Environmental Science-Nano
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2019
·Vol. 6
·期 10
·3060-3071
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IF 7.704
Zhangjingzhi Chen,Jun Wang,Xiaoguang Duan,Yuanyuan Chu,Xiaoyao Tan,Shaomin Liu,Shaobin Wang
3D graphene-based macrostructures have been recognized as promising candidates for adsorption and separation of water pollutants due to their well-defined porous structures and high surface areas. In this work, 3D graphene oxide hydrogel membranes (GOHMs) are fabricated by gelation of GO with ferrous ions via vacuum filtration. The ferrous ions serve as cross-linkers to increase the bonding strength between GO nanosheets and to induce microstructure transformation of GO via cation–π interactions to form a 3D lamellar porous structure. Compared with the pure GO membrane, GOHMs not only display high stability in water but also show considerably improved water permeability (111.5 L m−2 h−1 bar−1) and retention performances (>99%) for methylene blue (MB), because the hydrogel structure impressively enhances the connectivity of nanopores as well as the adsorption capacity. In addition, the nanostructures of GOHMs can be controlled by adjusting the amounts of GO or ferrous ions. The water permeation and MB retention reveal the structural changes of different GOHMs, which are consistent with the observations from scanning electron microscopy (SEM) and X-ray diffraction (XRD). Besides, GOHMs exhibit high permeation and separation performances in a wide pH range, and could effectively remove diverse organic contaminants by a facile filtration process via different separation mechanisms. Therefore, the GOHMs demonstrate a promising technique for practical wastewater purification.
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FOOD CHEMISTRY
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2019
·
IF 5.399
Xiuying Liu,Keke Chen,Jiayan Wang,Yu Wang,Yiwei Tang,Xue Gao,Lijie Zhu,Xuepeng Li,Jianrong Li
Fish freshness monitoring is important for consumers. This study aims to develop an colorimetric sensing label based on bromocresol green (BCG) and a sol-gel matrix layer coated onto filter paper to monitor fish freshness. Characterization results showed that the sol-gel layer was successfully coated, and the coating yield was 14.25%. The fish freshness could be detected clearly by the naked eye as the color of the sensing label changed. A Hue Saturation Value (HSV) model was used to correlate the response of the sensing label to the freshness of fish samples. Hue (H) values showed a linear response to the total volatile basic nitrogen (TVB-N) concentration in the range of 16.4–23.11 mg/100 g at room temperature, and in the range of 9.28–24.12 mg/100 g at a chilled temperature. The sensing label was applied to other types of fish, and showed an intense color change during the spoilage trial.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Wenjun Wang,Jiang Li,Rongheng Li,Benqiang Li,Xuesong Mei,Xuefeng Sun
Fabrication of a hierarchical macro-/micro-/nano compound eye is presented in this paper. This bioinspired compound (BIC) eye is obtained by an integrated manufacturing technology that combines (i) nanoimprinting, (ii) picosecond laser swelling, and (iii) air-assisted deformation. The diameter and height of nanopillars, microlens, and macrobase can be controlled precisely by fine-tuning the process parameters. The multifunctional properties of the BIC eye, such as superhydrophobicity, antireflection, and other optical characteristics, are investigated. It is found that the microlens with nanopillars can effectively improve the surface wettability with a contact angle of 152° and contact angle hysteresis of 12°, and enhance transmittance by 2% over the wavelength range of 200–1200 nm. Moreover, the final hierarchical compound eye exhibits the excellent imaging properties and a wide field-of-view of 120° without distortion. These multifunctional properties will enable the widespread application of the compound eye in diverse real-time environmental conditions.
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Nanomaterials
·
2018
·Vol. 8
·期 10
·800
·
IF 3.504
Peng Lu,Ren Liu,Xin Liu,Min Wu
Cellulose hydrogels are often prepared from native cellulose through a direct cellulose dissolution approach that often involves tedious process and solvent recovery problems. A self-supporting cellulose hydrogel was prepared by gelation of the TEMPO-oxidized bagasse cellulose nanofibrils (CNF) triggered by strong crosslinking between carboxylate groups and Zn2+. TEMPO process was used to generate negatively charged carboxylate groups on CNF surface to provide a high binding capability to Zn2+. Three TEMPO-oxidized CNFs of different carboxylate contents were prepared and characterized. TEM and AFM microscopes suggested that the sizes of CNFs were fined down and carboxylated cellulose nanofibrils (TOCNFs) of 5–10 nm wide, 200–500 nm long, and carboxylate contents 0.73–1.29 mmol/g were obtained. The final structures and compressive strength of hydrogels were primarily influenced by interfibril Zn2+-carboxylate interactions, following the order of TOCNFs concentration > content of carboxylate groups > concentration of zinc ions. A CO2sensitive self-supporting cellulose hydrogel was developed as a colorimetric indicator of food spoilage for intelligent food packaging applications.Keywords:hydrogel;cellulose nanofibrils;zinc ions;ionic cross-linking;bagasse cellulose fiber
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MATERIALS CHEMISTRY AND PHYSICS
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2014
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IF 2.129
Mingyi Tang,Sai Zhang,Xianxian Li,Xiaobo Pang,Haixia Qiu
A facile and efficient approach to synthesize Fe 3 O 4 @Cu nanocomposites using l -Lysine as a linker was developed. The morphology, composition and crystallinity of the Fe 3 O 4 @Cu nanocomposites were characterized by Fourier Transform infrared spectroscopy , transmission electron microscopy , energy-dispersive X-ray spectroscopy, and powder X-ray diffraction. In addition, the magnetic properties were determined with vibrating sample magnetometer . The surface of the Fe 3 O 4 contained many small Cu nanoparticles with sizes of about 3 nm. It was found that the Fe 3 O 4 @Cu nanocomposites could catalyze the degradation of organic dyes. The catalytic activities of the Fe 3 O 4 @Cu nanocomposites for the reduction of nitrophenol were also studied. The Fe 3 O 4 @Cu nanocomposites are more efficient catalysts compared with Cu nanoparticles and can easily be recovered from the reaction mixture with magnet. The cost effective and recyclable Fe 3 O 4 @Cu nanocomposites provide an exciting new material for environmental protection applications.
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Small
·
2014
·Vol. 10
·期 13
·2595-2601
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IF 7.514
Jinyou Shao,Yucheng Ding,Wenjun Wang,Xuesong Mei,Haipeng Zhai,Hongmiao Tian,Xiangming Li,Bin Liu
Graphical A facile technique for the fabrication of fully-covering multiscale structures surfaces by nanoimprinting and modified laser swelling is presented. The approach is proved to be capable of generating regular and adjustable dome-like hierarchical structures, and it is used to create nature-inspired, multiscale functional surfaces with tunable wettability.
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MICROCHIMICA ACTA
·
2015
·Vol. 182
·期 13
·2313-2320
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IF 3.741
Xu Yan,Jin Jingjie,Li Xianliang,Han Yide,Meng Hao,Song Chaosheng,Zhang Xia
We describe a facile method for the preparation of magnetic microparticles consisting of a metal-organic framework (MOF) of Cu(II)-BTC (BTC = 1,3,5-benzenetricarboxylate) for rapid magnetic solid-phase extraction (MSPE) of the dye Congo Red (CR) from aqueous solution. Magnetization of the MOF and solid-phase extraction of CR was simultaneously accomplished by mixing, under ultrasonication, the MOF and silica-coated magnetite microparticles in the solution to be extracted. Under optimized conditions, the magnetic MOF hybrid exhibits a fast adsorption rate and a high removal efficiency (>97 %) toward CR even over 15-fold reuse, which also features high adsorption capacity of 97.7 and 92.5 % for cationinc Methylene Blue (MB) and Crystal Violet (CV), respectively. The desorption of CR from the magnetic MOF was realized by washing it with ethanol and water. The material is considered to be a promising new adsorbent for use in wastewater treatment and in analytical preconcentration.
We report on a method for magnetization of a Cu-BTC metal-organic framework for use in rapid magnetic solid phase extraction of Congo Red from aqueous solutions. The material maintains its high removal efficiency (of >97 %) over 15 recyclable experiments.
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MOLECULES
·
2016
·Vol. 21
·期 1
·97
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IF 2.465
Chang-Wei Zhang,Cheng-Zhang Wang,Ran Tao
In this study, high performance liquid chromatography (HPLC), ultraviolet (UV), thermagravimetric analyzer (TGA), pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS), and scanning electron microscope (SEM) were used as measurement techniques, contents of chemical composition, pyrolytic products, thermal stability, morphological characterization ofGinkgo bilobaleaves (GBL) acted as the index, and physicochemical properties of GBL after enzymolysis based ultrasound extraction (EBUE) and Soxhlet extraction were studied. The detection results of chemical composition revealed that contents of general flavone, soluble protein, soluble total sugar and protein in the GBL declined significantly after EBUE, and contents of polyprenols and crude fat obviously reduced as well after Soxhlet extraction. Py-GC-MS results indicated that total GC contents of micromolecules with carbon less than 12 from 54.0% before EBUE decline to 8.34% after EBUE. Total GC contents of long-chain fatty acids with carbon less than 20 from 43.0% before EBUE reduced to 27.0% after Soxhlet extraction. Thermal stability results showed that GBL after Soxhlet extraction was easier to decompose than GBL before EBUE. SEM results illustrated that surface structure of GBL was damaged severely after EBUE, compared with GBL before EBUE, while organic solvent extraction had little influence on the morphological characterization of GBL after Soxhlet extraction compared with GBL after EBUE.Keywords:physicochemical properties;Ginkgo bilobaleaves;enzymolysis;ultrasound;Soxhlet extraction
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ChemNanoMat
·
2017
·Vol. 3
·期 4
·259-268
·
IF 2.937
Heng Li,Ying-Jie Zhu,Ying-Ying Jiang,Ya-Dong Yu,Feng Chen,Li-Ying Dong,Jin Wu
Graphical A strong flexible fire-resistant hydroxyapatite (HAP) paper based on network-structured HAP nanowires is reported. A new low-cost method is also developed for the large-scale synthesis of HAP nanowires using water as the only solvent. High-strength flexible inorganic paper with fire-resistant and adiabatic properties is highly demanded in various high-temperature applications. However, constructing inorganic paper that not only has high strength and high flexibility at room temperature but also can prevent the high-temperature-induced friability is still a great challenge. Inspired by the hierarchical structure and excellent mechanical properties of the tooth enamel, we have developed a systematic approach for the bottom-up fabrication of multi-hierarchical fire-resistant hydroxyapatite (HAP) nanowire paper with balanced tensile strength and flexibility that includes four steps: (1) the synthesis of monodisperse HAP nanowires from the molecular level to the nanoscale; (2) the self-assembly of HAP nanowires into long fibers and two-dimensional (2D) nanowire networks from the nanoscale to the mesoscale; (3) the layered assembly of 2D nanowire networks into the highly flexible high-strength fire-resistant paper from the mesoscale to the macroscale; (4) reinforcing the HAP nanowire paper with inorganic additives to enhance the tensile strength and to overcome the high-temperature-induced pulverization. By adopting this strategy, the mechanical properties of the fire-resistant HAP nanowire paper are greatly improved. The experimental results show that the tensile strength of the as-prepared HAP nanowires-based inorganic paper is greatly enhanced to ≈15 MPa, which is close to that of the commercial copying paper, and the A4-sized HAP nanowires-based inorganic paper is highly flexible and can be directly printed using a commercial printer. Owing to the synergistic effect of all components and the unique hierarchical structure, the as-prepared fire-resistant HAP nanowire paper can also preserve well its high flexibility even under high-temperature conditions.
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Food Bioscience
·
2024
·
IF 4.8
Ruichun Wang,Songyi Lin,Junbo Chu,Yi Yuan,Simin Zhang
Eleutheronema Tetradactylum is commercially important marine fish and a fixture at tables. However, nonnegligible hazardous substances, such as heterocyclic aromatic amines (HAAs) and advanced glycation end products (AGEs), generates along during thermal processing. Herein, we determined HAAs and two representative AGEs, Nε-carboxyethyl-lysine (CEL) and Nε-carboxymethyl-lysine (CML) formation in roasted Eleutheronema Tetradactylum , and proposed inhibitory method of tea polyphenol to effectively reduce HAAs, CML and CEL, which caused 51.23, 46.72, 24.06 and 35.48 percentage reduction of Norharman, Harman, CML and CEL, respectively, led IQ, 8-MeIQx below detected limitation. Precursors (amino acids, creatin(in)e, glucose and glyoxal), lipid oxidation, fatty acid analysis and further nontargeted lipidomic approaches are attempted to reveal the inhibition mechanism. This work develops a new method to minimize HAAs and AGEs in Eleutheronema Tetradactylum , provide a comprehensive interpretation of inhibition mechanism by tea polyphenols, which is helpful to food manufacturers for healthier fish production.
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Advanced Optical Materials
·
2024
·Vol. 12
·期 21
·2400576
·
IF 8
Moushira. A. Mohamed,Mohamed. A. Ali,Guo Shaorun,Xiaofeng Liu,Jianrong Qiu
Long persistent luminescence materials (LPLMs) are promising candidates for various photonic applications, owing to their ability to store light. In spite of advancements in exploring of new LPLMs, the fabrication of transparent centimeter-sized LPLMs with pre-designed shapes, high productivity, long afterglow multicolor luminescence, and high chemical stability, is still challenging. Here, high-throughput manufacture of translucent crystal-glass composites via a classical injection molding (IM) technique is demonstrated, in which persistent phosphors (PPs)-amorphous silica nanoparticles-polymer composites are molded into different shapes then thermally treated at elevated temperatures to obtain glass composites with embedded PP particles and customized shapes. The structural characterizations endorse that the PP particles are preserved during high temperature sintering, and the resultant crystal-glass composites combine the unique benefits of both PPs and silica glass. Remarkably, the total production time to manufacture 100 pieces of centimeter-sized crystal-glass composites is 35 h, thus enabling high-throughput production of glass composite articles by the IM method. In addition, the injection molded crystal-glass composites demonstrate long afterglow multicolor luminescence and ultrahigh chemical durability. This study provides a massive production strategy for the fabrication of translucent and stable multicolor persistent luminescent objects with customized shapes, which can be used in numerous applications.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Liqin Tang,Yingjie Zhang,Huiru Zhang,Xiao Yang,Jun Wang,Jifu Mao,Lu Wang,Yan Li
Diabetic wounds, often multifactorial and affecting multiple organs, pose substantial challenges to patient well-being, drawing significant interest in biomedical engineering. The demanding wound microenvironment, marked by heightened glucose levels, local exudate, and bacterial infections, emphasizes the pressing demand for advanced wound dressings to meet escalating clinical needs. Herein, a Janus wound dressing with an integration of an antimicrobial hydrophobic nanofiber layer and a 3D hydrophilic sponge was designed and prepared to manage and utilize wound exudate. The hydrophobic layer skillfully combined electrospun poly(ε-caprolactone) (PCL) nanofiber membranes (ENMs) and metal–organic frameworks (MOFs) with peroxidase-like properties by solvent etching, and glucose oxidase (GOx) was grafted through ligand interaction. GOx acts to consume glucose while modulating pH, thus suitable pH and self-supplied H2O2 were able to activate the catalytic activity of MOFs to generate •OH. Additionally, hydrophilic 3D sponges are constructed using gas foaming technology, which are tactfully combined with hydrophobic ENMs to form a Janus structure, which can transport exudate through the antimicrobial layer to the sponge layer, while sufficient glucose contact with GOx enhances the antimicrobial properties of the designed Janus wound dressing. Experimental results demonstrate the effectiveness of the cascade effect of GOx@PCL/MOF ENMs, ultimately releasing reactive oxygen species and exhibiting robust antibacterial properties. In vivo animal experiments reveal the ability of the Janus wound dressing to mitigate methicillin-resistant Staphylococcus aureus (MRSA) infections in the early stages, thereby expediting the wound healing process. In vivo animal study, the Janus wound dressing achieved a healing rate of 54% on day 3. Our findings underscore the substantial potential of the Janus wound dressings in promoting the healing of chronic diabetic wounds.
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