RSC Advances
·
2018
·Vol. 8
·期 24
·13625-13634
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IF 2.936
Huijun Liang,Shengnan Liu,Hucheng Zhang,Xiaobing Wang,Jianji Wang
Rhodamine B (RhB) has often been used as a model pollutant, but its photocatalytic mechanism is still controversial. Herein, Ag NPs were sandwiched between CdS QDs and amorphous-TiO2 (a-TiO2) with the intent to build a CdS/Ag/a-TiO2 catalyst with highly selective oxidation activity. When rhodamine B (RhB) was used as the model organic compound, the CdS/Ag/a-TiO2 composite can not only modulate radical generation but also improve the conversion ratio of RhB to rhodamine 110 (Rh-110) to as high as 82% at 80 min during the visible-light irradiation. A series of the radical scavenging experiments revealed that CdS/Ag/a-TiO2 composites could modulate the effects of hydroxyl radicals (·OH) and superoxide anion radicals (·O2−) at different reaction stages so that the overoxidation of RhB and Rh-110 were repressed. Therefore, the transient state protection mechanism of selective oxidation of RhB was proposed to explain the reaction selectivity for Rh-110. Although the effects of both ·O2− and ·OH are important during the photocatalytic selective oxidation of RhB, it is shown that the selective oxidation of RhB would be performed when the effect of ·O2− is bigger than the ·OH, if not, RhB would be oxidized unselectively. Meanwhile, this may provide a new strategy for modulating radical generation in the photocatalysis of water phases.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
Polymers
·
2021
·Vol. 13
·期 22
·3977
·
IF 4.329
Chenglong Wang,Luyang Qiao,Qiang Zhai,Kai Yan,Lili Wang,Jinhuan Zheng
Herein, a polyurethane acrylate-based TiO2(PU-TiO2) was fabricated using a two-step method. First, a polyurethane prepolymer was prepared. Second, PU-TiO2was prepared using amino-modified TiO2(A-TiO2). The best synthesis process of the polyurethane prepolymer was when the reaction temperature was 80 °C, the reaction time was 3 h and theR-value of the polyurethane acrylate was 2. Next, the influence of the A-TiO2content on the structure and performance of PU-TiO2was examined. The analysis of the rheological properties of the PU-TiO2ink indicated that its viscosity gradually increased as the A-TiO2content increased. The tensile performance of film improved because of the presence of A-TiO2. The photo-polymerisation and photo-rheological performance indicated that the PU-TiO2structure changed from a hyperbranched structure with TiO2as the core to a segmented structure, as the A-TiO2content was 3%.Keywords:polyurethane acrylate-based TiO2;polyurethane prepolymer;A-TiO2;hyperbranched structures;blue light-curable ink
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 102
·83795-83800
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IF 3.84
Dezhong Zhang,Fuyi Jing,Fengli Gao,Liang Shen,Dongming Sun,Jingran Zhou,Yu Chen,Shengping Ruan
The performance of a Schottky metal–semiconductor–metal (MSM) ultraviolet (UV) photodetector is limited by the insufficient gain and the uncontrollable noise current. A remarkable detectivity UV detector is demonstrated based on graphene oxide (GO) modified TiO2 with high gain and low noise. The GO layer completely prevents the flow of electrons forming a hole-only device thus decreasing the dark current and noise current. Furthermore, gain of the holes is promoted under UV illumination. Moreover, the GO layer efficiently extracts the holes therefore reducing the fall time. Under a bias of 6 V, the responsivity value reaches 826.8 A W−1 and the noise current is only 1.8 pA, thereby, our device provides a detectivity of 2.82 × 1013 cm Hz1/2 W−1 at 280 nm. The results offer an effective approach to enhance the performance of a UV detector.
研究领域:
材料科学
·
光电探测
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DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 14
·期 8
·8206-8215
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IF 1.5
Jing Luo,Xiaohua Yu,Shiyou Li,Ruijia Diao
The thermodynamic functions of A-TiO2 nano-materials with different shapes (nanowires, nanotubes, nanoflakes and nanoparticles) were investigated by Faraday's law and open-circuit potentiometry. The results showed that the A-TiO2 nanoparticles have the highest chemical activity (nanoparticles > nanoflakes > nanotubes > nanowires) at the same size, and the corresponding free energies and enthalpy are AG=-895.59kJ • mol -1 , A S=76.09J • K -1 mol -1 , ΔH=847.21kJ • mol -1 ; However, the stability of A-TiO2 nanowires is the best (nanowires > nanotubes > nanoflakes > nanoparticles), and the ionic diffusion coefficient is lower than other structures (nanowires < nanotubes < nanoflakes < nanoparticles). There are more surface-active spots in nanometer-sized A-TiO2, which makes it more likely to lose electrons in the equilibrium state. This work intends to provide a reference for the design and analysis of various nanostructured materials.
研究领域:
材料科学
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纳米技术
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热力学
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电化学
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DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2018
·
IF 4.732
Chengwei Xu,Wenxia Xie,Xiaodong Si,Jun Zhang,Jiangang Yang
A TiO 2 /MWCNTs/Al 2 O 3 /NF (TiO 2 nanoparticles/multi-walled carbon nanotubes /Al 2 O 3 -modified nickel foams) composite filter was prepared through grown of MWCNTs upon Al 2 O 3 -modified nickel foams using chemical vapor deposition (CVD) method and then coated TiO 2 nanoparticles onto MWCNTs using dip-coating method. The MWCNTs forms a network-like structure on the surface layer of composite filter. The BET surface area of TiO 2 /MWCNTs/Al 2 O 3 /NF composite filter is more than 375 times higher than that of the pristine nickel foam. The degradation performance of oil particles was evaluated. Under optimized reaction conditions, 90% of the oleic acid on the filter was decomposed after 25 h. In addition, the effect of reaction temperature and light intensity were studied. Increased reaction temperature and light intensity were found to significantly improve the degradation rate and restrain the formation of refractory product. Furthermore, a parallel reaction kinetic model was adopted for degradation of oleic acid on the composite filter. The composite filter can reduces the accumulation of oil particles on the filter and the energy consumption of the filter. This approach proposes a new way to treat the cooking fume emission at residential building roofs.
研究领域:
环境科学
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材料科学
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化学工程
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大气污染控制
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纳米技术
✓ 已验证
DOI
高影响因子
CATALYSIS TODAY
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2017
·
IF 4.636
Yanping Fan,Zhenluo Yuan,Guodong Zou,Qingrui Zhang,Baozhong Liu,Qiuming Peng
Differing from graphene with a carbon element component, analogous metallic-graphene two-dimensional layered titanium carbide (2D MXene) provides more opportunities to achieve better surface functionalization. Herein, a thin layered 2D MXene/A-TiO 2 composite was prepared by chemical exfoliation and hydrothermal decomposition. The 2D MXene/A-TiO 2 composite exhibits high catalytic activity in the adsorption and desorption of hydrogen kinetics for NaAlH 4 . The critical dehydrogenation temperature of NaAlH 4 is ∼90 °C. The first-stage dehydrogenation (∼3.0 wt.%) is accomplished in 50 min at 110 °C. After the first activated cycle, a constant cycling capacity of 4.7 wt.% is remained for a minimum of five cycles tests. It is found that the excellent catalytic activation should be ascribed to the synergistic effect between homogenous distributed Ti-H and TiC, which are originated from MXene/A-TiO 2 . The results represent a new step forward in the applications of MXene catalytic dehydrogenation and provide new strategies in the quest for new functional MXene derivatives by in-situ modification.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 48
·12848-12856
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IF 5.256
Tao Ji,Qian Liu,Rujia Zou,Yongfang Zhang,Lili Wang,Liwen Sang,Meiyong Liao,Junqing Hu
A simple hydrothermal process involving thermal diffusion has been developed to synthesize almost vertical doped titanium dioxide (TiO2) nanorod arrays on a silicon (Si) surface. The enhanced ultraviolet-visible (UV-vis) light photodetectors with a TiO2/Si heterojunction were fabricated using band engineering, by doping indium (In) or nitrogen (N) in TiO2 nanorod arrays. The photodiodes showed high quantum efficiencies of 200–400% under visible light illumination (e.g., 565 nm), and ∼16% with UV light (365 nm). Additionally, the N-doped TiO2/Si devices, with a unilateral linearly graded junction, had greater rectification characteristics, lower dark current, better quantum efficiency and response to UV detection, and the In-doped TiO2/Si heterojunction had a better multiplication factor for weak visible light detection, with a decreased electronic barrier and increased carrier concentration. These excellent results mean that doped TiO2/Si heterojunctions will be useful for new UV-vis light detection enhanced photodiodes which do not require expensive auxiliary equipment, thus making them easy to use in applications involving portable and wearable equipment.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xiaoyan Yu,Hua Lai,Hongjun Kang,Yuyan Liu,Youshan Wang,Zhongjun Cheng
Directional self-transportation of tiny droplets is significant in many fields. However, almost all existing studies focus on the phenomenon in air, and to realize similar performance in complex environments, such as oil, is still extremely rare. Here, we report a TiO2-coated conical spine (TCS) and demonstrate underoil directional self-transportation of water droplets on its surface. It is found that high surface hydrophilicity resulting from UV irradiation is necessary to achieve the self-transportation of water in oil. The critical water contact angle in oil is about 57°, and the maximal transport velocity can reach 1.4 mm/s. Mechanism analysis reveals that the excellent self-transportation property is ascribed to the combined effect between the Laplace force (FL) caused by the conical gradient structure and the hysteresis reduction resulting from the high hydrophilicity. Moreover, based on the special underoil self-transportation performance, a droplet-based microreaction and demulsification of water-in-oil emulsions were demonstrated using the TCS. This work reports the self-transportation of water in oil, which could provide some fresh ideas for designing new superwetting self-transportation materials.
研究领域:
材料科学
·
界面化学
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Xiaoyan Yu,Siyu Chen,Xulai Wen,Ximing Cui,Zhongjun Cheng
In recent years, Janus membranes with asymmetric wettability have shown broad prospects in fields such as directional liquid transport and oil/water separation. However, current Janus membranes generally exhibit efficacy solely in a single medium (air or oil), a factor that substantially restricts their practical utility across multiple media. Herein, we report a stearic acid modified TiO 2 (TiO 2 -SAD) Janus membrane with unidirectional permeation capability in both air and oil. By controlling the UV irradiation time (60 min in air, 120 min in oil), the asymmetric wettability of the membrane is regulated, thereby achieving such dual-medium unidirectional permeation. The membrane exhibits excellent cyclic reusability, maintaining favorable unidirectional permeation performance after 20 cycles. Furthermore, it possesses broad adaptability, showing unidirectional permeability toward aqueous solutions with different pH values in both air and oil, while enabling underoil unidirectional permeation for oils with varying viscosities, tensions, and both light and heavy oils. It facilitates versatile utilization in both air and oil, capable of separating immiscible oil/water mixtures (separation efficiency >99 %) and achieving in-situ demulsification of water-in-oil emulsions, as well as multifunctional applications including fog collection in air and underoil water harvesting. This novel TiO 2 -SAD Janus membrane demonstrates versatility in both air and oil, offering new perspectives for Janus membrane development.
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Ying Zhang,Jie Zhong,Sihan Chen,Hongwei Zhang,Mingdeng Wei
Interfacial water plays a crucial role in charge transfer and energy conversion at the semiconductor–liquid junction. Here, we firstly demonstrate that TiO 2 with varied crystal phases generates a region of particle-free and negatively charged water at the TiO 2 –water interface without light. Upon irradiation, a mixed-phase TiO 2 electrode (anatase: rutile ≈ 7:3) paired with FTO generated a stable photovoltage of 0.32 V in deionized water without any added redox couples. This photovoltage correlates with surface hydrophilicity as well as crystal-phase composition, revealing a previously overlooked interplay between TiO 2 and interfacial water. These experimental findings not only provide new insights into photoinduced charge dynamics and self-cleaning mechanism at the TiO 2 –water interface, but also suggest an alternative pathway for light-to-electrochemical energy conversion directly from water.
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Xuefeng Zhang,Yong Liu,Shangli Dong,Zhuyu Ye,Yu Guo
A TiO 2 -Ti 3 C 2 T x nanocomposite was prepared using a simple and facile one-step hydrothermal method . The small sized TiO 2 nanoparticles were synthesized and assembled on the surface of Ti 3 C 2 T x nanosheets using Ti 3 C 2 T x itself as titanium source by in-situ technique. The microstructure of TiO 2 -Ti 3 C 2 T x nanocomposite was characterized by means of XRD、FESEM、TEM、XPS and Raman, respectively. The effects of ethanol and hydrothermal holding time on the size of TiO 2 nanoparticles were investigated. The results show that adding proper amount of ethanol into pure water results in decrease of the size of TiO 2 nanoparticles. Under ethanol-water mixed solution, increasing the time of hydrothermal treatment results in growth and even aggregation of TiO 2 nanoparticles. The TiO 2 nanoparticles with average particle size of 30 nm were obtained when the hydrothermal treatment was conducted in ethanol-water mixed solution at 200 ℃ for 12 h.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Jinshan Chen,Qiao Zeng,Shuangyou Bao,Fei Wang,Chi Wang,Kai Li,Yi Mei
Designing efficient and selective photocatalysts for CO 2 conversion under mild and practical conditions remains a significant challenge. This study aims to establish a sustainable strategy for constructing MOF-derived TiO 2 @TPA hybrids that enable efficient charge separation and selective CO 2 -to-CO conversion under low CO 2 concentrations without sacrificial agents. To achieve this, a TiO 2 @TPA hybrid material was synthesized via in-situ hydrothermal transformation of MIL-125(Ti) in water at 100 °C, without the use of organic solvents or high-temperature calcination. The resulting composite integrates TiO 2 nanocrystals with polymeric terephthalic acid (TPA) through Ti–O–C bonds, forming a stable interface that promotes ligand-to-metal charge transfer (LMCT). This interfacial structure enhances visible-light absorption and facilitates efficient charge separation. When applied to photocatalytic CO 2 reduction under low CO 2 concentrations (∼10 %), the TiO 2 @TPA hybrid achieved highly selective CO generation without the need for sacrificial agents or photosensitizers. In situ infrared spectroscopy and surface photovoltage analysis revealed the formation and stabilization of *COOH intermediates, elucidating the enhanced reaction pathway. This study demonstrates a scalable strategy for constructing MOF-derived hybrid photocatalysts and provides insights into interfacial design for selective CO 2 separation and conversion.
研究领域:
光催化材料
·
环境化学
·
材料科学
·
可持续化学
·
二氧化碳转化
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）