INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Rixiang Su,Wei Su,Jinyun Cai,Lei Cen,Shanshan Huang,Yu Wang,Peiyuan Li
Although photodynamic therapy (PDT) has great advantages for the treatment of bacterial infections, photosensitizers (PSs) often have many disadvantages that limit their application. Improving the shortcomings of PSs and developing efficient PDT antimicrobial materials remain serious challenges. In this study, a nanocomposite drug (TiO 2 /curcumin/hydroxypropyl-cyclodextrin, TiO 2 /Cur/HPCD) was constructed and combined with konjac glucomannan to form composite films (TiO 2 /Cur/HPCD films, KTCHD films). The stabilities of TiO 2 and Cur were improved in the presence of HPCD. The particle size of TiO 2 /Cur/HPCD was approximately 33.9 nm, and the addition of TiO 2 /Cur/HPCD enhanced the mechanical properties of the films. Furthermore, TiO 2 /Cur/HPCD and KTCHD films exhibited good biocompatibility and PDT antibacterial effects. The antibacterial rate of TiO 2 /Cur/HPCD was 74.46 % against MRSA at 500 μg/mL and 99.998 % against E. coli at 400 μg/mL, while it was adsorbed on the surface of bacteria to improve the effectiveness of the treatment. In addition, studies in mice confirmed that TiO 2 /Cur/HPCD and KTCHD films can treat bacterial infections and promote wound healing, with a highest wound healing rate of 84.6 % in the KTCHD-10 films + Light group on day 12. Overall, TiO 2 /Cur/HPCD is a promising nano-antibacterial agent and KTCHD films have the potential to be employed as antibacterial and environment-friendly trauma dressings.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Cong Fu,Lingfang Liu,Xuelin Fan,Guofeng Zhao
Tracking the concentrations of surface-reaching photoexcited charges in photocatalysis is of great importance to fundamental science. Herein, through combining in situ and time-resolved diffuse-reflectance infrared spectroscopy (DRIFTS), we report an adsorbed methanol species surface elementary reaction kinetic analysis method. This strategy allows us to track the concentration of surface-reaching photoholes in well-defined anatase TiO2 nanoparticles, and compare it with that of rutile TiO2 nanoparticles. The photocatalytic oxidation of adsorbed methanol species on different TiO2 crystal phase surface follows first-order reaction kinetics. Thus, the corresponding rate constants of adsorbed methanol species have been acquired, which could directly mirror the concentration of surface-reaching photoholes under light irradiation. Based on the specific value of the reaction rate constant of adsorbed methanol species on different TiO2 crystal phase surface, for the first time, it can be concluded that concentration of surface-reaching photoholes in anatase is nearly 3.3 times greater than that of rutile under light irradiation. These results newly illustrate why anatase usually exhibits higher photocatalytic activity than rutile. Meanwhile, this work highlights that probing molecules in a surface elementary reaction kinetic analysis based on in situ and time-resolved DRIFTS could be utilized as an effective method to track the concentration of surface-reaching photoexcited charges in photocatalysis as well as other similar kinds of catalytic processes.
✓ 已验证
产品关联
DOI
高影响因子
Progress in Natural Science-Materials International
·
2023
·
IF 4.7
Lin Zhang,Jun Chen,Lai-Bo Song,Jun-Jie Pan,Qing Luo
Developing effective and stable photocatalysts for organic pollutants degradation are still a big challenge in practical water treatment now. In this work, La doped ZnO–TiO 2 composite (La/ZnO–TiO 2 ) were successfully fabricated by using PVP modified ZIF-8/TiO 2 as template via the absorption and pyrolysis routes. All as-fabricated materials were analyzed by XRD , SEM, TEM , BET, XPS , UV–vis absorption spectra and ESR spectra. PVP modified ZIF-8/TiO 2 was fully transferred into ZnO–TiO 2 after being pyrolyzed at high temperature under air atmosphere. The doping of La can make ZnO–TiO 2 exhibiting red-shifted, which is attributed to the capture of photo-generated electrons by La, leading to the effective separation between photo-generated electrons and holes. Furthermore, the photocatalytic performance of all as-fabricated materials were explored by degradation of tetracycline (TC) solution under UV light irradiation. La/ZnO–TiO 2 exhibits excellent stability. And the photocatalytic degradation rate of La/ZnO–TiO 2 is 99.2%, which is even higher than ZnO (87.4%), ZnO–TiO 2 (87.4%), P25 (TiO 2 ) (92.7%). More than that, the effect of catalyst's dose, effect of TC concentration and effect of pH for TC degradation have been well explored. The excellent photocatalytic performance of La/ZnO–TiO 2 makes it possible to be applied for degradation of organic pollutants in practice.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2023
·
IF 4.3
Hongyun Xue,Gansheng Shi,Guanhong Lu,Xinhong Xu,Xiaomeng Ren,Yan Wang,Xiao Wang,Xiaofeng Xie,Jing Sun
Constructing heterojunction structures is considered one of the effective methods to improve the activity of photocatalysts. A novel Z-Scheme heterojunction Fe-BDC/TiO 2 was designed and synthesized by amorphous gel Fe-BDC and TiO 2 nanoparticles with electrostatic self-assembly method. The introduction of Fe-BDC has been proved to expand the light absorption range and promote the separation and transfer of interface photo generated electrons and holes. Thus, the photocatalytic degradation efficiency of acetaldehyde by 5% Fe-BDC/TiO 2 sample is 2.3 times than that of pure TiO 2 sample. And the reaction rate is 2.5 times than that of pure TiO 2 sample. The free radical capture experiment shows that O 2 − played a more important role in the degradation of acetaldehyde. In addition, in situ infrared analysis further reveals the surface species of the photocatalysts during adsorption and degradation processes. The acetaldehyde degradation route of Fe-BDC/TiO 2 has been speculated. ‘1These findings provide valuable references for the design of metal oxide semiconductor/Fe based MOF heterojunctions and the efficient degradation of aldehyde VOCs.
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2023
·
IF 8.4
Pu Zhang,Haihua Zeng,Decai Wen,Xiaoyu Sui,Zhuan Wang,Ying Wang,Hailong Chen,Yuxiang Weng,Jinlin Long
Graphical With the combination of surface organometallic chemistry and post-synthetic ligand exchange or calcination, the coordination environments of Ni sites were precisely manipulated to achieve a splendid improvement in hydrogen evolution reaction (HER) under visible-light irradiation. Thereinto, the 2,2′-bipyridine bonded Ni catalyst showed the optimum HER ability, 260 folds as Ni without ligand and 2.5 folds as 2-phenylpyridine bonded Ni catalyst. Solar hydrogen production at a high efficiency holds the significant importance in the age of energy crisis, while the micro-environment manipulation of active sites on photocatalysts plays a profound role in enhancing the catalytic performance. In this work, a series of well-defined single-site Ni-grafted TiO 2 photocatalysts with unique and specific coordination environments, 2,2′-bipyridine-Ni−O−TiO 2 (T−Ni Bpy) and 2-Phenylpyridine-Ni−O−TiO 2 (T−Ni Phpy), were constructed with the methods of surface organometallic chemistry combined with surface ligand exchange for visible-light-induced photocatalytic hydrogen evolution reaction (HER). A prominent rate of 33.82 μmol ⋅ g −1 ⋅ h −1 and a turnover frequency of 0.451 h −1 for Ni are achieved over the optimal catalyst T−Ni Bpy for HER, 260-fold higher than those of Ni−O−TiO 2 . Fewer electrons trapped oxygen vacancies and a larger portion of long-lived photogenerated electrons (>3 ns, ~52.9 %), which were demonstrated by the electron paramagnetic resonance and femtosecond transient IR absorption, correspond to the photocatalytic HER activity over the T−Ni Bpy. The number of long-lived free electrons injected from the Ni photoabsorber to the conduction band of TiO 2 is one of the determining factors for achieving the excellent HER activity.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Yi Jiang,Yile Dai,Xianfei Xie,Qing Wang,Jianfeng Dai
In this work, we propose a strategy that is different from the traditional technology of increasing the specific area of the TiO2 film to improve the carrying capacity of QDs in QDSSCs. Transparent anatase TiO2 films are prepared by improving the optical transmittance of the photoanode TiO2 film so that the attached QDs can capture more photons and improve the efficiency of utilizing QDs. This QDSSC preparation technology sacrifices part of QDs loading but improves the utilization efficiency of QDs. At the same time, the transparent bulk TiO2 film decreases the transmission distance of photogenerated charge carriers, reduces the cross-interface transport, optimizes the transmission path, and reduces the carrier capture composite rate compared with the TiO2 particle film. Therefore, it not only increases the Voc, FF, and PCE of QDSSCs to 0.628 V, 54.7, and 6.166%, respectively, but also has greater transparency. It meets the demand for solar cell transparency in practical applications and has a wider range of applications and better aesthetics. The mechanism simulation and theoretical analysis of photothermal conversion and electromagnetic mechanism show that the barrier of carrier transfer in bulk transparent anatase TiO2 is lower than the physical barrier between anatase TiO2 NPs. The advantages of the anatase transparent TiO2 film in the process of photogenerated charge carrier transmission are verified. It provides an idea for the development of QDSSCs. It also brings the technology of transparent TiO2 film to related fields.
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Peng Li,Senlin Zhang,Zhourong Xiao,Hui Zhang,Fei Ye,Jianmin Gu,Jidong Wang,Guozhu Li,Desong Wang
Catalytic reduction of CO 2 to high value-added chemicals such as methane is crucial in the development of renewable energy and waste disposal. Photo-thermal CO 2 methanation has been received great attention, because the synergistic effect of photo and thermal lead to efficient CO 2 reduction at low temperature. Herein, we reported the synthesis of Ni nanoparticles (NPs) supported on TiO 2 (Ni-TiO 2 ) derived from MIL-125 (Ti-MOFs) for photo-thermal CO 2 methanation. The nanoparticle sizes and electron densities of metallic Ni, defects and chemical properties, photo-thermal and photo-electric characteristics of the catalysts have been systematically characterized by XRD, TEM, CO 2 /H 2 -TPD, XPS, photoluminescence and photocurrent. For the Ni-TiO 2 , the conversion of CO 2 was 56 % under the full spectrum irradiation (1200 mW/cm 2 ) at 325 °C, which was about 1.8 times of that without light irradiation. The selectivity of methane nearly 99 % with a production rate was 95.7 mmol/(g cat ∙h), which was about 2.7 times of that without light irradiation. Meanwhile, the catalysts showed excellent stability without any activity decay during the four cycles testing (32 h). The main reasons for the high catalytic performance for photo-thermal CO 2 methanation were attributed to the uniform distribution of Ni NPs with synergistic effect of large specific surface area of TiO 2 with abundant moderate strength alkaline sites. In addition, good photo-thermal and photo-electric conversion ability make the catalysts possess more photo-generated charge carriers and reduce its recombination.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Chuang-Tian Zhan,Jin-Yuan Wu,Kun-Heng Huang,Yun Li,Li-Xiang Wu,Sheng-Jin He,Yang-Qing Liu,Ze-Xi Zhang,Wei-Ming Guo,Jia-Xiang Xue,Hua-Tay Lin
The pressureless-sintered silicon carbide ceramic with and without surface texturing was joined with CaO-Al 2 O 3 -MgO-TiO 2 -SiO 2 glass filler. The experimental results showed that without texturing applied to SiC substrates, the shear strength of SiC joints was 40.8 ± 6.3 MPa, with failure occurring at the interlayer. Unfilled regions in the interlayer limited the shear strength of the joints. When texturing was applied to SiC substrates, SiO 2 layer was formed on the surface of substrates due to high-temperature oxidation, which subsequently promoted the wettability of filler on substrates. The textured grooves on SiC substrates could be filled with glass material during joining process. The shear strength of textured SiC joints was 69.3 ± 9.9 MPa with a mixed-mode failure when the direction of shear load was perpendicular to the texturing direction. The better wettability, larger joining area, and interlocking structure between the glass filler and substrates enhanced the shear strength of textured joints.
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 37
·e202300997
·
IF 2.1
Yingying Li,Jiafei Wang,Xiang Wan,Qishu Qu
Graphical SiO 2 /graphene spheres with intercalated structure and dendritic pores were prepared as supports by a one-step hydrothermal method, and then TiO 2 was coated on them to obtain SiO 2 /graphene@TiO 2 composites (SGT). After 90 min of visible light irradiation, the degradation rate of RhB by SGT catalyst was 68.9 %, which was significantly higher than that of P25 by 39.3 %. The use of TiO 2 /graphene composites as catalysts for photodegradation of dyes has been widely investigated. TiO 2 /graphene composites are usually obtained by coating TiO 2 on the surface of pre-prepared graphene. However, graphene is prone to curling and stacking, which makes it difficult to uniformly coat TiO 2 on its surface, resulting in poor photocatalytic performance. In this paper, a non-conventional approach to prepare TiO 2 /graphene nanocomposites based on the use of porous SiO 2 /graphene spheres as supports is presented. SiO 2 /graphene spheres with intercalated structure and dendritic pores were prepared as supports by a one-step hydrothermal method. Then, TiO 2 was coated into the pores of SiO 2 /graphene spheres by sol-gel method to obtain SiO 2 /graphene@TiO 2 composites (SGT). After 90 min of visible light irradiation, the degradation rate of RhB by SGT catalyst was 68.9 %, which was significantly higher than that of P25 by 39.3 %. A mechanism of the RhB removal by the SGT composites was proposed.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Yan Chen,Meixia Wu,Jiang Li,Qiang Zhao,Sanbing Zhang,Yong Guo,Feng Feng,Zuopeng Li
Hydrogen, as a clean and pollution-free energy with high calorific value , is one of the best alternatives to fossil fuels. Hydrogen evolution reaction (HER), as a half reaction of electrochemical water splitting, has also received extensive attention. At present, the development of low-cost and high-performance hydrogen evolution catalysts still faces enormous challenges. In this work, we synthesized a series of RuNi/TiO 2 -oxMWCNT catalysts with different Ru and Ni ratio. After optimizing the composition and proportion, RuNi/TiO 2 -oxMWCNT with Ru:Ni=4:6 has the optimal hydrogen evolution performance. High HER performance of extremely low 14.8 mV overpotential at 10 mA·cm −2 and 38.4 mV·dec −1 Tafel slope with perfect stability is achieved, which is superior to most reported ruthenium-based catalysts and even commercial Pt/C. XPS and UPS indicates that there is a metal synergistic effect of Ru and Ni and a strong SMSI between Ru and TiO 2 in the RuNi/TiO 2 -oxMWCNT catalyst, which helps to improve hydrogen evolution performance. This study provides a pathway for the rational design of multi-component nanostructured catalysts for HER.
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 29
·期 1
·144
·
IF 4.6
Tao Tian,Jie Zhang,Lijiang Tian,Sijie Ge,Zhenyu Zhai
Visible-light-enhanced TiO2nanocatalysts doped with Cu and Fe were synthesized using the sol–gel method to investigate their performance in degrading gaseous benzene. The structure and morphology of mono- and co-doped TiO2(i.e., Cu/Fe-TiO2, Cu-Fe-TiO2) were characterized using SEM, EDS, XRD, BET, Raman, UV-vis-DRS, and XPS techniques. The results indicated that the presence of Cu/Fe mono- and co-doped TiO2leads to the formation of an anatase phase similar to pure TiO2. Furthermore, the introduction of Cu/Fe enhanced the presence of lattice defects and increased the specific surface area of TiO2. This enhancement can be attributed to the increase in oxygen vacancies, especially in the case of Cu-Fe-TiO2. Additionally, Cu-Fe-TiO2showed a higher concentration of surface-bound hydroxyl groups/chemically adsorbed oxygen and a narrower bandgap than pure TiO2. Consequently, Cu-Fe-TiO2exhibited the highest photocatalytic performance of 658.33 μgC6H6/(g·h), achieving a benzene degradation rate of 88.87%, surpassing that of pure TiO2(5.09%), Cu-TiO2(66.92%), and Fe-TiO2(59.99%). Reusability tests demonstrated that Cu-Fe-TiO2maintained a high benzene degradation efficiency of 71.4%, even after five experimental cycles, highlighting its exceptional stability and reusability. In summary, the addition of Cu/Fe to TiO2enhances its ability to degrade gaseous benzene by prolonging the catalyst’s lifespan and expanding its photoresponse range to include visible light.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xinwei Geng,Yongfeng Xia,Hanqin Liang,Dongxu Yao,Yu-Ping Zeng
Magnéli phases are an important class of transition metal oxides widely utilized in fields such as batteries, electrocatalysis , and photocatalysis . However, there are no reports on the use of Magnéli phases as additives in ceramic sintering. In order to explore the impact of the Magnéli phase as an additive on the sintering process, self-made Magnéli phase Ti 4 O 7 powder was added to the graded mixture of titanium dioxide (TiO 2 ) coarse powder and nanopowder , and sintered under atmospheric conditions in this study. The sintering characteristics, microstructure, and mechanical properties of TiO 2 ceramics with different content of Ti 4 O 7 were characterized. The results revealed that the addition of Ti 4 O 7 contributed to the reduction of the densification temperature of TiO 2 ceramics. Compared to the undoped sample, the addition of 1 wt% Ti 4 O 7 powder significantly improved the flexural strength and Vickers hardness of TiO 2 ceramics by 13.5% and 24.8%. According to the results of thermal analysis, UV–Vis–NIR, and XPS, the mechanism of Ti 4 O 7 in the sintering process of TiO 2 ceramics under atmospheric conditions was systematically discussed. This work not only obtained TiO 2 ceramics with improved performance but also showed the tremendous potential of Magnéli phases in the field of ceramic sintering.
✓ 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）