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

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.

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

Materials ◽  
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.

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

2018 ◽  
Vol 9 ◽  
pp. 1793-1801 ◽  
Author(s):  
Caihong Liang ◽  
Jiang Wen ◽  
Xiaoming Liao
Keyword(s):  
Drug Release ◽  
Visible Light ◽  
Controlled Drug Release ◽  
Photocatalytic Decomposition ◽  
Light Illumination ◽  
Visible Light Illumination ◽  
Delivery Platform ◽  
Promising Application ◽  
Hydrophobic Layer ◽  
Prolonged Drug Release

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.

SrTaO2N co-doped with La/Zr as promising photocatalysts for water reduction under visible light illumination

2020 ◽  
Vol 7 (12) ◽  
pp. 2343-2351
Author(s):  
Ran Wang ◽  
Guoan Lin ◽  
Xiaoxiang Xu
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Charge Separation ◽  
Light Illumination ◽  
Visible Light Absorption ◽  
Water Reduction ◽  
Co Doping ◽  
Visible Light Illumination ◽  
Co Doped ◽  
Separation Conditions

La/Zr co-doping preserves visible light absorption of SrTaO2N, prohibits the formation of defects, improves surface hydrophilicity and charge separation conditions, all of which contribute to an enhanced photocatalytic activity for water reduction.

Synthesis of a superparamagnetic MFNs@SiO2@Ag4SiW12O40/Ag composite photocatalyst, its superior photocatalytic performance under visible light illumination, and its easy magnetic separation

RSC Advances ◽  
2014 ◽  
Vol 4 (57) ◽  
pp. 30090-30099 ◽  
Author(s):  
Wenshu Tang ◽  
Yu Su ◽  
Xiaoxin Wang ◽  
Qi Li ◽  
Shian Gao ◽  
...  
Keyword(s):  
Visible Light ◽  
Magnetic Separation ◽  
Photocatalytic Performance ◽  
Light Illumination ◽  
Composite Photocatalyst ◽  
Highly Efficient ◽  
Visible Light Illumination ◽  
Visible Light Photocatalytic

A novel superparamagnetic Ag@silver-based salt photocatalyst was created with highly efficient visible light photocatalytic performance and easy magnetic separation.

Enhanced photocatalytic disinfection of microorganisms by transition-metal-ion-modification of nitrogen-doped titanium oxide

2010 ◽  
Vol 25 (1) ◽  
pp. 167-176 ◽  
Author(s):  
Qi Li ◽  
Pinggui Wu ◽  
Rongcai Xie ◽  
Jian Ku Shang
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Metal Ion ◽  
Photocatalytic Performance ◽  
Light Illumination ◽  
Transition Metal Ion ◽  
Nitrogen Doped ◽  
Carrier Recombination ◽  
Visible Light Illumination ◽  
Charge Carrier Recombination

In this article, palladium modification and silver modification were used as examples to demonstrate the disinfection effects on microorganisms in aqueous environment of photocatalytic transition-metal-ion-modified nitrogen-doped titanium oxide (TiON/M) materials. Transition metal ion modification was applied to TiON to take advantage of the coupling between transition metal ion addition and TiON semiconductor matrix under visible light illumination. The coupling promotes the separation of electron and hole pairs produced by photon excitation, thus it could reduce the intrinsic charge carrier recombination from anion-doping, which largely limits the photoactivity of TiON under visible light illumination. Large enhancements on the hydroxyl radical production and the photocatalytic disinfection efficiency on microorganisms under visible light illumination were observed for TiON with both palladium and silver modifications. The superior photocatalytic performance under visible light illumination suggests that the transition metal ion modification is an effective approach to reduce the massive charge carrier recombination from anion-doping and to enhance the photocatalytic performance of anion-doped TiO2. The resulting photocatalytic materials have the potential for a wide range of environmental applications.

Au nanoparticles-doped g-C3N4 nanocomposites for enhanced photocatalytic performance under visible light illumination

2020 ◽  
Vol 46 (14) ◽  
pp. 22090-22101 ◽  
Author(s):  
M. Faisal ◽  
Mohammed Jalalah ◽  
Farid A. Harraz ◽  
Ahmed Mohamed El-Toni ◽  
Aslam Khan ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Performance ◽  
Au Nanoparticles ◽  
Light Illumination ◽  
Visible Light Illumination

Photocatalytic Properties of F-TiO2/Ti Photoelectrodes Prepared by Microarc Oxidation Method under Visible Light Illumination

2011 ◽  
Vol 306-307 ◽  
pp. 1459-1463
Author(s):  
Yan Jun Xin ◽  
De Jie Cui
Keyword(s):  
Visible Light ◽  
Photocatalytic Performance ◽  
Microarc Oxidation ◽  
Photocatalytic Properties ◽  
Light Illumination ◽  
X Ray Diffraction ◽  
Oxidation Method ◽  
X Ray ◽  
Visible Light Illumination ◽  
Morphology And Structure

Wormhole-shaped F-doped TiO2/Ti photoelectrodes were prepared by microarc oxidation method in NaF solution. The morphology and structure of the photoelectrodes were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray fluorescence (XRF). It was found that F-doped TiO2/Ti photoelectrodes were porous and composed of anatase TiO2. The photocatalytic properties of F-doped TiO2/Ti photoelectrodes were investigated by photodiscoloration rate of Rhodamine B(Rh.B) under different conditions. All results showed that the photoelectrodes prepared at voltage of 160V, NaF concentration of 0.01mol/L and oxidation time of 10min have optimal photocatalytic performance. Rh.B was almost completely removed by F-doped TiO2/Ti photoelectrodes after 120min under the illumination of artificial visible light.

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