AICHE JOURNAL
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2017
·Vol. 64
·期 6
·2160-2167
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IF 2.836
Cui-Ping Ye,Xiao-Xiao Ding,Wen-Ying Li,Hai Mu,Wei Wang,Jie Feng
To screen suitable solvents for anthracene crystallization, the solubilities of anthracene and metastable zone width were determined in four different solvents, N,N-dimethyl formamide (DMF), xylene, tetrachloroethylene, and diethylene glycol dimethyl ether from 30 to 80 °C at atmospheric pressure using a self-made crystallizer. The cooling modes, solvents, and the effects of carbazole on the solvent crystallization process of anthracene were also investigated. The composition of mother liquors and solid products were measured by gas chromatography; the solids were analyzed by scanning electron microscope, X-ray diffractometer, differential scanning calorimetry, granulometer, and fluorescence spectrometer. The results showed that a uniform anthracene crystal was obtained when using DMF under the forced circulation cooling mode. Solid solution of anthracene and carbazole was initially detected in solvent crystallization. The existence of carbazole in solution has an obvious effect on the crystal morphology of anthracene, to some extent, is beneficial to the crystal growth of anthracene. © 2018 American Institute of Chemical Engineers AIChE J , 64: 2160–2167, 2018
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BIOSENSORS & BIOELECTRONICS
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2018
·
IF 8.173
Weilu Liu,Haifeng Li,Shangmin Yu,Jiaxing Zhang,Weihua Zheng,Liting Niu,Gengen Li
In this work, we reported the synthesis of 3, 6-diamino-9-ethylcarbazole and its application as a new monomer for preparation of molecularly imprinted polymer (MIP) electrochemical sensor . The as prepared MIP sensor exhibited ultrahigh sensitivity and selectivity for the detection of 17-β-estradiol in attomolar levels (1 × 10 –18 mol L −1 ). The sensor works by detecting the change of the interfacial impedance that is derived from recognition of 17-β-estradiol on the MIP layer. The MIP sensor based on 3, 6-diamino-9-ethylcarbazole monomer revealed better performance than that of unmodified carbazole monomer. The monomer/template ratio, electropolymerization scanning cycles, and the incubation pH values were optimised in order to obtain the best detection efficiency. Under the optimised condition, the MIP sensor exhibits a wide linear range from 1 aM to 10 μM (1 × 10 –18 ̶ 1 × 10 −5 mol L −1 ). A low detection limit of 0.36 aM (3.6 × 10 –19 mol L −1 ) and a good selectivity towards structurally similar compounds were obtained. The proposed MIP sensor also exhibits long-term stability and applicability in human serum samples. These advantages enabled this MIP sensor to be a promising alternative of electrochemical sensor and may be extended to detection of other endogenous compounds .
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FOOD CHEMISTRY
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2024
·
IF 8.5
Hua Wang,Lin Hao,Yaxing Guo,Chun Wang,Qiuhua Wu,Zhi Wang
Porous electron-rich organic frameworks have attracted an increased attention in the adsorption and removal of pollutants due to their abundant electron-rich nitrogen atoms, which can effectively interact with positively charged substance. In this study, a porous electron-rich organic framework (Car-POF) and positively charged amino-functionalized magnetic nanoparticles (Fe 3 O 4 -NH 2 ) were used to construct a magnetic electron-rich Fe 3 O 4 -NH 2 @Car-POF for the enrichment of some phenylurea herbicides from water and milk samples prior to high performance liquid chromatographic detection. The adsorption capacity of Fe 3 O 4 -NH 2 @Car-POF for the phenylureas ranged from 14.93 to 28.83 mg g −1 . The LODs were observed in the range of 0.05–0.20 ng mL −1 and 0.5–1.5 ng mL −1 , and LOQs in the range of 0.17–0.66 ng mL −1 and 1.7–5.0 ng mL −1 for water and milk samples with RSD less than 9.0. The adsorption studies with cationic and anionic dyes revealed that Fe 3 O 4 -NH 2 @Car-POF is favorable for the adsorption of positively charged compounds.
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JOURNAL OF MATERIALS CHEMISTRY
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2011
·Vol. 22
·期 2
·520-526
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IF 5.101
Benlin Hu,Fei Zhuge,Xiaojian Zhu,Shanshan Peng,Xinxin Chen,Liang Pan,Qing Yan,Run-Wei Li
A new polyimide bearing the functional pendant 9-phenyl-9H-carbazole moieties, poly[2,2-(4,4′-di(N-benzyloxycarbazole)-3,3′-biphenylene)propane-hexafluoroisopropylidenediphthalimide] (6F-BAHP-PC PI), has been designed as a functional material for resistance memory devices. The ITO/6F-BAHP-PC PI/Ag memory device exhibits nonvolatile resistive switching (RS) with a high ON/OFF ratio (>106), long retention time (>6 × 104 s), good endurance, and low power consumption (∼100 μW). In situconductive atomic force microscopy measurements show that the RS of 6F-BAHP-PC PI originates from the formation/rupture of nanoscale conducting filaments.
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ANALYTICA CHIMICA ACTA
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2012
·
IF 4.555
Yu Chen,Lei Chen,Ruilin Bi,Lan Xu,Yan Liu
A novel chiral molecularly imprinted polymer (MIP) sensor for l -Phenylalanine has been developed, which is constructed by electrochemically driven cross-linking a pendant polymer precursor, poly[2-( N -carbazolyl)ethyl methacrylate-co-meth-acrylic acid]s (PCEMMAs). In this MIP sensing material, the recognition sites, the insulating polymethylacrylic acid (PMAA), were covalently bonded to the conducting polycarbazole which could be used as signal transfer interface between recognition layer and electrode. The mole ratio of copolymerizing monomers, 2-( N -carbazolyl) ethyl methacrylate:methylacrylic acid (CE:MAA), and the scanning cycles of electropolymerization were adjusted during the preparation of MIP sensing material. The optimized conditions, CE:MAA = 3:2 and 20 scanning cycles, were obtained. And then the properties of MIP films were characterized by atomic force microscope (AFM), X-ray photoelectron spectroscopy (XPS) and water contact angle. Open circuit potential–time technique was used to estimate the enantioselectivity of the MIP sensor. The results indicate that the promising sensor preferentially responses l -Phenylalanine ( l -Phe) over d -Phenylalanine ( d -Phe) with a selectivity coefficient K D L = 5.75 × 10 − 4 and the limit of detection (LOD) is 1.37 μM, which reveals its good enantioselectivity and sensitivity.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2012
·
IF 2.905
Bin Hu,Yujian Zhang,Xiaojing Lv,Mi Ouyang,Zhiyan Fu,Cheng Zhang
Two new electrochromic materials consisting of carbazole and phenyl-methanone units, 4-(9H-carbazol-9-yl)-phenyl-methanone (CPM) and 4-(3,6-di(thiophen-2-yl)-9H-carbazol-9-yl)-phenyl-methanone (TCPM), were synthesized and characterized. Both the compounds show well-defined oxidation and reduction processes. Spectroelectrochemical analysis reveals that their polymers display reasonable optical contrast (25%, 41%) and fast switching time (3 s, 2 s). Cyclic voltammogram study confirms that the polymer with the existence of thiophene units is more stable in electrochemical environment.
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ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Qianqian Liu,Rongrong Huang,Jiaqi Tang,Helan Zhang,Mei Liu,Yu Fang
Ethephon (ETH) is widely used to promote fruit ripening and improve fruit quality. However, improper use is harmful to human health and to the environmental safety. Therefore, development of the techniques for on-site and at real-time monitoring of ETH is of importance for its safe use. In this work, we developed a nanofilm-based fluorescence film sensor (FFS) and realized highly efficient detection of ETH in vapor phase, where the detection limit (DL) is <0.2 ppb, the response time is less than 10 s, and the interference is almost free. The unusual sensing performance of the sensor was ascribed to the specific binding of the nanofilm to ETH and to its great porosity, which enables efficient adlayer mass transfer, a requirement for high signal-to-noise ratio. Moreover, visualization-based qualitative sensing is also realized. The nanofilm, a key component of the sensor, was prepared at the humid air/DMSO interface. The building blocks used were a specially designed fluorescent o-carborane derivative (CB-2CHO) and a cross-linker BTN possessing three acylhydrazine groups. The nanofilm as prepared is flexible, uniform, thickness tunable, and photochemically super stable. We believe our effort not only addresses the challenging issue of on-site and at real-time detection of ETH but also provides another route for developing new FFSs via sensing film innovation.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Wenhong Gao,Jiajing Liu,Peilin Zhang,Xin-an Zeng,Zhong Han,Yongxin Teng
In this study, pectin extracted from pomelo peel was investigated using three different combination methods of pulsed electric field (PEF) and cellulase. Three action sequences were performed, including PEF treatment followed by enzymatic hydrolysis, enzymatic hydrolysis followed by PEF treatment, and enzymatic hydrolysis simultaneously treated by PEF. The three corresponding pectins were namely PEP, EPP and SP. The physiochemical, molecular structural and functional properties of the three pectins were determined. The results showed that PEP had excellent physiochemical properties, with the highest yield (12.08 %), total sugar (80.17 %) and total phenol content (38.20 %). The monosaccharide composition and FT-IR analysis indicated that the three pectins were similar. The molecular weights of PEP, EPP and SP were 51.13, 88.51 and 40.00 kDa, respectively. PEP showed the best gel properties, emulsification stability and antioxidant capacity among the three products, due to its high galacturonic acid and total phenol content, appropriate protein and low molecular weight. The mechanism of PEF-assisted cellulase hydrolysis of pomelo peel was also revealed by SEM analysis. These results suggested that PEF pretreatment was the best method, which not only improved the efficiency of enzymatic extraction, but also reduced resource waste and increased financial benefits.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Xudong Zhang,Yang Deng,Yanhua Liu,Fan Yang,Yugao Wang,Jun Shen
Carbazole is a highly value-added compound derived from crude anthracene. Deep eutectic solvents (DESs) have been extensively used as promising green solvents for the separation of target compounds from mixture. In this work, 135 acidic DESs, formed by combining 9 quaternary ammonium salts with 15 common acids, were screened based on the conductor-like screening model for real solvents (COSMO-RS) model. The four top-ranked DESs, including tetraethylammonium chloride (TEAC)/2 acetic acid (AA), TEAC/2 propionic acid (PA), tetrapropylammonium chloride (TPAC)/2AA, and TPAC/2PA were identified as suitable extractants for carbazole separation based on their performance index (PI). Among them, TEAC/2AA had the best separation performance for carbazole due to its highest PI value (1448.19). Liquid–liquid extraction experiments were performed, and the results were in good accordance with those predicted by COSMO-RS calculations. Therefore, TEAC/2AA was determined as the most promising DES for the carbazole separation. The extraction conditions of TEAC/2AA were optimized. The extraction efficiency (EE) and selectivity (SE) of carbazole were 97.67 % and 66.64 %, respectively, under the optimal extraction conditions (25 ℃, 5 min of extraction time, DES-oil mass ratio of 1:5, initial carbazole concentration of 5000 ppm). Additionally, the deionized water was employed to regenerate the DES and recovery of carbazole. The recycling performance of promising DES was also investigated. Finally, quantum chemical calculations and Fourier Transform Infrared spectroscopy (FT-IR) analysis were conducted to explore the separation mechanism. The results indicated that the separation of carbazole by DESs were predominantly dominated by hydrogen bonds and van der Waals interaction. This work provided a valuable reference for the selection and design of DES extractants to separate other high value-added components from mixture.
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CHEMISTRY & BIODIVERSITY
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2024
·
IF 2.3
Yanfang Fu,Yajiao Hong,Shaojie Zhang,Jiaheng Chen,Guorong Wu,Guixiang Wang,Qian Zhang
Ultrasound-assisted extraction of Cissus repens polysaccharides (CRPs) was optimized through response surface methodology (RSM) based on Box–Behnken design (BBD). The maximum CRPs yield (16.18%) was achieved under the optimum extraction conditions: extraction time 72 min, extraction temperature 74 ℃, extraction power 240 W. Then three-phase partitioning (TPP) method combined with gradient alcohol precipitation was used to obtained CRP20, CRP40, CRP60 and CRP80 from CRPs, and CRP80 has a higher purity than others. The primary chemical and structural characteristics of CRP80 were investigated by UV, FT-IR, high-performance liquid chromatography (HPLC) and high-performance gel-permeation chromatography (HPGPC). CRP80 is mainly composed of glucose, galactose, arabinose and mannose, with a molecular weights of approximately 2.95 kDa. Furthermore, the antioxidant activity and hypoglyceamic activity of CRP80 in vitro were evaluated. The results showed that CRP80 had strong scavenging activities on ABTS, hydroxyl and DPPH radicals, as well as high scavenging activities on α-glucosidase and α-amylase. Our research provided an efficient method for the extraction of polysaccharides from C. repens and CRP80 has potential as a promising source of natural antioxidants and hypoglycemic agent for the functional food and medicinal industries.
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CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Wenjian Dong,Yifan Wang,Xia Li,Liangmin Yu,Na Li,Jian Yang,Junchao Yin
Fluorescent antifouling is a method that utilizes substances fluorescent repellent effect to prevent organisms attachment and fouling. It is considered one of the directions for developing environmentally friendly marine antifouling materials. The current fluorescent antifouling materials were characterized by issues such as single functionality, unclear antifouling mechanisms, and suboptimal antifouling performance. In this study, three carbazole derivatives containing carbon–carbon double bonds were synthesized by Friedel-Crafts alkylation reaction, and a series of zinc acrylate resins containing carbazole derivative structures were further synthesized through free radical polymerization. Three carbazole derivatives were tested for their fluorescence and their growth inhibition properties against bacteria and algae. The results showed that the three carbazole derivatives not only had high fluorescence intensity, but also had good inhibitory effects on bacteria and algae, with the highest inhibition rate of 81% on algae. The fluorescence properties, algal inhibition properties and anti-algal adhesion properties of the resin were investigated. The results showed that the fluorescence intensity of the resin was enhanced with the increase of carbazole derivative content. The inhibition rate of the resin against algae was as high as 88.5%, and the anti-algal adhesion rate of the resin was improved under light conditions. Mechanistic studies showed that the resin influenced the cell wall, and the fluorescence caused the algae to prioritize photosynthesis rather than attachment and settlement. Self-polishing performance test results showed that the introduction of carbazole derivatives improved the stability of the resin. The results of the real sea antifouling test show that the resin integrates fluorescence, chemical activity and self-polishing, and has excellent antifouling performance. This provides a theoretical basis for the development of environmentally friendly marine antifouling materials.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
·
IF 8.3
Jie Jiang,Zhenzhen Xue,Yawei Wang,Di Tang,Rongfeng Yuan,Ning Ma,Alaa S. Abd-El-Aziz
12H-NECZ (dodecahydro-N-ethylcarbazole), a promising liquid organic hydrogen carrier (LOHC) with high H 2 capacity, stability, and low dehydrogenation temperature, requires efficient low-cost dehydrogenation catalysts for industrial-scale application. In this work, NiCuAl-LDH-R (hydrotalcite-derived NiCu bimetallic catalyst) with rosette-like two-dimensional structures and highly dispersed NiCu alloys are prepared for the dehydrogenation reaction of 12H-NECZ. The addition of Cu to NiAl-LDH-R can significantly reduce the reaction temperature while achieving rapid dehydrogenation. Among the NiCuAl-LDH-R catalysts, the Ni 7 CuAl-LDH-R exhibited the highest dehydrogenation performance with 100 % dehydrogenation efficiency and 100 % selectivity of NECZ at 180 °C within 4h (12H-NECZ/catalyst mass ratio = 15:1). The electronic and geometric effects of Ni and Cu, excellent dispersion of NiCu alloy, strong metal carrier interaction between NiCu alloy and AlOx, as well as the rich alkalinity synergistically contributes to the catalyst's exceptional dehydrogenation activity. The cost-effective nonprecious catalyst, with tunable morphology/composition and excellent performance, shows great potential for 12H-NECZ dehydrogenation applications.
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