scholarly journals Enhanced Visible Light Photodegradation of Microplastic Fragments with Plasmonic Platinum/Zinc Oxide Nanorod Photocatalysts

Catalysts ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 819 ◽  
Author(s):  
Tajkia Syeed Tofa ◽  
Fei Ye ◽  
Karthik Laxman Kunjali ◽  
Joydeep Dutta
Keyword(s):  
Zinc Oxide ◽  
Visible Light ◽  
Degradation Kinetics ◽  
Zno Nanorods ◽  
Surface Damage ◽  
Anthropogenic Pollutants ◽  
Ldpe Film ◽  
Green Approach ◽  
Global Concern ◽  
Living Organisms

Microplastics are persistent anthropogenic pollutants which have become a global concern owing to their widespread existence and unfamiliar threats to the environment and living organisms. This study demonstrates the degradation of fragmented microplastics particularly low-density polyethylene (LDPE) film in water, through visible light-induced plasmonic photocatalysts comprising of platinum nanoparticles deposited on zinc oxide (ZnO) nanorods (ZnO-Pt). The ZnO-Pt nanocomposite photocatalysts were observed to have better degradation kinetics for a model organic dye (methylene blue) compared to bare ZnO nanorods, attributed to the plasmonic effects leading to better interfacial exciton separation and improved hydroxyl radical activity along with a 78% increase in visible light absorption. These demonstrations of the plasmonically enhanced photocatalyst enabled it to effectively degrade microplastic fragments as confirmed following the changes in carbonyl and vinyl indices in infrared absorption. In addition, visual proof of physical surface damage of the LDPE film establishes the efficacy of using plasmonically enhanced nanocomposite photocatalytic materials to tackle the microplastic menace using just sunlight for a clean and green approach towards mitigation of microplastics in the ecosystem.

scholarly journals Comparison of photocatalytic activity of ZnO, Ag-ZnO, Cu-ZnO, Ag, Cu-ZnO and TPPS/ZnO for the degradation of methylene blue under UV and visible light irradiation

2021 ◽  
Author(s):  
Mahboubeh Rabbani ◽  
Javad Shokrayian ◽  
Rahmatollah Rahimi ◽  
Rezvaneh Amrollahi
Keyword(s):  
Methylene Blue ◽  
Zinc Oxide ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Diffuse Reflectance Spectroscopy ◽  
Zno Nanorods ◽  
Light Irradiation ◽  
Zinc Oxide Nanorods ◽  
Ft Ir

Abstract In this study, Zinc Oxide and Silver and Copper-doped Zinc Oxide nanorods were synthesized by a simple template-free precipitation technique. In addition, meso-tetrakis (4-sulfonatophenyl) porphyrin (TPPS4) was prepared and immobilized on ZnO nanorods (TPPS/ZnO). The synthesized photocatalysts were characterized by various techniques such as X-Ray Powder Diffraction (XRD), Scanning Electron Microscopy (SEM), UV-visible Spectroscopy, Diffuse Reflectance Spectroscopy (DRS), and Fourier Transform Infrared Spectroscopy (FT-IR). The potential of the obtained photocatalysts in the degradation of methylene blue was investigated under UV and visible light irradiation. The results revealed that the photocatalytic activity of TPPS/ZnO was higher than those of the pure ZnO and doped ZnO under visible light irradiation.

scholarly journals Role of surface defects on visible light enabled plasmonic photocatalysis in Au–ZnO nanocatalysts

RSC Advances ◽  
2015 ◽  
Vol 5 (117) ◽  
pp. 96670-96680 ◽  
Author(s):  
T. Bora ◽  
M. T. Z. Myint ◽  
S. H. Al-Harthi ◽  
J. Dutta
Keyword(s):  
Zinc Oxide ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Surface Defects ◽  
Zno Nanorods ◽  
Visible Light Photocatalytic Activity ◽  
Different Temperatures ◽  
Visible Light Photocatalytic

Visible light photocatalytic activity of the plasmonic gold–zinc oxide (Au–ZnO) nanorods (NRs) is investigated with respect to the surface defects of the ZnO NRs, controlled by annealing the NRs in ambient at different temperatures.

Green synthesized Ag-TiO2 for degradation of organic dye through visible light driven photo-reactor and its kinetics

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Titikshya Mohapatra ◽  
Sakshi Manekar ◽  
Vijyendra Kumar Sahu ◽  
Ashwini Kumar Soni ◽  
Sudip Banerjee ◽  
...  
Keyword(s):  
Visible Light ◽  
Mangifera Indica ◽  
Band Gap Energy ◽  
Photo Degradation ◽  
X Ray ◽  
Green Approach ◽  
Vis Spectroscopy ◽  
Rate Of Reaction ◽  
Visible Light Driven ◽  
Modification Of Titanium

Abstract This study reports a green approach for the modification of titanium dioxide (TiO2) nanoparticles with immobilization of silver nanoparticles. One of the natural sources i.e., Mangifera indica leaf extract was utilized as reducing and capping agent for the fabrication of Ag-TiO2 nanocatalyst. Further, the surface morphology and band-gap energy of prepared Ag-TiO2 were analyzed by Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDS) and UV–Vis spectroscopy. Also, it was characterized by X-ray Powder Diffraction (XRD) which provides the information regarding the crystallinity of the Ag-TiO2. Subsequently, photo activity of Ag-TiO2 was investigated for the degradation of methylene blue (MB) dye wastewater through visible light driven photoreactor. The Ag-TiO2 provided highest (68%) of photo-degradation efficiency within 110 min for 7.81 × 10−5 mol/L initial MB concentration at pH 8 by using 0.19 g/L photocatalyst. Further, addition of 10 mM H2O2 boost up the MB photodegradation to 74%. The kinetic study confirmed the MB degradation followed first order rate of reaction.

Improving the photodetection and stability of a visible-light QDs/ZnO phototransistor via an Al2O3 additional layer

2021 ◽  
Author(s):  
Sungho Park ◽  
Byung Jun Kim ◽  
Tae Yeon Kim ◽  
Eui Young Jung ◽  
Kyu-Myung Lee ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Atomic Layer Deposition ◽  
Quantum Dot ◽  
Aluminum Oxide ◽  
Thin Layer ◽  
Visible Light ◽  
Atomic Layer ◽  
Zno Films ◽  
Additional Layer ◽  
Layer Deposition

We have developed a visible-light phototransistor with excellent photodetection characteristics and stability via atomic layer deposition (ALD) to add a thin layer of aluminum oxide (Al2O3) to quantum dot (QD)/zinc oxide (ZnO) films.

scholarly journals A visible-light phototransistor based on the heterostructure of ZnO and TiO2 with trap-assisted photocurrent generation

RSC Advances ◽  
2021 ◽  
Vol 11 (20) ◽  
pp. 12051-12057
Author(s):  
Byung Jun Kim ◽  
Jun Hyung Jeong ◽  
Eui Young Jung ◽  
Tae Yeon Kim ◽  
Sungho Park ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Visible Light ◽  
Titanium Oxide ◽  
Photocurrent Generation

Visible-light phototransistors have been fabricated based on the heterojunction of zinc oxide (ZnO) and titanium oxide (TiO2).

Fabrication of indium gallium zinc oxide phototransistors via oxide-mesh insertion for visible light detection

2020 ◽  
Vol 8 (1) ◽  
pp. 165-172 ◽  
Author(s):  
Dongwoo Kim ◽  
Yeong-gyu Kim ◽  
Byung Ha Kang ◽  
Jin Hyeok Lee ◽  
Jusung Chung ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Visible Light ◽  
Oxygen Vacancies ◽  
Indium Gallium Zinc Oxide ◽  
Light Detection ◽  
Indium Gallium

Visible light detection of oxide phototransistors via insertion of an oxide-mesh inside the channel creating oxygen vacancies that increase subgap states.

Photo-initiated growth of zinc oxide (ZnO) nanorods

2008 ◽  
Vol 62 (24) ◽  
pp. 4044-4046 ◽  
Author(s):  
E.T.Y. Lee ◽  
Y. Shimotsuma ◽  
M. Sakakura ◽  
M. Nishi ◽  
K. Miura ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Zno Nanorods

Two-Photon Excited Ultraviolet Photoluminescence of Zinc Oxide Nanorods

2008 ◽  
Vol 8 (11) ◽  
pp. 5854-5857 ◽  
Author(s):  
Guangping Zhu ◽  
Chunxiang Xu ◽  
Jing Zhu ◽  
Changgui Lu ◽  
Yiping Cui ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Emission Band ◽  
Single Photon ◽  
Zno Nanorods ◽  
Zinc Oxide Nanorods ◽  
Excitation Wavelength ◽  
Photoluminescence Intensity ◽  
Vapor Phase Transport ◽  
Two Photon ◽  
Oxide Nanorods

High density zinc oxide nanorods with uniform size were synthesized on (100) silicon substrate by vapor-phase transport method. The scanning electron microscopy images reveal that the nanorods have an average diameter of about 400 nm. The X-ray diffraction pattern demonstrates the wurtzite crystalline structure of the ZnO nanorods growing along [0001] direction. The single-photon excited photoluminescence presents a strong ultraviolet emission band at 394 nm and a weak visible emission band at 600 nm. When the ZnO nanorods were respectively pumped by various wavelength lasers from 520 nm to 700 nm, two-photon excited ultraviolet photoluminescence was observed. The dependence of the two-photon excited photoluminescence intensity on the excitation wavelength and power was investigated in detail.

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