APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Xin Chen,Rui-fu Zhu,Zhao-fu Yuan,Han Gao,Wei-li Xu,Gui-yong Xiao,Wen-hua Xu,Yu-peng Lu
To meet the requirements for good mechanical properties, corrosion resistance, and osseointegration of human hard tissue substitutes and prostheses, a bioactive and stable surface is essential. In this work, in-situ construction of a TiO 2 /TiN composite film on titanium is achieved by induction heating at a high temperature under the O 2 + N 2 atmosphere. Furthermore, the surface of the composite film contains abundant oxygen vacancies, which is demonstrated by X-ray photoelectron spectroscopy (XPS) analysis. Transmission electron microscopy (TEM) and focus ion beam (FIB) milling technology are used to further study the cross-sectional microstructure and composition, revealing the formation mechanism of the composite film. The results of the nanoindentation and electrochemical test show that the hardness and corrosion rate of the composite film are 3.45 and 0.2 times that of titanium respectively. Moreover, the composite film is favorable for the deposition of hydroxyapatite in simulated body fluid (SBF). The results of the in vitro cellular experiments demonstrate that the composite film significantly promotes the adhesion, proliferation, and differentiation of BMSCs. Overall, the composite film is desirable for its improved biocompatibility, corrosion resistance, and mechanical properties, enabling it to have potential applications in the biomedical field.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2020
·
IF 4.872
Yu Zhao,Yizhou Tang,Ling Chen,Sidi Lv,Shanji Liu,Penghui Nie,Zoraida P. Aguilar,Hengyi Xu
Human were given a lot of opportunities to ingest TiO 2 NPs in the environment. Children have low, sensitive intestinal tolerance, and they could be exposed to higher levels of TiO 2 NPs than adults. Few studies have been conducted on the interaction between TiO 2 NPs and juvenile intestine phase models. Thus, in this work, weaning rats were orally exposed to TiO 2 NPs for 7 and 14 days. Results indicate that Ti accumulated in the intestine, liver, and feces. Inflammatory infiltration damage was observed in the colonic epithelial tissue, and gut microbiota fluctuated with a decreased abundance of Lactobacilli in feces. Oral supplementation with Lactobacillus rhamnosus GG (LGG) lessened TiO 2 NPs-induced colonic inflammatory injury, which might due to downregulation of nuclear factor kappa-B (NF-κB). Meanwhile, LGG maintained normal intestinal microbiome homeostasis, thereby improving TiO 2 NPs-induced colon injury in juvenile rats. Moreover, fecal microbiota transplant (FMT) experiment indicated possible TiO 2 NPs-induced intestinal microbiota disorder led to colonic inflammation. Our works suggested the urgent need for additional studies on the risk safety assessment, mechanism, and prevention of juvenile health damage from exposure to TiO 2 NPs.
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高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Liying Jiang,Pengju Wang,Yufen Zhang,Zhiwei Yao
Plasma-assisted catalytic oxidation of chlorinated volatile organic compounds (CVOCs) over Co-Mn/TiO 2 catalyst was performed in a dielectric barrier discharge (DBD) reactor having two segmented electrodes. The combination of DBD reactor with segmented electrodes and Co-Mn/TiO 2 catalyst remarkably enhanced the removal efficiency of chlorobenzene (CB) and selectivity of CO 2 . The segmented discharge reactor with Co-Mn/TiO 2 catalyst presented the best performance with 96.3 % of removal efficiency and 69.0 % of CO 2 selectivity at discharge voltage of 17 kV compared with the traditional plasma-only and other plasma-catalytic reactors. Results from discharge characteristics analysis showed that the addition of segmented electrodes and the catalysts could improve the plasma characteristics and greatly boost the specific energy density (SED) at the same voltage, resulting in the generation of more high-energy electrons and chemical active species which favor the oxidation of CB. Although the segmented electrodes facilitated the generation of O 3 , the Co-Mn/TiO 2 catalyst boosted the decomposition of O 3 to generate active oxygen species (O* and O 2 ). The synergistic effect of introducing segmented electrodes and the Co-Mn/TiO 2 catalyst into the DBD reactor at alternate voltages of 13 and 15 kV could promote the deep oxidation of intermediate products thereby bringing less effects on the catalyst surface, leading to a stable and high performance in CB removal. Furthermore, a plausible decomposition mechanism of CB destruction in the DBD reactor having segmented electrode over Co-Mn/TiO 2 catalyst was proposed according to the identification of gaseous intermediates based on GC-MS analysis.
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JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Yuan Deng,Wenjun Yan,Yujing Guo,Qiang Wang,Yingpu Bi,Chuan Dong,Lifang Fan
A photoelectrochemical (PEC) sensing platform for di-2-ethylhexyl phthalate (DEHP) was constructed using graphene quantum dots decorated TiO 2 nanotube arrays (GQDs-decorated TiO 2 NTs) as the transducer species and the anti-DEHP aptamer as the biological recognition element. GQDs were synthesized using the alkali-mediated hydrothermal method, and then anchored onto the TiO 2 NTs uniformly and intimately via pronounced electrostatic interaction. Coupling GQDs with TiO 2 NTs not only enhanced visible-light absorption, but promoted charge separation and transportation, exhibiting excellent photocurrent response, and PEC activity. Various means were conducted to explore morphologies, optical, structural and PEC properties of the materials. As an identification unit, the anti-DEHP aptamer molecules were immobilized on GQDs-decorated TiO 2 NTs using a cross-linking coupling method. The developed PEC sensing platform exhibits excellent sensing behavior for DEHP, and provides a low detection limit of 0.1 ng/L, high selectivity and stability. Meanwhile, its application in real environmental samples was evaluated and satisfying results were achieved. Thus, the established sensing platform provides a promising tool to detect DEHP in the environment.
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高影响因子
Advanced Healthcare Materials
·
2019
·Vol. 8
·期 9
·1801254
·
IF 6.27
Yue He,Jingyuan Wan,Yang Yang,Pei Yuan,Cheng Yang,Zhigang Wang,Liangke Zhang
TiO 2 nanoparticles have emerged as satisfactory sonosensitizers in sonodynamic therapy over the years, but shortcomings such as poor drug loading capability and inadequate techniques to construct suitable TiO 2 nanoparticles, limit their broader applications. Hence, in this paper, versatile nanocomposites that combine mesoporous TiO 2 nanoparticles (mTiO 2 s) with the promising photothermal material, polypyrrole (PPY) to exert synergistic therapeutic effects on tumors are fabricated. The PPY-coated mesoporous TiO 2 nanocomposites (mTiO 2 @PPYs) act as drug delivery vehicles and ultrasonically activated sonosensitizers as well as photothermal agents. Besides, mTiO 2 @PPY may have potential as an ultrasound/photoacoustic (US/PA) imaging contrast agent. The mTiO 2 @PPY shows a favorable drug loading and good photothermal conversion ability. Moreover, intracellular reactive oxygen species generation is verified. The in vitro cell experiments on HepG2 and 4T1 cells demonstrate that honokiol (HNK)-loaded mTiO 2 @PPY has satisfactory cytotoxicity under laser and US irradiation, and the results are further validated by animal experiments. The ability of mTiO 2 @PPY as a contrast agent for US and PA imaging is investigated both in vitro and in vivo. The results indicate that mTiO 2 @PPY-HNK has multitherapeutic effects and bimodal imaging property, which shows great prospect as a novel nanosystem in antitumor applications.
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APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Fuying Li,Quan Gu,Yu Niu,Renzhang Wang,Yuecong Tong,Shuying Zhu,Hualei Zhang,Zizhong Zhang,Xuxu Wang
Pt nanoparticles were loaded on anatase TiO 2 by the photodeposition method to investigate their photocatalytic activity for H 2 evolution in an aqueous solution containing a certain amount of ethylene glycol (EG) as the sacrificial agent. The surface properties and chemical states of the Pt/TiO 2 sample were characterized by X-ray powder diffraction analysis, Brunauer–Emmett–Teller surface area analysis, transmission electron microscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance, and electrochemical resistance. The aqueous-phase photocatalytic EG reforming using Pt/TiO 2 and anatase TiO 2 generated not only H 2 and CO 2 , but also CO, CH 4 , C 2 H 6 , and C 2 H 4 . Moreover, the amount of formate and acetate complexes in the solution increased gradually. The EG adsorption and gas-phase intermediates during photocatalytic reaction processes were investigated by the in situ FTIR spectrum. Finally, the photocatalytic EG reforming reaction mechanism was elucidated. This helped to better understand the role of a sacrificial agent in a photocatalytic hydrogen production.
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高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Hualin Jiang,Menglin Li,Jun Liu,Xueqin Li,Lei Tian,Pinghua Chen
In this study, a novel CeO 2 -TiO 2 nanocomposite denoted as CeO 2 -3TiO 2 was successfully synthesized via a facile one pot hydro-thermal method without alkali. It exhibits high photocatalytic reduction reactivity toward Cr(VI) under visible light. The photocatalytic reactivity of CeO 2 -3TiO 2 is 18 times higher than that of pure CeO 2 , 28 times higher than pure TiO 2 , 15 times higher than the sample of simply mixed CeO 2 and TiO 2 . The solution with Cr(VI) initial concentration of 2780 ppb can be fast photoreduced by CeO 2 -3TiO 2 in 60 min under visible light to meet the criterion of U.S. Environmental protection Agency. Characterization results indicate CeO 2 -3TiO 2 has the good crystal form of heterojunction structure, narrow pore size distribution , narrow energy gap and high photogenerated electron-hole separation efficiency. Based on the experimental results, a speculated photocatalytic mechanism was proposed.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Taiguang Li,Mingyong Wang,Qingzheng Hou,Yaqi Hou,Kai Xuan,Yongmei Hao
One kind of novel magnetically separable graphene-based titanium dioxide photocatalytic nano-adsorbents (GO-FSNTs) were prepared for the adsorption-photodegradation of phenanthrene under visible light. The GO-FSNTs displayed the high adsorption-photodegradation efficiency and 10 mg of 0.6% GO-FSNT (wt%) can remove 94.9% of phenanthrene within 4 h. The introduction of a small amount of GO enables 0.6% GO-FSNT to selectively adsorb phenanthrene through the π-π interaction, reduce the light-shielding effect and improve separation of photogenerated carriers effectively. Meanwhile, the N-TiO 2 shell is occupied by adsorbed water molecules which can spontaneously repair lattice oxygen. Furthermore, the more hydrophilic surface of 0.6% GO-FSNT is formed by increased photoinduced hydroxyl groups under visible light during photodegradation. The photoinduced hydroxyl groups can further generate OH and improve photocatalytic activity. The degradation pathway of phenanthrene was proposed based on intermediates analysis and density functional theory calculations. This work helps to reveal the relationship between the adsorption-photodegradation and the photoinduced hydrophilicity.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Nan Wang,Xing Li,Yanling Yang,Tingting Guo,Xiaoxuan Zhuang,Siyang Ji,Tingting Zhang,Yi Shang,Zhiwei Zhou
The antibiotic sulfamethazine (SMT) has emerged as a water pollutant that is recalcitrant to conventional water treatment process. A number of technologies based on hydroxyl radical or sulfate radical induced SMT degradation have been described, but photo-induced degradation is not widely examined. Herein, photocatalysts of Bi-doped TiO 2 nano-composites supported by powdered activated carbon (PAC) were prepared, with variable molar ratios of Bi/Ti (0.06:1(6%), 0.08:1(8%), 0.1:1(10%) and 0.12:1(12%)) by a sol-hydrothermal method. The ratio of 10% (Bi-Ti/PAC (10%)) was most efficient to degrade SMT. Experimental variables during photocatalytic degradation were optimized for solution pH, catalyst dosage, initial SMT concentration, and coexisted anions. Under optimal conditions of 1.0 g/L catalyst, 20 mg/L initial SMT concentration, pH 6.0 and visible light irradiation at 400–780 nm, the degradation rate reached 81.18% in 300 min. Compared to Bi-Ti(10%) nano-composite without PAC, pure TiO 2 or commercially available P 25 , Bi-Ti/PAC(10%) was superior for SMT degradation with a degradation kinetic rate of 0.00531 min −1 . The properties of the prepared photocatalysts were characterized by X-ray powder diffraction, scanning electron microscope, X-ray photo-electron spectroscopy, Brunauer-Emmett-Teller and ultraviolet-visible diffuse reflection spectroscopy. This revealed that Bi-Ti/PAC (10%) had a smaller crystal size, larger specific surface area, larger pore size, stronger visible light absorption ability and lower band gap energy than pure TiO 2 . Ten intermediates of SMT were identified and a possible degradation pathway was proposed.
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ENERGY & FUELS
·
2019
·
IF 3.021
Jialin Meng,Yufeng Duan,Peng Hu,Yifan Xu,Xinze Geng,Ting Yao,Shaojun Ren,Hongqi Wei
A series of Mn–V–W/TiO2 (Mn–VWT) catalysts were synthesized by the impregnation method and calcinated at different temperatures (300–600 °C). To explore the effects of the reaction temperature, SO2, and H2O on the simultaneous removal performance of elemental mercury (Hg0) and NO, Mn–VWT were investigated by a fixed-bed reaction system. Various techniques (scanning electron microscopy, Brunauer–Emmett–Teller, X-ray diffraction, H2-temperature-programmed reduction, NH3-temperature-programmed desorption, and X-ray photoelectron spectroscopy) were utilized to characterize the samples. The results showed that the catalytic activity of Mn–VWT first increased and then decreased with the increasing calcination temperature. The removal efficiency of Hg0 and NO still had good performance even in low reaction temperature (200 °C), achieving 100 and 82%, respectively. Mn–VWT-400 had the best simultaneous removal performance because of the highest content of the Mn4+, V4+, and chemisorbed oxygen Oα and the best reductive activity at low temperature. Furthermore, SO2 irreversibly inhibited Hg0 and NO removal ability due to the sulfate and sulfite generation on the surface of Mn–VWT-400. Especially, the inhibition effect was more serious if SO2 and H2O coexisted because the rate of sulfate/sulfite was higher than that of the former. In addition, with the increase in reaction temperature, the effect of SO2 and H2O on the removal of Hg0 and NO over Mn–VWT was gradually reduced.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Junyan Liu,Liting Xu,Xingwei Li
Supports play a key role in the performance of platinum-based catalysts. In this work, using NH 2 -MIL-125 as the precursor, mixed-phase TiO 2 coated by nitrogen-doped carbon (TiO 2 @NC) is successfully prepared, and used to support platinum (Pt/TiO 2 @NC) for methanol oxidation reaction. In 0.5 M H 2 SO 4 solution containing 0.5 M CH 3 OH, the area specific activity of Pt/TiO 2 @NC catalyst (1.186 mA cm -2 Pt) is 4.4 times that of commercial Pt/C (0.272 mA cm -2 Pt). At a fixed potential of 0.15 V (vs. Hg/Hg 2 SO 4 ), the current density of Pt/TiO 2 @NC is still 3.6 times that of Pt/C after 3600 s of polarization. Meanwhile, Pt/TiO 2 @NC has also a low tafel slope, a large exchange current density and a high charge transfer coefficient. A large number of Ti-OH groups can alleviate poisoning effect caused by the produced "CO ads " intermediate during methanol oxidation reaction. Nitrogen-doped carbon not only improves the conductivity of TiO 2 support, but provides strong anchor sites for the nucleation of Pt nanoparticles , resulting in an enhanced catalytic activity of Pt/TiO 2 @NC.
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ENVIRONMENTAL TECHNOLOGY
·
2022
·
IF 3.475
Fulong Chen,Lijiang Tian,Bingkun Liu,Yue Sun,Sijie Ge,Jing Hou
A new type of photocatalysts, nanocrystalline titanium dioxide (TiO2) doped with Co and I, were synthesized and modified via the sol-gel method to enhance the utilization of visible light. Herein, mono- and co-doped TiO2 (i.e. Co-TiO2, I-TiO2, Co-I-TiO2) were employed as the photocatalysts to investigate the photocatalytic performance on gaseous benzene removal. The prepared photocatalysts were characterized by X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET)-specific surface areas, Raman spectroscopy, UV-visible diffuse reflectance spectroscopy (UV-vis-DRS), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL), and electrochemical impedance spectroscopy (EIS). Results indicated that both particle sizes and band gaps of TiO2 were significantly reduced by doping with Co/I. Also, the lattice defects and the specific surface areas of TiO2 were substantially augmented by adding Co/I because of the increase of oxygen vacancies, especially for Co-I-TiO2. Meanwhile, Co and I were distributed on the titanium base with the existence of multivalent states. The benzene treatment capacity of Co-I-TiO2, Co-TiO2, I-TiO2 and Pure TiO2 is 441.46, 424.36, 388.06, and 51.25 μgC6H6/(g·h), respectively. To sum up, photocatalytic degradation of gaseous benzene could be improved by doping with Co/I because of the extension of catalyst lifetime and light response range covering visible light.
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