CELLULOSE
·
2022
·Vol. 29
·期 17
·9361-9374
·
IF 6.123
Jiang Liuyun,Jiang Zhihong,Ma Bingli,Ma Yingjun,Wen Yue,Zhang Na,Zhang Yan,Su Shengpei,Tang Xionggui,Hu Xiang
Nano-hydroxyapatite/bamboo fiber (n-HA/BF) composite membranes were obtained by a simple casting technology. The mechanism of the membrane formation and the effects of different pre-drying conditions, drying methods and n-HA addition amounts on the properties of the n-HA/BF composite membranes were investigated by Fourier Transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Scanning electron microscopy (SEM), contact angle, Electromechanical universal tester, in vitro soaking in simulated body fluid (SBF) and in vitro cell culture experiment. The results demonstrated that different preparation conditions did not affect the dispersity of n-HA nanoparticles in BF matrix, but determined the membrane appearances, owing to the different changes of hydrogen bond under different pre-drying temperatures. Moreover, the hydrophilicity of the composite membranes could be improved when the membranes were prepared at 70 °C and freeze-drying as well as n-HA high addition content, and the mechanical properties of the composite membranes depended on n-HA addition content. In vitro soaking behavior indicated that the corrosion properties and bone-like apatite deposition could be controlled by different preparation conditions. The cell proliferation results showed that the n-HA/BF composite membranes obtained in different preparation conditions were all non-toxic. The obtained results showed that the casting technique could be used to prepare n-HA/BF composite membranes, and the properties of the composite membranes could be controlled by adopting different preparation conditions, which would have a great potential for guide bone tissue regeneration (GBR) membranes, and the study would provide a new way for BF application in biomedical fields. Graphical abstract In this manuscript, nano-hydroxyapatite/BF (n-HA/BF) composite membranes were prepared by casting method, and the membrane forming mechanism and the effects of different pre-drying conditions, drying methods and n-HA amounts on the corresponding n-HA/BF membrane were investigated. Results demonstrated that the morphologies of membrane was determined by the different preparation conditions owing to different hydrogen bond changes. Moreover, the hydrophilicity, the mechanical properties, the degradability and bone-like apatite deposition could be controlled by different preparation conditions, and all the n-HA/BF composite membranes were all non-toxic. The obtained results indicated that the n-HA/BF composite membrane with 20% n-HA prepared at room temperature has a great potential as guide bone tissue regeneration (GBR) membrane, which would provide a new application for BF in biomedical field.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 7
·4666-4676
·
IF 3.553
Wang Pan,Tian Xuemin,Yan Meng,Yang Boxuan,Hua Zhongqiu
In this study, a catalytic-type combustible gas sensor was fabricated by the screen-printing method. Pt supported catalysts (Pt-HZSM5) were prepared by a wet impregnation method using HZSM5 zeolite as support. It was found that Pt-HZSM5 catalysts have a highly catalytic activity to H 2 and CO at low temperatures and a selectively and fully combustible was observed at only 150 °C. A good dispersion state of Pt nanoparticles on HZSM5 zeolite particles was beneficial for the catalytic oxidization of CO and H 2 . However, a high loading amounts lead to a poor dispersion state and a weak catalytic activity. The thick film sensor based on Pt-HZSM5 catalyst was found to be highly sensitive to combustible gas with a good linearity up to 2% and a limitation of detection (LOD) around 50 ppm. Due to the low operation temperature, a highly selectivity was obtained for CO and H 2 and no cross-sensitivity to interfering gases such as CH 4 and VOCs. It was indicated that the present developed catalytic-type gas sensors could be used for the leakage detection and monitor for H 2 and CO with a low power consumption and a good selectivity.
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高影响因子
ENVIRONMENTAL MONITORING AND ASSESSMENT
·
2020
·Vol. 192
·期 6
·1-11
·
IF 1.903
Zagui Guilherme Sgobbi,de Andrade Leonardo Neves,Moreira Natália Columbaro,Silva Thaís Vilela,Machado Gabriel Pinheiro,da Costa Darini Ana Lúcia,Segura-Muñoz Susana Inés
Multidrug resistance mediated by β-lactamase in Gram-negative bacilli is a serious public health problem. Sewers are considered reservoirs of multiresistant bacteria due to presence of antibiotics that select them and favor their dissemination. The present study evaluated the antibiotic resistance profile and β-lactamases production in Gram-negative bacilli isolates from hospital sewage and urban wastewater treatment plants (UWWTP) in Brazil. Bacteria were isolated and identified with biochemical tests. Antibiotic susceptibility testing was performed by the disk-diffusion method and detection of extended-spectrum β-lactamase and carbapenemases by enzymatic inhibitor and conventional PCR. Differences in resistance to amoxicillin clavulanic, aztreonam, cefepime, and cefotaxime were observed in hospital sewage compared with urban sewage ( p < 0.05). The multidrug-resistant phenotype was observed in 33.3% of hospital sewage isolates ( p = 0.0025). β-lactamases genes were found in 35.6% of isolates, with the most frequent being bla KPC and bla TEM (17.8%), and bla SHV and bla CTX-M (13.3% and 8.9%, respectively). The data obtained are relevant, since the bacteria detected are on the priority pathogens list from the World Health Organization and hospital sewage could be released untreated into the municipal collection system, which may favor the spread of resistance. Changes in hospital sewage discharge practices, as well as additional technologies regarding effluent disinfection in the UWWTP, can prevent the spread of these bacteria into the environment and negative impact on water resources.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 6
·4180-4196
·
IF 4.682
Yu Xiaohang,Dong Yanzeng,Jia Haining,Li Xin,Wang Zhiheng,Liu Yanyan,Gao Ruiyao,Yao Songdong
Multilayered, spatially ordered and highly permeable three-dimensional cross-network porous carbons were prepared from waste superabsorbent polymer (SAP) and were used as supports for NiMo hydrodesulfurization (HDS) catalysts. The acidified SAP-based carbon support and the corresponding catalyst were characterized by FT-IR, XRD, N 2 adsorption–desorption, NH 3 -TPD, TG, SEM, TEM, XPS and H 2 -TPR. The results show that the acidification of the SAP-based carbon support optimizes the pore structure, increases the acidic surface functional groups, enhances the interaction between the metal and the support, and significantly improves the catalytic hydrodesulfurization performance of the catalyst. Liquid phase acidification can produce defects and wrinkles on surfaces of carbon material and form interconnected voids on spongy catalyst. Further acidification with nitric acid vapor is helpful to form a three-dimensional cross-network structure with multilayer, spatial order and high permeability. Under the same metal Mo loading and high reaction temperature, HDS performance of DBT and 4,6-DMDBT of the NiMo catalyst supported on acidified SAP is better than that of the commercial NiMo catalyst. Graphical Abstract
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 36
·26788-26800
·
IF 2.779
Wang Renjie,Huang Aiwen,Yan JiaHui,Cheng Qiaohuan,Chen Qianqian,Yao Chenxue,Zhu He,He Fang,Miao Wei,Zhou Xuefei,Xu Sankui
Photocatalysts with different compositions have wide applications in the field of antibiotics degradation, especially for tetracycline hydrochloride (TC-HCl) degradation. One of the key pathways to improve their performance is by recombination of organic and metallic materials. In this innovative research, the composite photocatalyst PI/ZnO was successfully fabricated by one facile sintering process. The samples were characterized by scanning electron microscope (SEM), Fourier transforms infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The photocatalytic performance of the samples was studied by the UV–visible diffuse reflectance spectrum (DRS). The results showed that the visible-light photocatalytic performance for TC-HCl degradation of PI/ZnO composite was approximately 71.2-fold and 3.1-fold as high as that of pure PI and bare ZnO, respectively. In addition, the mechanism of the photocatalytic reaction was revealed by the radical quenching experiments.
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高影响因子
Nano-Micro Letters
·
2021
·Vol. 14
·期 1
·1-11
·
IF 16.419
Liu Shihao,Zang Chunxiu,Zhang Jiaming,Tian Shuang,Wu Yan,Shen Dong,Zhang Letian,Xie Wenfa,Lee Chun-Sing
Here, this work presents an air-stable ultrabright inverted organic light-emitting device (OLED) by using zinc ion-chelated polyethylenimine (PEI) as electron injection layer. The zinc chelation is demonstrated to increase the conductivity of the PEI by three orders of magnitude and passivate the polar amine groups. With these physicochemical properties, the inverted OLED shows a record-high external quantum efficiency of 10.0% at a high brightness of 45,610 cd m −2 and can deliver a maximum brightness of 121,865 cd m −2 . Besides, the inverted OLED is also demonstrated to possess an excellent air stability (humidity, 35%) with a half-brightness operating time of 541 h @ 1000 cd m −2 without any protection nor encapsulation.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2022
·Vol. 24
·期 12
·1-14
·
IF 2.533
Lu Junfeng,Li Donglin,Chen Xianjia,Peng Xiaolin,Li Jing,Yang Yanting,Hong Bo,Wang Xinqing,Jin Dingfeng,Jin Hongxiao
Here, we demonstrate room temperature NO 2 sensors based on ZnO/rGO nanocomposites by a facile hydrothermal method. The ZnO nanoparticles (20 ~ 50 nm) were wrapped by film-like rGO with different contents (0.5, 1.0, 2.0, 3.0 wt %). They all exhibit p-type sensing toward NO 2 at room temperature. The content of rGO shows an obvious effect on the sensing properties. The ZnO NPs-1% rGO has a high response of 5.21 to 10 ppm NO 2 with a response/recovery time of 198/144 s. The sensing mechanism is discussed. The gas-sensitive properties are derived from the strong synergistic effect between the smaller particles of ZnO and rGO.
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高影响因子
Food Analytical Methods
·
2022
·Vol. 15
·期 7
·2036-2047
·
IF 3.498
Gao Ming,Wang Hui,Wang Jun,Wang Xuedong,Wang Huili
Herein, we developed an effervescent reaction-enhanced dispersive liquid–liquid microextraction method for the preconcentration/extraction of bisphenols (BPs) in milk and milky tea samples. This microextraction method was based on the utilization of acidic ionic liquid (AIL) and in situ metathesis reaction (AI-EDLM). Compared to the traditional imidazolium-based ionic liquid, AIL can not only be used as an extractant, but also as an acidic source in the effervescent reaction. Under such a case, it can avoid the use of additional acidic source and also achieve a rapid dispersion effect due to vigorous CO 2 bubbles, which simplify the experimental procedures and decrease the preparation cost of effervescent tablets. By employing the one-factor-at-a-time approach, the main parameters were optimized as follows: 400 mg of [BMIM][HSO 4 ] as extractant, 100 mg of Na 2 CO 3 as alkaline source, 400 mg of Li[NTf] 2 as the ionic-exchange reagent, 4% of NaCl, 5 min of centrifugation and 1.5 mL of ether as the elution solvent. Under optimized conditions, the limits of detection ranged from 0.12 to 0.32 μg L −1 , and the extraction recoveries for BPA, BPB, and BPAF spanned the range of 85.7–106.2% in five kinds of milk samples. Therefore, the AIL ([BMIM][HSO 4 ]) played dual roles, i.e., extractant and pH regulator, in the AI-EDLM procedures. Overall, this proposed method is simple, quick, and environment-friendly with low detection limits and high recoveries for BPs, and thus has excellent application value in the sample pretreatment field in milk and milky tea samples.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 5
·3817-3824
·
IF 2.22
Xie Zhipeng,Zhou Yan,Guan Linlin,Muhammad Sajjad,Jiang Yuhan,Zhang Shuyu,Yu Chunxin,Jiao Yangjing,Zhang Shuangshuang,Ren Yang,Zhou Xiaowei,Liu Zhu
Effect of the impurity in Cu 2 O nanowire on the degradation of methyl orange under light irradiation in dark circumstances was investigated. Here, we present the fabrication of Cu 2 O nanowires at different temperatures (110, 130, 150, 170, and 190 °C) by a facile hydrothermal route. Meanwhile, at the synthesis temperature of 110–150 °C, the major impurity in Cu 2 O nanowires was Cu 4 O 3 , and a new Cu impurity was introduced in the Cu 2 O nanowires as the synthesis temperature increased from 170 to 190 °C. Overall, as the synthesis temperature increases from 110 to 190 °C, the total impurity decreases in Cu 2 O nanowires. The fast degradation rate in dark circumstances has been achieved in Cu 2 O nanowires for all synthesis temperatures, which can be attributed to the Cu 2+ in the Cu 4 O 3 impurity of Cu 2 O nanowires. This result shows that the Cu 2 O nanowires obtained at the synthesis temperature of 150 °C have the fastest degradation rate for both under light irradiation and in dark circumstances. It has been found that under light irradiation, the Cu impurity in Cu 2 O nanowires plays a vital role in the degradation of methyl orange. In the current scenario, different impurity contents influence the catalyst activity of Cu 2 O nanowires under the visible light or dark, respectively.
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高影响因子
IONICS
·
2024
·
IF 2.4
Niu Hongkun,Wang Cong,Gao Bingliang,Tan Qi,Liu Zhiwei,An Ruifeng
In aluminum electrolysis cells, the emissions of perfluorocarbons (PFCs) are not only associated with the high-voltage anode effect (cell voltage > 8 V), but continuous emissions of PFCs have also been detected during cell voltage below 8 V, especially in high-amperage prebake cells. These PFCs are referred to as low-voltage anode effect PFCs (LVAE-PFCs). In this study, the influence of current density on the formation of fluorocarbon (CF x ) film was investigated on an industrial carbon anode with a bottom area of 50 cm 2 in a high-temperature see-through aluminum electrolysis cell operating at 940 °C. The formation of CF x films on localized areas of the anode under normal electrolysis conditions was confirmed through observations. The quantity of peeled CF x films and the value of the back electromotive force gradually increase with increasing current density. Simultaneously, the thermal decomposition of the CF x films results in the generation of PFCs. Under conditions of sufficient alumina concentration, the peeling of the CF x films contributes to a reduction in the cell voltage. X-ray photoelectron spectroscopy analysis revealed that regions with high current density on the carbon anode provide favorable conditions for the formation of CF x components with high resistance characteristics, inevitably leading to an increase in cell voltage.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 2
·1186-1197
·
IF 4.682
Li Yana,Li Yuqiang,Ji Yi,Wang Hong,Zhong Dingyong
Ga 2 O 3 is considered as a candidate for the preparation of solar-blind photodetectors due to its large direct band gap. Developing low-cost preparation methods of high-quality Ga 2 O 3 films is of importance for large-scale applications. In this work, we investigate the preparation of Sn doped β-Ga 2 O 3 films by using simple and cheap sol–gel method under ambient condition. It is found that Sn doping induces a growth mode transformation from \(\left( {\overline{2}01} \right)\) to \(\left( {\overline{3}11} \right)\) oriented texture on the c-plane sapphire substrates. With an optimal Sn proportion, high-quality β-Ga 2 O 3 films consisting of needle-like grains are observed. Compared with the undoped films, the Sn-doped films with needle-like grains obtained a low dark current of 0.76 nA, performed an on/off ratio as high as ~ 6000, responsivity, R of 164 mA/W and D* of 3.21 × 10 12 Jones at a bias voltage of 30 V in the configuration of metal–semiconductor–metal solar-blind deep ultraviolet detectors. This is the highest on/off ratio of Ga 2 O 3 solar-blind photodetectors fabricated by sol–gel method reported up to now and has the potential to be applied in practical use. Graphical abstract
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高影响因子
PHARMACEUTICAL CHEMISTRY JOURNAL
·
2022
·Vol. 56
·期 3
·356-360
·
IF 1.063
Yang Meizhu,Lai Weihong,Li Junjian,Ye Lianbao
Phloroglucinols of Dryopteris fragrans (L.) Schott plant show strong antifungal activity. In previous work, we isolated a wide range of phloroglucinols from the plant and found that pseudoaspidinol of D. fragrans and its structural modifications (methylphloroglucinol derivatives) showed stronger antifungal activity and confirmed that the butyryl group of these compounds accounted for this activity. In this study, we designed a series of phloroglucinol derivatives ( A1–A9) and methylphloroglucinol derivatives ( B1–B9) by introducing acyl groups with diverse carbon numbers in the C-2 position, synthesized these compounds, and evaluated the anti-dermatophyte activity of compounds A1–A5 and B1–B5 on Trichophyton rubrum and Trichophyton mentagrophytes fungal species. The results showed that compound A5 exhibited the strongest activity. These compounds can be used as leads for the development of new antifungal agents.
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高影响因子
危险品化学品经营许可证（带存储）