COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yan Wang,Shengzhe Zhao,Yi Yang,Raul D. Rodriguez,Anya Lipovka,Yun Lu,Honglan Huang,Jinju Chen
Ag nanoparticle-decorated Bi 2 O 3 -TiO 2 heterogeneous photocatalysts were successfully obtained by combining facile sacrificial templates and photoreduction . The as-synthesized Ag@Bi 2 O 3 -TiO 2 photocatalysts with a narrow band gap of 2.40 eV exhibited considerable photocatalytic activity to degrade rhodamine B (RhB) and tetracycline hydrochloride (TCH), and the removal efficiency reached 100% and 92%, respectively. Ag@Bi 2 O 3 -TiO 2 photocatalysts also exhibited stable recyclability for the degradation of RhB and TCH. Trapping experiments helped determine the major reactive oxidative species for TCH photodegradation . The desirable photodegradation performance is mainly attributed to improved light absorption , enhanced charge separation, and strong redox capacity of Ag@Bi 2 O 3 -TiO 2 nanostructures with S-scheme heterojunction . This work provides a facile avenue to construct heterogeneous tubular nanostructures with intensive photoabsorbance and effective photocatalysis to degrade organic contaminants.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF PHARMACEUTICS
·
2015
·
IF 3.65
Song Shen,Lin Wu,Jiejie Liu,Meng Xie,Haijun Shen,Xueyong Qi,Yongmin Yan,Yanru Ge,Yi Jin
To facilitate targeting drug delivery and combined therapy, we develop titanium dioxide-encapsulated Fe 3 O 4 nanoparticles (Fe 3 O 4 @TiO 2 NPs). Titanium dioxide (TiO 2 ), which is employed as a sonosensitizer for sonodynamic therapy (SDT), can also be used for the loading of doxorubicin (DOX). The fabricated Fe 3 O 4 @TiO 2 NPs exhibit pH-dependent loading and release of doxorubicin (DOX) in vitro. After incubation with cancer cells, reactive oxygen species (ROS) are generated efficiently upon the irradiation of ultrasound. In the biodistribution experiments, extremely high in vivo tumor accumulation of Fe 3 O 4 @TiO 2 NPs and long-time retention effect are observed. Compared with chemotherapy or sonodynamic treatment alone, the combined therapy demonstrated a synergistic effect, resulting in stronger cytotoxicity and higher therapeutic efficacy. Thus, the constructed NPs are endowed with multifunctions which allow them to selectively deliver combinatorial therapeutic payload to tumor with enhanced therapeutic effectiveness and minimal side effects.
研究领域:
肿瘤学
·
纳米医学
·
药剂学
✓ 已验证
DOI
PubMed
高影响因子
Nanoscale
·
2017
·Vol. 9
·期 42
·16183-16192
·
IF 7.367
Lei Sun,Zhenglin Li,Zhuo Li,Ying Hu,Chong Chen,Chenhui Yang,Baosheng Du,Ye Sun,Flemming Besenbacher,Miao Yu
Photothermal agents (PTAs) with high biocompatibility and therapeutic efficacy have become particularly fascinating, however, knowledge of their photothermal performance is rather limited. Herein, rationally designed core–shell TiO2 nanoparticles have been fabricated using a mild hydrogenation method, where NaBH4 was used as the H2 source. The resultant TiO2 possesses strong optical absorption in the NIR region and remarkable photothermal conversion capability and stability, leading to a high inhibition rate on cancer cells. In particular, its photothermal conversion efficiency is as high as 55.2%, which is 204% that of the fully hydrogenated amorphous TiO2. More importantly, the underlying mechanism is proposed. It is revealed that while the oxygen vacancies induced by the hydrogenation can introduce defect levels in the band gap and enhance the optical absorption, the superfluous oxygen vacancies and defects reduce the photothermal conversion capability and thermal conductivity to a large extent. Controlling the hydrogenation degree and maintaining a certain extent of crystallization are, therefore, crucial to the photothermal properties. This new understanding of the photothermal conversion mechanism may have provided a fresh route to design and optimize PTAs and inspire considerable interest to turn a large variety of semiconductor metal oxides into competent PTAs by appropriate hydrogenation.
研究领域:
材料科学
·
生物医学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Siqi Yu,Bing Han,Yunchao Lou,Zhe Liu,Guodong Qian,Zhiyu Wang
In addition to the extended light absorption, the effective spatial charge separation is a crucial factor for highly efficient metal-oxide semiconductor-based photocatalysts . Herein, a rational design of metal-semiconductor-metal nano heterostructure for enhancing photocatalytic performance is proposed. The semiconductor nanoparticles are integrated with two metals in one single nano heterostructure. The disordered layers are induced on the surface of TiO 2 to promote the light absorption capacity . More importantly, the n-n + junction is fabricated at the contact region between crystalline TiO 2 (n-TiO 2 ) and disordered layers (n + -TiO 2 ). Besides, the Schottky diode and Ohmic contact are formed on n-TiO 2 and n + -TiO 2 , respectively. As a result, the existence of multi-junctions leads to the formation of multiple continuous built-in electric fields, thus remarkably accelerating the spatial separation of charge carriers. The resulting nano heterostructure with multi-junctions (Pt–TiO 2 –H–Ag) exhibits remarkably promoted photocatalytic performance. The maximum hydrogen generation rate of Pt–TiO 2 –H–Ag under solar illumination (18001.0 μmol/h/g) is 8.3, 9.3, and 1.5 times superior to that of Pt-loaded P25 (Pt–P25), Pt loaded TiO 2 (Pt–TiO 2 ), and hydrogenated Pt–TiO 2 (Pt–TiO 2 –H), respectively. Moreover, the photocatalytic performance under visible illumination is significantly enhanced by Pt–TiO 2 –H–Ag. Specifically, the H 2 generation rate of Pt–TiO 2 –H–Ag (2382.7 μmol/h/g) is about 15.1, 17.2, and 1.4 times higher than that of Pt–P25, Pt–TiO 2 , and Pt–TiO 2 –H, respectively. The corresponding apparent quantum efficiency of Pt–TiO 2 –H–Ag is 15.8% (420 nm). The nano heterostructure with multi-junctions also exhibits excellent stability after five cycles, remaining hydrogen evolution rates of 15581.5 and 2211.4 μmol/h/g under solar and visible illumination, respectively. This effective and controllable manufacturing strategy could provide new opportunities to simultaneously extend optical absorption and facilitate the spatial charge separation and transport of wide-bandgap metal-oxide semiconductors.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2019
·Vol. 6
·期 10
·2675-2681
·
IF 5.934
Wei Xu,Lingjun Kong,Hui Huang,Ming Zhong,Yingying Liu,Xian-He Bu
Sn-Based materials are attracting increasing attention for application in sodium-ion batteries (SIBs), due to the ultra-high theoretical capacity of pure Sn. However, low structural stability and poor rate capability restrict their further development. Herein, a facile method is reported to embed Sn nanocrystals into a TiO2/porous carbon (TiO2/C) composite by direct carbonization of a mixture of tetraphenyltin and a Ti-based metal–organic framework. The obtained cylinder-like Sn/TiO2/porous carbon (Sn/TiO2/C) composite is uniformly built from TiO2 nanoparticles, Sn nanocrystals and N-doped carbon. Importantly, pores, formed by the accumulation of nanoparticles, can effectively restrict the huge volume change of Sn during cycling. When evaluated as an anode in SIBs, the Sn/TiO2/C composite not only possessed amazing cycling stability (159.6 mA h g−1 at 1.0 A g−1 after 3000 cycles), but also exhibited excellent rate performance (172.3 mA h g−1 at 1.0 A g−1 and 114.0 mA h g−1 at 10.0 A g−1). These superior properties can be attributed to Sn nanocrystals which enhanced specific capacity and electrical conductivity, and the TiO2/C substrate which improved structural stability, facilitating charge transfer kinetics.
研究领域:
材料科学
·
能量存储
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 9
·683
·
IF 4.3
Hairui Cai,Benjamin Yang,Jie Hou,Ziqi Wang,Zhuo Li
Formaldehyde, a pervasive indoor air pollutant posing significant health risks, has driven extensive research into advanced mitigation strategies to ensure safer living environments. Herein, this study presents a synthesis method for the large-scale production of hydrogenated TiO2(P25) loaded with PtAu nanoalloys (P25(H)-PtAu), using a combination of ball milling and high-temperature annealing. Hydrogenation-induced defect-rich TiO2efficiently improves visible light absorption, enhancing the utilization of visible light in photocatalytic reactions. Mechanochemical ball milling was employed to prepare ultrasmall PtAu nanoalloys with a size of 3.7 ± 0.1 nm, which were uniformly dispersed on the surface of P25(H). Density functional theory (DFT) results indicate that PtAu nanoalloys synergistically enhance charge separation via Schottky junctions and surface reaction kinetics by optimizing reactant adsorption. As a result, P25(H)-PtAu achieves industrially relevant formaldehyde removal efficiency (97.8%) under ambient light conditions while maintaining scalability (10 g batches). This work provides a scalable framework for developing manufacturable photocatalysts, with immediate applications in heating, ventilation and air conditioning systems, and air purifiers.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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.
研究领域:
催化化学
·
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 6
·060523
·
IF 3.1
Hongfeng Liu,Yingshuai Wang,Yusong Wang,Amna Safdar,Feng Wu,Hongcai Gao
Layered transition metal oxides have great potential as cathode materials for sodium ion batteries, but some limitations like structural instability and poor rate performance restricts its further application. To overcome the above issues, a simultaneously modified P2-type cathode of Na0.85Li0.12Ni0.22Mn0.66O2 with 1% weight TiO2 coating (NLNMO-1%wt TiO2) based on doping and coating approaches was prepared by high-temperature solid-state reaction and liquid phase coating. This new strategy reduces the relative content of Mn3+, which suppresses the Jahn-Teller effect and enhanes the structural stability. The as-prepared cathode shows improved rate capability, with a high reversible capacity of 111.4 mAh g−1 at 1 C and a capacity retention of 94.5% after 100 cycles. At 5 C, it maintains a capacity of 87.1 mAh g−1 at 5 C with capacity retention of 81.8% after 400 cycles. Additionally, it provides a stable CEI film, reducing side reactions and electrode pulverization. which could be confirmed by scanning electron microscopy and high-resolution transmission electron microscopy. Overall, this synergistic modification strategy provides a pathway for improving the electrochemical performance of layered oxide cathode materials for sodium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Bo Zhang,Yi Chen,Haonan Zheng,Changhao Li,Lili Ma,Hong Zhang,Baoxiang Wang,Chuncheng Hao
Herein, composites of Co-doped graphitic C3N4 nanosheets and TiO2 nanoparticles (Co-C3N4 NSs/TiO2 NPs) were prepared through a two-step synthetic strategy, and their electrorheological (ER) performance under varied electric field strengths was also researched. The microstructure, chemical elements, and surface morphology of materials were studied thoroughly by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Brunauer–Emmett–Teller (BET) test, and X-ray photoelectron spectroscopy (XPS) measurements. The presence of TiO2 NPs and g-C3N4 was confirmed by XRD and FTIR results. Typical SEM and TEM images revealed the apparent sheet-like nanostructure of Co-C3N4, and the filling of TiO2 NP in-layers was discovered. Meanwhile, BET results indicated the abundant pore structure of Co-C3N4 NSs/TiO2 NP composites. The ER performances of Co-C3N4 NSs/TiO2 NP composites, including shear stress, shear viscosity, and ER efficiency, were examined under different electric field strengths with a high-quality electrorheometer. Interestingly, the obtained Co-C3N4 NSs/TiO2 NP composites exhibited an excellent ER property including an unexpected ER efficiency (up to 196), superior platform area, obvious dielectric loss peak, and high shear stress (more than 600 Pa at 3.0 kV/mm), showing wide application prospects as electrorheological materials.
研究领域:
材料科学
·
纳米技术
·
物理化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 20
·11851-11860
·
IF 3.119
Rongjing Wang,Yaru Li,Qianyi Sun,Kaihua Gao,Yufu Pan,Meng Li,Feitian Zhang,Ping Na
In this paper, a new photocatalyst with TiO2 nanospheres decorated on ultrathin layered thiostannate H4xK2xSn2−xS4+x (X = 0.5–0.6, HKTS) nanosheets was successfully synthesized by a facile solvothermal method combined with the hydrolysis of tetrabutyl titanate and it was denoted as HKTS/TiO2. By adjusting the content of tetrabutyl titanate, composites with different Sn/Ti molar ratios were prepared. The composites were applied for RhB degradation under visible light irradiation, and the optimum proportion of HKTS/TiO2 was obtained. The results of X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy and scanning electron microscopy confirmed that TiO2 was successfully decorated on HKTS nanosheets. The combination of TiO2 and HKTS extended the absorption wavelength of TiO2 from UV to visible light range, and the separation efficiency of photoexcited electron–hole pairs was also enhanced. The photocatalytic degradation rate of RhB over HKTS/TiO2-1.0 was almost 97.9% after 60 min illumination, which was higher than those of HKTS and pure TiO2. The photocatalyst exhibited excellent reusability and stability as the degradation rate of RhB was 95.7% even after three cycles. The photocatalytic mechanism experiment indicated that ·O2− and h+ played a dominant role in the photocatalytic process. All these results indicate that the newly fabricated HKTS/TiO2 composites provide a high-performance photocatalyst for waste water treatment, and the application of thiostannate can be extended to the field of photocatalytic materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RADIATION PHYSICS AND CHEMISTRY
·
2019
·
IF 1.984
Xueting Xie,Liqin Li,Shengying Ye,Quan Zhang,Xuemei Chen,Xun Huang
A nanocomposite photocatalyst of TiO 2 nanotubes/reduced graphene oxide (rGO-TNTAs) were prepared by γ-ray radiolysis . The rGO-TNTAs were studied for photocatalytic decomposition of ethylene (C 2 H 4 ) in a refrigerated environment. Degradation efficiency of ethylene by these materials was described by the apparent first-order rate constant ( K ). The composite was characterized by Raman spectroscopy (RS), X-ray photoelectron spectroscopy (XPS), Atomic force microscopy (AFM) and Field emission electron microscopy (FESEM). The preparing parameters for materials affecting the degradation efficiency in terms of the rate constant were studied, including the GO addition and the irradiation dose. The results showed that (1) gamma irradiation can induce GO to partial rGO, the rGO surface of rGO-TNTAs was smooth and loosely lamellar structure. (2) The K of the rGO-TNTAs is highly dependent on the GO addition and the irradiation dose. With a GO addition of 0.1 g and an irradiation dose of 20 kGy, the maximum K value of rGO-TNTAs could be obtained under the experimental conditions. (3) From analysis of the Raman spectroscopy spectrum, optimum changes had occurred in the intensity ratio of D-band to G-band of the GO that had been γ-ray-irradiated with a dose of 20 kGy, resulting in the K of rGO-TNTAs increased by 40.9% compared with that of TNTAs.
研究领域:
材料科学
·
环境科学
·
辐射技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Shanhu Liu,Yinxi Xu,Debabrata Chanda,Lei Tan,Ruimin Xing,Xiying Li,Liqun Mao,Nakata Kazuya,Akira Fujishima
Highly efficient and durable non-noble metal-based hydrogen evolution electrocatalysts are critical to advance the production of hydrogen energy via alkaline water electrolysis . Herein, we prepared a novel TiO 2 @WS 2 hybrid via a facile and scalable two-step hydrothermal strategy combined with selective etching. Benefited from acid-etched TiO 2 nanobelts with rough surface as substrate, ultrathin WS 2 nanosheets nucleated and vertically grew into few layers in the confined configuration with more exposed active edges. Furthermore, the partial incorporation of oxygen in WS 2 inherited from the remaining O–W bonds of tungsten precursor enhanced the electrical conductivity of the hybrid. Therefore, TiO 2 @WS 2 hybrid was proved to be efficient and durable electrocatalyst for hydrogen evolution in alkaline medium . Upon optimal conditions, the hybrid only required a small onset overpotential of 95 mV and a low overpotential of 142 mV at 10 mA cm −2 , superior to pristine WS 2 and TiO 2 . In addition, better cycling stability during the alkaline HER process was also obtained, indicating its capability in future practical application. The synthesis strategy presents a cost-effective approach to produce efficient WS 2 -based HER electrocatalyst for electrochemical water splitting.
研究领域:
材料科学
·
能源化学
✓ 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）