophobic long-chain alkyl group benefits BPA removal from aqueous solutions.
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Metals
·
2024
·Vol. 14
·期 1
·87
·
IF 2.6
Yuantao Yang,Junli Wang,Xuanbing Wang,Jinlong Wei,Xiaoning Tong,Ruidong Xu,Linjing Yang
The electrolytic refining of crude tin is generally carried out in the fluorosilicic acid (H2SiF6) system with the assistance of bone glue and β-naphthol. However, the high saturated vapor pressure and low stability of H2SiF6present environmental concerns and do not align with sustainable development goals. In this paper, the electrochemical behavior of tin on a glassy carbon (GC) electrode was studied in a relatively green and environmentally friendly methanesulfonic acid (MSA) system. Bone glue, sodium lignosulfonate, and β-naphthol were used as additives to make the deposit morphology smooth and to ensure grain refinement. The electrochemical reduction process of Sn2+in an MSA system is a quasi-reversible process controlled by diffusion. The apparent activation energyEa= 14.189 kJ/mol for the ion diffusion of Sn2+was further calculated. The results of chronoamperometry showed that the electrocrystallization of Sn2+on the GC electrode gradually tended to three-dimensional instantaneous nucleation with the increase in applied potential. The morphology and phase of the deposits were analyzed using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that the deposits were uniform and dense pure tin. This work elucidates the electrochemical behavior of tin in a methanesulfonic acid system.
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Microorganisms
·
2025
·Vol. 13
·期 1
·202
·
IF 4.2
Xinyue Sui,Likun Guo,Zixian Bao,Mo Xian,Guang Zhao
Phenolic compounds are industrially versatile chemicals that have been successfully produced in microbial cell factories. Unfortunately, most phenolic compounds are highly toxic to cells in specific cellular environments or above a particular concentration because they form a complex with iron and promote hydroxyl radical production in Fenton reactions, resulting in the ferroptosis of cells. Here, we demonstrated that overexpression of efflux pumps and porins, including porins LamB and OmpN, and efflux pumps EmrAB, MdtABC, and SrpB, can enhanceEscherichia coliphloroglucinol (PG) tolerance by inhibiting the generation of hydroxyl radicals. In addition, LamB and OmpN overexpression improved the bioproduction of PG. Furthermore, efflux pumps and porins can enhance bacterial tolerance to various phenolic compounds, including phenol, catechol, resorcinol, pyrogallol, and 2-naphthol. LamB and MdtABC confer a generalized tolerance to phenols. However, EmrAB, OmpN, and SrpB showed inconsistent effects of bacterial tolerance to different phenolic compounds. Our results will theoretically support the construction of phenolic compound-tolerant bacteria strains, which should be more efficient in the biosynthesis of phenols.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2011
·Vol. 123
·期 5
·2706-2714
·
IF 1.24
Guang Zhu,Jingkun Xu,Ruirui Yue,Baoyang Lu,Jian Hou
Relatively scant work was related to polynaphthalene (PN) and its derivatives because of the unique nonlinear optical properties which make PN and its derivatives owning potential applications in various domains. According to relevant studies, the pursuit for the synthesis of high quality PN films is a great challenge for the applications of PN. To achieve high quality polymer films, three bridged naphthalene derivatives were designed, and finally two crosslinked PN exhibiting space network were electrosynthesized, respectively, by direct anodic oxidation from 1,6-bis(naphthalen-2-yloxy)hexane and 1,4-bis((naphthalen-2-yloxy)methyl)benzene in mixed electrolyte of dichloromethane containing boron trifluoride diethyl etherate. Furthermore, as-formed conducting films were characterized by cyclic voltammetry, spectroscopic analysis, thermal analysis, and scanning electron microscopy. And the series of characterizations indicated that films hold high stability and good blue-light-emitting property. Meanwhile, these polymer films were smooth, shiny, and flexible easily being processed into various shapes by conventional mechanical methods. Consequently, these high quality PN films will facilitate their potential applications as blue-light-emitting materials in organic light-emitting diode. Because di(naphthalen-2-yl) terephthalate was difficult to electropolymerize, the effects of bridged spacers to polymerization were also discussed. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2024
·
IF 4
Zhaopeng Wang,Hui Lv,Yu Zhang,Yanan Li
Acid orange II (AO2) is a synthetic azo dye commonly used illegally in food production and processing. The development of a fast and effective analytical method is crucial for controlling the unlawful use of AO2 in food, especially in seasoning. Here, an antibody specific for AO2 was generated, with 1.01 ng/mL IC 50 and minimal cross-reactivity with other analogs (<1 %, including sunset yellow , tartrazine , para red, chromotrope FB, Sudan Ⅰ, rhodamine B , 2-naphthol, amaranth , ponceau 4 R and allura red AC). Furthermore, a highly sensitive quantum dot beads-based fluorescence immunochromatography assay (QBs-FICA) was established for AO2 determination. The assay had a working range of 23–287 μg/kg with a 11 μg/kg limit of detection (LOD) in chili powder and hotpot seasoning samples. Using spiked samples, the results of QBs-FICA were found to be consistent with those of liquid chromatography-tandem mass spectrometry. This indicates that QBs-FICA is a reliable, rapid, and portable tool for testing of AO2.
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JOURNAL OF CHROMATOGRAPHY A
·
2012
·
IF 4.531
Chuande Zhao,Xingmei Guan,Xiaoyan Liu,Haixia Zhang
A molecularly imprinted polymer was synthesized by ultrasonic irradiation, with attapulgite as matrix using β-naphthol as the template molecule, acryloyl-β-cyclodextrin as the functional monomer, and N,N-methylenebiacrylamide as the cross-linking agent, respectively. The imprinted polymer was characterized by infrared spectroscopy and transmission electron microscopy. Compared to polymers prepared by traditional heat sources, the molecularly imprinted polymer synthesized by ultrasonic irradiation had better selectivity and faster adsorption kinetics to estriol, estradiol, estrone and diethylstilbestrol. Using the imprinted polymer as the packing material for on-line solid-phase extraction, the above four estrogens in milk samples were concentrated and analyzed. The limits of detection for these estrogens were in the range of 1–8 ng g −1 and reproducibility were less than 5.1% as RSDs ( n = 6) with milk samples spiked at 100 and 1000 ng g −1 of each analyte.
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JOURNAL OF CHROMATOGRAPHY A
·
2024
·
IF 3.8
Yali Yang,Jia Chen,Xiaojing Liang,Bei Liu,Kaijun Quan,Xiuhui Liu,Hongdeng Qiu
In this paper, three imidazole- and C18- bifunctional silica stationary phases (Sil-Im-C18) were prepared by adjusting introduction interval of octadecyltrichlorosilane (ODS) and 3-imidazol-1-ylpropyl(trimethoxy)silane (TMPImS), which can be used for reversed-phase liquid chromatography (RPLC) and ion exchange chromatography (IEC) with adjustable performance. The successful preparation of Sil-Im-C18 were confirmed by the characterizations of elemental analysis, infrared spectroscopy (FTIR) and contact angle (CA). Chromatographic performance of Sil-Im-C18 were evaluated by the separation of Tanaka test mixture, alkylbenzenes, linear PAHs and a set of analytes with different properties (uracil, phenol, 1,2-dinitrobenzene and naphthalene), and compared with commonly used C18 column. It was found that the chromatographic performance of Sil-Im-C18 changed significantly with the difference in bonding amount of imidazole and C18. Sil-Im-C18 demonstrated the excellent separation performance towards polycyclic aromatic hydrocarbons (PAHs), phenylesters, phenylamines , phenols and inorganic anions, and notably, nucleobases and nucleosides can be separated using pure water as mobile phases . The van Deemter plot showed that the column efficiency of Sil-Im-C18-3 was 64,933 plate· m − 1 for naphthalene, indicated that Sil-Im-C18 was reasonably chromatographic columns. The RSD values of retention time were 0.22 %-0.61 % for 10 needles alkylbenzenes injected continuously at 50 °C to investigate thermal stability and repeatability, all the fluctuations of k of naphthalene were less than 2.3 % for Sil-Im-C18-1 during flushing 24 h with the mobile phase at different pH values (pH = 3 and 8), the retention time of alkylbenzenes were almost same for Sil-Im-C18-1 at different time, the RSD values of retention time of alkylbenzenes were 0.45 %-2.28 % for two batches Sil-Im-C18-1, revealing the excellent repeatability, thermal stability, durability and reproducibility of Sil-Im-C18, and implying a commercial prospect.
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