CHEMICAL PHYSICS
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2018
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IF 1.707
Hang Zhang,Yan Zhang,Junwei Yin,Zhenzi Li,Qi Zhu,Zipeng Xing
In-situ N-doped mesoporous black TiO 2 photocatalyst is fabricated by a facile sol-gel method combined with an in-situ solid-state chemical reduction technique, using urea as nitrogen resource. The N-doped mesoporous black TiO 2 possesses high surface area of 96 m 2 g −1 , large pore size of 5.4 nm and narrow band gap of 2.05 eV. Meanwhile, the optical absorption extends to visible light region because of Ti 3+ and N co-doping. The N-doped mesoporous black TiO 2 exhibits higher photocatalytic activity than that of others under visible light irradiation for photocatalytic degradation of methyl orange (MO) and rhodamine B (RhB), which is up to 93.27% and 93.64%, respectively. The enhancement is ascribed to the synergistic effect of the N and Ti 3+ co-doping extending the visible light absorption, the separation efficiency of photogenerated charge carriers, and the mesoporous structure with large surface area offering more surface active sites, which is beneficial for improving the photocatalytic activity.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 17
·15241-15248
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IF 2.324
Ma Xiaochun,Liu Yanjun,Liu Han,Xu Bin,Zhou Jing,Xiao Fan
In this study, the microencapsulated phase change material with paraffin as core and inorganic TiO 2 shell was successfully synthesized by in situ hydrolysis and polycondensation of tetrabutyl titanate in a nonaqueous oil-in-water emulsion using formamide as aqueous phase. The chemical compositions, crystalline structure, morphology and microstructure of paraffin@TiO 2 microcapsules were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffractometer (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The thermal properties and thermal stability of the microcapsules were measured by differential scanning calorimeter (DSC) and thermo-gravimetric analyzer (TGA). FT-IR and XRD results proved that there was no chemical reaction between paraffin core and TiO 2 shell material. SEM images indicated that the paraffin@TiO 2 microcapsules showed a regular spherical shape with the average diameters of 2–5 µm with a smooth shell. SEM and TEM studies also confirmed the paraffin was fully encapsulated with TiO 2 . DSC analysis indicated that the microcapsules had similar phase change behaviors as those of pure paraffin. Typical sample froze at 52.24 °C with a latent heat of 110.42 J g −1 and melt at 60.41 °C with a latent heat of 107.54 J g −1 , of which the encapsulation ratio achieved to 54.58%. TGA results indicated the thermal stability of paraffin was improved by the protection of TiO 2 shell through the encapsulation.
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SUPERLATTICES AND MICROSTRUCTURES
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2018
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IF 2.099
Ni Sun,Jing Ma,Chao Wang,Juanqin Xue,Liangsheng Qiang,Jieli Tang
A facile and efficient one-step hydrothermal method was performed to prepare the TiO 2 /reduced graphene oxide (TiO 2 /rGO). The obtained materials were characterized by X-ray diffraction (XRD), Raman spectra , transmission electron microscopy (TEM), X-ray photoelectron spectra (XPS) and UV–vis diffuse reflectance spectra. The results showed that the well dispersed TiO 2 nanoparticles with anatase were found uniformly distributed throughout the surface of rGO sheets. The as-prepared composite was used to photocatalytic degradation of Methylene blue (MB), and the experiment results show that TiO 2 /rGO exhibited an enhanced photocatalytic activity for MB degradation under visible-light irradiation compared to Degussa P25, which was attributed to extended light absorption and increased charge separation efficiency due to excellent electrical properties of GO and the chemical bond between rGO and TiO 2 nanoparticles. The composite maintained a higher level of activity after five recycles without any significant loss of photo-catalytic activity. The results manifested that the facile synthesis via a one-pot hydrothermal treatment can provide an effective approach to enhance the performance of TiO 2 /rGO, which is a promising candidate in wastewater treatment application.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2018
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IF 2.207
Xiong-Fei Zhang,Zhongguo Wang,Yuxia Zhong,Jianhao Qiu,Xingguang Zhang,Yuan Gao,Xiaoli Gu,Jianfeng Yao
In this study, homogeneous alloy Au Pt nanoparticles were successfully immobilized on ultrathin TiO 2 nanorods via a facile photodeposition technique. The Au Pt/TiO 2 hybrid exhibited high photocatalytic activity and stability during the selective photosynthesis of benzaldehyde from benzyl alcohol under visible light . The optimal performance was obtained with the Au 1 Pt 1 /TiO 2 sample, which had a benzyl alcohol conversion rate of 65.3%. The engineered TiO 2 nanorods (304 m 2 /g) can be employed as a stabilizing matrix and an excellent dispersant for noble metal particles. Moreover, the formation of the alloy structure substantially enhances the photoinduced carrier separation efficiency compared with loading Au or Pt alone on TiO 2 . The bimetallic nanoparticles exhibited the properties related to the individual metals, as well as new properties due to synergistic effects of the electron-accumulating function of Pt and the surface plasmon resonance of Au.
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APPLIED SURFACE SCIENCE
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2018
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IF 4.439
Di Wang,Yun Tan,Huaxiu Xu,Xionglei Wang,Lina Yu,Zhixin Xiao,Jide Wang,Shimei Xu
A tough and fluorescent NC hydrogel was fabricated by introduction of SiO 2 @TiO 2 core-shell structure nanoparticles (NPs) into polyacrylamide (PAAm)/Laponite nanocomposite (NC) hydrogel. The photoluminescent and mechanical properties of the resultant PAAm/Laponite/SiO 2 @TiO 2 dual NC hydrogel were explored with respect to the shell thickness of SiO 2 @TiO 2 . The dual NC hydrogel emitted stable and bright blue photoluminescence (PL), when radiated at 350 nm. The emission wavelength was slightly shifted from 423 to 428 nm with the increasing of the shell thickness due to the surface interaction of SiO 2 @TiO 2 NPs and polymers. Besides, the compressive strength and compressive fracture energy of the PAAm/Laponite/SiO 2 @TiO 2 dual NC hydrogels were 7535.8 kPa and 5740.3 J/m 2 which increased by 19 and 21%, respectively, relative to the MLS@T 0 dual NC hydrogel. The tensile strength was 207.2 kPa at a strain of 730%. The dual crosslinking of SiO 2 @TiO 2 NPs and Laponite, as well as the dual nanocomposite structure were responsible for the enhanced mechanical properties.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2018
·
IF 3.997
Maohua Chen,Yan Hu,Menghuan Li,Maowen Chen,Xinkun Shen,Zhong Luo,Caiyun Mu,Weihu Yang,Peng Liu,Kaiyong Cai
Sclerostin is a negative regulator of the Wnt signaling pathway for osteoblast differentiation. In this study, osteoblasts were co-cultured with osteocytes (MLO-Y 4 cells) on the surface of sclerostin antibody-conjugated TiO 2 nanotube arrays (TNTs-scl). Field emission scanning electron microscopy (SEM), contact angle measurement and confocal laser scanning microscope (CLSM) were employed to characterize the conjugation of sclerostin antibody onto the surface of TiO 2 nanotube arrays. The cellular viability and morphology results displayed TNTs-scl (TNT30-scl and TNT70-scl) were beneficial to the growth of MLO-Y4 cells. There was no apparent change in sclerostin gene expression between MLO-Y4 cells grown on TNTs and TNTs-scl. However, TNTs-scl significantly reduced the amount of sclerostin in the medium. In comparison with the control groups, osteoblasts displayed higher differentiation capability when co-cultured with MLO-Y4 cells on the surface TNTs-scl, which was indicated by the ALP activity, mineralization capability as well as expression levels of key proteins in Wnt signaling. This study provides a simple strategy to engineer titanium surface for bone fracture recovery, especially in osteoporotic conditions.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
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2018
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IF 3.057
Li Fu,Yong Huang,Wen Cai,Huaiwei Zhang,Jiehui Yang,Dihua Wu,Weitao Su
Improving the hydrophilicity of titania nanotubular arrays (TNAs) could promote their interfacial reaction rate when they interact under aqueous conditions. In this work, we proposed a simple hydrothermal method for Si and Sr doping. A significant hydrophilicity improvement could be observed in TNAs after the doping process. Therefore, Si@Sr/TNAs exhibited a superior urease loading and showed excellent chronocoulometric performance towards urea interaction.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
N’dri Dieudonné Diby,Yueqin Duan,Patrick Atheba Grah,Fengshi Cai,Zhihao Yuan
In the photoelectrochemical (PEC) water splitting for the hydrogen production, the fabrication of a stable and efficient photocatalyst semiconductor remains a challenge. CdS, which is one of most used chalcogenide materials, coupled with metal oxide semiconductor exhibit a generally low durability. TiO 2 nanorods arrays (TNR) sensitized with CdS were synthesized via hydrothermal method and denoted as TNR-CdS. CdS deposition on TNR surface was controlled by regulating the hydrothermal reaction time. The samples were characterized by X-ray diffraction, Raman spectroscopy , scanning electronmicroscopy, X-ray photoelectron spectroscopy, and UV-visible absorption. A high PEC performance as well as a great CdS sensitized TNR photoanodes stability were exhibited. These results could be due to the intimate contact between CdS and TNR, favoring a fast separation of photogenerated charge carriers. The optimal PEC performance was achieved when CdS was deposited on TNR for 10 h. Under AM 1.5G illumination at applied potential of 0 V vs Ag/AgCl, TNR-CdS (10 h) is found to have a photocurrent density of 6.5 mA/cm 2 against 2.25 mA/cm 2 for TNR. Additionally, TNR-CdS (10 h) presented a photoconversion efficiency of 2.5% at −0.4 V vs Ag/AgCl, while that of TNR was 0.9% at-0.35 V vs Ag/AgCl. TNR-CdS showed great stability with and without sacrificial reagent. These results were confirmed by electrochemical impedance spectroscopy measurements, where the rapid transfer/transport and separation of photogenerated charge carriers were highlighted.
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ACS Nano
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2019
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IF 13.903
Huihui Liu,Yue Li,Miaomiao Xiang,Hualing Zeng,Xiang Shao
Interfacial charge transfer is critical for the photocatalytic activities of compositional photocatalysts. In this work, we have developed a strategy of growing single-layer MoS2 sheets on the rutile TiO2(110) single-crystal surface using a chemical vapor deposition method. Both on-site and off-site characterizations confirmed the monolayer thickness and single crystallinity of the MoS2 adlayer as well as the atomic flatness of the composite surface. Without the presence of contamination, the charge flow across the interface of MoS2 and TiO2 is greatly enhanced, which hence favors the charge separation under excitations and boots up the catalytic activity of the composite system. Moreover, we found the luminescing property of MoS2 is significantly tailored upon coupling with the TiO2 surface. Our work has established a method for revealing the interface properties of the transition-metal dichalcogenides and oxide semiconductors at the atomic level.
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PubMed
高影响因子
Progress in Natural Science-Materials International
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2018
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IF 2.572
Xuejuan Wan,Haoqi Ke,Guanghui Yang,Jiaoning Tang
Titanium dioxide (TiO 2 ) is a common photocatalyst for organic pollutants degradation . However, in practical application, the poor adsorption capacity of pure TiO 2 seriously impeded its efficiency in the degradation of organic molecules. In this work, a series of hierarchical wrinkle mesoporous silica supported TiO 2 nano-composite particles (TiO 2 @WMS-COOH) were successfully prepared. Thanks to their high surface areas, large pore volumes and mesoporous structures, these materials showed high adsorption capacity and excellent photocatalytic performance towards dye molecules, which is comparable to or even better than commercial catalyst P25. Moreover, their photocatalytic efficiency can be further enhanced by increasing the calcination temperature during preparation process. Therefore it can be concluded that the TiO 2 @WMS-COOH particles may find promising applications in the photodegradation of organic pollutants.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Peng Wang,Changchao Jia,Jia Li,Ping Yang
A high efficiency photocatalyst , TiO 2 (B)/anatase spheres consisted of nanosheets were prepared. Thioglycolic acid (TGA) was added into the precursor to control the hydrolysis process of titanium source (TiCl 3 ), which is a key to adjust the microstructure of products. The results indicated that TGA-modified samples revealed enhanced photocatalysis performance compared with the one without TGA. The photocatalysis performance of TGA-modified sample is about 15 times high compared with commercial P25. This is ascribed to mixed crystal phase and lattice distortion which resulted in more activity sites (e.g. Ti 3+ and oxygen defects). The loading of Au nanoparticles in different ways confirms that rich Ti 3+ -oxygen vacancies on the surface of samples caused super photocatalytic performance.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2018
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IF 5.667
Lijia Wang,Wenhong Gu,Pengtao Sheng,Zhiwei Zhang,Bing Zhang,Qingyun Cai
CdS/CuInS 2 /Au/TiO 2 nanotube arrays (NTAs) were fabricated by deposition and dipping technique as well as successive ionic layer adsorption and reaction method, where Au nanoparticles were used to improve the interfacial electron transfer and quantum dots (QDs) of CdS and CuInS 2 (4.1 nm) to stimulate the formation of an ideal stepwise band edge structure with TiO 2 . High and stable photocurrent responses were observed on the NTA electrode. A photoelectrochemical aptasensor toward cytochrome c (cyt c) was then fabricated by immobilization of HS-aptamer on the NTAs via Cd-S bond and Cu-S bond. Sensitive and selective detection of cyt c was achieved with a detection range of 5 pM to 100 nM.
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