Materials Science & Engineering C-Materials for Biological Applications
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2019
·
IF 4.959
Yada Li,Weiqiang Wang,Fengyun Yu,Dongjiao Wang,Shiwei Guan,Yan Li,Min Qi
Calcium (Ca) and strontium (Sr) are beneficial for bone reconstruction. This study incorporated Ca and Sr into the TiO 2 coatings by one-step micro-arc oxidation (MAO) treatment with CaO and SrO added in tetraborate electrolytes. The structure, composition, hydrophilicity, ion release, and cytocompatibility of the coatings were studied. The coatings combine layered micron-scale pores in various sizes and nano-scaled pores, forming a hierarchical structure. This hierarchical structure is highly porous and super-hydrophilic. The coatings are composed of Ti, O, and B, as well as Ca or Sr. Ca and Sr mainly distribute in the outer layer of the coatings and exist in the forms of carbonates and oxides. The formation of the coatings was discussed. Ca and Sr incorporated into the coatings are readily released into aqueous solutions. The homogeneous surface structure of the coatings leads to an excellent and approximating performance in hydrophilicity, as well as the adhesion and spreading of the human bone marrow-derived mesenchymal stem cells (hBMSCs). The simultaneous incorporation of Ca and Sr incorporation exhibits superior facilitation in the proliferation of hBMSCs compared with single Ca or Sr incorporation. This study shows a promising method to incorporate bioactive elements into the MAO coatings on titanium surfaces.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Rudi Ruben Maça,Daniel Cíntora Juárez,Miguel Castillo Rodríguez,Vinodkumar Etacheri
Titanium dioxide recently gained attention as sodium-ion battery anode material. However, its practical application is hindered by low specific capacity (~150 mAh/g), and mediocre cycling stability. Here we report for the first time, nanointerface-driven Na-ion intercalation pseudocapacitance tuning as a strategy to substantially improve the performance of TiO 2 anodes. This is achieved by tuning the crystal mismatch between anatase and bronze crystallites of hierarchical TiO 2 nanosheets. Hybrid TiO 2 nanosheets composed of ~10 nm sized anatase (~85%) and bronze (~15%) crystallites exhibited significantly higher pseudocapacitive Na-ion storage compared to phase-pure bronze and anatase TiO 2 nanosheets. High specific capacity of 290 mAh/g (~0.87 mol Na-ions) at a current density of 25 mA/g is obtained for this composition. Hybrid TiO 2 maintained a specific capacity of 120 mAh/g even at a high current density of 1 A/g. Coulombic efficiency (~100%) and cycling stability are outstanding, retaining 90% of the initial capacity after 2500 galvanostatic cycles. These electrochemical performances are noticeably superior to amorphous and crystalline TiO 2 reported earlier. Mechanistic studies proved Na-ion intercalation pseudocapacitance without considerable structural changes. Excellent electrochemical performance of dual-phase hierarchical TiO 2 nanosheets is credited to the superior Na-ion intercalation pseudocapacitance resulting from anatase-bronze nanointerfaces. The demonstrated strategy of nanointerface-driven pseudocapacitance tuning provides new opportunities for the designing of advanced Na-ion battery anodes.
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Membranes
·
2019
·Vol. 9
·期 1
·16
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IF 0
Tao Wu,Zongman Zhang,Ding Zhai,Yang Liu,Qingguo Liu,Lixin Xue,Congjie Gao
A ternary nanocomposite consisting of N-doped graphene (NGR)/TiO2/activated carbon (NGRT@AC) was prepared, and the components’ synergetic effect on dye degradation was investigated after deposition on the surface of a polysulfone membrane (PSF). As far as we know, this ternary composite catalyst has never previously been used to degrade dyes nor been used as a functional layer for separation membranes. The surface morphology and structure of the as-prepared membranes were analyzed by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The NGRT@AC-modified PSF membrane (NGRT@AC-PSF) presents excellent photodegradation efficiency to methyl orange (MO) under both UV (95.2%) and sunlight (78.1%) irradiation, much higher than those values of PSF, TiO2- modified PSF (TiO2-PSF), and N-doped graphene/TiO2(NGRT)-modified PSF membranes (NGRT-PSF) under the same conditions. The high flux recovery ratio (95.5%) demonstrates that the NGRT@AC-PSF membrane shows improved antifouling performance. The photocatalytic results prove that surface deposition method (95.2%) was better than the blending method (31.1%) for forming high-performance membranes. Therefore, the NGRT@AC-PSF membrane has the potential for broad applications in dye degradation to treat waste water from textile industries.Keywords:N-doped graphene/TiO2/activated carbon nanocomposite;methyl orange;photocatalytic;antifouling performance;membrane
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Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-9
·
IF 3.159
Chen Chunmao,Zhao Danchen,Zhou Qingxiang,Wu Yalin,Zhou Xianqi,Wang Hongyuan
In the present work, polyaniline and CeO 2 co-decorated TiO 2 nanotube arrays (PANI/CeO 2 /TiO 2 NTAs) were facilely prepared by an electrochemical method. The as-prepared materials were characterized by scanning electron microscopy (SEM), an X-ray diffractometer (XRD), and energy-dispersive X-ray spectroscopy (EDS). The photoelectrocatalytic activity of as-prepared materials was investigated with tetrabromobisphenol A (TBBPA) as the target analyte, and the data showed that PANI/CeO 2 /TiO 2 NTAs resulted in much higher photoelectrocatalytic efficiency than that of other materials. Under optimal conditions, the degradation rate of TBBPA reached a maximum value over 96% in 120 min under simulated solar irradiation. The results indicated that CeO 2 and PANI co-modified TiO 2 NTAs could narrow the band gap, expand the response from ultraviolet (UV) to visible region, increase the amount of active free radicals, inhibit the recombination rate of electron-hole pairs, and finally enhance the degradation efficiency towards TBBPA owing to the presence of Ce 3+ /Ce 4+ and PANI. Moreover, the degradation reaction followed the first-order kinetics, and degradation rates of the repeated experiments were all over 92% for ten runs. All these results indicated that this novel catalyst earned great potential as a powerful photoelectrocatalyst for the removal of TBBPA and other pollutants.
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高影响因子
RSC Advances
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2019
·Vol. 9
·期 9
·4682-4692
·
IF 3.049
Yang Yang,Zhun Hu,Rongli Mi,Dan Li,Xiang Yong,Huie Yang,Kunfeng Liu
A series of manganese-based catalysts supported by 5–10 nm, 10–25 nm, 40 nm and 60 nm anatase TiO2 particles was synthesized via an impregnation method to investigate the effect of the initial support particle size on the selective catalytic reduction (SCR) of NO with NH3. All catalysts were characterized by transmission electron microscopy (TEM), N2 physisorption/desorption, X-ray diffraction (XRD), temperature programmed techniques, X-ray photoelectron spectroscopy (XPS) and in situ diffuse reflectance infrared transform spectroscopy (DRIFTS). TEM results indicated that the particle sizes of the MnOx/TiO2 catalysts were similar after the calcination process, although the initial TiO2 support particle sizes were different. However, the initial TiO2 support particle sizes were found to have a significant influence on the SCR catalytic performance. XPS and NH3-TPD results of the MnOx/TiO2 catalysts illustrated that the surface Mn4+/Mn molar ratio and acid amount could be influenced by the initial TiO2 support particle sizes. The order of surface Mn4+/Mn molar ratio and acid amount over the MnOx/TiO2 catalysts was as follows: MnOx/TiO2(10–25) > MnOx/TiO2(40) > MnOx/TiO2(60) > MnOx/TiO2(5–10), which agreed well with the order of SCR performance. In situ DRIFTS results revealed that the NH3-SCR reactions over MnOx/TiO2 at low temperature occurred via a Langmuir–Hinshelwood mechanism. More importantly, it was found that the bridge and bidentate nitrates were the main active substances for the low-temperature SCR reaction, and bridge nitrate adsorbed on Mn4+ showed superior SCR activity among all the adsorbed NOx species. The variation of the initial TiO2 support particle size over MnOx/TiO2 could change the surface Mn4+/Mn molar ratio, which could influence the adsorption of NOx species, thus bringing about the diversity of the SCR catalytic performance.
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Energy Technology
·
2019
·Vol. 7
·期 9
·1900247
·
IF 3.163
Pengyuan Gao,Yun Lu,Shuyi Deng,Xun Cui,Qing Zhang,Yingkui Yang
Homogeneous confinement of metal oxide nanoparticles into the heteroatom-doped carbon matrix is highly desirable but remains challenging to develop high-performance anode materials. Herein, a facile simultaneous polymerization of 2-thiophenemethanol (ThM) and titanium ethoxide (TTEO) is proposed to incorporate ultrafine anatase TiO 2 nanocrystals into the continuous S-doped carbon framework by carbonizing the as-produced TiO 2 /poly(2-thiophenemethanol) composites. This in situ crafting process spatially suppresses the growth of TiO 2 by the polymerization of ThM, thus producing size-adjustable TiO 2 nanocrystals (5–50 nm) by tailoring the ratio of TTEO to ThM. It is found that smaller TiO 2 nanocrystals are generated using the lower TTEO-to-ThM ratio. When used as lithium-ion batteries (LIBs) anode, TiO 2 /S-doped carbon (TSC) shows larger reversible capacity, superior rate capability, and better cycling stability compared to pure TiO 2 . A typical TSC with the smallest TiO 2 nanocrystals (8 nm) shows the reversible capacity as high as 386 mAh g −1 at 50 mA g −1 , and retains 55% of initial capacity at 500 mA g −1 , and 96.8% capacity after 500 cycles at 1000 mA g −1 . The excellent electrochemical performance is attributed to the shortened ion diffusion path of ultrafine TiO 2 and the improved electronic conductivity, structural stability, and surface/interface nature by the S-doped carbon matrix.
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高影响因子
ACS Applied Materials & Interfaces
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2019
·
IF 8.456
Chengzhang Zhu,Yuting Wang,Zhifeng Jiang,Annai Liu,Yu Pu,Qiming Xian,Weixin Zou,Cheng Sun
Bi3TaO7 is a potential photocatalyst because of its high chemical stability, defective fluorite-type structure, and superior mobility of photoinduced holes. However, few studies have focused on the interfacial effects of Bi3TaO7-based photocatalysts. In this work, 0D Bi3TaO7 nanodot-hybridized 3D V and N codoped TiO2 nanoblock (B/VNT) composites were first synthesized for the photocatalytic removal of oxytetracycline hydrochloride, 2,4,6-trichlorophenol, and tetrabromobisphenol A. The fabricated B/VNT had a photocatalytic performance superior to that of pristine components, and probable degradation pathways were proposed according to the primary intermediates identified by a gas chromatography–mass spectrometer. Interestingly, on B/VNT, the transfer of interfacial electrons was observed from V/N–TiO2 to Bi3TaO7, and the formed built-in electronic field led to a direct Z-scheme structure, rather than type II, as confirmed by the generated •OH and •O2– radicals and band structures from the density functional theory calculation. Therefore, the strong interfacial electronic interaction on the B/VNT was significant, which drove faster photogenerated charge transfer, more visible-light adsorption, and active •OH and •O2– generation, thus improving the photocatalytic activity.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
·
IF 3.218
Yanjie Chen,Shupei Zhang,Xiuhua Li,Hong Dai,Yanyu Lin
A versatile TiO 2 mesocrystals trigged signal amplification photoelectrochemical (PEC) sensing platform was designed for sensitive and accurate determination of α-fetoprotein (AFP). To construct such a biosensor, Bi 2 S 3 nanosheets with notable visible light photoactivity and biocompatibilities were employed as electron transfer mediator as well as a substrate for AFP antigen immobilization. Meanwhile, the Polyethylenimine (PEI) functionalized TiO 2 mesocrystals was used to anchor AFP antibody and the resulting composite Ab-TiO 2 -PEI was utilized as trace tag for signal amplification. The trace tag anchored onto the electrode interface via indirect competitive recognition between free target AFP and immobilized AFP to combine Ab-TiO 2 -PEI. As a result, a cascade structure of band-edge levels formed between TiO 2 mesocrystals and Bi 2 S 3 nanosheets, which notably promoted the photo-to-current conversion efficiency and enhance photocurrent response significantly. By merit of these, the concentration of AFP could be accurately determined through an indirect competitive reaction immunoassay . Upon the optimal condition, this PEC biosensor performed favorable sensitivity, selectivity and reproducibility. Hence, the designed indirect competitive PEC immunoassay possesses a potential application for clinical test and will inspire more development of simple and practical PEC sensor toward different biomolecules.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Shasha Xu,Wangyang Lu,Shujun Chen,Zheng Xu,Tiefeng Xu,Virender K. Sharma,Wenxing Chen
This paper presents the fabrication of colored photocatalytic fibers by individually combining white TiO 2 with red α-Fe 2 O 3 , green copper perchlorophthalocyanine (CuPcCl 16 ), and blue copper phthalocyanine (CuPc), followed by immobilization of three as-prepared nanocomposites (i.e., Fe 2 O 3 /TiO 2 , CuPcCl 16 /TiO 2 , and CuPc/TiO 2 ) onto the low melting point sheath-core composite polyester fibers (LMPET). The spectroscopic and surface measurements of colored fabrics show uniform distribution of the composites on LMPET fibers. Compared with TiO 2 -based white fabric, the prepared colored catalytic fabrics have better performance in photocatalytic degradation of formaldehyde (HCHO), a pollutant in water and indoor air. In addition, the prepared fibers could be recycled or reused without any appreciable decrease in their effectiveness. The investigation of antibacterial activity of colored fabrics shows 6-log inactivation of both Escherichia coli and Staphylococcus aureus . The enhancement in the photocatalytic activity of colored fabric is attributed to a broadening photo-absorption region and also a decrease in the recombination of electron-hole pairs. In the photocatalytic process, an increase in photocurrent response suggests the increase in charge separation. Additionally, hydroxyl radicals ( OH) as the major reactive species in photocatalytic activity of colored fabrics are confirmed by the electron paramagnetic resonance technique. This study suggests that the developed colored photocatalysts can be applied in textiles to clean water and air.
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高影响因子
BIOSENSORS & BIOELECTRONICS
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2019
·
IF 9.518
Hui-Fang Cui,Ting-Ting Zhang,Qi-Yan Lv,Xiaojie Song,Xiao-Jing Zhai,Gai-Gai Wang
A stable and sensitive electrochemical acetylcholinesterase (AChE) biosensor for detection of organophosphorus pesticides (OPs) was developed by doping Au nanorods (AuNRs)@mesoporous SiO 2 (MS) core-shell nanoparticles into CS/TiO 2 -CS (CS denotes for chitosan) immobilization matrix. AuNRs@MS core-shell nanoparticles were synthesized and characterized. The doping and the biosensor fabrication process were probed and confirmed by scanning electron microscopy and electrochemistry techniques. The doping conditions were optimized. The matrix both before and after AChE immobilization had a mesoporous nanostructure . The nanoparticles dispersed homogeneously within the matrix. The doping significantly enhanced the electro-conductivity of the TiO 2 -CS hydrogel, and dramatically improved the bioelectrocatalytic activity and OPs detection sensitivity of the AChE immobilized matrix. The detection linear ranges for both dichlovos (DDVP) and fenthion were from 0.018 μM (4.0 ppb) to 13.6 μM, and the limit of detection (LOD) was 5.3 nM (1.2 ppb) and 1.3 nM (0.36 ppb), respectively. The biosensor exhibited high reproducibility and accuracy in detecting OPs spiked vegetable juice samples. In addition, it exhibited very high detection stability and storage stability. The developed AChE biosensor was provided to be a promisingly applicable tool for OPs detection with high reliability, simplicity, and rapidness.
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Peng Lv,Chongyang Zhao,Woo Jae Lee,Siping Huo,Se-Hun Kwon,Jun Fang,Yang Yang
Zero-dimensional/two-dimensional (0D/2D) TiO 2 /g-C 3 N 4 heterostructural photocatalysts were fabricated via ALD technique. TiO 2 nanoparticles were “site-selectively grown” on g-C 3 N 4 nanosheets and the surface modification induced band engineering of the composite photocatalysts. Thus, the redox properties of the photocatalysts were fine tuned. Under visible light , since only g-C 3 N 4 was excited, TiO 2 was acting as the electron transport channel in the optimized interfacial structures . They effectively suppressed the recombination and facilitated the transfer of photogenerated charges, improving the photocatalytic activity. When both the components were excited under UV–vis light, the dynamic equilibrium of the conduction band positions on these n–n type semiconductor heterojunctions led to the increased recombination rate of charges, decreasing the reactivity for H 2 evolution. However, the photocatalytic degradation of organic pollutants by these composite photocatalysts exhibited enhanced activities, resulting from the photogenerated holes on VB of TiO 2 which could promote oxidation of organic pollutants with strong oxidation potentials. Furthermore, TiO 2 /g-C 3 N 4 photocatalysts with limited numbers of deposition cycles exhibited optimal photocatalytic activity under visible light. In contrast, excessive deposition cycles on g-C 3 N 4 for TiO 2 /g-C 3 N 4 led to continuous film and increased thickness of TiO 2 , resulting in the attenuation of the reactivity. We verified this TiO 2 /g-C 3 N 4 photocatalysts with less mass-loading, but more enhanced photocatalytic activity.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Lanjie Li,Xinmin Yu,Lei Xu,Yahui Zhao
Metalloporphyrinic metal-organic framework (PCN-222) is a promising photocatalytic material due to its large surface area and 1D channel, exceptional stability, high visible-light capture capability, and semiconductor properties. Herein, we constructed a highly efficient visible-light-driven type II heterojunction photocatalyst PCN-222-PW 12 /TiO 2 by one step solvothermal method. The 5 wt% PCN-222-PW 12 /TiO 2 showed the superior photocatalytic properties for degrading rhodamine B (RhB) and Ofloxacin, which are 10.69 and 10.48 times higher than pure TiO 2 under same conditions. The excellent photocatalytic performance of PCN-222-PW 12 /TiO 2 ternary composite material was attributed to the improved adsorption capacity of organic pollutants, optical absorption in the entire visible light region, and highly-efficient separation of photoinduced carriers. Besides, we found that h + , O 2 − , and OH are the main active elements in the photocatalytic degradation process. This will back up the higher photocatalytic activity of PCN-222-PW 12 /TiO 2 compared with pure TiO 2 . The photocatalytic efficiency of composite maintained a similar level of photoactivity after four times recovery, which showed excellent stability and recyclability of PCN-222-PW 12 /TiO 2 . This work provides new insights into the fabrication porphyrin-MOF composite materials with high photocatalytic efficiency for environmental remediation.
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危险品化学品经营许可证（带存储）