APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Zhenyu Zhu,Feng Zhou,Su Zhan,Yu Tian,Qiuchen He
Marine fouling organisms attachment can bring serious damage to ships and marine facilities. Thus, we modified the hydrophobic fluorocarbon resin coating (PEVE) which was widely used in marine hulls. In this study, graphene/TiO 2 nanocomposite photocatalysts have been taken as the raw material of the modification to prepare the composite coatings with anti-fouling performance through a sample method. The results of our experiment demonstrate that when the mass ratio of rGO to TiO 2 is 1:100, the composite coating exhibits the best antibacterial property. This coating could kill the vast majority of the bacteria which attached to its surface after one hour of exposure to ultraviolet light, and this sterilization performance is much higher than pure PEVE and TiO 2 /PEVE coatings. In this composite system, graphene plays an important role in enhancing the coatings performance. For one thing, the heterojunction formed by graphene and TiO 2 can effectively increase the hydroxyl radical yields of TiO 2 . For another, the conjugated structure of graphene can effectively reduce the phenomenon of hydrophobicity reduction which is caused by the addition of TiO 2 and then decrease the risk of hull corrosion availably.
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高影响因子
APPLIED SURFACE SCIENCE
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2015
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IF 2.711
Yinyan Gong,Chengxin Fu,Lv Ting,Jingru Chenu,Qinger Zhao,Can Li
Aiming to improve the photocatalytic activity, boron and tantalum co-doped TiO 2 nanocrystals were prepared by a sol–gel method. Pure and doped titania samples were characterized by X-ray diffraction (XRD) measurements, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and UV–vis diffuse reflectance spectroscopy. The results revealed that all the samples have highly crystalline anatase structure, and no any other second phase was observed. It is found that the incorporation of dopants inhibits the growth of TiO 2 nanocrystal. Moreover, XPS observations showed that Ta are in the form of Ta 5+ while the majority of B species are present at interstitial sites. Finally, photocatalytic activities of all the samples were evaluated by degradation of methylene blue (MB) solutions under simulated solar light irradiation. Ta-doped and (B, Ta)-codoped catalysts exhibit enhanced photocatalytic activities in comparison with pure TiO 2 , with the codoped sample exhibiting the best photodegradation performance. This indicates that B and Ta co-doping is an effective way to improve photocatalytic performance of TiO 2 . The catalytic activity of B-doped TiO 2 becomes slightly worse than pure TiO 2 nanocrystals, which is plausible due to increased charge carrier recombination centers induced by incorporation of boron species.
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高影响因子
CERAMICS INTERNATIONAL
·
2019
·Vol. 45
·期 8
·10845-10851
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IF 3.45
Yuhan Yao,Ju Rong,Jing Feng,Yannan Zhang,Xiao Wang,Xiaohua Yu,Zhaolin Zhan
The modification of TiO 2 is a vigorous and challenging research field. In the present study, TiO 2 /CuO composite nanofibers , designed by considering the thermodynamics of nanocrystals , have been synthesized by an electrospinning and hydrothermal method . The results showed that the grain growth of uniform and highly active CuO was driven by the surface drag force of TiO 2 nanofibers. TiO 2 /CuO showed an alternating current impedance as low as 2.874 Ω, and the Li + diffusion rate was increased tenfold compared to that of bare TiO 2 nanofibers. Equally importantly, the electron diffusion kinetics was also explored, which revealed that the band gap was reduced by 1.14 eV compared to that for bare TiO 2 nanofibers. In addition, TiO 2 /CuO exhibited satisfactory stability and electrochemical performance. Its initial discharge capacity was 540 mAh·g −1 , and that after discharge over 400 cycles at 0.1 C was 174 mAh·g −1 . The design method may be more broadly applied to various nanostructured TiO 2 materials.
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高影响因子
Materials
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2019
·Vol. 12
·期 6
·896
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IF 2.972
Zhu Zhu,Ye Zhang,Yibo Zhang,Yanli Shang,Xueji Zhang,Yongqiang Wen
Ethylene causes faster deterioration of perishable crops during postharvest transportation and storage. The present study aimed to develop TiO2-coated nanofibers with efficient photocatalytic activities to enhance the degradation of fruit-emitted ethylene. The consecutive electrospinning of polyacrylonitrile (PAN) and TiO2deposition was successfully performed to produce PAN@TiO2nanofibers. The scanning electron microscopy results indicate the uniform distribution of TiO2nanoparticles on the surface of the PAN nanofiber. The PAN@TiO2composite nanofibers exhibited enhanced photocatalytic activity for ethylene degradation under low-intensity UV light irradiation. Furthermore, a tomato fruit-ripening test confirmed the effectiveness of the PAN@TiO2nanofibers. The PAN@TiO2nanofibers exhibited effective ethylene degradation and slowed the color shift and softening of the tomatoes during storage. The results suggest great potential for use of the PAN@TiO2composite nanofibers as ethylene scavenging packaging material for fresh fruits and vegetables.
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高影响因子
Metals
·
2019
·Vol. 9
·期 2
·171
·
IF 2.259
Zhengyu Cai,Hui Kong
TiO2nanoparticles and Mg alloy were added to molten steel in sequence to investigate the inclusion and microstructure characteristics. Compared with a non-treated sample, these additives resulted in the formation of Ti–Mg-bearing inclusions, which proves that the additives were valid. The size evolution from nanometer-scale TiO2to micrometer-scale oxides hints at the agglomeration and growth of the TiO2nanoparticles, which is due to the possible formation of a liquid-capillary force, the decomposition reaction of TiO2, and the higher Gibbs free energy of the nanoparticle. Furthermore, the statistical analysis of the oxides indicated that with the addition of the TiO2nanoparticles and Mg alloy, the oxides were refined and their density was higher. Few pure MnS were observed in the treated sample. This is due to the fact that most oxides separated out in the liquid region at 1873 K based on the oxide composition and the calculated Al2O3–Ti3O5–MgO phase diagram. Thus, MnS preferred to segregate on them during solidification. After etching, it was found that the Ti–Mg-bearing oxide can induce the nucleation of intragranular acicular ferrites. The appearance of these acicular ferrites was not observed in the non-treated sample. This comparison indicates the effectiveness of the external adding method in oxide metallurgy.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2012
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IF 3.461
Weishuang Ni,Songping Wu,Qun Ren
Surface modification of TiO 2 nanoparticles with 3-methacrylic acyloxy propyl trimethoxysilane (KH570) was carried out in the liquid phase. As additives, the modified TiO 2 nanoparticles were employed as charge control agents (CCAs) in the toner. The hydroxyl groups on the surface of TiO 2 nanoparticles can interact with methoxy groups of KH570 and an organic coating layer formed. The Ti O Si bond was testified by Fourier transform infrared spectra (FTIR). Through transmission electron micrograph (TEM) observation, it was found that the organic coating layer was about ∼3.1 nm and the dispersibility of the modified TiO 2 nanoparticles were obviously improved. Static water contact angle was used to investigate the wettability of the modified TiO 2 surfaces. The results indicated that the hydrophobicity of the modified TiO 2 nanoparticle surfaces could be effectively improved as the amount of the coated KH570 increased. The specific surface area (SSA) of the modified TiO 2 was determined by Brunauer–Emmet–Teller (BET) method. Surface morphology of the modified toner and the toner charge were investigated by scanning electron microscopy (SEM) and electrometer, respectively. The modified toner showed smoother surface and the toner charge was adjusted by the modified TiO 2 nanoparticles. The charge-to-mass ratio (Q/M) values shifted to the negative direction, for example −13.25 μC/g, with an increasing coated KH570, probably due to the OH groups existing on the surface of TiO 2 .
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高影响因子
ANALYTICAL CHEMISTRY
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2009
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IF 5.712
Qingqing Guo,Shujun Ji,Qiaoli Yue,Lei Wang,Jifeng Liu,Jianbo Jia
Antioxidant amperometric sensors based on iron-containing complexes and protein modified electrodes were developed. Indium tin oxide glass was printed with TiO2 nanoparticles, onto which iron-containing compounds and protein were adsorbed. When applied with negative potentials, the dissolved oxygen is reduced to H2O2 at the electrode surface, and the H2O2 generated in situ oxidizes FeII to FeIII, and then electrochemical reduction of FeIII therefore gives rise to a catalytic current. In the presence of antioxidants, H2O2 was scavenged, the catalytic current was reduced, and the decreased current signal was proportional to the quantity of existing antioxidants. A kinetic model was proposed to quantify the H2O2 scavenging capacities of the antioxidants. With the use of the sensor developed here, antioxidant measurements can be done quite simply: put the sensor into the sample solutions (in aerobic atmosphere), perform a cathodic polarization scan, and then read the antioxidant activity values. The present work can be complementary to the previous studies of antioxidant sensor techniques based on OH radicals and superoxide ions scavenging methods, but the sensor developed here is much easier to fabricate and use.
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高影响因子
LANGMUIR
·
2018
·
IF 3.789
Junxian Gao,Jinze Lyu,Ji Li,Junwei Shao,Yanhong Wang,Weiqi Ding,Rui Cheng,Siyu Wang,Zebin He
Understanding the mechanism by which oxygen adsorption influences the separation behavior of charge carriers is important in photocatalytic removal of air pollutants. In this study, we performed steady-state surface photovoltage and surface photocurrent spectroscopy combined with an atmosphere control system to determine the effect of oxygen on the charge separation behavior at the surface of anatase TiO2 nanoparticles at ambient temperature. Results showed that photogenerated electrons were movable in N2 atmosphere but were localized in O2 atmosphere. O2 obviously enhanced the stabilization of the localized photogenerated electrons when the surface defects of TiO2 were fully occupied by adsorbed O2. Moreover, O2 adsorption increased the energy demand for exciting electrons from the valence band to localized surface defect states and reduced the density of band tail states. These findings suggest us that the effect of gaseous species on the mobility and stability of charge carriers should be considered to understand the photocatalytic degradation of air pollutants.
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高影响因子
Journal of Environmental Chemical Engineering
·
2024
·Vol. 12
·期 2
·112109
·
IF 7.4
Nguyen Tien Hoang
In this study, a novel Ti/TiO 2 Blue/SnO 2 -Sb@Ni-La (denoted as SnO 2 -Sb@Ni-La(H)) was successfully prepared by hydrothermal method . The fabricated SnO 2 -Sb@Ni-La(H) electrode exhibited the superior electrocatalytic properties: high oxygen evolution potential (2.34 V vs. SCE), low charge transfer resistance (73.4 Ω cm −2 ), and highest degradation efficiency of benzoic acid (BA) ( k BA = 0.112 min −1 ), compared with other electrodes. The degradation rate of BA on the SnO 2 -Sb@Ni-La(H) was 3.6-fold, 4.7-fold, and 7-fold higher than that of SnO 2 -Sb@Ni-La(T), Ti/TiO 2 Blue, and Ti/SnO 2 -Sb, respectively. The study showed that •OH was the main radical contributing to pollutants degradation and the first-order degradation rate of organic pollutants in electrochemical oxidation (EO) process depends on their reactivity towards •OH ( k •OH,OP ), except for the case of methyl orange (MeO). Among the proposed combination methods, the combination of adsorption and electrochemical oxidation (rGO + EO process) exhibited excellent performance: the first-order degradation rate of P-nitrosodimethylaniline ( k RNO ) in (rGO + EO) process increased by 1.42-fold, compared with the EO process alone. This can be explained by the synergy effect from adsorption of RNO on rGO and the degradation of RNO during the EO process. The hydrothermal deposition combined with thermal decomposition can significantly improve the physical and electrochemical oxidation properties of the Ti/TiO 2 Blue/SnO 2 -Sb@Ni-La electrode: k RNO increased by 3.5-fold, compared with that of 1-time deposition by hydrothermal deposition. In addition, the effect of some operating parameters was investigated, including pH, current density, cathode size and distance of electrodes. This study provided a new method to prepare high-performance Ti/TiO 2 Blue/SnO 2 -Sb@Ni-La electrode and proposed some methods to improve the removal efficiency of the pollutants.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yifang Sun,Xiongwei Yang,Hao Zhou,Xinxin Zhao,Yao Shen,Jingkai Zhao,Jiexu Ye,Chenghang Zheng,Shihan Zhang,Xiang Gao
CO 2 emissions from industrial processes are becoming a growing global concern due to their impact on climate change. Catalyst-aided amine solvent regeneration is an effective approach for achieving low-energy carbon capture. Existing desorption catalysts regenerate amine solutions by accelerating proton transfer during CO 2 desorption, but limited proton transfer efficiency under alkaline conditions leads to inevitable deactivation of active sites. Herein, we developed TiO 2 /Ti 3 C 2 , a TiO 2 nano-islands structured catalyst via in situ oxidation of Ti 3 C 2 T x MXene nanosheets. The remaining MXene enhances electron transfer between TiO 2 nano-islands, promoting CO 2 desorption-induced solvent regeneration through proton-coupled electron transfer effect via Raman spectroscopy and low-temperature electron paramagnetic resonance experiments. Theoretical calculation demonstrates that TiO 2 /Ti 3 C 2 reduce the energy barrier of solvent regeneration by 44.9 % compared to the non-catalytic scenario. The CO 2 desorption rate increased by 150 %, while the relative energy penalty of the solvent regeneration decreased by 75 %. The regeneration temperature was reduced from 120 °C to 98 °C with an amine-based biphasic solvent, effectively preventing ~28 % of amine degradation. Additionally, TiO 2 /Ti 3 C 2 demonstrates exceptional stability, showing negligible performance degradation and structural changes after 10 cycles. This work offers valuable insights for designing catalysts to achieve efficient and robust CO 2 capture.
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Jingjing Ren,Taolin Zhang,Shouzheng Jiao,Fanghua Pan,Jingru Sun,Ran Mo,Yuwei Hao,Zhengyu Chen,Siqiao Zhang,Zhicheng Sun,Zhongjun Cheng
This study reports a novel core-shell structured microcapsule system, in which 2-hydroxyethyl methacrylate is used as the core material and Ethyl cellulose (EC) as the shell. Titanium dioxide (TiO 2 ) nanoparticles were electrostatically assembled onto the microcapsule surface and subsequently grafted with polydimethylsiloxane (PDMS) under UV irradiation, forming PDMS-functionalized TiO 2 -ethyl cellulose microcapsules (PDMS-TECM). These microcapsules were uniformly embedded within an epoxy matrix to construct a robust and intelligent coating. The incorporation of TiO 2 significantly enhanced the thermal stability, mechanical strength, and UV-induced thermal effects of the coating, enabling rapid crack closure under UV exposure. Simultaneously, the photocatalytic activity of TiO 2 enabled the degradation of organic pollutants, while the grafted PDMS chains imparted surface hydrophobicity and antifouling properties. The synergistic integration of UV-induced thermal self-healing, photocatalytic cleaning, and hydrophobic surface functionality provides a multifunctional strategy for the development of next-generation self-sustaining coatings suitable for harsh environments.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Minghui Sun,Xiangqian Quan,Xi Ma,Hetuo Chen,Xianpeng Qin,Guohong Zhou
The effects of TiO 2 content and sintering temperature on the electrical and mechanical properties of the alumina ceramics prepared via vacuum sintering were investigated. The sample comprises the phases of Al 2 O 3 , MgAl 2 O 4 , and Al 2 TiO 5 . Under vacuum sintering conditions, oxygen atoms in TiO 2 detach from the crystal lattice, forming quasi-free electrons, oxygen vacancies and Ti 3+ , thereby reducing the volume resistivity of alumina ceramics. XPS (X-ray photoelectron spectroscopy) analysis revealed that the increasing TiO 2 content facilitates the transformation of Ti 4+ to Ti 3+ , while elevated sintering temperatures further enhance Ti 3+ concentration, attributed to the enhanced lattice activity of TiO 2 . The increasing TiO 2 generated more Al 2 TiO 5 with Al 2 O 3 , which accumulated at grain boundaries, inhibiting grain growth through a pinning effect and forming more uniform and smaller grains, thereby enhancing mechanical property. Optimal comprehensive properties were achieved at a sintering temperature of 1500°C with 6 % TiO 2 content, demonstrating a density of 3.88 g/cm 3 , volume resistivity of 1.2×10 11 Ω·cm, dielectric strength of 3.6×10 6 V/m, hardness of 14.4 GPa, and thermal conductivity of 17 W/(m·K). The series of outstanding performances confirm that Al 2 O 3 ceramic with TiO 2 doping is an excellent candidate material in advanced semiconductor processing.
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高影响因子
危险品化学品经营许可证（带存储）