ACS Applied Polymer Materials
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2020
·
IF 0
Dan Lv,Guosheng Tang,Long Chen,Mengjie Zhang,Jiaxin Cui,Ranhua Xiong,Chaobo Huang
Today, poor water and air quality caused by fine particulate matters (PMs), toxic spills, and antibiotic-containing wastewater are posing serious threats and risks to the environment and human health. Although many contaminant materials can be effectively removed by the traditional membrane technology, the simultaneous multifunctional materials like PM removal, oily water separation, and antibiotic adsorption are rarely reported. In addition, most of the membranes are destroyed when working in the harsh environment such as high temperatures, high pressures, strong acids and bases, and so on. In this work, a multifunctional Fe3O4@polyacrylonitrile/chitosan (Fe3O4@PAN/CS) membrane with robust stability and repeatable usage was fabricated via a simple and environment-friendly gas-spinning method; the obtained functional membrane is supposed to be applied in both air and liquid contaminant remediation. In comparison with the reported membranes, the multifunctional Fe3O4@PAN/CS composite nanofiber membranes not only have excellent performance in air filtration, antibiotic adsorption, or oil–water separation but also show robust reusability and durability even in harsh environments. Our strategy would bring ideas to the design and fabrication of multifunctional membranes for simultaneous environmental remediation such as air purification and wastewater treatment.
研究领域:
环境科学
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材料科学
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纳米技术
✓ 已验证
产品关联
DOI
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Yating Wang,Xiu Dai,Yixing Zhan,Xiaoqing Ding,Ming Wang,Xinlong Wang
The zeolitic imidazole framework (ZIF-8) dotted chitosan (CS) nanocomposites (ZIF-8@CS) were fabricated via in-situ growth method. The morphology, structure and chemical state of ZIF-8@CS were investigated by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), Fourier transform IR spectroscopy (FTIR) and X-ray diffraction (XRD). The adsorption behavior of ZIF-8@CS composites on Congo Red (CR) in aqueous solution was systematically investigated. The adsorption isotherm data showed that the adsorption of CR by ZIF-8@CS was single-layer adsorption, which was consistent with the Langmuir isotherm model. The maximum adsorption capacity of ZIF-8@CS was 922 mg/g. The kinetics parameters were in accord with pseudo-second-order equation, which implied that the adsorption rate was mainly controlled by the chemisorption mechanism. The removal of CR was attributed to the participation of hydrogen bonds , electrostatic interactions, π-π conjugation and zinc coordination effects.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLID STATE SCIENCES
·
2019
·
IF 2.155
Wei Li,Pengcheng Liu,Ruyue Niu,Jinping Li,Shuang Wang
Three CeO 2 supports with different concentration of surface oxygen vacancies were prepared by using C 12 H 29 NO (TPAOH), C 2 H 8 N 2 (EDA) and NaOH as precipitant under hydrothermal conditions, respectively. Catalytic experiments showed that the Ru/CeO 2 -TPAOH catalyst has superior catalytic activity (22000 μmol g −1 h −1 ) than Ru/CeO 2 -EDA (19000 μmol g −1 h −1 ) and Ru/CeO 2 –NaOH (16500 μmol g −1 h −1 ) at 450 °C, 3 MPa. In addition, the introduction of Cs and Ba promoters improve the catalytic activity of the Ru/CeO 2 -TPAOH. However, the introduction of K promoter inhibits the catalytic activity of the Ru/CeO 2 -TPAOH. The 4% Cs promoter can effectively increase the catalytic activity of the Ru/CeO 2 -TPAOH (32000 μmol g −1 h −1 ). BET and TEM indicated that 5.5 nm average pore size of CeO 2 -TPAOH support contributes to the dispersion of active metal Ru. XPS and CO 2 -TPD proved that the Ru/CeO 2 -TPAOH catalyst has higher Ce 3+ concentration, more oxygen vacancies, and higher basic site density, which are important factors for improving ammonia synthesis activity.
研究领域:
化学工程
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材料科学
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
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2020
·Vol. 31
·期 5
·1164-1171
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IF 2.578
Mengmeng Song,Meng Zhou,Hengfeng Hu,Heqing Fu
First, attapulgite-Fe 3 O 4 magnetic filler (ATP-Fe 3 O 4 ) was prepared by using a chemical precipitation method. Subsequently, graphite oxide (GO) was prepared through Hummer method, and then reduced GO (RGO) was prepared through GO reduced by chitosan (CS). Finally, a series of WPU-RGO/ATP-Fe 3 O 4 /CS composites were prepared by introduced RGO/ATP-Fe 3 O 4 /CS to waterborne polyurethane. The structure and properties were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR), X-ray diffraction (XRD), vibrating sample magnetometry (VSM), thermogravimetric analysis TGA, conductivity test, and tensile test. The experimental results indicated that thermal stability and tensile strength of nanocomposites were improved with the increase of the content of RGO/ATP-Fe 3 O 4 /CS. Meanwhile, with the increase of the RGO/ATP-Fe 3 O 4 /CS content, the electrical and magnetic properties of WPU-RGO/ATP-Fe 3 O 4 /CS composites were improved. When the content of RGO/ATP-Fe 3 O 4 /CS was 8 wt%, the electrical conductivity and the saturation magnetic strength of WPU-RGO/ATP-Fe 3 O 4 /CS composites were 3.1 × 10 −7 S·cm −1 and 1.38 emu/g, respectively. WPU-RGO/ATP-Fe 3 O 4 /CS composites have excellent electrical and magnetic properties.
研究领域:
材料科学
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纳米技术
✓ 已验证
DOI
高影响因子
Nanoscale
·
2013
·Vol. 5
·期 24
·12633-12644
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IF 6.233
Yun Zeng,Shaojuan Zhang,Menghui Jia,Yang Liu,Jin Shang,Youmin Guo,Jianhua Xu,Daocheng Wu
A new hypoxia-sensitive coordination compound, bis(2-(2′-benzothienyl)pyridinato-N,C3′)iridium[poly(n-butyl cyanoacrylate)], hereafter denoted as (btp)2Ir(PBCA), is synthesized and characterized by 13C nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy (FTIR). (btp)2Ir(PBCA)/chitosan [(btp)2Ir(PBCA)/CS] nanoparticles (NPs) with a core–shell structure are prepared by a two-step fabrication process. The size distributions of these NPs are measured with a Malvern size analyzer, and their morphology is observed by transmission electron microscopy (TEM). The functional groups on the surface are confirmed by FTIR. Phosphorescence spectra are obtained and lifetimes are determined with a spectrophotofluorometer and a time-correlated single photon counting (TCSPC) apparatus, respectively. HeLa and CT26 cell lines are used to examine the cytotoxicity by the MTT assay, as well as to determine the imaging capability of the samples in air and nitrogen atmospheres, respectively. Tumor-bearing mouse models of colon adenocarcinoma are used for tumor imaging in vivo, and the imaging effect is evaluated with a Maestro 2 fluorescence imaging system. Compared with the hypoxia-associated probe bis(2-(2′-benzothienyl)pyridinato-N,C3′)iridium(acetylacetonate) (BTP), the phosphorescence lifetime of (btp)2Ir(PBCA)/CS NPs significantly decreases, but the hypoxia-sensitivity increases after preparation of NPs. Apart from the significantly lower cytotoxicity, (btp)2Ir(PBCA)/CS NPs also enhance the tumor imaging effect by more than 10 times, maintaining the phosphorescence signal in tumor tissue for over 24 h and significantly decreasing the phosphorescence signal in normal tissue in vivo compared with the BTP probe.
研究领域:
生物医学工程
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肿瘤学
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
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2018
·
IF 5.158
Jie Lu,Qi Kang,Jianhong Xiao,Tao Wang,Ming Fang,Li Yu
Fabrications and applications of luminescent films have been an interesting and important challenge within the realm of academia and industry. Herein, a novel fluorescence-based strategy for the H 2 O 2 detection has been developed by fabrication of stabilized, thin, transparent, and luminescent films composed of europium-containing polyoxometalates (Eu-POM) and environmentally friendly chitosan (CS) via a facile solution casting approach. In comparison with pure Eu-POM, enhanced fluorescent properties are obtained from the as-prepared Eu-POM/CS films in terms of prolonged fluorescence lifetime and a remarkable fluorescent quenching effect in the presence of hydrogen peroxide (H 2 O 2 ). The fluorescence intensity of Eu-POM/CS films exhibits a linear correlation in response to the H 2 O 2 concentration over a wide range of 1.1–66 μM, with a detection limit of 0.11 μM. Furthermore, the fluorescent films display a high detection selectivity which are capable of differentiating hydrogen peroxide (H 2 O 2 ) from the interfering species, such as sugars, l -amino acids, and other metabolites. All these advances towards the development of Eu-POM/CS films open up new applications for luminescent films, but most importantly, they can help in the far-reaching technological implementations of a simple, cost-effective method for the detection of H 2 O 2 in many fields.
研究领域:
材料科学
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环境科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 6
·2102331
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IF 6.389
Beibei Zong,Jianguo Deng,Qing Sun,Zizhao Zhang,Xiangxin Meng,Bo Shen,Bonan Kang,S. Ravi P. Silva,Geyu Lu
After perovskite became a star material, research on perovskite solar cells (PSCs) became a hot topic and developed rapidly. Electron transport layers (ETLs) with high mobility, low-defect state, and suitable energy level arrangement dominate the development of planar heterojunction PSCs. In this work, the K + and Cs + doped composite SnO 2 ETL ( x mg KC-SnO 2 ) by a continuous spin-coating of the x mg Cs + @KOH and SnO 2 aqueous solution shows a substantial improvement in carries extraction, transport and collection properties, leading to the increased fill factor (FF) from 72.48% to 81.00% of the planar heterojunction PSCs, and finally the champion device average efficiency is 21.62%. Moreover, this work improves the interface contacts between ETL/Perovskite, as it reduces energy disorder and simultaneously promotes electron transport, charge extraction at the interface, improve energy level alignment and quasi-Fermi level splitting, and decreased resistance for charge transfer in the device. In conclusion, this simple and effective method of improving the FF value provides a certain shortcut to the performance of plane heterogeneous perovskite devices.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
STARCH-STARKE
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2021
·
IF 2.741
Qiujie Fang,Na Chen,Shan Hu,Sheng Hu,Jianfeng Ye,Xiaozhou Ye,Yun Wang
Some special oral drugs may cause adverse reactions and degrade in the stomach; therefore, it is necessary to develop a new generation of multifunctional drug delivery carries to deal with such issues. Herein, by polyelectrolyte composite method using KGM and CS as raw material, CKGM/CS/TPP/5-ASA microcapsules are prepared using 5-ASA as model drug, and then coated with an acid-resistant polyacrylic acid polymer layer. The size of CKGM/CS/TPP/5-ASA microcapsules is relatively uniform, with average particle size 1.78 ± 0.02 mm. The inner part of microcapsules has a core-shell three-dimensional network structure, and the 5-ASA embedded in the network is in its crystal form. The microcapsules exhibited good encapsulate properties, with 495.5 µg mg −1 drug loading amount and 82.3% encapsulation efficiency under optimized conditions. The in vitro release properties of microcapsules are also studied, and results showed that the drug is released little in Simulated Gastric Fluid solution (pH 1.2) but fully released in Simulated Colonic Fluid or Phosphate Buffered Solution (pH 7.0), and the release rate is higher in SCF solution, indicating that β-mannanase could facilitate release. All these results indicated that CKGM/CS/TPP microcapsules have good pH-controlled release, enzymatic release, and sustained release properties, hence they are promising multifunctional colon-targeted release carriers.
研究领域:
药学
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生物材料学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
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2023
·Vol. 11
·期 19
·2300572
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IF 9
Songcheng Peng,Luwei Chen,Lan Lu,Peng Zhang,Hongyu Wen,Shuangpeng Yan,Wei Wang,Yuanyuan Xiong,JinKang Lu,Jianbei Qiu,Jie Yu,Xue Yu,Xuhui Xu
X-ray time-lapse imaging allows for precise radiographic imaging of the item after X-ray has been terminated, which is important for simplifying legacy X-ray detectors and avoiding health hazards caused by ionizing radiation during the imaging process. However, the premature discharge of carriers from shallow traps at room temperature over time leads to the loss of imaging information, making an accurate representation of the recorded information to achieve accurate time-lapse imaging still a challenge. Here, it is demonstrated that monodispersed NaLuF 4 : Tb 3+ nanocrystals with the replacement of Na + by Cs + ions in the lattice matrix realize a superior X-ray time-lapse imaging. It is found that the incorporation of Cs + ions amplifies the deep trap storage capacity, which ensures the stable presence of carriers under thermal perturbation at room temperature. Imaging information with a spatial resolution of 12.0 lp mm −1 can be accurately represented even after the irradiation of the X-ray has been terminated for 192 h. X-ray time-lapse imaging not only allows accurate reading of long-term stored imaging information but also endows the visualization of X-ray imaging independent of the dangerous radiation, which will offer great opportunities for X-ray inspection on a larger scale.
研究领域:
材料科学
·
医学影像
·
放射学
✓ 已验证
产品关联
DOI
高影响因子
Biomedical Materials
·
2011
·Vol. 6
·期 5
·055008
·
IF 2.467
Yan Wei,Xuehui Zhang,Yu Song,Bing Han,Xiaoyang Hu,Xinzhi Wang,Yuanhua Lin,Xuliang Deng
In recent years, interest in magnetic biomimetic scaffolds for tissue engineering has increased considerably. The aim of this study is to develop magnetic biodegradable fibrous materials with potential use in bone regeneration. Magnetic biodegradable Fe3O4/chitosan (CS)/poly vinyl alcohol (PVA) nanofibrous membranes were achieved by electrospinning with average fiber diameters ranging from 230 to 380 nm and porosity of 83.9–85.1%. The influences of polymer concentration, applied voltage and Fe3O4 nanoparticles loading on the fabrication of nanofibers were investigated. The polymer concentration of 4.5 wt%, applied voltage of 20 kV and Fe3O4 nanoparticles loading of lower than 5 wt% could produce homogeneous, smooth and continuous Fe3O4/CS/PVA nanofibrous membranes. X-ray diffraction (XRD) data confirmed that the crystalline structure of the Fe3O4, CS and PVA were maintained during electrospinning process. Fourier transform infrared spectroscopy (FT-IR) demonstrated that the Fe3O4 loading up to 5 wt% did not change the functional groups of CS/PVA greatly. Transmission electron microscopy (TEM) showed islets of Fe3O4 nanoparticles evenly distributed in the fibers. Weak ferrimagnetic behaviors of membranes were revealed by vibrating sample magnetometer (VSM) test. Tensile test exhibited Young's modulus of membranes that were gradually enhanced with the increase of Fe3O4 nanoparticles loading, while ultimate tensile stress and ultimate strain were slightly reduced by Fe3O4 nanoparticles loading of 5%. Additionally, MG63 human osteoblast-like cells were seeded on the magnetic nanofibrous membranes to evaluate their bone biocompatibility. Cell growth dynamics according to MTT assay and scanning electron microscopy (SEM) observation exhibited good cell adhesion and proliferation, suggesting that this magnetic biodegradable Fe3O4/CS/PVA nanofibrous membranes can be one of promising biomaterials for facilitation of osteogenesis.
研究领域:
生物医学工程
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材料科学
·
组织工程
✓ 已验证
DOI
PubMed
高影响因子
FIBERS AND POLYMERS
·
2024
·
IF 2.2
Zhou Xinnan,Xin Binjie,Gao Di,Newton Md. All Amin
In the purification of oily wastewater, polyvinylidene fluoride (PVDF) nanofiber membranes have attracted widespread attention for their excellent water–oil separation performance. And chitosan (CS), as a natural polymeric alkaline polysaccharide containing many functional groups interacting with heavy metal ions, such as –NH 2 and –OH, has been widely used to treat heavy metal ions in wastewater. However, a few studies have been conducted on superhydrophilic and underwater hydrophobic PVDF composite membranes for the simultaneous removal of heavy metal ions and oil from wastewater. In this paper, PVDF/PVP composite membranes were used as the substrate of separation membranes, and PVDF/PVP-modified membranes were prepared by surface coating with PDA and CS in turn. Among them, CS can be coated on the surface of PVDF/PVP composite membrane by cross-linking the amino group on the molecule with the quinone structure in the PDA molecule to form a stable CS/PDA gel layer. Compared with other modified membranes, CS/PDA-PVDF/PVP has better hydrophilicity and underwater oleophobicity. The underwater OCA of dichloromethane could reach 161°, and the OCA of other oils were above 140°. The water flux was 14,171 L m −2 h −1 . After 15 mixture and emulsion separation tests, the separation efficiency was higher than 99% and 98%, respectively. The adsorption efficiency for Cu 2+ , Pb 2+ , and Cr 3+ aqueous solutions with concentrations of 10–60 mg/L reached more than 80%. Therefore, this method has great potential in treating oily wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2019
·
IF 4.153
Pifu Gong,Yi Yang,Fengguang You,Xinyuan Zhang,Gaomin Song,Shengzi Zhang,Qian Huang,Zheshuai Lin
The alkali metals Rb+ and Cs+ involving structural evolution from centrosymmetric (CS) to noncentrosymmetric (NCS) is investigated in the ASbF3Cl compounds. RbSbF3Cl crystallizes in the orthorhombic centrosymmetric space group of Pbca, whereas CsSbF3Cl crystallizes in the tetragonal noncentrosymmetric space group of I4̅2m, although they both consist of [SbF3Cl2] units and alkali metal cations. The CS to NCS evolution is originated from the structural dimensional reduction owing to the accommodation of the relatively larger alkali metal cations. RbSbF3Cl and CsSbF3Cl are stable under 195 and 205 °C, respectively, and their energy band gaps are about 3.30 and 3.05 eV. Powder second harmonic generation (SHG) measurements show that CsSbF3Cl is phase-matchable with a response of 0.3 times that of KH2PO4. Moreover, first-principles calculations are performed to investigate the origin of SHG effects in CsSbF3Cl.
研究领域:
无机化学
·
材料科学
·
晶体学
·
非线性光学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）