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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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 3
·2079-2092
·
IF 2.993
Yang Maiping,Liu Weiqu,Jiang Chi,Liu Chunhua,He Sha,Xie Yankun,Wang Zhengfang
A facile, mild and low-cost approach of the fabrication of self-cleaning cotton textile, which showed excellent superhydrophobic and photocatalytic properties, was proposed. The surface was firstly coated with pure anatase TiO 2 through a sol–gel method catalyzed by glacial acetic acid and then modified by (heptadecafluoro-1,1,2,2-tetrahydrodecyl) triethoxysilane (F-17). The hydrophilic cotton textile turned superhydrophobic with a water contact angle of 160.0°. The wettability, surface morphology and chemical composition of pristine and modified textile were investigated, respectively. Meanwhile, the robustness of chemical solutions, laundering treatment and water pressure of the textile were all verified by exposing to different pH solutions, organic solvents, washing and immersing. Importantly, the textile surface showed outstanding self-cleaning performance toward solid pollutant, daily liquids, oil and even organic contaminant, attributing to the synergetic function of superhydrophobicity and photocatalysis of TiO 2 nanoparticles. Therefore, the self-cleaning textile is an expected material for daily and industrial applications in diverse conditions, even harsh environment.
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ACS Catalysis
·
2025
·
IF 13.1
Yang Zou,Xue Li,Yongqi Zhao,Xiaolong Liu,Shaohua Xie,Fudong Liu,Tingyu Zhu
Defect engineering has attracted great attention due to its important role in promoting metal dispersion and regulating catalytic performance. In this study, a gentle method for stabilizing metal single atoms and adjusting the metal coordination environment was proposed, wherein the chemical etching of a Ti–Si oxide composite by NaOH was employed to construct a defect structure. As a conceptual proof, a defective catalyst loaded with 0.1 wt % Pt was synthesized, which exhibited a complete CO oxidation temperature of 200 °C, a significant 70 °C decrease compared to the conventional catalyst. Characterization and theoretical calculations confirmed that Pt existed as single atoms on the defective catalyst, and O2 was adsorbed and activated at Ti3+ defect sites. Notably, the CO oxidation followed the Mars-van Krevelen (MvK) mechanism, resulting in a remarkably low oxygen activation energy barrier of 0.38 eV on the defective catalyst, significantly lower than that on the conventional catalyst (2.48 eV), consistent with its enhanced low-temperature activity. This work provides a promising strategy for the design of efficient and stable low-load noble metal catalysts on oxide-based supports.
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SENSORS
·
2025
·Vol. 25
·期 10
·3195
·
IF 3.5
Cuiyan Han,Ziao Wang,Jiahong Cui,Shuqi Liu,Liu Yang,Yang Fu,Baolin Zhu,Cheng Guo
This article presents an integrated strategy that couples high-efficiency photocatalytic degradation with low-cost, rapid detection to overcome the main drawbacks of conventional TiO2-based photocatalysts, including a weak visible-light response, rapid charge–carrier recombination, and reliance on expensive instrumentation for dye concentration detection. Platinum-decorated TiO2(Pt/TiO2) was prepared by photoreduction deposition, and systematic characterization confirmed the successful loading of zero-valent Pt nanoparticles onto the TiO2surface, significantly improving charge separation and extending absorption into the visible region. Methylene blue degradation was quantified under ultraviolet (UV) and simulated sunlight; radical-scavenging tests clarified the reaction pathway. In parallel, smartphone images of the reaction mixture were processed in ImageJto extract red–green–blue (RGB) values, which were related to dye concentration through a partial least-squares (PLS) model validated against reference UV–Vis data. Pt/TiO2removed 95.0% of methylene blue within 20 min of UV irradiation and 90.2% within 160 min of simulated sunlight—31.8% and 19.1% faster, respectively, than pristine TiO2. The RGB-based PLS model achieved a coefficient of determination (R2) of 0.961 for the prediction set. By integrating photocatalysis with smartphone-based colorimetry, the proposed method enables rapid monitoring of organic dyes concentration, providing an intelligent and economical platform for industrial wastewater treatment.
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PubMed
高影响因子
CEMENT & CONCRETE COMPOSITES
·
2025
·
IF 13.1
Jihong Jiang,Yanchun Miao,Qianping Ran,Yali Li,Yunjian Li,Zongshuo Tao,Zeyu Lu
Fly ash, a by-product of coal combustion, is a pozzolanic solid waste with annual production of 1.63 billion tonnes, which has been widely used to replace cement clinker to develop sustainable concrete. However, the incorporation of high volumes of inert fly ash significantly reduces the early mechanical strength of concrete due to its low pozzolanic activity. This study presents an innovative strategy to effectively enhance the reactivity of fly ash by utilizing hydroxyl free radicals (•OH), highly reactive oxidative species generated by nano-TiO 2 under UV light excitation. Experimental results demonstrated that photoexcited nano-TiO 2 significantly promoted the depolymerization of inert glassy phases in fly ash, resulting in a 28 % increase in Ca(OH) 2 consumption within 72 h. Consequently, the compressive and flexural strengths of mortar at 28 days increased by 37 % and 16 %, respectively, with a strength activity index reaching 95.4 %. In addition, the water absorption and chloride ion diffusion coefficient were reduced by 15 % and 18 %, respectively, due to a more refined pore structure driven by enhanced pozzolanic reactivity. Density Functional Theory (DFT) calculations further revealed that •OH substantially lowered the energy barrier for Si-O-Al bonds cleavage (from 22.93 kcal/mol for OH − to 8.54 kcal/mol for •OH), confirming its superior catalytic efficiency and thermodynamic advantage. In conclusion, the findings confirm that photoexcited nano-TiO 2 can serve as an effective activator for enhancing the utilization efficiency of fly ash in sustainable concrete.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2025
·
IF 14.3
Martin C. Koo,Yu Zhang,Bo Cai,Chen-Ming Liang,Shao-Hang Shi,Hua-Long Peng,Shu-Hao Yang,Xiao-Bo Sun,Guang-Sheng Wang
Microwave-absorbing materials (MAMs) play an important role in reducing electromagnetic pollution. However, achieving a balance between low filler loading, low minimum reflection loss (RL min ) and wide effective absorption bandwidth (EAB) for efficient absorption of microwaves remains challenging. In this work, an innovative method of using CO 2 atmosphere annealed Ti 3 C 2 T x MXene (C/TiO 2 ) combined with nickel nanowires (NiNW) via ultrasonic treatment was performed to yield C/TiO 2 /NiNW (CTN) composites with abundant NiNW/TiO 2 contacts. The electromagnetic (EM) parameters of the as-synthesized composites were closely studied through a series of experiments and computed theoretical calculations. Through the establishment of built-in electric fields (BIEFs) at the NiNW/TiO 2 interface, the derived CTN composite demonstrated improved dielectric properties and impedance matching characteristics that are clearly reflected on the microwave absorption performance of our as-synthesized MAMs, with RL min improving by 127.9% from −31.93 dB to −72.77 dB, and widest EAB increasing by 25.9% from 4.25 GHz to 5.35 GHz, at a low filler loading of 10 wt.%. This work investigates the mechanisms by which BIEFs influence EM parameters, providing critical insights into improving microwave absorption performance via BIEF structural design.
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Molecular Catalysis
·
2025
·
IF 4.9
Hui Kang,Quan Shao,Luming Li,Yanlin Zhang,Xin Xiao,Yuefeng Liu
The gas-inducing strategy has proven highly effective in constructing high-density oxide interfaces. In this study, we utilized CO 2 hydrogenation reaction to induce the spontaneous dispersion of In 2 O 3 species on the surface of TiO 2 , forming numerous InO x /TiO 2 interfaces. The 2 %In 2 O 3 /TiO 2 catalyst demonstrated a 33-fold enhancement in reverse water-gas shift reaction (RWGS) performance after dispersion. Multi-technique characterization revealed that H 2 in the reactants reduced In 2 O 3 to partially reduced states (In +(3-x) ), which were more prone to migration. The spontaneous dispersion was not solely driven by the strong interaction (anchoring) ability of the support for In 2 O 3 species. Further mechanistic studies showed that the high-density InO x /TiO 2 interface formed via spontaneous dispersion significantly promoted the formation of formate species during CO 2 hydrogenation, which decomposed into CO at lower temperatures (297 °C), thereby improving catalytic performance. This work highlights the potential of atmosphere-induced structural evolution in catalysis, underscoring the importance of a comprehensive analysis of the activation, migration, and anchoring mechanisms, as well as the catalytic promotion principles of the induced structure.
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MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Yuanmei Xu,Wenbing Chen,Xueshi Li
Much attention has been focused on the fabrication of TiO 2 microspheres due to their excellent properties and attractive potential in many fields. Here, undoped 3D hierarchical TiO 2 microspheres (TMS) were synthesized in situ on Ti mesh using a hydrothermal method by varying NaOH concentration, reaction time and temperature. The 3D TMS grown along the surface of the woven wires of the Ti meshes, using the metal Ti meshes as a substrate, which resulted in improved conductivity. Meanwhile, the original Ti mesh with the macroporosity (due to the 15 % open area of the mesh) can act as fast proton mass diffusion. As a result, the flexible TMS-Ti photoelectrodes exhibit an excellent current density of 1.63 mA/cm 2 at a potential of 1.23 V (vs Ag/AgCl). Therefore, the in situ synthesis of TiO 2 microspheres on Ti mesh is highly desirable for flexible devices.
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COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Jihong Jiang,Han Wang,Junlin Lin,Zhiyong Liu,Laibo Li,Yali Li,Zongjin Li,Lingchao Lu,Yunjian Li,Zeyu Lu
Previous studies primarily considered TiO 2 as a nano-filler to accelerate cement hydration due to the nucleation site effect. However, hydroxyl free radicals (•OH), released from TiO 2 under UV irradiation, also exhibit great potential to accelerate cement hydration owing to their high nucleophilicity arising from unpaired electrons. This study is the first to reveal the accelerating mechanism of •OH generated by photoexcited nano-TiO 2 on cement hydration. Current experimental results indicated that 5.0 wt% addition of photoexcited nano-TiO 2 (under 6 h of UV irradiation during the early curing stage) improved the dissolution rate of tricalcium silicate (C 3 S) by 30 %, followed by a 35 % increase in the hydration degree of cement paste. More importantly, the polymerization degree and high-density content of C–S–H gels were also improved by 26 % and 13 %, accompanied by a 46 % reduction in porosity of the composites. All the aforementioned improvements were attributed to the presence of •OH generated by photoexcited nano-TiO 2 , which significantly accelerated cement hydration by accelerating C 3 S dissolution, facilitating faster nucleation and growth of C–S–H gels. In addition, the Density Functional Theory (DFT) calculations revealed that the accelerating effect of •OH on cement hydration may stem from the stronger interaction between •OH and the Ca ion on the C 3 S surface compared to the water molecule, and the increased surface nucleophilicity due to the dispersion of unpaired elections from •OH to all the O ions in the surface layer. These findings provide a high-efficiency approach to accelerate cement hydration by photoexcited nano-TiO 2 , thereby paving the way for the development of advanced and sustainable cement-based materials.
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DESALINATION
·
2025
·
IF 9.8
Yixin Ji,Zhongmin Su,Xiaochun Cui,Zhi Geng,Chi Wang
In recent years, nanofiltration (NF) membranes have garnered significant attention for water treatment and reuse applications, owing to their high separation efficiency, surface charge characteristics, and other advantages. However, the conventional support layer structures in NF membranes exhibit high permeation resistance, limiting their overall performance. To address this issue, an ideal through-hole structural support layer effectively minimizes resistance to water infiltration. The advent of advanced high-precision 3D printing technology facilitates the fabrication of such structures. In this study, a support layer with a straight-through pore structure was fabricated using advanced high-precision 3D printing technology, and the PES-COOH active layer was attached to the surface of the support layer via hydrogen bonding, resulting in the PES-COOH@3DP NF membrane. This innovation substantially reduced the permeation resistance, thereby enhancing the permeation flux of the NF process. The permeability of the PES-COOH@3DP NF membrane reached 6.64 L·m −2 ·h −1 ·bar −1 , which is double that of the PES-COOH@UF NF membrane. By incorporating varying concentrations of TiO 2 nanoparticles (0.5 %, 1 %, 1.5 %) into the photosensitive resin material, a hydrophilic support layer doped with TiO 2 nanoparticles was printed using a 3D printer. This improved the NF membrane's hydrophilicity, thereby enhancing its permeation flux. When the feed solution contained 1000 mg·L −1 Na 2 SO 4 , the [email protected] % TiO 2 3DP NF membrane exhibited a permeability of 8.56 L·m −2 ·h −1 ·bar −1 , 1.5 times that of the PES-COOH@UF NF membrane and 22 % higher than the commercial NF90 membrane, while retaining 98.76 % salt and demonstrating strong chlorine resistance. This study underscores the significant potential of advanced high-precision 3D printing technology, establishing it as a strong contender for next-generation NF membrane desalination development.
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Xi Liu,Yanhong Ji,Yinjie Sun,Ming Jing,Zunbo Han,Yunfei Song,Yangzhen Liu,Haoran Chen,Benqiao He
Biodegradable membranes can be decomposed after use, aligning seamlessly with the principles of eco-friendly environmental conservation prevalent in modern society. In this study, poly(butylene succinate) (PBS)/TiO 2 hybrid membranes have been prepared by adding nano-TiO 2 into biodegradable PBS. The impact of nano-TiO 2 on the structure, properties, and degradability of membrane are investigated. The incorporation of nano-TiO 2 has a favorable influence on the mechanical properties of membrane, with tensile strength increased by 80.37 %. When the TiO 2 content is 3 wt%, the hybrid membrane demonstrates a significant enhancement in pure water flux, reaching 56.41 L·m −2 ·h −1 . This flux is 6 times greater than that of pure PBS membrane. Meanwhile, the BSA rejection remains at approximately 95 %. Moreover, the flux recovery of membrane increases from 71.52 % to 96.19 %, and total fouling decreased from 57.09 % to 38.05 %. In long-term use, the permeation flux remains stable between 52.14 and 59.76 L·m −2 ·h −1 , and the BSA rejection is about 93.49 %. Consequently, the membrane maintains its fundamental performance. After service, hybrid membranes can be degraded immediately in alkali solution. This study provides a feasible solution for the development of green, efficient and degradable membranes for wastewater treatment, and opens up a new way for circular economy in membrane technology.
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高影响因子
iScience
·
2025
·
IF 4.1
Yangfan Du,Keyi Han,Mingqing Zhang,Xinyu Zhao,Xin Zhang,Yingbin Liang,Jie He,Shifeng Wang,Yong Li
Environmental pollution poses a pressing global challenge, and photocatalysis represents a promising remediation technology. However, photogenerated carrier recombination remains a critical limitation. In this work, silver quantum dots (Ag QDs) were anchored onto sea urchin-like TiO 2 (U-TiO 2 ) to construct an Ag–TiO 2 interfacial electron transfer channel. This channel facilitated rapid carrier separation and migration, thereby effectively suppressing recombination. Moreover, the Ag QDs exhibited a pronounced localized surface plasmon resonance (LSPR) effect that broadened the light absorption range into the visible and near-infrared regions. Under LSPR excitation, the electron chemical potential in Ag QDs was elevated, further enhancing photocatalytic activity. Additionally, the unique urchin-like morphology of U-TiO 2 provided a large specific surface area, enhancing pollutant adsorption and offering abundant reactive sites. Benefiting from the synergy between the interfacial electron transfer channel and LSPR, the Ag QD–modified U-TiO 2 photocatalyst exhibited outstanding degradation performance and great potential for environmental purification applications.
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