Photocatalytic Activity of Heavy Metal Doped CdS Nanoparticles Synthesized by Using Ocimum sanctum Leaf Extract

Green chemical approaches for the production of nanomaterials are currently attracted to research and industry development to minimize the use of hazardous chemicals and reduce industrial pollution. A green reagent Ocimum sanctum leaf extract was used to synthesize doped and undoped CdS nanoparticles in this work. The as-synthesized nanoparticles were characterized by using different characterization techniques such as UV-Vis spectroscopy, XRD, and TEM. The effect of doping on physicochemical properties was analyzed. Photocatalytic properties of these nanoparticles were investigated by sunlight-based photodegradation studies of methylene blue dye. The doping of these green synthesized CdS nanoparticles with heavy metals has improved photocatalytic efficiency over a given time.

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Ultra-sonication enhanced green synthesis of silver nanoparticles using Barleria buxifolia leaf extract and its possible application

10.21203/rs.3.rs-161063/v1 ◽

2021 ◽

Author(s):

Vanaraj sekar

Keyword(s):

Silver Nanoparticles ◽

Green Synthesis ◽

Leaf Extract ◽

Cancer Cell Line ◽

Xrd Analysis ◽

Blue Dye ◽

Multiple Use ◽

Uniform Size ◽

X Ray ◽

Vis Spectroscopy

Abstract A simple and eco-friendly method for the green synthesis of silver nanoparticles (AgNPs) by ultrasound-assisted strategy using Barleria buxifolia leaf extract as a reducing and capping agent was established in this study. The obtained AgNPs were characterized. UV-vis spectrum, Fourier transform infrared spectroscopy (FTIR), scanning and transmission electron microscopy (SEM and TEM), Energy Dispersive X-Ray Analyzer (EDX), X-ray diffraction, dynamic light scattering (DLS) analysis showed that the obtained AgNPs were mono dispersed spheres with uniform size of 80 nm. UV-vis spectroscopy, FTIR, and XRD analysis indicated that the surface of the obtained AgNPs was covered with organic molecules in plant extracts. The results of ABTS assays showed that high antioxidant activity was seen in the obtained AgNPs. Green synthesized AgNPs showed potent antibacterial and anti-biofilm activity against tested pathogens. Cytotoxicity assay showed that the obtained AgNPs were significantly cytotoxic to cancer cell line (MCF-7). In addition, the AgNPs synthesized in this paper can also photo catalytically degrade methylene blue dye under visible light. The potent bioactivity exhibited by the green synthesized silver nanoparticles leads towards the multiple use as antioxidant, antibacterial, anti-biofilm, cytotoxic as well as photo catalytic agent.

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Photocatalytic Comparative Study of TiO2, ZnO, Ag-G-ZnO and Ag-G-TiO2 Nanocomposite Films

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.751.825 ◽

2017 ◽

Vol 751 ◽

pp. 825-830 ◽

Cited By ~ 1

Author(s):

Phuri Kalnaowakul ◽

Tonghathai Phairatana ◽

Aphichart Rodchanarowan

Keyword(s):

Colloidal Solution ◽

Nanocomposite Films ◽

Blue Dye ◽

Methylene Blue Dye ◽

X Ray Diffraction ◽

Sem Images ◽

X Ray ◽

Vis Spectroscopy ◽

Photocatalytic Activities ◽

Xrd Patterns

In this study, the photocatalytic properties and morphology of TiO2, ZnO, Ag-graphene-zinc oxide (Ag-G-ZnO) and Ag-graphene-titanium dioxide (Ag-G-TiO2) nanocomposite were compared. The Ag-G-ZnO and Ag-G-TiO2 nanocomposite were successfully prepared by thermal decomposition of colloidal solution. These prepared composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-Vis spectroscopy and photocatalytic activities. The results from XRD patterns show that Ag-G-TiO2 composites and the Ag-G-ZnO nanocomposites were in the form of fcc and hcp crystal structure, respectively. The SEM images show that at calcination of 500 °C for 3 h, the composite thin film of Ag-G-ZnO and Ag-G-TiO2 were homogenous. In the case of the photocatalytic experiments using methylene blue dye (MB) under UV irradiation, the order of the photocatalytic activities from high to low performances are Ag-G-ZnO, Ag-G-TiO2, ZnO and TiO2, respectively.

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Synthesis of TiO2 Nanoparticles Using Acinetobacter baumanii for Photocatalytic Application

Materials Science Forum ◽

10.4028/www.scientific.net/msf.979.175 ◽

2020 ◽

Vol 979 ◽

pp. 175-179

Author(s):

M. Nagalakshmi ◽

N. Anusuya ◽

S. Karuppuchamy

Keyword(s):

Methylene Blue ◽

Titanium Dioxide ◽

Uv Light ◽

Blue Dye ◽

Biological Method ◽

Methylene Blue Dye ◽

Acinetobacter Baumanii ◽

Uv Light Irradiation ◽

Photocatalytic Application ◽

Vis Spectroscopy

Titanium dioxide (TiO2) nanoparticles have been successfully prepared by biological method and the resulting material was characterized by XRD, FTIR, SEM, EDAX and UV-Vis spectroscopy. The synthesized TiO2 materials successfully degraded the methylene blue dye (MB) under UV light irradiation.

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Photocatalytic Activity of CdS Nanoparticles Obtained by Microbial Synthesis on the Model of Decolorization of Methylene Blue Dye

Biotekhnologiya ◽

10.21519/0234-2758-2020-36-6-127-137 ◽

2020 ◽

Vol 36 (6) ◽

pp. 127-137

Author(s):

O.A. Zhuravliova ◽

T.A. Voeikova ◽

V.G. Debabov

Keyword(s):

Methylene Blue ◽

Bacillus Subtilis ◽

Uv Irradiation ◽

Cds Nanoparticles ◽

Blue Dye ◽

Methylene Blue Dye ◽

Kurchatov Institute ◽

Microbial Synthesis ◽

Bacillus Subtilis 168 ◽

Biogenic Nanoparticles

It has been demonstrated for the first time that biogenic nanoparticles of cadmium sulfide (NPsCdS) obtained using the bacterial strain Bacillus subtilis 168 by an optimized environmentally friendly, nature-like microbial synthesis are able to photocatalytically decolorize methylene blue dye under UV irradiation (365 nm). NPsCdS, characterized as quantum dots, fluoresce in the blue spectral region (400-440 nm), have a spherical shape, a diameter of 5±1 nm and a hydrodynamic diameter of 250--300 nm. The dynamics of methylene blue decolorization was studied depending on the NPsCdS and the dye concentrations, the thickness of the dye solution layer, as well as the power and time of exposure to UV irradiation. The possibility of reusing biogenic NPsCdS for dye decolorization was shown, which characterizes the photostability of the nanoparticles and is relevant for the practical application of biogenic photonanocatalysts. biogenic CdS nanoparticles, Bacillus subtilis 168, photocatalysis, UV irradiation, methylene blue The authors are grateful to the Russian National Collection of Industrial Microorganisms of NRC "Kurchatov Institute" - GOSNIIGENETIKA for providing the bacterial strains and to the Kurchatov Genomic Center-NRC "Kurchatov Institute"- GosNIIGENETIKA for the opportunity to determine the photocatalytic degradation of the dye using biogenic nanoparticles on spectrophotometric equipment. This work was supported by the Russian Foundation for Basic Research in the framework of project no. 19-04-00088.

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BIOMIMETIC SYNTHESIS AND ANTIBACTERIAL PROPERTIES OF STRONTIUM OXIDE NANOPARTICLES USING OCIMUM SANCTUM LEAF EXTRACT

Asian Journal of Pharmaceutical and Clinical Research ◽

10.22159/ajpcr.2018.v11i3.20858 ◽

2018 ◽

Vol 11 (3) ◽

pp. 384 ◽

Cited By ~ 1

Author(s):

Apsana G ◽

George Pp ◽

Devanna N ◽

Yuvasravana R

Keyword(s):

Leaf Extract ◽

Antibacterial Properties ◽

Biomimetic Synthesis ◽

Ocimum Sanctum ◽

Klebsiella Pneumonia ◽

Oxide Nanoparticles ◽

Strontium Nitrate ◽

Strontium Oxide ◽

Synthesis Of Nanoparticles ◽

Vis Spectroscopy

Objective: The investigation and synthesis of nanoparticles using green chemical methods is an emerging field due to ecologically derived materials. In the present study, the reaction under microwave irradiation technique is proposed for synthesizing the strontium oxide nanoparticles (SrO NPs) by reacting the strontium nitrate powder with Ocimum sanctum L. leaf extract followed by heat treatment at 500oC for 2 h.Methods: The crystalline nature, size, and morphological structure of the SrO powder sample were characterized by techniques such as powder X-ray diffraction (PXRD), scanning electron microscopy, ultraviolet (UV)-Vis spectroscopy, Fourier-transform infrared spectroscopy (FTIR) and photoluminescence (PL) spectral analysis. To investigate the antibacterial properties of SrO NPs, pathogens such as Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, Proteus vulgaris, Klebsiella pneumonia, and Morganella morganii was tested in Mueller–Hinton disc diffusion method.Results: The particle size of the SrO NPs is calculated to be 42 nm using Debye–Scherrer equation. The SrO NPs exhibited absorption peak in the range of 250–350 nm centered at 274 nm in UV region. In addition, it is demonstrated that band gap energy was calculated to be 5.39 eV from Tauc’s plot. The SrO NPs has shown the efficient antibacterial effect by inhibiting zone against Gram-negative bacteria.Conclusion: The main aim of the study is to synthesize cost-effective and eco-friendly green synthesis of SrO NPs from the OS (O. sanctum) leaf extract and their characterization. The mechanism for the formation of SrO NPs in the presence of eugenol as reducing agent is also discussed. The present green chemical approach using plant-based materials for the synthesis of nanoparticles enhances the eco-friendliness, compatibility, effectiveness, and reduces the toxicity.

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Magnetic iron oxide nanorod synthesis by Wedelia urticifolia (Blume) DC. leaf extract for methylene blue dye degradation

Applied Nanoscience ◽

10.1007/s13204-020-01366-2 ◽

2020 ◽

Vol 10 (7) ◽

pp. 2219-2227

Author(s):

Mohd Yousuf Rather ◽

Somaiah Sundarapandian

Keyword(s):

Methylene Blue ◽

Iron Oxide ◽

Leaf Extract ◽

Dye Degradation ◽

Blue Dye ◽

Methylene Blue Dye ◽

Magnetic Iron Oxide

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Synthesis of Metal/Silica/Titania Composites for the Photocatalytic Removal of Methylene Blue Dye

Journal of Chemistry ◽

10.1155/2019/9010289 ◽

2019 ◽

Vol 2019 ◽

pp. 1-6 ◽

Cited By ~ 4

Author(s):

Sana Ahmad ◽

Arfa Saeed

Keyword(s):

Methylene Blue ◽

Organic Pollutant ◽

Sol Gel ◽

Blue Dye ◽

Methylene Blue Dye ◽

Reaction Conditions ◽

Structure Morphology ◽

Photocatalytic Removal ◽

Ft Ir ◽

Metal Doped

The present work deals with the synthesis of the metal-doped titanium dioxide/silica composite by using the sol-gel method. The structure, morphology, and composition of the prepared samples were characterized by using Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). The prepared composites were used for the photodegradation of methylene blue dye in sunlight. Different parameters like pH, time, and catalytic concentration were varied to optimize the reaction conditions. Maximum 99.8% degradation was observed with the Ni-doped composite. The results indicate extraordinary efficiency of all metal-doped composites for the removal of the harmful organic pollutant like methylene blue.

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A study on Co doped SnO2 loaded corn cob activated carbon for the photocatalytic degradation of methylene blue dye

10.21203/rs.3.rs-168313/v1 ◽

2021 ◽

Author(s):

Ragupathy S ◽

Ramamoorthy M

Keyword(s):

Methylene Blue ◽

Particle Size ◽

Activated Carbon ◽

Photocatalytic Degradation ◽

Blue Dye ◽

Methylene Blue Dye ◽

Photocatalytic Efficiency ◽

Corn Cob ◽

Photocatalytic Mechanism ◽

Co Doped

Abstract SnO2 with different Co2+ doping concentrations (0.050, 0.075 and 0.10 M), and Co (0.075 M): SnO2/corn cob activated carbon (Co: SnO2/CCAC) were prepared, and are labelled CS1, CS2, CS3 and CS2/CCAC respectively. The CS2/CCAC showed that the particle size is reduced (16.29 nm) with Co2+ doping and CCAC loading. Moreover, CS2/CCAC indicate that the decreased PL intensity and its lower value (2.156 Ω) of impedance from EIS results and increased separation of the photogenerated e−/h+ pairs. Thus, the result showed that CS2/CCAC possesses improved photocatalytic efficiency (95.38 %) as compared to other samples. The photocatalytic mechanism of CS2/CCAC also is discussed.

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