JOURNAL OF MEMBRANE SCIENCE
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2023
·
IF 9.5
Mei-Ling Liu,Yu-Xuan Sun,Ying Tang,Zheng-Jun Fu,Qian Wang,Zhen-Yuan Wang,Shi-Peng Sun
Traditional technologies for solvent/water separation such as distillation and chromatography remain energy intensive. State-of-the-art organic solvent nanofiltration (OSN) membranes exhibit high solvent-solute selectivity, but their ability to discriminate between solvents is limited. Graphene oxide (GO) with homogeneous and tunable 2D nanochannels is a promising solution for this purpose, benefiting from its exceptional transport properties. Here, a one-step pressure-assisted cross-linking strategy was applied to coat GO on the inner surface of hollow fiber membranes. The direction of the external driving force during the assembly of the GO selective layers displays an important influence on the microstructure of the nanochannel and the separation performance. The covalent bonding formed at the GO/polyimide (PI) interface and PI substrate endows the membrane with significantly improved stability in solvent environments. The tunable morphology and hydrophilicity characteristic of the GO layer leads to the rapid transport of acetonitrile while impeding the penetration of water molecules. What's more, the migration route of acetonitrile is shorter than that of water in the cross-linked GO nanochannels. In particular, the cross-linked GO hollow fiber (CGHF) membrane exhibits a high acetonitrile permeance of 145.3 L m −2 h −1 bar −1 , and the dilute acetonitrile solution could be concentrated from 10 wt% to 92.4 ± 3.0 wt%. This means that the elaborately designed nanochannels offer a high energy-efficient prospect for solvent dehydration and OSN.
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JOURNAL OF THE INDIAN CHEMICAL SOCIETY
·
2022
·
IF 0.243
Haijian Liu,Zhenxiang Li,Wei Zhang,Ying Liu,Rongkai Pan,Guofu Huang
Carbon nanodots (CDs) with superior fluorescence performance were obtained by hydrothermal method using tomatoes as raw materials. When the ultraviolet absorption band of tartrazine and the fluorescence spectrum of CDs have complementary overlaps, the fluorescent internal filter effect (IFE) occurred. Furthermore, the degree of quenching of fluorescence intensity of CDs has an excellent linear correlation with tartrazine concentration. And based on this principle, a method for detecting tartrazine was established. As the decrease of fluorescence intensity, tartrazine can be measured in the linear range of 0.1 μM–40 μM. The detection limit is 39 nM, and the recovery rate is 90.7%∼114.5%. The established protocol was also effectively employed to assay tartrazine in beverage samples, indicating that it has great potential for food color analysis.
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FOOD CHEMISTRY
·
2022
·
IF 9.231
Yuechun Li,Han Zhang,Zhaowen Cui,Sijie Liu,Jingke Xu,Conghui Jia,Yaqian Chen,Lulu Wang,Jing Sun,Daohong Zhang,Mingqiang Zhu,Jianlong Wang
Exploring a novel strategy for strengthening the catalytic activity of enzyme facilitates the development of a sensitive enzyme-linked immunosorbent assay (ELISA). Herein, a chemical staining (CS) strategy was firstly discovered to possess the ability to directly improve the catalytic activity of horseradish peroxidase. Based on this discovery, coomassie brilliant blue was introduced into ELISA to establish a CS enhanced ELISA (CS-ELISA) to detect clenbuterol (CL) by simply staining monoclonal antibodies. Satisfactorily, the most important analytical parameters of CS-ELISA, including sensitivity (0.074 ng mL −1 ) and linear range (0.2–2 ng mL −1 ) were all improving 2-folds compared with conventional ELISA. Moreover, the CS-ELISA shows good applicability in the detection of CL in pork tenderloin samples. The proposed CS-ELISA shows various advantages, such as cost-effective, easily accessible, enhanced catalytic activity of enzyme, higher sensitivity, and broader linear range, providing a new insight into enhanced ELISA for food safety.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Huijuan Wen,Xuyang Chen,Yang Wang,Jinrong Yao,Xin Chen,Shengjie Ling,Zhengzhong Shao
An ability to integrate adaptive coloration and tissue-like compositions, structures, as well as mechanical properties, and so forth into a material remains elusive. To address this problem, this work presents a solution whereby these features were integrated into a proteinic artificial skin through biomimetic design. In this artificial skin, silk fibroin was used to mimic the structural framework of the cytoskeleton due to its unique molecular network structure and outstanding and tunable mechanical properties. Meanwhile, a thermochromic filamentous network consisting of C25-GAGAGAGY amphiphilic peptides was designed to mimic the functional tracks in the cytoskeleton, enabling its temperature-adaptive coloration ability. The interconnected linkage between the structural frame and functional units makes this artificial skin have stable structures, mechanical properties, and functions. The whole protein composition also makes this artificial skin essentially different from other existing color-tunable artificial skins, which are a combination of organic and inorganic compounds. Furthermore, because the protein composition is compatible with a range of dyes, the chromatic gamut of adaptive coloration of the developed artificial skin can be further expanded by color fusion. With the further inclusion of other functional units, such as photothermal and magnetothermal nanoparticles, the thermochromism of the artificial skin could be realized through sun exposure and alternating magnetic field modulation. With this diversity in color change pathways and stimulation mode, as well as the environmental friendliness of the material used, these artificial proteinic skins have promising applications as sensors in physiological monitoring, food preservation, and anti-counterfeiting.
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AICHE JOURNAL
·
2022
·Vol. 68
·期 9
·e17795
·
IF 4.167
Chongchong Chen,Xiaoli Wu,Jie Zhang,Jingjing Chen,Xulin Cui,Wenpeng Li,Wenjia Wu,Jingtao Wang
Two-dimensional lamellar membranes are promising for efficient molecule transfer, while the underlying transfer mechanism is rarely elucidated. Herein, heterostructured nanosheets are prepared by self-assembling small-sized hydrophilic cyanuric acid melamine and hydrophobic g -C 3 N 4 nanosheets. Resultant lamellar membranes show comparable affinity to polar and nonpolar solvents, allowing them to dissolve on membrane surface and diffuse through membrane channels. Results demonstrate that for lamellar membranes with distinct wettability, the permeance difference for polar solvents is originated from dissolution and diffusion processes, while that for nonpolar solvents is stemmed from dissolution process. Accordingly, corresponding equations which are suitable for heterostructured lamellar membranes are established. Importantly, polar solvents are induced to form ordered arrangement in hydrophilic nanodomains and then maintain the ordered state in hydrophobic nanodomains, affording a low-resistance transfer and high acetonitrile permeance of 1025 L m −2 h −1 bar −1 . In contrast, nonpolar solvents with disordered arrangement exhibit lower permeance than that of polar ones.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jingjing Chen,Zhijie Yuan,Xiaoli Wu,Jingtao Wang,Yongpeng Yang,Wenpeng Li,Zhongyi Jiang
Here, lamellar membranes with hydrophilic/hydrophobic heterostructured nanochannels are constructed by alternately stacking graphene oxide (GO) and reduced graphene oxide (RGO) nanosheets via dual-needle electrostatic atomization. This technology exhibits facile controllability over membrane nanostructure, where the dual-needle device can compel active reactants to contact in confined space. Through subtly designing spraying parameters, GO and RGO nanosheets can be alternately deposited on the substrate to construct heterostructured nanochannels. And we demonstrate that the asymmetric channel wall-molecule interactions can induce molecule stratification for acetonitrile/water mixture, where hydrophilic GO layer exerts strong attraction to acetonitrile, whereas water molecules are pushed to hydrophobic RGO layer. Then, the strong attraction further induces acetonitrile molecules to form orderly aligned aggregates and transfer quickly, while water molecules are randomly distributed and transfer slowly. The pre-determined different transfer rates afford a high acetonitrile permeance of 38.9 L m –2 h −1 bar −1 and separation factor of acetonitrile/water up to 4.8, surpassing that of homostructured lamellar membranes. Furthermore, this stratification and hence separation performance can be enhanced by channel length, acetonitrile amount in feed, operation temperature and pressure. The first discovery of molecule stratification in heterostructured nanochannels facilitates the sustainable development of advanced separation membranes.
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MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Zhi-Yong Wu,Fu Zhang,Zhi Kuang,Fang Fang,Yan-Yan Song
This study proposed gradient zone electrophoresis on a paper-based analysis device (PAD) for sensitive and rapid colorimetric detection of multiple analytes with smartphone imaging. With experimental optimization, simultaneous stacking and separation of color pigments was successfully demonstrated in 60 s as visualized by real-time smartphone photography. Compared with isocratic zone electrophoresis, the separation was obviously improved. Meanwhile, due to the allowance of larger sample introduction volume in the proposed method, the band intensity was also largely enhanced. Practical application of this PAD method was demonstrated by detection of synthetic pigments in commercial beverages. With the enrichment capability of the proposed method, the signal intensity of brilliant blue and amaranth was enhanced by 60 and 180 times, respectively. The limits of detection (LOD) for the common food pigments brilliant blue and amaranth in beverages were 0.35 and 0.14 μg/mL, respectively. Thanks to the simultaneous separation and enrichment functions of this PAD method, not only a detection LOD close to that of a benchtop spectrophotometer can be simply achieved with a smartphone camera, but spectral interference could also be avoided in multi-component analysis.
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Biosensors-Basel
·
2022
·Vol. 12
·期 5
·326
·
IF 5.743
Shuwen Cheng,Danyao Tang,Yi Zhang,Libin Xu,Kunping Liu,Kejing Huang,Zhengzhi Yin
A novel electrochemical sensor designed to recognize and detect tartrazine (TZ) was constructed based on a molecularly imprinted polydopamine (MIPDA)-coated nanocomposite of platinum cobalt (PtCo) nanoalloy-functionalized graphene oxide (GO). The nanocomposites were characterized and the TZ electrochemical detection performance of the sensor and various reference electrodes was investigated. Interestingly, the synergistic effect of the strong electrocatalytic activity of the PtCo nanoalloy-decorated GO and the high TZ recognition ability of the imprinted cavities of the MIPDA coating resulted in a large and specific response to TZ. Under the optimized conditions, the sensor displayed linear response ranges of 0.003–0.180 and 0.180–3.950 µM, and its detection limit was 1.1 nM (S/N = 3). The electrochemical sensor displayed high anti-interference ability, good stability, and adequate reproducibility, and was successfully used to detect TZ in spiked food samples. Comparison of important indexes of this sensor with those of previous electrochemical sensors for TZ revealed that this sensor showed improved performance. This surface-imprinted sensor provides an ultrasensitive, highly specific, effective, and low-cost method for TZ determination in foodstuffs.Keywords:platinum cobalt nanoalloy;molecularly imprinted polydopamine;graphene oxide;tartrazine;electrochemical sensor
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ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Mi Sun,Biao Ma,Shuai Yuan,Lifei Xin,Chao Zhao,Hong Liu
In this work, we report on the mercury thermometer-inspired test strip for potentiometric detection of salivary α-amylase (sAA). The test strip contains a reaction chamber and two split channels, which are connected by a curved hydrophobic channel. The detection of sAA is based on sequential two-step reactions with preloaded reagents on the test strip. In the first step, maltose is produced by catalyzing the hydrolysis of starch using sAA in the reaction chamber. In the second step, the test strip is shaken to introduce the reaction mixture to the split channels under the inertia force, similar to the operation of a mercury thermometer. In one split channel, maltose reduces [Fe(CN) 6 ] 3- to [Fe(CN) 6 ] 4- under the alkaline condition, while the reaction hardly occurs in the other split channel with the neutral condition. This leads to a difference in the ratio of [Fe(CN) 6 ] 3- /[Fe(CN) 6 ] 4- between the two channels and therefore a potential difference that can be measured and correlated to sAA concentration. Using this test strip, sAA in the human saliva sample was quantitatively analyzed within 2 min. The application of this technique in the psychological evaluation was also demonstrated.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yizhou Chen,Yuting Bai,Lijun Meng,Wenting Zhang,Jingjing Xia,Zhiming Xu,Rui Sun,Yan Lv,Tianxi Liu
Organic solvent nanofiltration (OSN), as an emerging membrane separation technology, holds great potential in pharmaceutical and chemical applications. However, the development of such a promising technology is severely retarded by the trade-off between permeability and selectivity. Herein, we report a novel thin-film nanocomposite (TFN) membrane by incorporating hollow metal-organic frameworks (MOFs) into the metal-phenolic network (MPN) selective layer for highly efficient OSN. This nanocomposite selective layer is fabricated via an aqueous deposition of tannic acid (TA) and Fe II ions with MOFs, during which the MOFs are in-situ etched to a hollow structure. Attributed to the extra transfer channels provided by hollow MOFs, the methanol permeance of the TFN membranes increases to 24.7 L·m -2 ·h -1 ·bar -1 , exhibiting an improvement of 270% compared with the membranes without MOFs (9.1 L·m -2 ·h -1 ·bar -1 ). Meanwhile, the coordination interaction between TA and metal centers in MOFs endows excellent interfacial compatibility between MPN matrix and MOF fillers, guaranteeing a defect-free selective layer and thus high rejection for small organic molecules (>99% for Alcian blue). Furthermore, various MOFs, including ZIF-67, prussian blue (PB), and MIL-53(Al), are also employed to fabricate MPN/MOF nanocomposite membranes, proving the availability and universality of this facial aqueous deposition strategy. Additionally, we also take deep insight into the mechanism of in-situ etching based on the density functional theory (DFT) calculation to pave the way for the fabrication of TFN membranes with other hollow nanofillers. This work provides a sufficient strategy for the design and construction of novel highly efficient OSN nanocomposite membranes with excellent permeability and retention performance.
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JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Jingjing Chen,Xiaoli Wu,Chongchong Chen,Yihao Chen,Wenpeng Li,Jingtao Wang
Two-dimensional lamellar membranes featuring well-defined nanochannels hold great promise for efficient organics separation. However, the extensively existed non-selective microdefects within laminate architecture would impair separation efficiency and structure stability of membranes. Herein, defect-free metal-organic framework (MOF) lamellar membrane is facilely constructed by triple-needle electrostatic atomization technology. Specifically, one needle atomizes small-sized Cu-TCPP MOF nanosheets (TCPP = meso-tetra(4-carboxyphenyl)porphyrin) to build lamellar skeleton, and the other two needles meantime atomize Cu 2+ and TCPP to secondary-assemble crystals among nanosheets. In this manner, these non-selective microdefects are subtly sutured by the regenerated crystals with identical chemical components, resulting in a defect-free MOF lamellar membrane with enhanced structural stability. Importantly, this novel secondary-assembly method highly enhances the separation efficiency and meanwhile keeps high organics permeation for MOF membrane, with rejection of 93.8% for Rose Bengal (1.2 nm) and acetone permeance of 86.9 L m −2 h −1 bar −1 . In addition, the multipoint connection between nanosheets and crystals ensures excellent surface shearing and compaction resistance for MOF membrane, permitting high and steady operation performance for over 100 h. This secondary-assembly methodology by one-step process to construct defect-free and steady lamellar membrane provides a new avenue for the development of efficient separation membranes .
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2023
·Vol. 38
·期 2
·299-303
·
IF 1.6
Fan Hui,Cai Yun,Bai Ping,Yuan Qinwen,Wang Dong,Chen Yuanli
Uniform monodispersed mesoporous silica nanospheres with vertical pores were successfully synthesized using chiral amphiphilic small molecule L-16Ala5PyClO 4 and solvents as dual templates via solgel transcription. The morphologies and pore sizes of silicas are adjustable by changing the type and amount of solvents in the reaction systems. With the increase of the organic solvent content, the morphologies of the obtained silica changed from nanospheres with vertical pore structures to nanosheets structures. When 1 mL of benzene, cyclohexane or toluene were used as solvents, only silica nanospheres were obtained, the BET surface areas of silica nanospheres reached 600.7, 669.5, and 560.8 m 2 /g, respectively. The pore sizes were 3.51, 3.54, and 3.46 nm, respectively. Significantly, these ordered silica nanospheres/poly(vinyl alcohol-co-ethylene) (PVA-co-PE) nanofiber membranes have high separation efficiencies (>99%) for n-hexane/water mixtures.
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