INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2024
·Vol. 25
·期 19
·10253
·
IF 4.9
Wei Chen,Qi Yan,Junjiao Yang
Titanium dioxide thin films on the inner wall of quartz tubes were prepared in situ by the sol–gel method. Meanwhile, copper and cerium were loaded onto the surface of the titanium dioxide thin films to enhance photocatalytic activity and broaden the range of light absorption. X-ray diffractometer, X-ray photoelectron spectroscopy, scanning electron microscopy, energy dispersive X-ray spectrum, N2gas adsorption, UV diffuse reflectance spectroscopy, electron paramagnetic resonance, photoluminescene spectroscopy, and so on were used to characterize the structure, morphology, chemical composition, and optical properties of the prepared photocatalyst. Methylene blue (MB) was used as a simulated organic pollutant to study the photocatalytic performance of the photocatalyst, which was a translucent, structurally stable, and reusable high-efficiency photocatalytic catalyst. Under UV lamp irradiation, the MB photodegradation efficiency was 94.5%, which reached 91.2% after multiple cycles.
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PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Le Zhang,Rui Li,Hao Ding,Daimei Chen,Xuan Wang
Coatings with superamphiphobicity and photocatalytic degradation properties to achieve excellent self-cleaning performance have received extensive attention. Herein, TiO 2 -SiO 2 composite particles with micro-/nanoscale hierarchical structures were fabricated by hydrophobic agglomeration. The TiO 2 -SiO 2 was modified with 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane (PFDTS), and then it was sprayed onto the surfaces of substrates to obtain TiO 2 -SiO 2 /PFDTS coatings. The coating surface exhibited superamphiphobicity and low adhesion properties. The contact angles (CAs) of water, ethylene glycol, glycerol, and hexadecane on the coating surface were 163.5°, 154.6°, 157.3°, and 150.2°, respectively. The slide angles (SAs) of the above droplets on the coating surface were 0.4°, 2.7°, 1.6°, and 11.1°, respectively. In addition, 80.9 % methyl orange solution (10 ppm) was degraded by the TiO 2 -SiO 2 /PFDTS under UV irradiation in 60 min, demonstrating an excellent photocatalytic degradation performance. It also had good adaptability to different substrates, liquids with different properties, and outdoor environments. The results of a mechanistic study showed that SiO 2 and TiO 2 were connected by the carbon chains of modifiers. PFDTS and TiO 2 -SiO 2 might be combined by chemical bonds or surface carbon chains. The hierarchical structure of TiO 2 -SiO 2 and the low surface energy of PFDTS resulted in the superamphiphobic property of the TiO 2 -SiO 2 /PFDTS coating.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Xiaobo Han,Junting Yang,Hengbin Zhao,Qingchun Wang,Fei Ruan,Weixiang Shang,Jinxiao Bao,Yuwei Ma
The construction of a heterojunction with multichannel charge transfer represents an effective strategy for achieving efficient visible light photocatalytic hydrogen production. In this study, the TiO 2 /CdS/Co 2 P ternary photocatalyst was synthesized by stepwise assembly method. The UPS and work function(Φ) results confirmed the band structure and associated band bending of TiO 2 /CdS/Co 2 P, the multichannel electrons transfer from CdS to TiO 2 and CdS to Co 2 P can induce more charge carriers to participate in photocatalytic reaction. Moreover, combine with the results of 3D model charge density and photoelectric performance characterization, proves that the as-prepared ternary photocatalyst accelerates the transfer of photo-generated electrons and reduces the charge recombination rates. According to the Gibbs free energy results, Co as the additional active site is beneficial for hydrogen desorption, thus achieving a high hydrogen production result. Based on the synergistic effects, TiO 2 /55CdS/5.5Co 2 P presented a relatively high hydrogen evolution rate of 250.9 μmol h −1 under the visible light irradiation (λ ≥ 420 nm), which is almost 2 times higher than CdS/5.5Co 2 P (122.8 μmol h −1 ). This work provides theoretical guidance and practical insights for constructing ternary heterojunction structures with central-to-bilateral electron migration to achieve efficient visible-light photocatalytic hydrogen production.
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JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Jianglin Tu,Jinwang Li,Zhefei Pan,Xun Zhu,Dingding Ye,Yang Yang,Hong Wang,Liang An,Rong Chen,Qiang Liao
Photoelectrochemical water splitting represents a promising route for converting solar energy into hydrogen, but sluggish reaction kinetics associated with inefficient charge separation and migration, and poor stability limit solar-to-hydrogen conversion. In this work, we develop a N-doped-CdS/TiO 2 -nanorods heterojunction photoanode for photoelectrochemical water splitting by anchoring CdS on TiO 2 nanorods followed by nitrogen doping. The light harvesting is significantly enhanced and the charge separation and migration are promoted due to the formed heterojunction and nitrogen doping, which greatly enhances the water oxidation reaction. As a result, the photoelectrochemical cell with the optimized N-doped-CdS/TiO 2 -nanorods heterojunction photoanode yields a hydrogen production rate of 42.6 μmol cm −2 h −1 , which is 2.51 times higher than that of the TiO 2 -nanorods photoanode. In particular, doping nitrogen atoms into CdS greatly alleviates the photocorrosion problem. Therefore, the newly-developed photoanode exhibits excellent stability under a continuous 10-h running.
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Sustainable Materials and Technologies
·
2025
·
IF 9.2
Dong Wang,Hongyu Zhang,Ping Yang,Xiao Zhang
A novel approach is developed to construct Z -scheme heterojunctions via growing SnO 2 nanoparticles on Pt decorated hollow TiO 2 bowl nanoarrays (TBN) towards efficient photogenerated charge carrier separation and transfer to enhance the redox ability of resulting catalysts. Namely, sample TBN was fabricated using hollow carbon spheres as templates, in which highly crystalline TiO 2 nanoparticles (less than 10 nm) were assembled into nanoarray to construct hollow bowl spheres. Homogeneously distributed small Pt nanoparticles in TBN govern the growth of SnO 2 nanoparticles via a solvent thermal route and finally to create Z -scheme TiO 2 /Pt/SnO 2 heterojunctions. Pt loading between SnO 2 and TBN components improved photogenerated charge carrier separation and transfer efficiencies and enhanced photocatalytic performance. TiO 2 /Pt/SnO 2 heterostructure samples exhibited improved performance for tetracycline hydrochloride removal with a pseudo-first-order kinetic reaction constant of k = 0.080 min −1 which were 3.8 and 6.7 times of those of TBN (k = 0.012 min −1 ) and TBN/SnO 2 composites (sample TS, k = 0.021 min −1 ), respectively. Moreover, the photocatalytic hydrogen generation rate of TiO 2 /Pt/SnO 2 heterostructures without using co-catalyst was 3511.9 μmol·g −1 ·h −1 which was 2.3 times of that of sample TS using Pt as co-catalyst. These results provided new sights for synthesis of photocatalysts especially for the removal of antibiotic pollutants.
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Materials Today Sustainability
·
2024
·
IF 7.1
Guilu Qin,Yifan Liu,Ruhumuriza Jonathan,Baoshan Wu,Xian Jian
TiO 2 semiconductor has the disadvantages of energy bandwidth, low photo-quantum efficiency, and electron-hole pair easy recombination, which makes TiO 2 semiconductor photocatalytic materials cannot be widely used efficiently. Here, a simple and low-cost method is used to prepare TiO 2 /C/Cu hybrid by in-situ carbon reduction by chemical vapor deposition. During high-temperature calcination, an amorphous carbon is formed on the surface of anatase TiO 2 , and CuO is reduced by in-situ carbon to obtain Cu. Partial Cu-doping into TiO 2 introduces defects, and in-situ Cu and C loads act as electron traps to reduce photogenerated electron/hole recombination. Compared with the original TiO 2 , the TiO 2 /C/Cu hybrids have a narrow band gap (2.77 eV) and abundant defect active sites and have excellent photocatalytic activity to improve the degradation of formaldehyde (HCHO) and methyl orange (MO) under visible light. In addition, after 4 cycles, the degradation of HCHO and MO still maintained excellent stability. This innovation has many potential applications in the future, including air purification and industry.
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ACS Applied Nano Materials
·
2025
·
IF 5.5
Yingkai Liu,Lei Liu,Yujiang Li,Shaoyu Liu,Weibin Zhang,Ruifeng Zhang,Yao Liu,Qian Rong,Jie Zheng
The regularly ordered core–shell nanorods provide an effective transport channel for the adsorption and desorption of the target molecules. However, it remains a great challenge to precisely control the shell thickness of the ordered core–shell nanorods and improve the catalytic activity of their surfaces due to the complexity of the reaction system, especially by enhancing their selectivity to short-chain alcohols. Herein, we propose ZnO/TiO2 core–shell nanorod arrays (NRs) with different shell thicknesses prepared by electron beam evaporation and found that they possess advanced selectivity for short-chain alcohols. The response time of a ZnO/TiO2 core–shell NR with a TiO2 shell of 30 nm to 100 ppm isoamyl alcohol is 17 s. Its response to 100 ppm of isoamyl alcohol is 807, which is approximately 158 times that of the pure ZnO NR. The ZnO/TiO2 NR (30 nm) sensor exhibited excellent selectivity for methanol, ethanol, isopropanol, n-butanol, and isoamyl alcohol. The response to alcohols increased with the increase of the alcohols’ chain length. Its sensing mechanism for short-chain alcohols is explained in terms of adsorption energy, acidity, and electronegativity of H in organic groups by density functional theory in detail. Our results open an alternative route for the design of sensitive materials for the selective detection of short-chain alcohols.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ying Xu,Kang Xue,Minhua Ai,Zehao Han,Chengxiang Shi,Ruijie Gao,Xiangwen Zhang,Ji-Jun Zou,Lun Pan
Dehydrogenation reaction occurs for the hydrogen release process of liquid organic hydrogen carriers (LOHCs), the regenerative cooling of advanced aircraft, etc. But the synergistic effects of Pt active sites are still ambiguous. Herein, a series of Pt-based catalysts with tunable Pt 0 -Pt δ+ sites were fabricated by changing the ratio of highly dispersed defected TiO 2 on MCM-41 (M41) for efficient dehydrogenation of methylcyclohexane (MCH). The characterizations indicate TiO 2 nanoparticles (NPs) are highly dispersed on M41 support, and possess abundant Ti 3+ /oxygen vacancies. The increase of TiO 2 loading amount can enhance the interaction between Pt NPs and TiO 2 , which increases Pt δ+ /Pt 0 ratio gradually. The dehydrogenation test and theoretical results confirm that the synergistic effect of Pt 0 and Pt δ+ sites contributes the optimal dehydrogenation performance, in which Pt 0 promotes the consecutive C–H bond cleavage and Pt δ+ significantly decreases the desorption energy barrier for H 2 and toluene (TOL). Specifically, the MCH conversion (when applied for LOHCs) is ca. 88 % and the selectivity of TOL is over 99.5 % under 1.0Pt/0.5TiO 2 /M41, while the high MCH conversion of 90 % and TOL selectivity of more than 86 % are achieved under 1.0Pt/1.0TiO 2 /M41 (as regenerative cooling for hypersonic vehicle). This work provides the approach of modulating the synergistic active sites to obtain high-performance dehydrogenation catalyst.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·Vol. 53
·期 6
·3167-3177
·
IF 2.2
He Jiangyi,Tu Jianyong,Xu Jianfeng,Chen Xu,Chen Xiang,Wang Dongying
Titanium carbide (TiC) exhibits excellent chemical stability and high electrical conductivity, making it suitable for composites with unique structures and exceptional absorption abilities. In this work, TiO 2 @TiC composites with varied morphology were synthesized by oxidizing TiC at 400°C, for various durations. With the increase of oxidation time, small white TiO 2 particles grew in situ on the surface of TiC particles, ultimately leading to the formation of a continuous structure in which TiO 2 covered the surface of the TiC particles. These results indicate that the impedance matching and electromagnetic wave (EMW) absorption properties of TiO 2 @TiC composites can be modified by adjusting the oxidation time. The minimum reflection loss (RL min ) of the highly oxidized TiO 2 @TiC composite (TO-4 sample) reached −16.2 dB at a thickness of 2.9 mm. When the thickness was increased from 1.2 mm to 4.7 mm, the composites achieved the broadest effective absorption bandwidth of 13 GHz (from 5 to 18 GHz). These enhanced EMW absorption properties can be ascribed to the presence of defects, pores, heterointerfaces, TiO 2 , and TiC within the composites, which induce dipole polarization loss, interface polarization loss, and conduction loss. This practical solution provides a method for preparing TiO 2 @TiC materials with EMW-absorbing properties using oxidation technology.
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Journal of Energy Storage
·
2025
·
IF 9.8
Yongjie Huang,Yuqing Chen,Qing Xu,Chunyan Xu,Liying Yang,Ningyi Jiang,Jibin Zhong,Xinghan Zhao,Shougen Yin
Lithium‑sulfur (Li S) batteries are regarded as a potential candidate of next-generation energy storage devices. However, the poor long-term cycling performance arose from shuttle effect remains a challenge. The recent studies have shown that two dimensional (2D) MXenes have great potential in high efficient Li S cells due to strong adsorption ability for lithium polysulfides (LiPSs) and effective catalytic activity for rapid kinetics. Herein, a polypropylene separator modified by a three-dimensional (3D) TiO 2 -Ti 3 C 2 T x MXene@CNTs heterostructure using sulfur templates combined with H 2 O 2 partial oxidation treatment is proposed to alleviate the shuttle effect and improve the overall utilization efficiency of sulfur in Li S batteries. The as-prepared separator effectively enhances the LiPSs trapping ability and significantly reduces the oxidation overpotential of Li 2 S, demonstrating high catalytic efficiency and sufficient conductivity to promote the transformation of LiPS to Li 2 S and thus accelerating the transformation kinetics of Li S batteries. Remarkably, the TiO 2 -MX@CNTs modified separator with 1.3 mg cm −2 sulfur loading enables a stable capacity of 859 mAh g −1 after 300 cycles at 1C with a capacity decay rate of approximately 0.035 % per cycle, suggesting promising potential for practical applications. This work presents a new method to regulate the electrochemical performance of Li S batteries.
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 43
·18558-18568
·
IF 2.7
Ali Baqaei,Ali Asghar Sabbagh Alvani,Hassan Sameie,Federico Rosei
We designed and fabricated a photocatalyst made of reduced titanium dioxide nanorods (TiO2−x NRs) that incorporates silver nanoparticles (Ag NPs) and reduced graphene oxide (rGO) sheets, to narrow the band gap and improve the photoinduced degradation of methylene blue (MB). The morphological characterization showed that Ag NPs and rGO sheets were well-deposited on both the top surface and the outer walls of vertically oriented 1D TiO2−x NRs. Energy dispersive spectroscopy and specific surface area analyses confirmed the presence of both Ag NPs and rGO sheets and the as-obtained TiO2−x/Ag/rGO sample exhibited a large specific surface area (153.7 m2 g−1). Moreover, X-ray diffraction patterns contained peaks characteristic of tetragonal rutile TiO2 and confirmed that there is no phase change after reduction treatment. The optical investigation revealed that the formation of Ti3+ ions, surface defects and oxygen vacancies were considered as major reasons for the red shift of the absorption edge towards the visible region (546 nm) compared with pristine TiO2 NRs. The incorporation of Ag NPs and rGO with TiO2−x NRs improved the light absorbance and the narrowing of the TiO2−x bandgap energy (from 2.95 to 1.97 eV) as a result of the SPR effect of Ag NPs and the reduced light reflection in the presence of rGO. Therefore, among the various as-prepared photocatalysts, the TiO2−x/Ag/rGO (2% wt) photocatalyst showed the best performance, degrading almost 100% of MB under 120 min visible light irradiation. Kinetic studies confirmed that degradation reactions over all photocatalysts followed first order kinetics. The photodegradation rate toward MB over TiO2−x/Ag/rGO (2% wt) is 6.45, 1.85, and 1.6 times higher compared to that of pristine TiO2 NRs, TiO2−x and TiO2−x/Ag, respectively. The TiO2−x/Ag/rGO composite proves to be an exceptionally efficient photocatalyst for water treatment.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Shuying Yang,Fan Zhang,Jinping Zhao,Haijiao Kang,Qing Ke
Silver/titanium dioxide (Ag/TiO 2 ) nanoparticles, renowned as effective inorganic antibacterial agents with a wide spectrum of activity and minimal resistance induction, encounter challenges when incorporated into organic substrates. This integration often leads to particle aggregation, resulting in a substantial reduction in antibacterial efficacy. This study devised a novel approach involving loading Ag/TiO 2 nanoparticles onto polyurea microcapsules (PUMC), forming hybrid-shelled microcapsules (Ag/TiO 2 -PUMC) using silane coupling agents. The preparation of polyurea microcapsules offers the advantages of rapid synthesis and mild reaction conditions, facilitating industrial-scale production. Additionally, loading Ag/TiO 2 nanoparticles onto polyurea microcapsules helps alleviate the aggregation issue, and the organic nature of polyurea microcapsules enhances compatibility with organic substrates. Characterization techniques, including SEM, TEM, FTIR, XRD, UV–visible absorption spectroscopy, EPR and thermogravimetric analysis, were employed to confirm the successful grafting of Ag/TiO 2 nanoparticles onto the PUMC. A comparative analysis between the two silane coupling agents, KH550 and KH792, revealed that the dual amino-functional silane coupling agent, KH792, played a pivotal role in chain extension during the microcapsule self-polymerization process. The antibacterial activity of the Ag/TiO 2 -PUMC was evaluated against Escherichia coli and Staphylococcus aureus . Remarkably, the hybrid-shelled microcapsules exhibited outstanding antibacterial efficacy, achieving a 99.99% antibacterial rate within just 0.5 hours. This performance surpassed unmodified Ag/TiO 2 nanoparticles, highlighting the enhanced antibacterial efficacy of the hybrid-shelled microcapsule structure. This study presents a successful synthesis strategy for inorganic/organic hybrid-shelled antibacterial microcapsules and provides valuable insights for refining inorganic antibacterial agents. The demonstrated approach holds substantial promise for advancing the field of organic antibacterial materials.
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