A visible-light-controlled platform for prolonged drug release based on Ag-doped TiO2 nanotubes with a hydrophobic layer

In this work, a visible-light-controlled drug release platform was constructed for localized and prolonged drug release based on two-layer titania nanotubes (TNTs) fabricated using by an in situ voltage up-anodization process. The visible-light photocatalytic activity is improved by loading Ag onto the TNTs by NaBH4 reduction. Then, the TNTs containing Ag nanoparticles were modified with dodecanethiol (NDM) to create a hydrophobic layer. To demonstrate the visible-light-controlled drug release, the Zn2+ release behavior of the samples was investigated. In the initial 12 h, TNTs without NDM displayed a faster release rate with 29.4% Zn2+ release, which was more than three times that of the TNTs with NDM (8.7% Zn2+ release). Upon visible-light illumination, drug release from the sample coated with NDM was shown to increase due to the photocatalytic decomposition of NDM. The amount of released Zn2+ for this sample increased up to 71.9% within 12 h, indicating visible-light-controlled drug release. This drug release system may exhibit promising application as a localized, prolonged drug delivery platform.

Download Full-text

Ultra-stable CdS incorporated Ti-MCM-48 mesoporous materials for efficient photocatalytic decomposition of water under visible light illumination

Chemical Communications ◽

10.1039/c3cc41362d ◽

2013 ◽

Vol 49 (31) ◽

pp. 3221 ◽

Cited By ~ 53

Author(s):

Rui Peng ◽

Chia-Ming Wu ◽

Jonas Baltrusaitis ◽

Nada M. Dimitrijevic ◽

Tijana Rajh ◽

...

Keyword(s):

Visible Light ◽

Mesoporous Materials ◽

Photocatalytic Decomposition ◽

Light Illumination ◽

Visible Light Illumination ◽

Decomposition Of Water

Download Full-text

Enhanced Ciprofloxacin Degradation Over Pt@BaZrO3/g-C3N4 Heterojunctions Beneath Visible Light Illumination

Nanoscience and Nanotechnology Letters ◽

10.1166/nnl.2020.3190 ◽

2020 ◽

Vol 12 (7) ◽

pp. 874-884

Author(s):

Maha Alhaddad

Keyword(s):

Visible Light ◽

Charge Separation ◽

Photocatalytic Performance ◽

Charge Carriers ◽

Superior Performance ◽

Photocatalytic Decomposition ◽

Light Illumination ◽

Great Ability ◽

Visible Light Illumination ◽

Essential Parameter

In this investigation, various proportions of Pt@BaZrO3 (at 1∼4 wt.%) accommodating 2.0 wt% Pt were adopted to establish Pt@BaZrO3/g-C3N4 nanocomposites of improved photocatalytic performance. H2PtCl6 nanoparticles as well as mesoporous BaZrO3 and g-C3N4 were utilized to develop the prescribed nanocomposites via sonication-mixture routine. The photocatalytic achievement for the upgraded Pt@BaZrO3/g-C3N4 nanocomposites beneath visible light irradiation were tested by examining ciprofloxacin (CIP) degradation. Enhanced charge transfer and retarded charges’ recombination were established amid Pt, BaZrO3 NPs and g-C3N4 nanosheets in the developed heterojunctions. The proportion (wt.%) of Pt@BaZrO3 was found to be an essential parameter in governing the photocatalytic efficacy of the promoted Pt@BaZrO3/g-C3N4 nanocomposites. Moreover, complete photocatalytic decomposition of CIP was established over Pt@BaZrO3/g-C3N4 nanocomposite, accommodating 3 wt.% Pt@BaZrO3 NPs. Such superior performance was correlated to the great ability of the Pt@BaZrO3/g-C3N4 to absorb visible light in addition to the prolonged charge separation amid the photo-induced charge carriers.

Download Full-text

Photoelectrocatalytic Oxidation of Organics Under Visible Light Illumination: A Short Review

Current Organic Chemistry ◽

10.2174/1385272819666150115000247 ◽

2015 ◽

Vol 19 (6) ◽

pp. 512-520 ◽

Cited By ~ 6

Author(s):

Nikolaos Karanasios ◽

Jenia Georgieva ◽

Eugenia Valova ◽

Stephan Armyanov ◽

Georgios Litsardakis ◽

...

Keyword(s):

Visible Light ◽

Short Review ◽

Light Illumination ◽

Photoelectrocatalytic Oxidation ◽

Visible Light Illumination ◽

Oxidation Of Organics

Download Full-text

Enhanced Visible-Light Photocatalytic Performance of SAPO-5-Based g-C3N4 Composite for Rhodamine B (RhB) Degradation

Materials ◽

10.3390/ma12233948 ◽

2019 ◽

Vol 12 (23) ◽

pp. 3948

Author(s):

Lingfang Qiu ◽

Zhiwei Zhou ◽

Mengfan Ma ◽

Ping Li ◽

Jinyong Lu ◽

...

Keyword(s):

Photocatalytic Activity ◽

Visible Light ◽

Redox Reactions ◽

Photocatalytic Performance ◽

Dye Degradation ◽

Thermal Polymerization ◽

Light Illumination ◽

Electron Hole ◽

Visible Light Illumination ◽

Visible Light Photocatalytic

Novel visible-light responded aluminosilicophosphate-5 (SAPO-5)/g-C3N4 composite has been easily constructed by thermal polymerization for the mixture of SAPO-5, NH4Cl, and dicyandiamide. The photocatalytic activity of SAPO-5/g-C3N4 is evaluated by degrading RhB (30 mg/L) under visible light illumination (λ > 420 nm). The effects of SAPO-5 incorporation proportion and initial RhB concentration on the photocatalytic performance have been discussed in detail. The optimized SAPO-5/g-C3N4 composite shows promising degradation efficiency which is 40.6% higher than that of pure g-C3N4. The degradation rate improves from 0.007 min−1 to 0.022 min−1, which is a comparable photocatalytic performance compared with other g-C3N4-based heterojunctions for dye degradation. The migration of photo-induced electrons from g-C3N4 to the Al site of SAPO-5 should promote the photo-induced electron-hole pairs separation rate of g-C3N4 efficiently. Furthermore, the redox reactions for RhB degradation occur on the photo-induced holes in the g-C3N4 and Al sites in SAPO-5, respectively. This achievement not only improves the photocatalytic activity of g-C3N4 efficiently, but also broadens the application of SAPOs in the photocatalytic field.

Download Full-text

Photo-Responsive Supramolecular Micelles for Controlled Drug Release and Improved Chemotherapy

International Journal of Molecular Sciences ◽

10.3390/ijms22010154 ◽

2020 ◽

Vol 22 (1) ◽

pp. 154

Author(s):

Fasih Bintang Ilhami ◽

Kai-Chen Peng ◽

Yi-Shiuan Chang ◽

Yihalem Abebe Alemayehu ◽

Hsieh-Chih Tsai ◽

...

Keyword(s):

Reactive Oxygen Species ◽

Drug Release ◽

Visible Light ◽

Cancer Cells ◽

Laser Irradiation ◽

Reactive Oxygen ◽

Controlled Drug Release ◽

Grand Challenge ◽

Supramolecular System ◽

Oxygen Species

Development of stimuli-responsive supramolecular micelles that enable high levels of well-controlled drug release in cancer cells remains a grand challenge. Here, we encapsulated the antitumor drug doxorubicin (DOX) and pro-photosensitizer 5-aminolevulinic acid (5-ALA) within adenine-functionalized supramolecular micelles (A-PPG), in order to achieve effective drug delivery combined with photo-chemotherapy. The resulting DOX/5-ALA-loaded micelles exhibited excellent light and pH-responsive behavior in aqueous solution and high drug-entrapment stability in serum-rich media. A short duration (1–2 min) of laser irradiation with visible light induced the dissociation of the DOX/5-ALA complexes within the micelles, which disrupted micellular stability and resulted in rapid, immediate release of the physically entrapped drug from the micelles. In addition, in vitro assays of cellular reactive oxygen species generation and cellular internalization confirmed the drug-loaded micelles exhibited significantly enhanced cellular uptake after visible light irradiation, and that the light-triggered disassembly of micellar structures rapidly increased the production of reactive oxygen species within the cells. Importantly, flow cytometric analysis demonstrated that laser irradiation of cancer cells incubated with DOX/5-ALA-loaded A-PPG micelles effectively induced apoptotic cell death via endocytosis. Thus, this newly developed supramolecular system may offer a potential route towards improving the efficacy of synergistic chemotherapeutic approaches for cancer.

Download Full-text

Hybrid ZnO/MoS2 Core/Sheath Heterostructures for Photoelectrochemical Water Splitting

Applied Nano ◽

10.3390/applnano2030012 ◽

2021 ◽

Vol 2 (3) ◽

pp. 148-161

Author(s):

Katerina Govatsi ◽

Aspasia Antonelou ◽

Labrini Sygellou ◽

Stylianos G. Neophytides ◽

Spyros N. Yannopoulos

Keyword(s):

Visible Light ◽

Wide Band ◽

Nanowire Arrays ◽

Maximum Efficiency ◽

Light Illumination ◽

Wide Band Gap ◽

Long Term Stability ◽

Visible Light Illumination ◽

Nanowire Surface ◽

Wide Range

The rational synthesis of semiconducting materials with enhanced photoelectrocatalytic efficiency under visible light illumination is a long-standing issue. ZnO has been systematically explored in this field, as it offers the feasibility to grow a wide range of nanocrystal morphology; however, its wide band gap precludes visible light absorption. We report on a novel method for the controlled growth of semiconductor heterostructures and, in particular, core/sheath ZnO/MoS2 nanowire arrays and the evaluation of their photoelectrochemical efficiency in oxygen evolution reaction. ZnO nanowire arrays, with a narrow distribution of nanowire diameters, were grown on FTO substrates by chemical bath deposition. Layers of Mo metal at various thicknesses were sputtered on the nanowire surface, and the Mo layers were sulfurized at low temperature, providing in a controlled way few layers of MoS2, in the range from one to three monolayers. The heterostructures were characterized by electron microscopy (SEM, TEM) and spectroscopy (XPS, Raman, PL). The photoelectrochemical properties of the heterostructures were found to depend on the thickness of the pre-deposited Mo film, exhibiting maximum efficiency for moderate values of Mo film thickness. Long-term stability, in relation to similar heterostructures in the literature, has been observed.

Download Full-text