scholarly journals Electrospun Nanofibers Embedding ZnO/Ag2CO3/Ag2O Heterojunction Photocatalyst with Enhanced Photocatalytic Activity

Catalysts ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 565 ◽  
Author(s):  
Nurafiqah Rosman ◽  
Wan Norharyati Wan Salleh ◽  
Farhana Aziz ◽  
Ahmad Fauzi Ismail ◽  
Zawati Harun ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Polyvinylidene Fluoride ◽  
Uv Light ◽  
Electrospun Nanofibers ◽  
Electrospinning Process ◽  
Physical Interaction ◽  
Electrospun Nanofiber ◽  
Dye Pollutants ◽  
Photocatalytic Application ◽  
Excellent Photocatalytic Activity

The immobilization of photocatalyst onto substrate has a great potential for energy-intensive separation to avoid the costly separation process and unwanted release of photocatalyst into the treated water. In this study, electrospun nanofiber composed of polyvinylidene fluoride (PVDF) with the immobilized ZnO, ZnO/Ag2CO3, ZnO/Ag2CO3/Ag2O, and ZnO/Ag2O photocatalysts were prepared via the electrospinning process. The immobilized ZnO and heterojunctioned ZnO in the PVDF electrospun nanofiber were proven via X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The electrospinning allowed high chemical binding of the nanofiber composite with good physical interaction between the photocatalyst and the electrospun nanofiber. AFM images obtained for the nanofibers were found to be rougher than that of the pristine PVDF electrospun nanofiber. Among the photocatalyst embedded, the immobilized ZnO/Ag2CO3/Ag2O had endowed the nanofiber with an excellent photocatalytic activity and recyclability for the degradation of the RR120 under UV light irradiation. Based on the results, effective immobilization of ZnO/Ag2CO3/Ag2O in PVDF nanofiber with 99.62% photodegradation in 300 min compared to PVDF-ZnO, PVDF-ZnO/Ag2CO3, and PVDF-ZnO/Ag2O of 28.14%, 90.49%, and 96.34%, respectively. The effective ZnO/Ag2CO3/Ag2O immobilization into polymers with affinity toward organic dye pollutants could both increase the efficiency and reduce the energy requirements for water treatment via the photocatalytic application.

ZnS/HALLOYSITE NANOCOMPOSITES: SYNTHESIS, CHARACTERIZATION AND ENHANCED PHOTOCATALYTIC ACTIVITY

2013 ◽  
Vol 06 (02) ◽  
pp. 1350013 ◽  
Author(s):  
YI ZHANG ◽  
HUAMING YANG
Keyword(s):  
Photocatalytic Activity ◽  
Active Sites ◽  
Uv Light ◽  
Halloysite Nanotubes ◽  
Narrow Particle Size Distribution ◽  
Zns Nanoparticles ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Eosin B ◽  
Excellent Photocatalytic Activity

Zinc sulfide (ZnS) nanoparticles are successfully deposited on the surface of natural halloysite nanotubes (HNTs) to produce ZnS /HNTs nanocomposites. The samples are characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, ultraviolet-visible (UV-vis) spectroscopy and photoluminescence (PL) analysis. The results indicate that ZnS nanoparticles are uniformly attached on the surface of HNTs with narrow particle size distribution center at ~10 nm, and are prevented from aggregation by HNTs and expose more active sites. ZnS /HNTs show excellent photocatalytic activity for the degradation of eosin B under UV light, better than pure ZnS and HNTs, indicating its potential application in the field of environmental protection. The mechanism for photocatalytic activity enhancement is also investigated.

scholarly journals Preparation and Characterization of Levofloxacin-Loaded Nanofibers as Potential Wound Dressings

2017 ◽  
Vol 63 (2) ◽  
pp. 66-69 ◽  
Author(s):  
Noémi Pásztor ◽  
Emőke Rédai ◽  
Zoltán-István Szabó ◽  
Emese Sipos
Keyword(s):  
Electron Microscopy ◽  
Electrospun Nanofibers ◽  
Electrospinning Process ◽  
Wound Dressings ◽  
Dissolution Testing ◽  
Electrospun Nanofiber ◽  
Scanning Calorimetry ◽  
Rapid Release ◽  
Scanning Electron

Abstract Objective: The study aimed at obtaining and characterizing levofloxacin-loaded, poly(ε-caprolactone) electrospun nanofiber formulations to be used as antibacterial wound dressings. Methods: Drug-loaded nanofibers were obtained by the electrospinning process and their morphology was determined using scanning electron microscopy. Structural analysis of the prepared nanofibers was carried out using differential scanning calorimetry and dissolution testing was performed in order to determine drug release. Results: Both nanofiberous formulations (containing 20 % and 50 % w/w levofloxacin) showed dimensions in the range of few hundred nanometers. Thermograms indicated that the formulation containing 20% levofloxacin was totally amorphized, showing a rapid release of the active, in 20 minutes. Conclusions: The poly(ε-caprolactone)-based electrospun nanofibers, containing levofloxacin presented suitable characteristics for obtaining potential antibacterial wound dressings.

scholarly journals Environmentally Benign Organic Dye Conversion under UV Light through TiO2-ZnO Nanocomposite

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1787
Author(s):  
Sandip M. Deshmukh ◽  
Sudhir S. Arbuj ◽  
Santosh B. Babar ◽  
Shoyebmohamad F. Shaikh ◽  
Asiya M. Tamboli ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Uv Light ◽  
Current Approach ◽  
Mixed Metal Oxide ◽  
Light Illumination ◽  
Uv Spectrum ◽  
Novel Approach ◽  
Excellent Photocatalytic Activity ◽  
Degradation Reaction ◽  
Reaction Cycles

In this work, we developed a very simple and novel approach for synthesizing TiO2-ZnO nanocomposites via the urea-assisted thermal decomposition of titanium oxysulphate and zinc acetate at different weight ratios. The synthesized nanocomposite samples were studied by means of HR-TEM, XRD, STEM, UV–Vis DRS, PL and EDS. The observed results demonstrate that the TiO2-ZnO nanocomposite consists of an anatase crystal phase of TiO2 with a crystallite size of 10–15 nm. Combined characterization, including UV–Vis DRS, STEM, EDS and HR-TEM, revealed the successful formation of a heterojunction between TiO2 and ZnO and an improvement in UV spectrum absorption. The photocatalytic activity was explored using MO degradation under ultraviolet light illumination. The results of the optimized TiO2-ZnO nanocomposite show excellent photocatalytic activity and photostability over a number of degradation reaction cycles. In addition, the current approach has immense potential to be used as a proficient method for synthesizing mixed metal oxide nanocomposites.

Highly enhanced photocatalytic properties of ZnS nanowires–graphene nanocomposites

RSC Advances ◽  
2014 ◽  
Vol 4 (58) ◽  
pp. 30798-30806 ◽  
Author(s):  
Jian Cao ◽  
Qianyu Liu ◽  
Donglai Han ◽  
Shuo Yang ◽  
Jinghai Yang ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Uv Light ◽  
Light Irradiation ◽  
Photocatalytic Properties ◽  
Graphene Nanocomposites ◽  
Uv Light Irradiation ◽  
Excellent Photocatalytic Activity

ZnS–graphene nanocomposites exhibit excellent photocatalytic activity for degradation of methylene blue under UV light irradiation.

Zn(ii)–nucleobase metal–organic nanofibers and nanoflowers: synthesis and photocatalytic application

2018 ◽  
Vol 42 (22) ◽  
pp. 17983-17990 ◽  
Author(s):  
Bhagwati Sharma ◽  
Arup Mahata ◽  
Sonam Mandani ◽  
Neha Thakur ◽  
Biswarup Pathak ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Organic Pollutant ◽  
Photocatalytic Application ◽  
Excellent Photocatalytic Activity ◽  
Alkaline Conditions ◽  
Metal Organic

The interaction of Zn2+ ions with pure nucleobases guanine and cytosine under alkaline conditions leads to the formation of nanoscale metal–organic nanofibers and nanoflowers with excellent photocatalytic activity for the degradation of organic pollutant dyes.

Freestanding single layers of non-layered material γ-Ga2O3 as an efficient photocatalyst for overall water splitting

2017 ◽  
Vol 5 (20) ◽  
pp. 9702-9708 ◽  
Author(s):  
Xiaoyan Zhang ◽  
Zizhong Zhang ◽  
Jun Liang ◽  
Yangen Zhou ◽  
Yuecong Tong ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Water Splitting ◽  
Uv Light ◽  
Layered Material ◽  
Light Irradiation ◽  
Overall Water Splitting ◽  
Uv Light Irradiation ◽  
Excellent Photocatalytic Activity

Non-layered γ-Ga2O3 nanosheets were firstly prepared through a facile method and exhibited excellent photocatalytic activity of water splitting under UV light irradiation.

Preparation and Characterization of YMnO3 by Microwave Assisted Process

2017 ◽  
Vol 748 ◽  
pp. 428-432 ◽  
Author(s):  
Fang Fang Peng ◽  
Min Min Jin ◽  
Chun Yu Long ◽  
Pei Song Tang ◽  
Hai Feng Chen
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Uv Light ◽  
Raw Materials ◽  
Manganese Acetate ◽  
Yttrium Nitrate ◽  
X Ray Diffraction ◽  
Microwave Assisted ◽  
Average Grain Size ◽  
Excellent Photocatalytic Activity

Using yttrium nitrate (Y(NO3)3·6H2O), manganese acetate (MnC4H6O4·4H2O), citric acid (C6H8O7·H2O) and urea (CH4N2O) as major raw materials, the YMnO3 was prepared by microwave assisted method. The structure and morphology of samples were characterized by thermogravimetric analysis (TG-DTA), X-ray diffraction (XRD), scanning electron microscope (SEM) and Fourier transform infrared (FT-IR). The results show that the YMnO3 was successfully prepared by microwave process and calcined from 750°C to 1050°C. When the calcination temperature is 850°C, the grain of YMnO3 has good uniformity and the average grain size of 80-100 nm. Under UV-light irradiation, the photocatalytic activity of YMnO3 was studied for methyl orange (MO) used as simulated sewage. The photocatalytic experiment show that the YMnO3 exhibited excellent photocatalytic activity for degradation methyl orange.

An Anion-Exchange Strategy to Bi2S3/Bi2O2(OH)(NO3) Heterojunction with Efficient Visible Light Photoreactivity

NANO ◽  
2018 ◽  
Vol 13 (02) ◽  
pp. 1850016 ◽  
Author(s):  
Jiawei Pang ◽  
Shenghuan Su ◽  
Qiaofeng Han
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Uv Light ◽  
Practical Application ◽  
Visible Light Absorption ◽  
Ion Exchange Reaction ◽  
Thiourea Solution ◽  
Excellent Photocatalytic Activity ◽  
Photochemical Stability

As one of the basic bismuth nitrates, Bi2O2(OH)(NO3) (denoted as BION) has been reported to exhibit powerful photodegradation activity for various contaminants. However, pure BION could only be irradiated by UV light due to broad bandgap ([Formula: see text]3.14[Formula: see text]eV). Herein, Bi2S3/Bi2O2(OH)(NO3) (denoted as BS-BION) heterojunction was prepared by an in situ ion exchange reaction between BION and aqueous thiourea solution ([Formula: see text]). The resulting heterojunction possessed good visible light absorption and closely contacted interfaces, which benefited effective separation and transfer of photogenerated charges, thus leading to excellent photocatalytic activity for the degradation of rhodamine B (RhB) under visible light irradiation. Furthermore, the as-prepared heterojunction photocatalyst also presented high photochemical stability, which may be of great significance for practical application.

Preparation of TiO2/ZnO composite catalysts and their photocatalytic activity for degradation of pentachlorophenol

2017 ◽  
Vol 14 (4) ◽  
pp. 279-283 ◽  
Author(s):  
Juan Xie ◽  
Yongjing Hao ◽  
Meixia Li ◽  
Yiwei Lian ◽  
Li Bian
Keyword(s):  
Photocatalytic Activity ◽  
Uv Light ◽  
Organic Pollutant ◽  
Ultra Violet ◽  
X Ray Diffraction ◽  
Content Type ◽  
Composite Catalysts ◽  
Uv Light Irradiation ◽  
Excellent Photocatalytic Activity ◽  
Good Catalytic Activity

Purpose This paper aims to report a novel preparation method of titanium dioxide (TiO2)/zinc oxide (ZnO) composites with different mole ratios of TiO2:ZnO and their photocatalytic activity. Design/methodology/approach TiO2/ZnO composites are prepared by a facile route. X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM) and ultra-violet–visible diffuse reflectance spectra (UV-vis DRS) are used to characterize the products. Photocatalytic activity of the samples is evaluated by degradation of persistent organic pollutant pentachlorophenol under ultra-violet (UV) irradiation. Findings It is found that all the as-prepared TiO2/ZnO composites not only have good catalytic activity under UV light irradiation, but also have excellent circulation stability. The optimal mole ratio of TiO2:ZnO is 0.75:1. Originality/value This report presents a simple and rapid method for the preparation of TiO2/ZnO composites with excellent photocatalytic activity. Experimental results could provide useful reference for the treatment of chlorophenols in the future.

scholarly journals Solvothermal Synthesis and Photocatalytic Properties of Nitrogen-Doped SrTiO3Nanoparticles

2010 ◽  
Vol 2010 ◽  
pp. 1-6 ◽  
Author(s):  
Uyi Sulaeman ◽  
Shu Yin ◽  
Tsugio Sato
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Solvothermal Synthesis ◽  
Uv Light ◽  
Nitrogen Doped ◽  
Light Region ◽  
Excellent Photocatalytic Activity ◽  
Degussa P25 ◽  
Perovskite Type ◽  
Visible Light Photocatalytic

Perovskite-type nitrogen-doped SrTiO3nanoparticles of 50–80 nm in diameter were successfully synthesized by the solvothermal of Ti(OC3H7)4, SrCl2⋅6H2O, and hexamethylenetetramine in KOH aqueous solution. Nitrogen-doped SrTiO3showed excellent photocatalytic activity under both UV and visible light irradiation, that is, the photocatalytic activity of N-doped SrTiO3for DeNOxreaction was greater than that of SrTiO3and commercial TiO2(Degussa P25) in both visible light region (>510 nm) and UV light region (>290 nm). The excellent visible light photocatalytic activity of this substance was caused by generating a new band gap that absorbs visible light.

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