JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Ruzhen Xie,Yanbin Jiang,Andac Armutlulu,Ziye Shen,Bo Lai,Hui Wang
In this work, cost-effective, magnetic carbon-supported Fe@Ti composite (Fe@Ti/Cs) with abundant active sites was synthesized by one-step carbothermal reduction of ilmenite with the assistance of microwave oven and utilized as a highly efficient persulfate (PS) activator for the wastewater purification. The coexistence of Fe 0/2+/3+ , Ti 3+/4+ and oxygen vacancies on Fe@Ti/Cs was found to favor for the electron transfer to PS, which facilitate the generation of reactive oxygen species (ROS). Catalytic experiment results showed that the Fe@Ti/C-4 produced from ilmenite/carbon with a mass ratio of 4:1 exhibited the best catalytic activation performance towards PS for the degradation of Rhodamine B (RhB). Usage of merely 0.12 g/L Fe@Ti/C-4 enabled the removal of 94.01% RhB (200 mg/L) within 30 min in the PS containing system, significantly outperforming ilmenite + PS (29.29%) and carbon + PS (49.91%) systems tested under the same conditions. The physico-chemical properties of the produced Fe@Ti/Cs before and after the reaction were carefully characterized. Radical scavenging experiments and electron paramagnetic resonance (EPR) analysis were carried out to better understand the underlying mechanism. The results indicate that oxygen vacancies in Fe@Ti/C-4 promoted the electron transfer and participated in the transition metal redox cycle to generate ROS in the PS-containing system, which was highly efficient for degrading RhB into small molecules and finally enabling mineralization. This work offers a new perspective for designing highly efficient and stable PS activators with long life derived from natural ore for environmental remediation.
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高影响因子
BIOMATERIALS
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2020
·
IF 10.317
Zhijian Yang,Yue Xi,Jun Bai,Zhiwei Jiang,Shuqin Wang,Haolan Zhang,Wei Dai,Chaozhen Chen,Zhongru Gou,Guoli Yang,Changyou Gao
The dual functional implants of antibacteria and osteointegration are highly demanded in orthopedic and dentistry, especially for patients who suffer from diabetes or osteoporosis simultaneously. However, there is lack of the facile and robust method to produce clinically applicable implants with this dual function although coatings possessing single function have been extensively developed. Herein, hyperbranched poly-L-lysine (HBPL) polymers were covalently immobilized onto the alkali-heat treated titanium (Ti) substrates and implants by using 3-glycidyloxypropyltrimethoxysilane (GPTMS) as the coupling agent, which displayed excellent antibacterial activity against S. aureus and E. coli with an efficiency as high as 89.4% and 92.2% in vitro , respectively. The HBPL coating also significantly promoted the adhesion, spreading, proliferation and osteogenic differentiation of MC3T3-E1 cells in vitro . Furthermore, the results of a S. aureus infection rat model in vivo ulteriorly verified that the HBPL-modified screws had good antibacterial and anti-inflammatory abilities at an early stage of implantation and better osteointegration compared with the control Ti screws.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2020
·
IF 3.442
Hui Yong,Xin Wei,Yanhao Wang,Shihai Guo,Zeming Yuan,Yan Qi,Dongliang Zhao,Yanghuan Zhang
To improve hydrogen storage property of Mg-based alloy, the Mg–Ce–Y–Ni + 10 wt % M (M = Zr, Ti, V) composites were prepared by the combination of alloying and ball-milling, and their microstructure, phase evolution, as well as hydrogen storage thermodynamic and kinetic properties, were investigated by XRD , PCT, and DSC methods. The result shows that the hydrogenated samples are composed of MgH 2 , Mg 2 NiH 4 and corresponding ZrH 2 , TiH 2 and VH 1.9 phases. In comparison, the |Δ H| value of M = Ti sample is larger than that of M = Zr and M = V samples, and the M = Ti sample has the highest the peak temperatures and lowest plateau pressure, which indicates that Zr and V elements are more efficient to reduce the thermodynamic stability of RE-Mg-Ni hydrogen storage alloys. Besides, the DSC curve of the M = V sample has another endothermic peak which corresponds to the decomposition reaction between VH 1.9 and VH 0.8 , which has a contribution to desorption kinetic property for the M = V sample. The apparent activation energies ( E de ) show an increasing trend in the following order: M = Zr (87.7 kJ/mol) < M = V (89.1 kJ/mol) < M = Ti (99.3 kJ/mol).
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2021
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IF 8.067
Lianbo Wang,Shilong Xing,Zizhen Shen,Huabing Liu,Chuanhai Jiang,Vincent Ji,Yuantao Zhao
In current work, Ni-Ti-CeO 2 nanocomposite coatings were achieved by co-adding Ti microparticles and CeO 2 nanoparticles. Designed experiments and COMSOL computer simulation were applied to reveal the synergistic role of Ti microparticles and CeO 2 nanoparticles in tailoring the spatial microstructures and properties of Ni-Ti-CeO 2 nanocomposite coating. Unilaterally, the conductive Ti microparticles conducted the growth behavior of Ni grains by current density concentration, distorting electronic field lines and heterogeneous nucleation. Individual domains consisting of inner nanograins and outer radial columnar grains surrounded Ti microparticles, where Ti microparticles acted as seeds. Ti microparticles tended to be aggregated, leading to spatial heterogeneity of microstructures. Ni deposits buried the Ti microparticles in forms of “covering model”, contributing to the formation of inside voids and rough surface and aggregation of Ti microparticles; on the other hand, the non-conductive CeO 2 microparticles hardly changed the distribution of current density and electronic field lines on the cathode surface. Ni deposits buried the CeO 2 microparticle in forms of “stacking model”, avoiding the inside voids and aggregation of particles. The incorporation of CeO 2 microparticle brought in microstructure evolutions only on its top side without disturbing the growth behavior of Ni grains on its lateral side or bottom, suggesting the limited effects. This was correlated with the presence of current concentration above the CeO 2 microparticle at the last stage of burying CeO 2 microparticle. The co-addition of Ti microparticles and CeO 2 nanoparticles into Ni deposits exploited the complementary action of the two particles, which gave birth to satisfied spatial microstructures and improved hardness. Ti microparticles took major responsibility for microstructure evolutions, while the CeO 2 nanoparticles were mainly in charge of the microstructure homogeneity.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Jie Zhao,Bingzhang Li,Zongyang Liu,Danling Dai,Yuqi Li,Ronghui Shi,Hui Zhang
Sodium alginate (SA) aerogels have shown outstanding potential as regenerative adsorbent materials in the field of wastewater purification. Although SA aerogel adsorption has been demonstrated as a simple and resultful method for removing dyes, it has the limitation that it only transfers or concentrates dyes on the adsorbate, and does not actually degrade them. In this study, a three-dimensional (3D) MIL-125/g-C 3 N 4 /SA (CNTi-125@SA) composite aerogel with visible light photocatalytic activity was achieved for photocatalytic degradation of organic dyes, via in-situ growth, blending and freeze-drying strategy. The results demonstrate that CNTi-125@SA has high catalytic activity for the dyes rhodamine B (RhB), methylene blue (MB) and methyl orange (MO), and the degradation rate can reach up to 99.23%. Impressively, the composite aerogel exhibits excellent antibacterial ability, and the antibacterial rate can reach up to 100% against E. coli . In addition, the developed composite aerogel has excellent reusability and stability, and the degradation efficiency can still reach 85% after seven repeated tests. Owing to their high catalytic activity, excellent antibacterial properties and stability, the CNTi-125@SA composite aerogel can be potentially used in a wide range of dye wastewater purification.
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高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 17
·9335-9348
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IF 3.917
Yang Yingying,Huang Wei,Guo Zengpei,Zhang Shiyu,Wu Feng,Huang Jingjing,Yang Hongjun,Zhou Yingshan,Xu Weilin,Gu Shaojin
Abstract Superhydrophobic cotton fabrics with improved ultraviolet resistance were prepared via in situ growing NH 2 -MIL-125(Ti)(Ti-MOF) nanoparticles on cotton fibers and subsequently coating with polydimethylsiloxane (PDMS) under room temperature. The synergetic effect of Ti-MOFs nanoparticles and PDMS was critical and essential for obtaining a superhydrophobic coating with anti-UV property. The surface microstructure, chemical composition, and superhydrophobic property of the as-prepared fabrics were characterized by K/S value, scanning electron microscopy, X-ray photoelectron spectroscopy, energy dispersive spectroscopy, and water contact angle (WCA) measurements. The as-prepared cotton fabrics not merely exhibited desirable superhydrophobic property with a water contact angle (WCA) of 154.7 ± 0.7° and a sliding angle of 3.6°, but also displayed the considerable UV resistance. The oil–water separation, stability of UV protection and superhydrophobicity were also investigated. The superhydrophobicity, anti-ultraviolet property, and K/S value of as-prepared PDMS/Ti-MOFs@cotton fabrics were stable after 300 cycles of abrasion and 5 cycles of washing. The facile synthesis technique provided a simple method for scalable construction of multifunctional fabrics. Graphic abstract
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JOURNAL OF ORGANOMETALLIC CHEMISTRY
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2019
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IF 2.066
Yi Zhou,Xuelian He,Ting Fu,Ning Zhao,Boping Liu
A series of novel Cr/Ti bimetallic polyethylene catalysts were successfully synthesized for the first time through introduction of chromium species into the (SiO 2 /MgR 2 /MgCl 2 )·TiCl x Ziegler-Natta catalysts. The bimetallic catalysts , which showed high activity, were simply prepared by refluxing titanium choloride with chromium modified silica gel/alkyl Mg adducts. Moreover, the effects of chromium content and calcination temperature were investigated in detail. The results obtained in the study were used to systematically discuss a clear relationship between the catalyst preparation condition and the relative performance of different metal active centers. Factors including surface hydroxyl content, catalyst performance in homo-polymerization, ethylene/1-hexene copolymerization were systematic investigated. Comparably, the chromium modified catalyst shows catalytic performance with 89% higher activity, 41.5% higher hydrogen response and 46.3% higher 1-hexene incorporation than the original (SiO 2 /MgR 2 /MgCl 2 )·TiCl x Ziegler-Natta catalyst. A new schematic model was proposed to explain the accelerated activation process of the bimetallic catalysts with kinetic and SEM results: chromium active sites on the outer surface of support react 10 times quicker than Ti active sites initially and help to crack the catalyst particle in the first stage; then the released inner surface active sites start to accelerate the polymerization reaction in the second stage.
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RSC Advances
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2018
·Vol. 8
·期 25
·13933-13944
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IF 2.936
Kui Yang,Hui Lin,Shangtao Liang,Ruzhen Xie,Sihao Lv,Junfeng Niu,Jie Chen,Yongyou Hu
Tubular porous Ti/SnO2–Sb filters with excellent penetration flux (∼61.94 m3 m−2 h−1 bar−1) and electrochemical activity were prepared by a sol–gel method using low-cost porous titanium filters as the substrates. The porous Ti/SnO2–Sb filters were used as anodic reactive electrochemical membranes to develop reactive electrochemical filter systems, by combining membrane filtration technology with the electrooxidation process, for water treatment. A convection-enhanced rate constant of 4.35 × 10−4 m s−1 was achieved for Fe(CN)64− oxidation, which approached the kinetic limit and is the highest reported in an electrochemical system. The electrooxidative performance of the reactive electrochemical filter system was evaluated with 50 mg L−1 rhodamine B (RhB). The results showed that the reactive electrochemical filter system in flow-through mode resulted in an 8.6-fold enhancement in RhB oxidation as compared to those in flow-by mode under the same experimental conditions. A normalized rate constant of 5.76 × 10−4 m s−1 for RhB oxidation was observed at an anode potential of 3.04 V vs. SCE, which is much higher than that observed in a reactive electrochemical filter system with carbon nanotubes and/or Ti4O7 (1.7 × 10−5–1.4 × 10−4 m s−1). The electrical energy per order degradation (EE/O) for RhB was as low as 0.28 kW h m−3 in flow-through mode, with a relatively short residence time of 9.8 min. The overall mineralization current efficiency (MCE) was calculated to be 83.6% with ∼99% RhB removal and ∼51% TOC removal. These results illustrate that this reactive electrochemical filter system is expected to be a promising method for water treatment.
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高影响因子
Small
·
2019
·Vol. 15
·期 31
·1901617
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IF 10.856
Xiyu Li,Qin Zou,Yi Man,Wei Li
To solve the clinical challenges presented by the long-term tracking of implanted hydroxyapatite (HA) bone repair material and to investigate the synergistic effects of superparamagnetic HA and a static magnetic field (SMF) on the promotion of osteogenesis, herein a new type of superparamagnetic/upconversion-generating HA material (HYH-Fe) is developed via a two-step doping method, as well as a specially-designed titanium implant with a built-in magnet to provide a local static magnetic field in vivo. The results show that the prepared HYH-Fe material maintains the crystal structure of HA and exhibits good cytocompatibility. The combined use of the superparamagnetic HYH-Fe material and SMF can effectively and synergistically promote osteogenesis/osteointegration surrounding the Ti implants. In addition, the HYH-Fe material exhibits distinct advantages in terms of both long-term fluorescence tracking and microcomputed tomography (micro-CT) tracking. The new material and tracking strategy in this study provide scientific feasibility and will have important clinical value for long-term tracking and evaluation of implanted materials and the bone repair effect.
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JOURNAL OF POWER SOURCES
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2013
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IF 4.675
Hong Tao,Guo-jia Fang,Wei-jun Ke,Wei Zeng,Jing Wang
In this paper, we explore a two-step treatment method to modify the Ti wires which are used as anode substrates of fiber dye sensitized solar cells (FDSSCs). A special kind of network nanoporous structure is formed on the surface of Ti wire substrates through sodium hydroxide hydrothermal reaction and titanium tetrachloride (TiCl 4 ) assistant treatment. Nanoporous structures with different sizes are in-situ grown on the Ti wire substrates by changing the hydrothermal reaction condition. Then, TiO 2 network nanoporous structures with branch-like nano-structure or 2D nanoflakes are obtained after TiCl 4 treatment. The effects of these network nanoporous structures on the FDSSC performances are investigated intensively. It is found that these special network nanoporous structures between TiO 2 nanoparticle active layer and Ti wire substrate are beneficial to the connection of the nanoparticle layer and fiber-shaped substrate, thus improving the electron transport rate and prolonging electron lifetime . As a result, the power conversion efficiency of this parallel assembled FDSSC increases to 4.64% from 2.56% after this two-step treatment.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Baolin Yan,Lijuan Zhang,Zhiyong Tang,Mohammad Al-Mamun,Huijun Zhao,Xintai Su
Engineering metal-organic frameworks (MOFs) into hierarchical structured materials is crucial for providing a viable platform to construct efficient catalysts and broaden their applications in energy conversion and photocatalysis. Here, a simple and efficient solid-state pyrolysis of Ti-MOFs (NH 2 -MIL-125) sacrificial template combined with a photo-reduction process was developed to construct a series of hierarchical TiO 2 decorated with Pd nanoparticles. The hierarchical TiO 2 inherited the well-defined rounded rectangular submicron-tablet from NH 2 -MIL-125 precursor and was constituted of uniform anatase TiO 2 nanoparticles with an average size of 12 nm. Furthermore, the photocatalytic activity for the hydrogen production from water-methanol solution was improved by the optimization of the content of Pd as a cocatalyst, and the maximum was achieved with a Pd loading of 1.5%. The rate of H 2 evolution of 1.5% Pd decorated hierarchical TiO 2 (1.5% Pd/TiO 2 ) reached to 979.7 μmol h −1 and 112.7 μmol h −1 , under UV–vis light and simulated solar light, respectively. This unusual photocatalytic activity may be resulted from the positive synergetic effect of efficient light absorption, promoted separation and migration of photo-induced electron-hole carriers. The work highlights the potential of the MOFs-based hierarchical TiO 2 in the photocatalytic water splitting under solar light.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Fei Ye,Houfen Li,Hongtao Yu,Shuo Chen,Xie Quan
Protons tend to bond strongly with unsaturated-coordinate S element located at the edge of nano-MoS 2 and are consequently reduced to H 2 . Therefore, increasing the active S atoms quantity will be a feasible approach to enhance hydrogen evolution. Herein we developed a porous TiO 2 derived from metal organic frameworks (MOFs) as scaffold to restrict the growth and inhibit the aggregation of MoS 2 nanosheets. As a result, the thickness of the prepared MoS 2 nanosheets was less than 3 nm (1–4 layers), with more edges and active S atoms being exposed. This few-layer MoS 2 -porous TiO 2 exhibits a H 2 evolution rate of 897.5 μmol h −1 g −1 , which is nearly twice as much as free-stand MoS 2 nanosheets and twenty times more than physical mixture of MoS 2 with porous TiO 2 . The high performance is attributed to that more active edge sites in few-layer MoS 2 -porous TiO 2 are exposed than pure MoS 2. This work provides a new method to construct MOFs derived porous structures for controlling MoS 2 to expose active sites for HER.
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危险品化学品经营许可证（带存储）