Photocatalytic Degradation of Naphthol Green B Dye Using Coupled CdS-ZnMoO4 in UV-A Light Irradiation

2021 ◽  
Vol 21 (3) ◽  
pp. 1526-1536
Author(s):  
Gomathyjayamani ◽  
M. Swaminathan ◽  
M. Shanthi
Keyword(s):  
Dye Degradation ◽  
Visible Region ◽  
Xrd Analysis ◽  
Binding Energies ◽  
Light Irradiation ◽  
Effective Parameters ◽  
Sem Images ◽  
Field Development ◽  
Cyclic Movement ◽  
Naphthol Green B

At present, nanotechnology field development makes a major role in photocatalysis. CdS-ZnMoO4 (36.6 wt%) coupled nanophotocatalyst is synthesized using facile hydrothermal method. The CdSZnMoO4 catalyst shows superior photocatalytic activity in the Naphthol Green B (NGB) dye degradation in UV-A (365 nm) light irradiation. XRD analysis reveals the monoclinic structure of ZnMoO4, cubic structure of CdS. PL shows lesser the recombination (e−–h+) rate of electron–hole pair formation. UV-Vis-DRS reveals an increase in absorption in entire visible region while loading with CdS. SEM images indicate that CdS-ZnMoO4 has nanofibrous structure. EDS reveal that Cd and S are present on the ZnMoO4 surface. ECM indicates the division of homogeneity in elements. SAED pattern of HR-TEM images proved high crystalline properties of the catalyst. XPS reveals the different oxidation states and term-symbols of Cd, S, Zn, Mo and O in this catalyst with corresponding binding energies. CdS-ZnMoO4 (18.5 m2g−1) has a higher surface area compared to ZnMoO4 (10.8 m2g−1). Current densities obtained from CV reveals the higher cyclic movement of electrons (electrochemical activity) of CdS-ZnMoO4. An effective parameters for photodegradability of NGB dye by CdS-ZnMoO4 was analyzed.

Synthesis of PAN Fiber Supported Fe(bpy)32+ for RhB Degradation under Visible Light Irradiation

2012 ◽  
Vol 268-270 ◽  
pp. 225-228
Author(s):  
Zhen Bang Han ◽  
Jia Guo ◽  
Wei Li
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Rhodamine B ◽  
Dye Degradation ◽  
Visible Region ◽  
Light Irradiation ◽  
Pan Fiber ◽  
Fenton Catalyst ◽  
Ionic Bonds ◽  
Coordination Effect

The amidoximated Polyacrylonitrile (PAN) fiber was applied for the support to immobilize Fe(bpy)32+ through ionic bonds, and the obtained fibrous complex was used as heterogeneous Fenton catalyst for the degradation of Rhodamine B under visible light irradiation. The results indicated that increasing Fe(bpy)32+ concentration in solution led to higher Fe(bpy)32+ content on the prepared catalysts, and the amidoxime groups helped greatly for the immobilization of Fe(bpy)32+ via coordination effect. This catalyst exhibits an obvious absorption in the visible region and could effectively degrade Rhodamine B in the presence of H2O2 under visible light irradiation. In addition, no deactivation of the catalyst was observed even after five consecutive runs of dye degradation.

Direct Sunlight Active Sm3+ Doped TiO2 Photocatalyst

2016 ◽  
Vol 855 ◽  
pp. 33-44 ◽  
Author(s):  
Binu Naufal ◽  
P.K. Jaseela ◽  
Pradeepan Periyat
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Uv Light ◽  
Sol Gel ◽  
Visible Region ◽  
Light Irradiation ◽  
Significant Shift ◽  
Sem Images ◽  
Blue Solution

TiO2 and Sm3+ doped TiO2 nanocrystalline has been successfully synthesized by a modified sol-gel method. As synthesized samples of TiO2 and Sm3+ doped TiO2 were calcined at 300, 500, 700 and 800OC and characterized by various techniques such as XRD, UV/Vis Reflectance spectroscopy, FTIR, SEM-EDS and TEM. The crystallite size of Sm3+ doped TiO2 at all calcination temperature is lower than that of TiO2 due the doping Sm3+ ion and thereby induced more nanobehavior. FTIR spectroscopy confirmed the presence of Ti-O and Ti-O-Ti bond in TiO2, in Sm3+ doped TiO2 along with Ti-O and Ti-O-Ti, the presence Sm-O and Ti-O-Sm bonds are confirmed. Diffuse reflectance spectra showed that the Sm3+ doped TiO2 have a significant shift to longer wavelengths and an extension of the absorption in the visible region compared to the TiO2. SEM images confirmed that the particles are agglomerated and the particle size was decreased in the Sm3+ doped TiO2 in comparison with the TiO2. EDS analysis showed the presence of Sm3+ ion present in the lattice of TiO2 in doped sample. Finally the photocatalytic activity of TiO2 and Sm3+ doped TiO2 at various calcinations temperatures was investigated by the degradation of methylene blue solution under UV light and visible light. Doping with the samarium ions significantly enhanced the overall photocatalytic activity for MB degradation under both UV and visible light irradiation. The results showed that the Sm3+ doped TiO2 sample calcined at 700 OC shows the highest photocatalytic activity under UV light and visible light irradiation.

scholarly journals Design of Ag Injection in Bi2S3 (AgBiS2) Thin Films for Photoelectrochemical Cell and Solar Cell Applications

2021 ◽  
Author(s):  
Daniel T ◽  
Balasubramanian V ◽  
Sivakumar G ◽  
Kannusamy Mohanraj
Keyword(s):  
Solar Cell ◽  
Visible Region ◽  
Xrd Analysis ◽  
Photoelectrochemical Cell ◽  
Spherical Particles ◽  
Optical Absorption Coefficient ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Better Than

Abstract This study reports the opto-structural, morphological, topological and electrical properties of thermally evaporated AgxBi2-xS3-y thin film prepared for various x and y values (x= y= 0, 0.25, 0.50, 0.75 and 1). The films have cubic structured AgBiS2 along with orthorhombic structured Bi2S3 as confirmed from X-ray diffraction (XRD) analysis. The films showed higher optical absorption coefficient (105cm-1) in the visible region and band gap values are found to be decreased from 2.08 eV to 1.35 eV for AgxBi2-xS3-y (x= y = 0 to 1) films. Scanning electron microscope (SEM) images showed the uniform distribution of spherical particles. Carrier concentration of the films are better than x= y= 0 as observed from Hall effect and Mott- Schottky plots. The FTO/ AgxBi2-xS3-y (x= y = 1) photoelectrochemical cell yields the photoconversion efficiency (PCE) of 7.03 %. The device FTO/ AgxBi2-xS3-y (x= y = 1) CdS/Ag solar cell has exhibited PCE of 3.26%.

scholarly journals Fast Dissolving Electrospun Nanofibers Fabricated from Jelly Fig Polysaccharide/Pullulan for Drug Delivery Applications

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 241
Author(s):  
Thangavel Ponrasu ◽  
Bei-Hsin Chen ◽  
Tzung-Han Chou ◽  
Jia-Jiuan Wu ◽  
Yu-Shen Cheng
Keyword(s):  
Drug Delivery ◽  
Water Vapor Permeability ◽  
Electrospun Nanofibers ◽  
Average Diameter ◽  
Xrd Analysis ◽  
Water Soluble ◽  
Vapor Permeability ◽  
Uv Spectrum ◽  
Sem Images ◽  
Triton X

The fast-dissolving drug delivery systems (FDDDSs) are developed as nanofibers using food-grade water-soluble hydrophilic biopolymers that can disintegrate fast in the oral cavity and deliver drugs. Jelly fig polysaccharide (JFP) and pullulan were blended to prepare fast-dissolving nanofiber by electrospinning. The continuous and uniform nanofibers were produced from the solution of 1% (w/w) JFP, 12% (w/w) pullulan, and 1 wt% Triton X-305. The SEM images confirmed that the prepared nanofibers exhibited uniform morphology with an average diameter of 144 ± 19 nm. The inclusion of JFP in pullulan was confirmed by TGA and FTIR studies. XRD analysis revealed that the increased crystallinity of JFP/pullulan nanofiber was observed due to the formation of intermolecular hydrogen bonds. The tensile strength and water vapor permeability of the JFP/pullulan nanofiber membrane were also enhanced considerably compared to pullulan nanofiber. The JFP/pullulan nanofibers loaded with hydrophobic model drugs like ampicillin and dexamethasone were rapidly dissolved in water within 60 s and release the encapsulants dispersive into the surrounding. The antibacterial activity, fast disintegration properties of the JFP/pullulan nanofiber were also confirmed by the zone of inhibition and UV spectrum studies. Hence, JFP/pullulan nanofibers could be a promising carrier to encapsulate hydrophobic drugs for fast-dissolving/disintegrating delivery applications.

Enhanced Photocatalytic Performance of Sn6SiO8 Nanoparticles and Their Reduced Graphene Oxide (rGO) Nanocomposite

2020 ◽  
Vol 20 (9) ◽  
pp. 5426-5432
Author(s):  
G. Gnanamoorthy ◽  
M. Muthukumaran ◽  
P. Varun Prasath ◽  
V. Karthikeyan ◽  
V. Narayanan ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Performance ◽  
Separation Efficiency ◽  
Dye Degradation ◽  
Hexagonal Phase ◽  
Active Species ◽  
Organic Chemical ◽  
Light Illumination ◽  
Sem Images ◽  
Radical Trapping

Photocatalysts provide excellent potential for the full removal of organic chemical pollutants as an environmentally friendly technology. It has been noted that under UV-visible light irradiation, nanostructured semiconductor metal oxides photocatalysts can degrade different organic pollutants. The Sn6SiO8/rGO nanocomposite was synthesized by a hydrothermal method. The Sn6SiO8 nanoparticles hexagonal phase was confirmed by XRD and functional groups were analyzed by FT-IR spectroscopy. The bandgap of Sn6SiO8 nanoparticles (NPs) and Sn6SiO8/GO composites were found to be 2.7 eV and 2.5 eV, respectively. SEM images of samples showed that the flakes like morphology. This Sn6SiO8/rGO nanocomposite was testing for photocatalytic dye degradation of MG under visible light illumination and excellent response for the catalysts. The enhancement of photocatalytic performance was mainly attributed to the increased light absorption, charge separation efficiency and specific surface area, proved by UV-vis DRS. Further, the radical trapping experiments revealed that holes (h+) and superoxide radicals (·O−2) were the main active species for the degradation of MG, and a possible photocatalytic mechanism was discussed.

Photocatalytic Degradation of Methylene Blue by NiO Thin Films under Solar Light Irradiation

2019 ◽  
Vol 56 ◽  
pp. 152-157 ◽  
Author(s):  
Abdelouahab Noua ◽  
Hichem Farh ◽  
Rebai Guemini ◽  
Oussama Zaoui ◽  
Tarek Diab Ounis ◽  
...  
Keyword(s):  
Thin Films ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Sol Gel ◽  
Visible Region ◽  
Optical Transmittance ◽  
Dip Coating ◽  
Light Irradiation ◽  
Solar Light ◽  
Solar Light Irradiation

Nickel oxide (NiO) thin films were successfully deposited by sol-gel dip-coating method on glass substrates. The structural, morphological and optical properties in addition to the photocatalytic activity of the prepared films were investigated. The results show that the films have a polycrystalline NiO cubic structure with dense NiO grains and average optical transmittance in the visible region. The photocatalytic properties of the films were studied through the degradation of methylene blue and 89% of degradation was achieved for 4.5h of solar light irradiation exposure which indicates the capability of NiO photocatalytic activity.

Photocatalytic Degradation of Methylene Blue over Co-Ag3VO4 under Visible Light Irradiation

2011 ◽  
Vol 335-336 ◽  
pp. 1385-1390 ◽  
Author(s):  
Shuo Wiei Zhao ◽  
Hui Xu ◽  
Hua Ming Li ◽  
Yuan Guo Xu
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Absorption Edge ◽  
Diffuse Reflectance Spectroscopy ◽  
Dye Degradation ◽  
Light Irradiation ◽  
Experimental Conditions ◽  
X Ray

In order to improve the photocatalytic activity, Co was successfully loaded into Ag3VO4 by using impregnation process. The samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDS) and diffuse reflectance spectroscopy (DRS). The XRD and SEM–EDS analyses revealed that Co ion was dispersed on Ag3VO4. The DRS results indicated that the absorption edge of the Co–Ag3VO4 catalyst shifted to longer wavelength. The enhanced photocatalytic activity of Co–Ag3VO4 for Methylene Blue(MB) dye degradation under visible light irradiation was due to its wider absorption edge and higher separation rate of photo-generated electron and holes. In the experimental conditions, it is demonstrated that the MB was effectively degraded by more than 95% within 40 min when the Co–Ag3VO4 catalyst was calcined at 300°C with 1 wt.% Co content.

Li(Ni1/3Co1/3Mn1/3)O2 with High Rate Capability Synthesized via a Novel Gel-Combustion Method

2011 ◽  
Vol 391-392 ◽  
pp. 973-977
Author(s):  
Jing Mao ◽  
Ke Hua Dai ◽  
Yu Chun Zhai
Keyword(s):  
Energy Dispersive Spectrometer ◽  
Rate Capability ◽  
Chelating Agent ◽  
Combustion Method ◽  
Xrd Analysis ◽  
High Rate ◽  
High Rate Capability ◽  
Sem Images ◽  
Gel Combustion ◽  
Gel Combustion Method

Li(Ni1/3Co1/3Mn1/3)O2material with high rate capability was synthesized by a novel gel-combustion method using polyvinylpyrrolidone as a polymer chelating agent and a fuel. X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) were used to study the structure, morphology and element distribution of the Li(Ni1/3Co1/3Mn1/3)O2material. XRD analysis showed that all samples were α-NaFeO2structure and Li(Ni1/3Co1/3Mn1/3)O2prepared at 900 °C had the highest c/a of 4.977 indicating the highest layered-ness. EDS scan demonstrated that the precursor was homogeneous. SEM images indicated all samples were well crystallized. Charge and discharge tests showed all samples had good rate capability. Among them, Li(Ni1/3Co1/3Mn1/3)O2prepared at 900 °C had the highest capacity and the best rate capability. It delivered 162.1 mAh•g−1at 0.25 C between 2.5 and 4.3 V and the capacity retention was about 81% compared to that of 0.25C rate.

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