CRYSTENGCOMM
·
2018
·Vol. 20
·期 41
·6580-6588
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IF 3.304
Pengwei Li,Dingding Li,Lina Liu,Anli Li,Cuixian Luo,Yue Xiao,Jie Hu,Huabei Jiang,Wendong Zhang
In this work, a concave structure of Cu2O truncated microcubes with {100} facet erosion has been successfully synthesized by a facile top-down etching method. Air and PVP were employed as an etchant and a shape controller agent, respectively. For the facet-selective capping of PVP on Cu2O {111} planes, the traditional relatively low energy {100} facets of Cu2O truncated microcubes would be selectively etched along their [100] zone axis in a top-down manner. The {100} facet etched Cu2O concave truncated microcubes exhibited highly improved photocatalytic activities (2.15 and 1.21 times, respectively) compared to that of the basic structure and the {111} facet etched samples on the degradation of Congo red (CR), displaying distinct facet-dependent photocatalytic characteristics, excellent stability and reusability. This work not only builds an efficient photocatalyst, but also provides a novel method to fabricate a variety of architectures with low energy facets etched and highly active crystal planes exposed, which is extremely important for the improvement of catalytic activities.
研究领域:
材料科学
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化学工程
·
环境科学
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DOI
高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 23
·8086-8093
·
IF 5.721
Haoxi Jiang,Debin Kong,Ying Niu,Sheng Wang
MnO2–CoOX catalysts with different Mn/Co ratios were prepared using polyvinyl pyrrolidone (PVP) as an assistant to control the morphology and exposed crystal faces of composite oxides. The physicochemical properties of the catalysts were systematically characterized and the catalytic activity of NH3-SCR and resistance to SO2/H2O were investigated. It was found that the NO conversion over Mn–Co-0.2-PVP was apparently higher compared with that over Mn–Co-X-PVP (X = 0.9, 0.8, 0.6, and 0.4). This can be interpreted in terms of exposed crystal surface (110) and enhanced adsorption of NH3/NO, and better redox performance resulting from higher Co3+/Co2+ ratio. Furthermore, different PVP and HAc additives have different H2O and SO2 resistance. Mn–Co-0.2-PVP showed good resistance to H2O and SO2 poisoning owing to having more low-temperature (∼200 °C) NO adsorption sites, which are beneficial to promote the de-NOX reaction and less affected by SO2.
研究领域:
环境科学
·
催化材料
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Anran Zhou,Ruibao Jia,Yonglei Wang,Shaohua Sun,Xiaodong Xin,Mingquan Wang,Qinghua Zhao,Huanhuan Zhu
The technique of coupling photocatalysis and membrane filtration was applied to the abatement of sulfonamide antibiotics in water. TiO 2 photocatalyst has been aroused widespread concern in recent years due to its low price and easy availability. A PVDF-PVP-TiO 2 -Dopamine blend ultrafiltration membrane (PPTD) was first fabricated in this study and removal of sulfadiazine (SD) in water using a PPTD membrane filtration-photocatalysis system was realized. The addition of PVP-TiO 2 -Dopamine increased the porosity and average pore size of membranes, resulting in improved hydrophilicity, flux of modified membranes. In pure water, the SD removal efficiency was 91.4% with a first-order rate constant k 0.0216 min −1 under the optimum conditions ([SD] 0 = 0.4 µmol/L, UV = 125 µW/cm 2 , pH = 7.5 ± 0.1, t = 2 h). Water quality parameters (NO 3 − , Cl − , SO 4 2− , humic acid (HA)) showed quite different effects on SD decontamination. Simulated degradation experiments using real samples demonstrated that PPTD membrane filtration-photocatalysis system has significant potential with regard to controlling SD as pollutants in water. The photocatalytic mechanism characterized using ESR indicated that OH was largely responsible for SD decontamination. The mechanism of the PPTD membrane filtration-photocatalysis system suggests that TiO 2 -Dopamine could exist synergistically through the bidentate structure or the chelated structure, and that OH, O 2 − , HO 2 , H 2 O 2 and 1 O 2 may be produced in the PPTD membrane filtration-photocatalysis system.
研究领域:
环境科学
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材料科学
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生物学
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DOI
高影响因子
Catalysis Science & Technology
·
2022
·Vol. 12
·期 22
·6771-6781
·
IF 6.177
Lianghai Xia,Lingdong Kong,Jie Tan,Yuwen Wang,Shengyan Jin,Chao Wang
BiOBr can degrade pollutants under visible light, and it is a new star in the field of photocatalysis. However, its practical application still faces great challenges, and it still needs to be designed and modified to obtain high catalytic performance for efficient degradation of organic pollutants. Herein, we have realized the simple preparation and efficient catalysis of a BiOBr composite catalyst. This catalyst combines the dual effects of stable adsorption and efficient degradation. This spherical catalyst is composed of surfactant PVP and BiOBr and has higher photocatalytic efficiency. It is found that PVP on the surface of BiOBr firmly adsorbs 2,4-dichlorophenol on the surface of the catalyst, and the petal like microsphere structure makes full use of light energy to achieve high-efficiency photocatalysis. The catalytic effect of the composite catalyst is 1.53 times higher than that of the pure BiOBr catalyst. This study will help us better understand the comprehensive effects of adsorption and degradation of surfactants and catalytic materials, and develop new and reliable green photocatalysts.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Surfaces and Interfaces
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2021
·
IF 4.837
Ying Wang,Yuezhou Liu,Yongfang Qian,Lihua Lv,Xiyue Li,Yanjing Liu
In this work, the antibacterial nanofibers of MgO/PCL/PVP (MCV) used for tissue engineering materials were prepared using PCL/PVP (CV) as nanofiber substrates and magnesium oxide nanoparticles (MgONPs) as antibacterial agents by electrospinning technology. The suitable CV substrates with excellent microscopic morphology and small average diameter of 208.5 ± 74.9 nm were prepared by electrospinning the mixture of PCL and PVP with the mass ratio of 1: 1. The MCV antibacterial nanofibers were successfully fabricated by loading MgONPs onto the suitable CV substrates by electrospinning process. In addition, the characterizations including scanning electron microscopy (SEM), energy dispersive X-ray spectrometer (EDS), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and attenuated total reflection fourier transform infrared spectroscopy (ATR-FTIR) indicated that 3.0 wt% MgONPs were physically and evenly loaded onto the CV substrates (MCV-3.0), which presented an excellent antibacterial rate of 100% against Escherichia coli ( E. coli ).
研究领域:
生物材料学
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组织工程学
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医学
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DOI
高影响因子
Journal of Materials Chemistry B
·
2022
·Vol. 10
·期 41
·8514-8524
·
IF 7.571
Qi Xu,Jiarui Wu,Yiming Feng,Han Hu,Zhimin Mo,Zushun Xu,Hewei Li,Shengli Yang
Sonodynamic therapy (SDT) is a non-invasive treatment, preferred by many researchers. Ultrasound is applied to tumor lesions, enriched with a sound sensitizer. The activation of the sound sensitizer produces reactive oxygen species (ROS), which kill the tumor cells. In this study, raspberry-like AgBiS2@PVP nanoparticles (NPs) were prepared, which were modified with polyvinylpyrrolidone (PVP). Finally, AgBiS2@PVP NPs with 261 nm diameter and a suitable band gap were successfully synthesized. These NPs could play a role in SDT by generating ROS when induced by ultrasonic stimulation. Moreover, the AgBiS2@PVP NPs could also catalyze H2O2 in the tumor microenvironment to produce ˙OH, equipping the NPs with chemodynamic therapy (CDT) properties. In vivo and in vitro experiments suggested that, compared to the single treatments, the combination of SDT and CDT had a clearer inhibitory effect on tumor cells.
研究领域:
纳米技术
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癌症治疗
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材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
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2017
·
IF 1.9
Jinku Xu,Peili Zhao,Yongchun Zhang
Swollen hydrogels with extended iodine release kinetics is highly desirable for burn and scald treatment. In this paper semi-interpenetrating poly (HEMA–PVP) hydrogels were prepared by radical polymerization followed by thermo-treatment to crosslink its PVP component. Incorporation of PVP component endows the hydrogels responsive to loaded iodine undergoing a reversible shrunken/swollen volume transition. This resulted in a self-regulating iodine release model, in which shrunken hydrogel at high iodine loading decreased drug diffusion thereby reducing burst release, and then gradually swollen hydrogel as drug release ensures rapid release of dissociated drug from strong affinity sites on hydrogel backbone, achieving a burst-free extended release. The hydrogels demonstrated 11.5-fold higher iodine loading than pure pHEMA hydrogel and showed a highest 40% volume shrink. Initial burst release of iodine was efficiently decreased from 12,894 μg/day of pure pHEMA hydrogel to 2570 μg/day of pHEMA/PVP hydrogel with 37% PVP content. Iodine-loaded hydrogels showed zero-order release at three time periods of 0–15 h, 15 h–3.5 days and 3.5–23.5 days corresponding to release rate of 2570, 776 and 493 μg/day. The work gained a new insight into swollen hydrogel drug delivery system with burst-free extended drug release kinetics.
研究领域:
材料科学
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药学
·
生物医学工程
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DOI
PubMed
高影响因子
MATERIALS LETTERS
·
2022
·
IF 3.574
Liping Liu,Ting Li,Maolei Sun,Wenyuan Jia,Kun Jiao,Shaoru Wang,Yun Liu,Kongzhao Jiang,Yuheng Yang,Zhihui Dai,Changli Xia,Zhiqiang Cheng,Guomin Liu,Yungang Luo
Temperature-controlled shrinkage polytrimethylene carbonate (PTMC)/polyvinylpyrrolidone (PVP) core–shell nanofibrous membranes were successfully prepared by uniaxial electrospinning to accelerate wound closure. The characterization and temperature-controlled shrinkage of the PTMC/PVP nanofibrous membranes were investigated. The results showed that the PTMC/PVP core–shell nanofibers had a periodic distribution of porous spindle-knotted structure, and EDS elemental mapping of N elements indicated the core–shell structure with PTMC shell and PVP core. The PTMC/PVP (1:3) nanofibrous membrane had the maximum shrinkage in PBS for 120 min, which area percentage were decreased to 68.0% at 20 °C and 49.4% at 37 °C. The results indicated that the PTMC/PVP nanofibrous membranes shrinkage would be increased with the temperature increased. Further experiments confirmed the PTMC/PVP (1:3) nanofibrous membrane could reduce the wound area of rat skin to approximately 70% in 30 min.
研究领域:
生物材料学
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医学工程
·
组织工程
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Zaihua Duan,Min Xu,Tingshuai Li,Yong Zhang,Hefeng Zou
La 0.7 Sr 0.3 MnO 3 (LSMO) nanocrystals were prepared by polyvinylpyrrolidone (PVP)-assisted sol-gel method and characterized by a variety of characterization techniques. The humidity sensor based on LSMO nanocrystals was fabricated and its humidity sensing properties were investigated at room temperature (25 °C) within the relative humidity (RH) range of 11–95%. The optimum working frequency of the LSMO humidity sensor was 10 Hz and the impedance variation was about four orders of magnitude within the whole humidity range from 11% to 95% RH. The LSMO humidity sensor was of super-fast response speed, which was only about 0.8 s from 11% to 95% RH at 10 Hz. The super-fast response property may be ascribed to the strong hydrophilicity of LSMO nanocrystals. In addition, the LSMO humidity sensor was of good reproducibility, stability, small humidity hysteresis (4% RH at 75% RH) and a fast recovery speed (∼4.9 s). These results indicate the LSMO nanocrystals can be used as a novel humidity sensing material to fabricate high performances humidity sensors.
研究领域:
材料科学
·
传感器技术
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Fei Bi,Zhemei Zheng,Rongrong Li,Ruiying Du,Li Zhao,Shanshan Xiao,Liyan Wang,Xiangting Dong
Photocatalytic composite membranes (BPMs) are preferred materials for wastewater treatment due to their high photocatalytic activity and ease of recovery. However, conventional blending modification methods for preparing BPMs often lead to drawbacks such as uneven distribution of photocatalysts, low loading efficiency, facile detachment of photocatalysts, poor reusability, and a limited specific surface area of the membranes. These issues significantly diminish their photocatalytic activity and restrict their practical applications. To address these challenges, this thesis introduces a novel preparation method for PVP-modified PVDF/BiOBr photocatalytic membranes, using a combination of electrospinning and solvothermal techniques. This approach enhances the stability of BiOBr microspheres on the PVDF nanofiber membranes, effectively tackling the issue of loading powder photocatalysts. These membranes, composed of PVDF nanofibers and uniformly sized BiOBr microspheres, exhibit a significant specific surface area of 15.69 m 2 /g. The modified PVDF/BiOBr photocatalytic membranes demonstrate remarkable degradation efficiencies: 100 % degradation of Rhodamine B (RhB) in 25 min, 93.8 % degradation of tetracycline (TC) in 30 min, and 74.6 % degradation of hexavalent chromium ions (Cr 6+ ) in 60 min. Moreover, after five cyclic experiments, the photocatalytic degradation rate of sample M 3 remains above 99 % with a minimal loss rate of only 0.5 %. The method developed for preparing PVDF/BiOBr photocatalytic membranes represents a universally applicable and straightforward strategy for fabricating advanced membrane materials. This preparation technique not only provides innovative design ideas and fabrication methods for new photocatalytic materials but also extends to other functional materials. The PVDF/BiOBr photocatalytic membrane materials hold great promise in offering technical and theoretical support for photocatalytic wastewater treatment.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Nanoscale Research Letters
·
2021
·Vol. 16
·期 1
·1-10
·
IF 4.703
Xie Jun,Zhou Zonglang,Ma Sihan,Luo Xian,Liu Jiajing,Wang Shengyu,Chen Yuqiang,Yan Jianghua,Luo Fanghong
X-ray computed tomography (CT) has been widely used in clinical practice, and contrast agents such as Iohexol are often used to enhance the contrast of CT imaging between normal and diseased tissue. However, such contrast agents can have some toxicity. Thus, new CT contrast agents are urgently needed. Owing to the high atomic number ( Z = 83), low cost, good biological safety, and great X-ray attenuation property (5.74 cm 2 kg −1 at 100 keV), bismuth has gained great interest from researchers in the field of nano-sized CT contrast agents. Here, we synthesized BiF 3 : Ln@PVP nanoparticles (NPs) with an average particle size of about 380 nm. After coating them with polyvinylpyrrolidone (PVP), the BiF 3 : Ln@PVP NPs possessed good stability and great biocompatibility. Meanwhile, compared with the clinical contrast agent Iohexol, BiF 3 : Ln@PVP NPs showed superior in vitro CT imaging contrast. Subsequently, after in situ injection with BiF 3 : Ln@PVP NPs, the CT value of the tumor site after the injection was significantly higher than that before the injection (the CT value of the pre-injection and post-injection was 48.9 HU and 194.58 HU, respectively). The morphology of the gastrointestinal (GI) tract can be clearly observed over time after oral administration of BiF 3 : Ln@PVP NPs. Finally, the BiF 3 : Ln@PVP NPs were completely discharged from the GI tract of mice within 48 h of oral administration with no obvious damage to the GI tract. In summary, our easily synthesized BiF 3 : Ln@PVP NPs can be used as a potential clinical contrast agent and may have broad application prospects in CT imaging.
研究领域:
医学影像学
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材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2017
·
IF 3.473
Yuan Zhao,Xuan Yang,Linyan Cui,Yali Sun,Qijun Song
Mercury ions (Hg 2+ ) and silver ions (Ag + ) are assigned to the highest toxicity class of heavy metal pollution. Here, a novel sensor is firstly developed for the simultaneous detection of coexisting Ag + and Hg 2+ in aqueous solution, depending on the catalytic properties of poly(vinyl pyrrolidone) (PVP)-capped platinum nanoparticle (Pt NPs) and the strong chelation of EDTA to Hg 2+ . PVP-capped Pt NPs exhibit uniform morphology and possess great intrinsic peroxidase-like activity in comparison to citrate-capped Pt NPs, PVP-capped Ru NPs and Ir NPs, attributing to the enhanced catalytic efficiency determined by loosely packed PVP and the excellent catalytic decomposition activities of H 2 O 2 . Hg 2+ and Ag + could induce remarkable inhibition of the peroxidase-like activity of Pt NPs by changing the electronic state of the active sites through metallophilic interactions. The selective and simultaneous detection of Hg 2+ and Ag + was realized via the addition of ethylenediaminetetraacetate (EDTA), which could successfully mask Hg 2+ but had negligible effect on Ag + . The proposed approach inspires new designs of novel catalytic nanoprobes for the multi-analyte assay of heavy metal ions .
研究领域:
分析化学
·
环境科学
·
纳米技术
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DOI
高影响因子
危险品化学品经营许可证（带存储）