Кафедра биофизики

  • Increase font size
  • Default font size
  • Decrease font size
Главная страница Новости науки Journal of Photochemistry and Photobiology A: Chemistry
Новости науки
ScienceDirect Publication: Journal of Photochemistry and Photobiology A: Chemistry
ScienceDirect RSS

ScienceDirect Publication: Journal of Photochemistry and Photobiology A: Chemistry
  • Silver nanoparticle loaded TiO2 nanotubes with high photocatalytic and antibacterial activity synthesized by photoreduction method
    Publication date: 1 February 2018
    Source:Journal of Photochemistry and Photobiology A: Chemistry, Volume 352

    Author(s): Pham Van Viet, Bach Thang Phan, Derrick Mott, Shinya Maenosono, Truong Tan Sang, Cao Minh Thi, Le Van Hieu

    Silver nanoparticles (Ag NPs) were loaded on TiO2 nanotubes (TNTs) via photoreduction method at room temperature without any additional reducing agent. The morphology and crystal structure were examined by transmission electron microscopy, X–ray diffraction pattern, and Raman spectroscopy. Chemical states of silver, titanium, and oxygen were analyzed by X–ray photoelectron spectroscopy. The results showed that Ag NPs with an average diameter of 5nm were uniformly distributed on TNTs surface. Ag NPs improved both photocatalytic and the antibacterial activity of TNTs under sunlight irradiation. Ag/TNTs decomposed 81.2% of methylene blue and 75.8% of methylene orange after 150min under sunlight irradiation. In addition, Ag/TNTs at 20ppm concentration eliminated 99.99% of Staphylococcus aureus after 60min under sunlight irradiation. This research demonstrated that Ag/TNTs can be synthesized at industrial scale by the photoreduction method and are effective antibacterial materials.







  • Metallocarbonyl complexes: (η5-C5H5)M(CO)n(η1-N-imidato) (M=Fe, Ru, Mo, W; n=2, 3) as new photoactive CO-releasing molecules (CORMs)
    Publication date: 15 January 2018
    Source:Journal of Photochemistry and Photobiology A: Chemistry, Volume 351

    Author(s): Aleksandra Kubicka, Ewa Parfieniuk, Emilia Fornal, Marcin Palusiak, Daria Lizińska, Anna Gumieniczek, Bogna Rudolf

    Water-soluble, half-sandwich metallocarbonyl complexes of different metals, i.e., Fe, Ru, W, and Mo, bearing imidato ligands were shown to be photoactive, CO releasing molecules. The (η5-C5H5)M(CO)n1-N-imidato) complexes (M=Fe, Mo, W; n=2, 3) released CO under illumination by visible light, while the (η5-C5H5)Ru(CO)21-N-maleimidato) complex was activated by UV light for CO release. Thus, the mechanism of CO loss upon illumination, was investigated by several methods, including myoglobin assay, LC/QTOF, IR and 1H NMR. Our investigations highlighted that CO release was due to the total decomposition of the complexes. The photoinduced degradation of maleimide complexes led to the Diels-Alder reaction products due to cycloaddition of cyclopentadiene (released from the complex) to the maleimidato ligand of the starting complex.

    Graphical abstract

    image






  • Facile hydrothermal synthesis of carbon dots (CDs) doped ZnFe2O4/TiO2 hybrid materials with high photocatalytic activity
    Publication date: 15 February 2018
    Source:Journal of Photochemistry and Photobiology A: Chemistry, Volume 353

    Author(s): Yida Lu, Yiping Feng, Fengliang Wang, Xuegang Zou, Zhi-Feng Chen, Ping Chen, Haijin Liu, Yuehan Su, Qianxin Zhang, Guoguang Liu

    In this study, a novel and highly efficient ternary photocatalytic ZnFe2O4/TiO2/CDs nanocomposite was successfully synthesized by a hydrothermal method. The properties and structures of the samples were characterized by X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Fourier transform infrared spectrometry (FT-IR), and photoluminescence spectrum (PL). The UV–vis diffuse reflectance spectrum was used to demonstrate that carbon quantum dots could increase the absorption of visible light wavelengths. When compared with TiO2/3.00wt%CDs and ZnFe2O4/TiO2 nanocomposites, the ternary photocatalysts exhibited the enhanced photocatalytic activity under solar-spectrum irradiation. A low CDs content of 3.00wt% in the ternary photocatalysts possessed excellent performance in the decomposition of Rhodamine B (RhB). Act as donator and receiver, CDs can efficiently improve the ability of electron transfer and separate the electron-hole pairs. OH and O2 were confirmed to be involved in the photocatalytic degradation of RhB base on the Electron spin resonance (ESR) tests, and the photocatalytic mechanism of the ZnFe2O4/TiO2/3.00wt%CDs was proposed. After four sequential operational cycles, the ZnFe2O4/TiO2/CDs maintained its photocatalytic efficiency, indicating its high photocatalytic stability. Therefore, our results provide a high efficient photocatalytic nanocomposite that synthetized by a facile method, and have implications in the removal of environmental persistent pollutants under ternary photocatalysts mediated solar degradation

    Graphical abstract

    image






  • Rhodamine – Cyclohexane diamine based “turn-on” fluorescence chemosensor for Cr3+: Photophysical & confocal cell imaging studies
    Publication date: 15 January 2018
    Source:Journal of Photochemistry and Photobiology A: Chemistry, Volume 351

    Author(s): Sunanda Sahana, Gargi Mishra, Sri Sivakumar, Parimal K. Bharadwaj

    A new rhodamine based fluorescent turn on sensor L has been reported as a highly selective and sensitive chemosensor for the Cr3+ ion in a CH3CN-H2O solution. In presence of Cr3+ ion, the strong fluorescence enhancement is attributed due to the interaction of Cr3+ with L, leading to opening of the spirolactam ring of rhodamine B to the amide form. The Cr3+ sensing mechanism is also supported by the Job’s plot, ESI-MS, 1H NMR titration experiments. Importantly, this probe shows high selectivity over other biologically relevant metal ions. Also, anions do not show any effect. In addition, the detection limit is found to be up to 7.5nM which is acceptable within the EPA (US) limit. The probe is also able to function within a broad biological pH range of 4–8. Furthermore, the probe L shows cellular penetrability for its potential use in confocal cell imaging studies.

    Graphical abstract

    image






  • A novel fluorescence sensor for dual sensing of Hg2+ and Cu2+ ions
    Publication date: 15 February 2018
    Source:Journal of Photochemistry and Photobiology A: Chemistry, Volume 353

    Author(s): Yi-Wun Sie, Chia-Lin Li, Chin-Feng Wan, Hongbin Yan, An-Tai Wu

    A novel fluorescence probe (L) was prepared and its sensing behavior toward metal ions was investigated. Probe L exhibited colorimetric response toward Hg2+ and fluorescence enhancement with an obvious blue shift toward Cu2+ in CH3CN/H2O (v/v, 9:1). The association constant for probe L-Hg2+ and probe L-Cu2+ in CH3CN/H2O (v/v, 9:1) was determined as 1.5×104 M −1 and 5.3×108 M −2, respectively. The detection limit of probe L for the analysis of Hg2+ and Cu2+ was determined as 22.69ppb and 155.53 ppb, respectively.

    Graphical abstract

    image






  • A sensitive BODIPY-based fluorescent probe suitable for hypochlorite detection in living cells
    Publication date: 1 February 2018
    Source:Journal of Photochemistry and Photobiology A: Chemistry, Volume 352

    Author(s): Yuanyuan Li, Yong Tang, Mengmeng Gao, Yun Wang, Juan Han, Jinchen Xia, Lei Wang, Xu Tang, Liang Ni

    A fluorescent probe composed of BODIPY and 2,4-dinitrophenylhydrazine was designed for the detection of ClO. The oxidizing reaction between probe and ClO resulted in a distinct fluorescence enhancement together with a color variation from pink to orange. This probe showed excellent selectivity to ClO among various ions including common reactive oxygen species and high sensitivity with a detection limit of 228nM. A fast response (7min) was observed, which made the probe a promising method in real-time detection. Furthermore, this probe was successfully applied to monitor ClO in real-life water and living cells.

    Graphical abstract

    image






  • Antituberculosis drugs degradation by UV-based advanced oxidation processes
    Publication date: 15 February 2018
    Source:Journal of Photochemistry and Photobiology A: Chemistry, Volume 353

    Author(s): Sandra Stets, Bianca do Amaral, Jéssica Tamara Schneider, Ivan Ricardo de Barros, Marcus Vinícius de Liz, Ronny Rocha Ribeiro, Noemi Nagata, Patricio Peralta-Zamora

    Several advanced oxidation processes (AOPs) were investigated for the degradation of isoniazid (INH) and rifampicin (RIF) in aqueous solution: TiO2 and ZnO heterogeneous photocatalysis and homogeneous and heterogeneous UV-A photo-Fenton processes. Under optimized conditions (pH 6.0 and 500mgL−1 of photocatalyst) the UV-A TiO2-photocatalysis removed approximately 90% of INH and 60% of RIF at 60min. Under similar experimental conditions, the degradation efficiency of ZnO was significantly lower to INH. The low-cost UV-A homogeneous photo-Fenton process removed 70% of INH and 80% of RIF at 60min. Photo-Fenton process using iron-immobilized in chitosan beads showed lower degradation efficiency (7% to INH and 50% to RIF) probably due to low iron availability in the catalyst surface. A radical scavenging assay was performed to investigate the effect of free radicals (hydroxyl radical (OH), electron vacancy (hole, h+), superoxide radical anions (O2 ), and singlet oxygen (1O2)) on INH and RIF degradation during TiO2/UV-A photocatalysis. The two drugs have distinct degradation mechanisms, while RIF is degraded by h+, INH suffers influence of various active species. The TiO2/UV-A photocatalysis was employed to degrade INH/RIF residue.

    Graphical abstract

    image






  • A novel colorimetric and fluorescent probe for trivalent cations based on rhodamine B derivative
    Publication date: 15 January 2018
    Source:Journal of Photochemistry and Photobiology A: Chemistry, Volume 351

    Author(s): Xiao-li Yue, Chao-rui Li, Zheng-yin Yang

    A novel Schiff-base (HL) based on rhodamine B derivative was designed and synthesized as a highly selective and sensitive “turn-on” fluorescent probe for M3+ (Cr3+, Fe3+, and Al3+) in methanol. Upon addition of M3+, the spirolactam ring (colorless and nonfluorescent) of HL was opened to the ring-open forms (pink and orange-yellow fluorescence). These results indicated that HL could be used as a colorimetric and fluorescent probe for the detection of M3+ with low detection limit of 0.63μM (Cr3+), 0.14μM (Fe3+), and 0.22μM (Al3+). The binding constant (Ka) of M3+ binding to HL were calculated to be 0.87×104 M−1 (Cr3+), 1.14×104 M−1 (Fe3+), and 4.48×104 M−1 (Al3+), respectively from a Benesi-Hildebrand plot. The binding stoichiometry between HL and M3+ was determined from the Job’s plot (fluorescent spectrum) and ESI–MS spectrum data to be 1:1. Furthermore, the recognition process of the probe for M3+ was chemically reversible on the addition of fluorinion (F).

    Graphical abstract

    image






  • Hydrogen-bonded self-assembly, spectral properties and structure of supramolecular complexes of thiamonomethine cyanines with cucurbit[5,7]urils
    Publication date: 15 February 2018
    Source:Journal of Photochemistry and Photobiology A: Chemistry, Volume 353

    Author(s): Marina V. Fomina, Alexander S. Nikiforov, Vitaly G. Avakyan, Artem I. Vedernikov, Nikolai A. Kurchavov, Lyudmila G. Kuz’mina, Yuri A. Strelenko, Judith A.K. Howard, Sergey P. Gromov

    The complex formation of thiamonomethine cyanine dyes bearing two N-ammoniohexyl or two N-ethyl substituents with cucurbit[5,7]urils (CB[5,7]) in aqueous solutions was studied by electronic and 1H NMR spectroscopy, including spectrophotometric, fluorescence, and 1H NMR titration methods. It was found that CB[5] forms external complexes with the dyes, while CB[7] forms internal (inclusion) complexes of 1:1 and 1(dye):2(CB[5,7]) composition. The complexation with CB[5,7] changes the absorption spectra of cyanine dyes and induces a considerable fluorescence enhancement. The stability constants of the complexes were determined (logK 1:1 varies in the range from 3.53 to more than 6, and logK 1:2 varies in the range from 3.5 to 4.32). The dye with ammoniohexyl substituents forms more stable complexes owing to hydrogen bond formation between the NH3 + groups and the carbonyl groups of the CB[5,7] portals. The structure of supramolecular complexes was confirmed by quantum chemical calculations.

    Graphical abstract

    image






  • Cu2O clusters decorated on flower-like TiO2 nanorod array film for enhanced hydrogen production under solar light irradiation
    Publication date: 15 January 2018
    Source:Journal of Photochemistry and Photobiology A: Chemistry, Volume 351

    Author(s): Ling Le, Yiting Wu, Zhongpo Zhou, Haiying Wang, Rui Xiong, Jing Shi

    In this work, the TiO2 nanorod arrays (TNAs), TNAs/Cu2O-10CYC, and TNAs/Cu2O-30CYC composites photo-catalysts for solar water splitting anode was successfully prepared via cyclic impregnation growth method. The structure, surface morphology and element chemical states have been investigated and discussed in detail. The UV–vis and PL results confirm that interaction has been formed between TNAs and Cu2O in the composite photo-catalysts and the TNAs/Cu2O composites exhibit broad spectrum absorption. Three factors affecting on the enhancement of solar light hydrogen production efficiency, e.g. enhanced UV-light absorption in solar spectrum, massive charge carrier generation and improved surface-interface reaction due to the absorbing visible light by the narrow band gap Cu2O and the injecting electrons into TiO2 conduction band, are proposed based on the experimental results. The TNAs/Cu2O-10CYC composite samples exhibit highest enhanced photocatalytic activities in the hydrogen production, which H2 evolution efficiency is about 4-fold higher than that of pure TNAs. It indicates that the efficient photo generated electron-hole transformation and separation in TNAs/Cu2O-10CYC composite sample leads to the improvement of photocatalytic performance. The present study provides a new light to prepare TNAs/Cu2O of novel configuration with promising potential applications.

    Graphical abstract

    image






Научная работа