CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Wanli Zhang,Meigui Ou,Chunlin Yang
In this paper, erbium-doped gadolinium oxide rare earth oxide nanoparticles (Gd 2 O 3 :Er 3+ ) with good light absorption capacity from the visible to the infrared region were prepared by polyol method, and then compounded with TiO 2 by hydrothermal method. SEM, TEM, XPS, UV–vis and electrochemical workstation were used to study the morphology, structure, UV–vis light absorption and photoelectrochemical (PEC) properties of Gd 2 O 3 :Er 3+ /TiO 2 . The results showed that the Gd 2 O 3 :Er 3+ spherical nanoparticles with a particle size of about 15 nm were uniformly distributed on the surface of the TiO 2 nanorod array, and the Gd 2 O 3 :Er 3+ /TiO 2 nanocomposites had good light absorption capacity in the infrared region. Furthermore, the photocurrent densities of Gd 2 O 3 /TiO 2 and Gd 2 O 3 :Er 3+ /TiO 2 were 2.08 and 2.75 times higher than those of TiO 2 , respectively, manifesting that the broadening of infrared light absorption can improve the PEC property of TiO 2 . Meanwhile, the DFT calculation results showed that the energy band of Gd 2 O 3 :Er 3+ /TiO 2 was significantly narrower than that of TiO 2 , indicating that Gd 2 O 3 :Er 3+ /TiO 2 had a redshift phenomenon of UV–vis absorption. The calculation results of state density showed that the f orbital of Gd 2 O 3 :Er 3+ intersected with the d orbital of TiO 2 , indicating that there is an electron transfer between Gd 2 O 3 :Er 3+ and TiO 2 .
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RARE METALS
·
2025
·
IF 11
Yang Hui-Ying,Zhao Yu,Huang Ke-Lei,Meng Xiang-Chao
Combining interfacial solar evaporation with a three-phase photocatalytic system can theoretically improve the production efficiency of ammonia. Herein, we designed a simple solar evaporator via in situ growth of TiO 2 onto hydrophilic carbon paper using a fast Joule heating method. This system had porous channels for high water evaporation rates, wide light-responsive wavelength range, effective light absorption, and potentially high catalytic activity. The lattice disorder and oxygen vacancies created by the rapid heating and cooling process could be reaction sites for nitrogen adsorption and activation. The ammonia yield in the three-phase system was up to 360.37 mol·g −1 ·h −1 , which was higher than the two-phase system (17.14 μmol·g −1 ·h −1 ). Additionally, the ammonia yield rate was 73.65 μmol·g −1 ·h −1 in an outdoor test, demonstrating the potential for large-scale solar nitrogen reduction reaction (NRR). As detected, the activation energy for N 2 reduction to NH 3 was reduced to 26.3 kJ·mol −1 , indicating that this process was facilitated by the design of the photothermal–photocatalytic system. Furthermore, density functional theory (DFT) calculations confirmed the roles of oxygen vacancies as active sites in promoting the NRR. This work provided a new approach to applying solar evaporators for the highly efficient ammonia production by the synergistic effects of photothermal and photocatalytic processes. Graphical abstract
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Yaoyao Wu,Xiaotao Chen,Jiachun Cao,Yuqing Zhu,Wenjing Yuan,Zhuofeng Hu,Zhimin Ao,Gary W. Brudvig,Fenghui Tian,Jimmy C. Yu,Chuanhao Li
Photocatalysis is a promising technology for energy and environment applications. Herein, a dual-defect heterojunction system of TiO 2 hierarchical microspheres with oxygen vacancies modified with ultrathin MoS 2−x nanosheets (MoS 2−x @TiO 2 -OV) is designed for simultaneously degrading pollutants and evolving hydrogen. MoS 2−x @TiO 2 -OV exhibits a dramatically enhanced photocatalytic activity with a H 2 evolution rate of 2985.16 μmol g −1 h −1 . In treating the simulated pharmaceutical wastewater, MoS 2−x @TiO 2 -OV is capable of purifying various refractory contaminants, with the highest H 2 evolution rate of 41.59 μmol g −1 h −1 during enrofloxacin degradation. While treating the simulated coking wastewater, the catalyst achieves a H 2 evolution rate of 102.72 μmol g −1 h −1 and a mineralization rate of 50%. Computational studies suggest that the dual-defect is superior for the adsorption of H* and producing·OH (‘dual-defect boosted dual-function’). Also, the dual-defect sites significantly boosted the charge-carrier separation and transfer efficiencies. This work highlights the crucial role of defect engineering to develop the energy-recovering wastewater treatment approaches.
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Advanced Energy Materials
·
2019
·Vol. 9
·期 31
·1901634
·
IF 24.884
Hailong Xiong,Lanlan Wu,Yu Liu,Tunan Gao,Kaiqian Li,Yan Long,Rui Zhang,Ling Zhang,Zhen-An Qiao,Qisheng Huo,Xin Ge,Shuyan Song,Hongjie Zhang
Multiphasic titanium dioxide (TiO 2 ) possessing abundant heterophase junctions have been widely used for various photocatalytic applications. Current synthesis of multiphasic TiO 2 mainly involves the process of thermal treatment and multiple steps of rigorous reactions, which is adverse to controlling the crystal phases and phase ratios of multiphasic TiO 2 . Meanwhile, the resulting products have relatively low surface area and nonporous structure. Here, a facile polymer-assisted coordination-mediated self-assembly method to synthesize mesoporous TiO 2 polymorphs with controllable heterophase junctions and large surface area by using polyethylenimine as the porogen in an acidic aqueous synthesis system is reported. Using this approach, the crystal phases (triphase, biphase, and monophase) and phase compositions (0–100%) are easily tailored by selecting the suitable acidic media. Furthermore, the specific surface areas (77–228 m 2 g −1 ) and pore sizes (2.9–10.1 nm) are readily tailored by changing the reaction temperature. The photocatalytic activity of mesoporous TiO 2 polymorphs is evaluated by photocatalytic hydrogen evolution. The triphasic TiO 2 exhibits an excellent photocatalytic H 2 generation rate of 3.57 mmol h −1 g −1 as compared to other polymorphs, which is attributed to the synergistic effects of heterophase junctions and mesostructure. The band diagram of possible electron transfer pathway for triphasic TiO 2 is also elucidated.
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Materials
·
2025
·Vol. 18
·期 18
·4252
·
IF 3.2
Shouzhen Duan,Wanjun Zhang,Xiaoyan Wang,Youqing Zhao,Hui Nan,Guijun Yang
This research was designed to improve the separation efficiency of photogenerated carriers in TiO2through the construction of a PN heterojunction. The motivation behind this was to tackle the problems of the narrow light response range and the high electron-hole recombination rate of TiO2. By simple one-step implementing electrospinning and calcination procedures, CuO/TiO2PN heterojunction nanofibers were successfully synthesized. XRD and SEM analyses confirm that the heterojunction is a nanofiber structure composed of TiO2and CuO, with the TiO2containing anatase and rutile phases. The PL reveals that the fluorescence intensity of the heterojunction is lower compared to that of pure TiO2, and this implies a remarkable enhancement in the carrier separation efficiency. Under xenon light irradiation, for the optimized sample, the degradation rate of RhB exceeds 80%. This degradation rate is 68% higher than that of pure TiO2. The improvement in photocatalytic performance can be ascribed to the efficient charge separation driven by the built-in electric field within the PN junction and the extended light absorption range. The photoelectrochemical test further verified that the photocurrent density of the heterojunction system was 52.42% higher than that of the single TiO2, providing a new strategy for designing efficient photocatalytic systems.
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Materials Today Communications
·
2025
·
IF 4.5
Thi-Ngat Tran,Van Huan Bui,Thanh Thao Phan,Duy-Nam Phan
The development of multifunctional membranes with self-cleaning and antibacterial properties is a significant pursuit in advanced materials science for the application of water and air filtration. Novel nanocomposite membranes composed of electrospun cellulose nanofibers (CL nanofibers) modified with silver-doped titanium dioxide (Ag-TiO 2 ) nanoparticles were successfully prepared with average fiber diameters to be in the range of 316 nm to 348 nm and doped and undoped TiO 2 nanoparticle sizes from 9.74 nm to 14.17 nm. The self-cleaning performance, derived from photochemical activity, was systematically evaluated against common organic stains, including green tea, red wine, and coffee, under simulated solar irradiation (Xenon lamp), demonstrating up to 55.27 %, 81.38 %, and 77.83 % stain degradation, respectively. The composite membranes containing 2 % Ag doped TiO 2 exhibited potent antibacterial activity, effectively inhibiting both representative Gram-positive ( Staphylococcus aureus ) and Gram-negative ( Escherichia coli ) bacteria with bacterial reduction of 99,98 % and 99,99 %, respectively. These results highlight that strategic combination of electrospinning and nanoparticle immobilization provides a powerful route to designing multifunctional hybrid materials, demonstrating significant potential for diverse real-world applications such as smart textiles, self-cleaning filtration membranes, and antimicrobial surfaces.
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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.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Rongjian Xue
To further enhance the comprehensive performance of polymer electrolytes, this study prepares a ternary composite gel polymer electrolyte (CGPE) based on TiO 2 /thermoplastic polyurethane (TPU)/polydimethylsiloxane (PDMS) via a solution casting method, systematically investigating the influence of TiO 2 content on the properties of CGPE. Structural characterization reveals that TiO 2 nanoparticles achieve a “dual crystalline phase regulation” mechanism by inhibiting polymer crystallization and introducing anatase crystal phase. When the TiO 2 content is 9 wt%, the CGPE exhibits optimal performance: ionic conductivity reaches 4.59 × 10 −3 S/cm, an 81.5% increase compared to the pure polymer matrix; tensile strength is 9.61 MPa, elongation at break is 449%; lithium ion transference number is 0.78; and the electrochemical stability window is 0–5.0 V versus Li/Li + . The assembled LiFePO 4 /Li half-cell demonstrates a rate capability of 87.4% when the current density increases from 0.1 to 1 C, with 99.2% retention after 100 cycles. The results confirm the application potential of TiO 2 -reinforced CGPE in high-safety lithium-ion batteries.
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Analytical Methods
·
2025
·
IF 2.6
Changqiu Ma,Daheng Jiang,Linghui Zeng,Lixin Zhu,Xiaoliang Xu
Conventional photoelectrochemical (PEC) biosensors based on ZnO and TiO2 face challenges in applications in vivo due to the poor penetration of excitation light through the skin. To address this limitation, we designed a novel near-infrared (NIR)-driven FTO@UC@Cu2O@TiO2 heterojunction biosensor for subcutaneous L-cysteine detection. NIR light penetrates the skin and excites the upconversion material (called UC for short, NaYF4:Er, Yb), which emits visible light at 540 nm. This emission activates the Cu2O semiconductor to generate photocurrent. The Cu2O@TiO2 heterojunction facilitates charge carrier separation and suppresses electron-hole recombination. The biosensor demonstrates stable, sensitive, and reproducible detection of L-cysteine over a range of 10 μM to 10 pM, with a detection limit of 5.2 pM. Notably, it also enables subcutaneous detection covering a range from 10 μM to 100 pM, with a detection limit of 74 pM. These results provide a promising strategy for real-time in situ monitoring of L-cysteine in clinical applications.
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Nano-Micro Letters
·
2024
·Vol. 16
·期 1
·1-16
·
IF 31.6
Wang Wenxiao,Wang Yaqi,Yin Feifei,Niu Hongsen,Shin Young-Kee,Li Yang,Kim Eun-Seong,Kim Nam-Young
An optoelectronic memristor with bioinspired neuromorphic behavior was proposed based on Ag/TiO 2 Nanowires: ZnO QDs/FTO.
The proposed device establishes superior long/short-term synaptic plasticity in response to electrical and light stimuli, and a neuromorphic computing task is effectively implemented based on its optoelectronic performance.
The device emulated complex biological associative learning behaviors, including the four features of acquisition, extinction, restoration, and generalization.
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Scientific Reports
·
2017
·Vol. 7
·期 1
·1-11
·
IF 4.259
Shen Liyan,Xing Zipeng,Zou Jinlong,Li Zhenzi,Wu Xiaoyan,Zhang Yuchi,Zhu Qi,Yang Shilin,Zhou Wei
Black TiO 2 nanobelts/g-C 3 N 4 nanosheets laminated heterojunctions (b-TiO 2 /g-C 3 N 4 ) as visible-light-driven photocatalysts are fabricated through a simple hydrothermal-calcination process and an in - situ solid-state chemical reduction approach, followed by the mild thermal treatment (350 °C) in argon atmosphere. The prepared samples are evidently investigated by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, N 2 adsorption, and UV-visible diffuse reflectance spectroscopy, respectively. The results show that special laminated heterojunctions are formed between black TiO 2 nanobelts and g-C 3 N 4 nanosheets, which favor the separation of photogenerated electron-hole pairs. Furthermore, the presence of Ti 3+ and g-C 3 N 4 greatly enhance the absorption of visible light. The resultant b-TiO 2 /g-C 3 N 4 materials exhibit higher photocatalytic activity than that of g-C 3 N 4 , TiO 2 , b-TiO 2 and TiO 2 /g-C 3 N 4 for degradation of methyl orange (95%) and hydrogen evolution (555.8 μmol h −1 g −1 ) under visible light irradiation. The apparent reaction rate constant (k) of b-TiO 2 /g-C 3 N 4 is ~9 times higher than that of pristine TiO 2 . Therefore, the high-efficient laminated heterojunction composites will have potential applications in fields of environment and energy.
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Polymer Chemistry
·
2012
·Vol. 3
·期 12
·3296-3300
·
IF 5.321
Fang Cui,Sen Liang,Junhu Zhang,Yehua Han,Changli Lü,Tieyu Cui,Bai Yang
The incorporation of inorganic nanoparticles (NPs) into polymers has been pursued as a route to functional materials. TiO2 is a well known multifunctional inorganic material, however, stabilizing TiO2 NPs in bulk polymer matrices to obtain optically transparent nanocomposites remains a significant challenge. Here, we report an effective strategy for the preparation of bulk transparent TiO2–polymer nanocomposites through the combined use of copolymerization of a novel titanium ion-containing monomer with a liquid–solid reaction. The titanium ions are covalently introduced into polymer chains and transformed into TiO2 NPs directly in the solid-state polymer matrices, which allows the generation of well dispersed TiO2 NPs with small size and narrow size distribution in the entire polymer matrices. The resulting transparent nanocomposites exhibit promising UV-shielding properties and consequently should have direct application in the development of transparent UV-protective materials. Moreover, the surface photocatalytic activity of the nanocomposites is helpful for realizing a pollutant- and bacteria-free surface. Moreover, europium methacrylate (Eu(MA)3) is used as a cross-linking agent, which produces cross-linked structures to enhance the stability of the nanocomposites.
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