ACS Catalysis
·
2026
·
IF 13.6
Mei Yang,Fanwei Kong,Yanmei Ma,Shujia Wang,Tiantian Su,Junli Guo,Yan-Yan Song,Zhida Gao,Junjian Zhao
Operando tracking of nanoscale catalytic dynamics is essential for elucidating transient interfacial events that dictate reaction efficiency. Here, we report a confined TiO2 nanopipette reactor integrated with Au and Pt nanozymes that enables single-entity, bubble-resolved tracking of plasmon–photocatalytic-coupled cascade catalysis. Within the nanoconfined channel, glucose oxidation on Au generates H2O2, which is subsequently decomposed on Pt to produce periodic O2 nanobubbles that transduce catalytic activity into well-defined ionic current oscillations. Quantitative kinetic descriptors, including the oscillation frequency, dwell time (τoff), and event interval time (τon), are extracted with high reproducibility. Under 532 nm excitation, the localized surface plasmon resonance (LSPR) of Au induces hot-electron injection into TiO2, promoting charge separation and accelerating Pt-catalyzed H2O2 decomposition. This coupling system enhances the O2 generation rate while reducing both τoff and τon. The nanoconfined environment enables robust catalytic detection down to 10 μM glucose, far below the macroscopic limit. Macro–micro correlated measurements further reveal synergistic regulation of the cascade kinetics by illumination and substrate concentration. This work establishes a versatile operando platform for quantifying nanoscale bubble dynamics and light-regulated cascade catalysis, offering opportunities for engineering responsive catalytic systems and next-generation microreactors.
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高影响因子
WATER AIR AND SOIL POLLUTION
·
2026
·Vol. 237
·期 13
·750
·
IF 3.5
Meng Chunhui,Li Yuena,He Qitong,Hao Yue,Yin Wenjun,Zhou Huang,Li Ping
Titanium dioxide (TiO 2 )-mediated photodynamic therapy has emerged as a promising antibacterial strategy. To further enhance the photocatalytic activity of TiO 2 , we have rationally designed cobalt-doped TiO 2 nanocomposites (C/Co/TiO 2-x ) via a sol–gel synthesis approach. The synthesized materials were systematically characterized using transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV–Vis diffuse reflectance spectroscopy (UV–Vis DRS). Structural analyses confirmed the presence of Ti, O, C, and Co elements, exhibiting a block-like morphology with a dominant anatase crystalline phase. Notably, the optimized material exhibits an extended visible-light absorption edge (762 nm) accompanied by a reduced band gap (1.63 eV), demonstrating significantly enhanced visible-light harvesting efficiency. Antibacterial evaluations revealed that the C/Co/TiO 2-x nanocomposite (5 mg/mL) achieved complete inactivation of Staphylococcus aureus ( S. aureus ) and Escherichia coli ( E. coli ) within 60 and 100 min, respectively, under visible-light irradiation (7 W LED). Radical trapping experiments identified photogenerated holes (h + ) and hydroxyl radicals (·OH) as the predominant reactive species responsible for bacterial inactivation. In vitro cytotoxicity assessment demonstrated excellent biocompatibility of the material. This study successfully illustrates the synthesis of C/Co/TiO 2-x nanocomposites, which exhibit promising potential for antibacterial applications.
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Polymers
·
2026
·Vol. 18
·期 7
·872
·
IF 5.8
Lingxiao Peng,Wenjie Si,Yuhui He,Nanying Ning,Jianfeng Wang
Dielectric elastomer actuators (DEAs) are attracting much attention as candidates for next-generation flexible actuation. Among various DE matrices, polyacrylate rubber (AR) is especially promising owing to their intrinsically high dielectric constant (εr) and good mechanical performance. In particular, its mechanical behavior is close to that of porcine bladder tissue, making it a potentially good material for soft biomedical actuators for artificial bladder constructs. To achieve high actuated strain, which requires highεr, high breakdown strength, and low elastic modulus, an AR DE composite filled with silane-functionalized TiO2was fabricated, exhibiting good electromechanical performance enabled by strengthened interfacial polarization. To improve compatibility between TiO2and AR matrix, TiO2was preferentially modified with a silane coupling agent (CA) that features a double bond as its functional group, which can be introduced on TiO2surface and participate in vulcanization with AR, thereby forming co-crosslinking bridges that strengthen interfacial bonding, improve filler dispersion, and increase interfacial polarizability within the matrix. As a result, at relatively low filler loadings, the composite exhibits a significantly increasedεr, while maintaining low modulus, low dielectric loss and high elasticity. The 10 CA@TiO2/AR composite exhibits a maximal actuated strain of 7.9% at 31.9 kV/mm without pre-stretch, which is 1.48 times that of pure AR and 1.32 times that of the 10 TiO2/AR composite.
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PubMed
高影响因子
ChemistrySelect
·
2026
·Vol. 11
·期 13
·e05110
·
IF 2.3
Jiyang Zuo,Jiheng Ding,Hao Wang,Hao Rong,Xu Zhang,Xin Fan,Kai Xie,Yuna Zhang,Qi Yang,Zhisen Shen,Xiaoqing Liu
Chronic wound management requires multifunctional biomaterials integrating antibacterial and tissue-repair capacities. To address this clinical demand, we developed a composite hydrogel by incorporating quercetin-loaded TiO 2 @CNTs heterojunctions into chitosan, leveraging their complementary properties: chitosan's excellent biocompatibility as the matrix, quercetin's natural anti-inflammatory effects, TiO 2 ’s photocatalytic antibacterial activity, and CNTs’ structural reinforcement. The TiO 2 @CNTs heterojunction was synthesized hydrothermally, with characterization confirming uniform TiO 2 dispersion on CNTs, anatase-phase crystallinity, and robust interfacial bonding. The composite hydrogel showed thermoresponsive gelation at 37 °C, favorable porcine skin adhesion, and a porous microstructure. In vitro tests revealed >90% L929 fibroblast viability (25 µM quercetin optimal), enhanced cell migration, and hemolysis rates <5%. Antibacterial assays against Escherichia coli demonstrated significantly larger inhibition zones (18.2 ± 1.3 mm) and lower bacterial counts for the composite hydrogel than those for the chitosan-only or control groups. In a rat skin wound model, the hydrogel achieved 60% wound closure at 7 days, outperforming the chitosan (50%) and control (40%) groups. Furthermore, histological and blood biochemical analyses confirmed no systemic toxicity, organ damage, or TiO 2 /CNT accumulation in major organs. This multifunctional hydrogel exhibits synergistic antibacterial, biocompatible, and pro-healing properties, making it a promising candidate for advanced chronic wound care applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Enze Li,Yuhao Li,Qihao Wang,Lei Li,Weiping Xiao,Qi Wu,Lei Wang,Zexing Wu
Overcoming the sluggish water dissociation kinetics in alkaline media and seawater remains a critical challenge for scalable green hydrogen production, requiring the development of efficient water-splitting electrocatalysts. Here, we conducted an Ru-Co/TiO 2 catalyst, which features an oxygen-vacancy-rich titanium dioxide (TiO 2 ) support anchoring ruthenium (Ru) and cobalt (Co) species, for hydrogen evolution reaction (HER) in alkaline electrolytes. Comprehensive spectroscopic analyses reveal that the microwave-induced oxygen vacancies facilitate the effective anchoring and high dispersion of Ru-Co bimetallic sites while concurrently enhancing electronic interactions. This markedly reduces the kinetic barrier for water dissociation to adsorbed hydrogen intermediates and optimizes the hydrogen adsorption/desorption behavior, thereby synergistically boosting HER activity. Far surpassing its single-metal counterparts, the resulting Ru-Co/TiO 2 maintained stable operation for over 100 h, delivering remarkably low overpotentials at 10 mA cm −2 : 51 mV in 1.0 M KOH, 69 mV in alkaline seawater, and 293 mV in natural seawater. This work demonstrates general and scalable approaches that integrate support defect engineering with trace-level bimetallic modulation, providing valuable insights into the design of low-noble-metal, high-performance electrocatalysts for practical water and seawater electrolysis.
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高影响因子
Journal of Materials Chemistry A
·
2026
·
IF 9.2
Wenlong Yang,Zhenghui Ma,Guoli Fan,Xiaoyan Pu,Feng Li
Photocatalytic CO2 reduction to produce high value-added hydrocarbons has attracted significant attention, yet its overall efficiency remains unsatisfactory. In this work, a micro-liquid film reactor featuring enhanced mixing efficiency was utilized to realize the doping of single Fe atoms into the lattice of TiO2, enabling the generation of abundant atomically dispersed Feδ+ -Ov-Ti structures (Ov: oxygen vacancy). The results showed that compared to pristine TiO2, the optimized Fe-TiO2 photocatalyst bearing a 4 wt.% Fe content exhibited 15.2 times higher activity, with a significant shift in the predominant product from CO to CH4, as well as an impressively high CH4 formation rate of 29.2 μmol•g-1•h-1 , surpassing those over most of the state-of-the-art TiO2-based photocatalysts previously reported. It was revealed that the incorporation of single-atom Fe could reduce the bandgap of TiO2 matrix and surface atomically dispersed Feδ+ -Ov structures could improve the separation efficiency of photogenerated charge carriers and facilitated the adsorption and activation of CO2 and the formation and stabilization of key *CO reaction intermediate, thereby accelerating photocatalytic CO2 reduction to produce CH4. The present work affords a simple and efficient strategy for designing single-atom Fe-regulated TiO2-based photocatalysts for a synergistic enhancement of CO2 photoreduction activity and CH4 selectivity.
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高影响因子
RARE METALS
·
2026
·Vol. 45
·期 10
·e70671
·
IF 12.1
Zhidan Wang,Rui Li,Yawen Wang,Yunfang Wang,Caimei Fan,Jianxin Liu,Shan Gao,Jiancheng Wang
en This link goes to a English section zh This link goes to a Chinese section Photocatalytic acetylene (C 2 H 2 ) semihydrogenation is a green route for ethylene (C 2 H 4 ) production, yet the activity–selectivity trade-off caused by imbalanced adsorption/activation of reactants and products remains a core challenge. Herein, we realize precise regulation of Pd oxidation states (Pd 0 , Pd δ + , and Pd 2+ ) on anatase TiO 2 nanocubes via a mild reduction strategy, fabricating a Pd δ + /TiO 2 photocatalyst with intermediate valence of Pd sites. Systematic characterizations and theoretical calculations reveal that Pd δ + optimizes the d-π/d-π* orbital interactions between Pd and C 2 H 2 /C 2 H 4 , achieving a moderate adsorption strength that balances efficient C 2 H 2 activation and rapid C 2 H 4 desorption. Pd 0 causes overadsorption/overhydrogenation, whereas Pd 2+ leads to weak substrate activation. Consequently, Pd δ + /TiO 2 achieves nearly 100% C 2 H 2 conversion and ∼90% C 2 H 4 selectivity, with a record-high turnover number (TON) of ∼4.1 × 10 4 and excellent cycling stability. This work clarifies the electronic mechanism of Pd valence engineering in carrier dynamics and modulating orbital hybridization, providing a new strategy for the rational design of C 2 H 2 semihydrogenation photocatalysts. 摘要 en This link goes to a English section zh This link goes to a Chinese section 光催化乙炔(C 2 H 2 )半加氢是一种制备乙烯(C 2 H 4 )的绿色路径,但反应物与产物吸附与活化不均衡引发的活性-选择性权衡问题仍是核心难题。本文通过温和还原策略,在锐钛矿二氧化钛纳米立方体上实现钯氧化态(Pd 0 、Pd δ + 、Pd 2+ )的精准调控,制备出活性位点为中间价态钯的 Pd δ + /TiO 2 光催化剂。系统表征与理论计算结果表明,Pd δ + 能够优化钯与C 2 H 2 /C 2 H 4 之间的d-π/d-π* 轨道相互作用,形成适中的吸附强度,兼顾高效活化乙炔与乙烯快速脱附, Pd 0 会造成吸附过强并引发过度加氢,而Pd 2+ 对底物活化能力较弱。因此,Pd δ + /TiO 2 可实现接近 100% 的乙炔转化率和约 90% 的乙烯选择性,周转数(TON)高达4.1 × 10 4 ,同时具备优异的循环稳定性。该研究阐明了调控钯价态对载流子动力学及轨道杂化进行调控的电子作用机制,为乙炔半加氢光催化剂的合理设计提供了新思路。
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 3
·123137
·
IF 7.5
Fenhong Song,Ruibo Zhang,Qi Qi,Long Ma,Gang Wang,Wenguang Wang,Jing Fan
The narrow light-absorption range and fast charge carrier recombination in semiconductor photocatalysts remain major bottlenecks limiting photocatalytic hydrogen evolution efficiency. In this work, SnO 2 /g-C 3 N 4 /TiO 2 ternary Type-II heterojunctions were rationally constructed via a hydrothermal-calcination two step strategy. Triethanolamine (TEOA) was employed as a sacrificial agent during the photocatalytic hydrogen production reaction. Different from traditional simple component mixing, SnO 2 is deliberately designed as an electron mediator to bridge g-C 3 N 4 and TiO 2 , forming a directional cascade charge transfer channel for efficient carrier separation. DFT theoretical simulations further verify that the introduction of TiO 2 optimizes the band structure, reduces the work function, and promotes interfacial electron transfer, thus significantly enhancing photocatalytic performance. The optimized 0.20SnO 2 /g-C 3 N 4 /TiO 2 sample delivers a maximum H 2 evolution rate of 4.80 mmol/g/h, 2.38-fold higher than that of bare TiO 2 . Stability assessments confirmed the material's exceptional cycling durability, a characteristic primarily ascribed to the establishment of type II heterojunctions. This architectural configuration facilitates effective segregation and mobility of photoinduced charge carriers while simultaneously suppressing recombination of electron-hole pairs. The materials' superior photoelectrochemical characteristics further enhance their capacity for light-driven hydrogen generation through catalytic processes. These discoveries provide new perspectives and innovative approaches for engineering high-performance photocatalytic systems.
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高影响因子
CATALYSIS TODAY
·
2026
·
IF 5.1
Shuang Wang,Shuo Wang,Xiao-Qian Feng,Huan Wang,Xuelan Hou,Jin Ye,Yong-Hua Zhao
TiO 2 is a widely studied photocatalyst, but its practical performance is limited by poor light utilization and rapid recombination of photogenerated charge carriers. Herein, a TiO 2 -ZIF-8 heterojunction with a chemically bonded interface was constructed through the formation of Ti-O-Zn interfacial bonds. This design integrates the strong adsorption capacity of ZIF-8 with improved charge separation and transfer across the heterojunction. The optimized TiO 2 -ZIF-8 composite showed markedly enhanced photocatalytic activity, achieving 94.6% degradation of methylene blue within 120 min under simulated solar irradiation. Its apparent rate constant reached k = 0.01508 min -1 , which is 1.55 and 2.38 times higher than those of pristine TiO 2 and ZIF-8, respectively. XPS, FTIR, TEM, and PL results confirm the successful construction of the heterojunction and reveal the key role of Ti-O-Zn bonding in strengthening interfacial interaction and facilitating photogenerated carrier migration. Meanwhile, the strong interfacial interaction improved the structural stability of the composite and helped inhibit nanoparticle agglomeration during photocatalysis. Overall, this work provides new insight into the design of high-performance MOF-based photocatalytic systems through interfacial chemical bond engineering.
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高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2026
·
IF 4.4
Nan Zheng,Xinyue Liu,Meng Lan,Xiaoli Dong,Yubo Zhang
Co-TiO 2-x with abundant OVs made via one-step hydrothermal. • Optimal sample: high NH 3 yield, good stability & selectivity. • Co & OVs enhance N 2 adsorption/activation for sustainable NH 3 . Photocatalytic nitrogen fixation represents a promising green technology for ammonia synthesis, but its efficiency is largely limited by the adsorption and activation of N 2 molecules on catalyst surfaces. In this study, cobalt-doped brown TiO 2-x with abundant oxygen vacancies was successfully synthesized via a simple one-step hydrothermal method. The brown TiO 2-x exhibits excellent light absorption capacity and abundant oxygen vacancies. Cobalt doping further promotes the separation of photogenerated charge carriers and the photocatalytic reduction ability of brown TiO 2-x , while also inducing the generation of additional oxygen vacancies (OVs). These OVs serve as active sites, effectively improving the adsorption and activation of N 2 , and subsequently reducing it to ammonia. Experimental results demonstrate that the photocatalytic nitrogen fixation performance of the Co doped TiO 2-x is significantly improved. The as-fabricated 7%Co-doped TiO 2-x sample achieves an ammonia production rate of 257.58 μmol·g −1 ·h −1 . In addition, it also exhibits good stability and NH 3 selectivity. This work highlights the promise of coupled doping and defect engineering for creating high-efficiency photocatalysts for sustainable ammonia production. Download: Download high-res image (365KB) Download: Download full-size image
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COMPOSITES PART B-ENGINEERING
·
2026
·
IF 14
Liang Zhou,Muhaiminul Islam Shakil,Jingyi He,Xiyue Zhang,Hongbo Wang
Metal-organic framework (MOF)-derived carbon materials exhibit significant advantages for microwave absorption applications, owing to their high electrical conductivity, structural tunability, and abundant intrinsic defects and heterogeneous interfaces. However, achieving an optimal balance between magnetic and dielectric losses remains challenging for most magnetic metal-based MOFs-derived absorbers. In this study, MIL-125(Ti) was prepared as a template, and TiO 2 @C-x composites were synthesized via a two-step pyrolysis method. Experimental results demonstrate that the pyrolysis temperature significantly affects the graphitization degree of the carbon matrix and the formation of TiO 2 nanoparticles, thereby playing a dominant role in the dielectric and microwave absorption properties of the investigated MIL-125(Ti)-derived core-shell TiO 2 @C composites. Notably, the TiO 2 @C-700 composite delivers an effective absorption bandwidth of 3.2 GHz in 9.2-12.4 GHz at a thickness of 2.01 mm. Therefore, the MIL-125(Ti)-derived TiO 2 @C composites fabricated in this study establish a viable and nonmagnetic strategy for designing tunable, lightweight, and high-performance MOF-derived microwave absorbers.
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高影响因子
Surfaces and Interfaces
·
2026
·
IF 6
Ke Liu,Lairong Xiao,Yu Zhang,Zhenwu Peng,Yuxiang Jiang,Yi Liang,Siyuan Tang,Wei Li,Xiaojun Zhao
Etching basalt scales boosts active sites and area, enhancing modification efficacy. • A micro-nano structure (EB/TiO₂) improves coating abrasion resistance effectively. • Excellent corrosion resistance results from a stable air layer during immersion. • Nano-TiO₂ can significantly improve the dispersion properties of basalt scales. Superhydrophobic coatings have increasingly demonstrated unique advantages in corrosion protection for marine engineering applications. However, their practical engineering implementation is often constrained by three key limitations: complex preparation processes, difficulties in large-scale application, and poor mechanical durability. Addressing these challenges, this study develops a multifunctional superhydrophobic coating suitable for room-temperature preparation and scalable application. Stable and cost-effective basalt scales serve as the microstructure foundation for robust superhydrophobic structures. Chemical etching is employed to activate the reactive sites on the basalt scale surfaces. By leveraging the silane bonding characteristics of 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane, the construction of low surface energy treatment and the micro-nano hierarchical structures of basalt scales modified by nano-TiO 2 are accomplished in a single step. The resulting multifunctional superhydrophobic coating exhibits a water contact angle of 155.4°, retaining over 150° even after 60 friction cycles. In a 3.5 wt% NaCl solution, the impedance modulus at 0.01Hz (|Z| 0.01 Hz ) reaches which is six orders of magnitude higher than that of the bare substrate. Additionally, the coating demonstrates exceptional durability and self-cleaning properties. Notably, the entire preparation process is conducted at room temperature, significantly facilitating large-scale engineering applications, mass component processing, and commercial translation.
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