scholarly journals Decolorization of Azodyes by Chemically and Biosynthesized ZnO Nanoparticles

2021 ◽  
Author(s):  
Jasmine Swain ◽  
Padmashree Kulkarni ◽  
Suba Manuel
Keyword(s):  
Zno Nanoparticles ◽  
Waste Water Treatment ◽  
Industrial Effluents ◽  
Dye Decolorization ◽  
Precipitation Method ◽  
Biological Synthesis ◽  
Zno Nps ◽  
Vis Spectroscopy ◽  
Co Precipitation ◽  
Biological Methods

Abstract Dye contaminants in industrial effluents contribute significantly to environmental pollution. Conventional waste water treatment methods are expensive and energy consuming. These limitations could be overcome by the use of nanobioremediation processes. The present work was an effort to study decolorization of azodyes by ZnO nanoparticles (NPs). Rubine GDB (R-GDB) and Congo Red (CR) were the azodyes selected for the study. The ZnO NPs were successfully synthesized by chemical and biological methods. Chemical synthesis of ZnO NPs was carried out by co-precipitation method; biological synthesis was done using bacteria Bacillus subtilis. The synthesized nanoparticles were characterized by UV-Vis Spectroscopy, SEM and XRD. The UV spectrophotometer showed peaks in the range of 300-400 nm. SEM pictures indicated the presence of NPs in the size of 100nm-200nm. XRD results were analyzed on the basis of the peaks that were seen. EDX analysis showed the presence of Zn particles and oxygen particles majorly. Decolorization efficiency was evualated by calculating % decolorization by Meyer’s method. Chemically synthesized NPs showed maximum % decolorization of the R-GDB (89.058 %) and CR (88.888%). The biosynthesized NPs showed the least decolorization (R- GDB -18 % and CR 20.357 %). However, moderate percentages of decolorization of both the azodyes were observed when a combination of the NPs was used (R-GDB -36.072 % and CR- 39.824 %). Nanoparticles showed good potential for the decolorization of the azo dyes. With further optimization of the parameters the present findings show that dye decolorization by chemically synthesized ZnO NPs could be used as a probable nanobioremediation approach to treat wastewaters.

scholarly journals Effect of silver doping on structural and photocatalytic circumstances of ZnO nanoparticles

2020 ◽  
pp. 13-20
Author(s):  
Luma Ahmed ◽  
Eitemad S. Fadhil ◽  
Ayad F. Mohammed
Keyword(s):  
Zno Nanoparticles ◽  
Precipitation Method ◽  
Methyl Green ◽  
Zno Nanoparticle ◽  
Zno Nps ◽  
Force Microscopy ◽  
Ft Ir ◽  
Doped Zno ◽  
Co Precipitation ◽  
Artificial Uv

This article describes the synthesis of ZnO nanoparticles (Nps) using the co-precipitation method and then calcinated at 500oC for 2 h. The photo activity of ZnO nanoparticles was examined in photo decolorization of methyl green dye under artificial UV -A light. This prepared photocatalyst (ZnO Np) was modified his surface by 2% Ag doped using the photo deposition method under inert gas for 3h. The characterization of undoped and 2% Ag doped ZnO Nps were estimated by Fourier-transform infrared spectroscopy (FT-IR), X-ray Diffraction (XRD), and Atomic force microscopy (AFM). In FT-IR analysis, the new peaks occurred around 624-778 cm-1 confirmed the Ag really is doped on prepared ZnO Np. Based on data from XRD, the mean crystal size was reduced with doped the 2% Ag. The AFM images for the prepared photocatalysts ensure that the shapes of all samples are semi-spherical with nanometer size. Series of kinetics experiments were performed for the photocatalytic decolourization of methyl green dye using undoped and 2% Ag doped ZnO nanoparticle and found to be pseudo-first-order kinetics.

scholarly journals Synthesis and growth of spherical ZnO nanoparticles using different amount of plant extract

2021 ◽  
Vol 24 (12) ◽  
pp. 2147-2151
Author(s):  
Y.A. Dallatu ◽  
G.A. Shallangwa ◽  
S.N. Africa
Keyword(s):  
Electron Microscopy ◽  
Plant Extract ◽  
Zno Nanoparticles ◽  
Precipitation Method ◽  
Zno Nps ◽  
Structural Morphology ◽  
Uniform Particles ◽  
Transmission Electron ◽  
Seed Husk ◽  
Co Precipitation

The use of plant extracts has become an interesting ecofriendly method to synthesize and stabilize the different structures nanoparticles (NPs). This work investigated the effect of plant extract as a reducing and stabilizing agent on the growth and morphology of ZnO nanoparticles (ZnO-NPs). Green synthesis and growth of spherical ZnONPs was carried out by co-precipitation method using a Zinc acetate salt and various amounts of Azadirachta indica seed husk extract (20 ml and 40 ml). The synthesized ZnO-NPs were characterized by Fourier transform infrared (FTIR), scanning electron microscopy (SEM-EDX), and transmission electron microscopy (TEM). The FTIR analyses revealed the presence of Phenolic alcohol, amines and carboxylic acid groups and ZnO in synthesized NPs with more intense peaks at higher amount (40 ml) of A. indica extract. Also, structural morphology analyses using SEM revealed uniform spherical shaped particles with diameter from 25 to 60 nm (20 ml of extract) and 19 to 35 nm (40 ml of extract) for ZnO-NPs. The EDX spectral revealed that the required phase of Zn and O was present 69.54% (Zn) and 30.46% (O) at 20 ml of extract, also 73.71% (Zn), 26.26% (O) at 40 ml of extract respectively and confirmed high purity for the synthesized ZnO NPs. TEM revealed spherical shaped NPs with diameter ranging from 28 to 52 nm (20 ml of extract) and 8.2 to 11.9 nm (40 ml of extract) respectively, with a trend reduction in particle size of NPs at higher amount of A. indica seed extract (40 ml) and growth of more uniform particles with no agglomeration. The study showed successful growth of spherical ZnO-NPs with required properties at a higher amount of extract.

scholarly journals Electrical behavior and enhanced photocatalytic activity of (Ag, Ni) co-doped ZnO nanoparticles synthesized from co-precipitation technique

2020 ◽  
Vol 81 (6) ◽  
pp. 1296-1307
Author(s):  
R. Jeyachitra ◽  
S. Kalpana ◽  
T. S. Senthil ◽  
Misook Kang
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Zno Nanoparticles ◽  
Uv Light ◽  
Light Exposure ◽  
Precipitation Method ◽  
Zno Nps ◽  
Transmission Electron ◽  
Doped Zno ◽  
Co Precipitation

Abstract Methylene blue (MB) dye is the most common harmful, toxic, and non-biodegradable effluent produced by the textile industries. The present study investigates the effect of zinc oxide (ZnO) nanoparticles (NPs) and Ag–Ni doped ZnO NPs on the performance of photocatalytic degradation of MB dye. Pure ZnO and Ag–Ni doped ZnO NPs are synthesized using the co-precipitation method. The crystalline nature and surface morphology of the synthesized pure ZnO and Ag–Ni doped ZnO NPs was characterized by powder X-ray diffraction, scanning electron microscopy (SEM), and high resolution transmission electron microscopy (HRTEM) analysis. The presence of spherical-like morphologies was confirmed from SEM and HRTEM analysis. The presence of Ni–O and Zn–O bands in the synthesized materials was found by Fourier transform infrared (FTIR) spectroscopy analysis. The MB dye was degraded under UV-light exposure in various pH conditions. The Ag (0.02%)–Ni doped ZnO NPs exhibits highest photocatalytic activity of 77% under pH 4.

Fe-Doped ZnO Nanoparticles: Structural, Morphological, Antimicrobial and Photocatalytic Characterization

2017 ◽  
Vol 1143 ◽  
pp. 233-239 ◽  
Author(s):  
Viorica Mușat ◽  
Mariana Ibănescu ◽  
Dana Tutunaru ◽  
Florentina Potecaşu
Keyword(s):  
Zno Nanoparticles ◽  
Uv Light ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Zno Nps ◽  
Oxide Semiconductors ◽  
Mueller Hinton ◽  
Vis Spectroscopy ◽  
Mueller Hinton Agar ◽  
Doped Zno

Oxide semiconductors have attracted increasing interest due to their potential in solving environmental problems. ZnO-based nanoparticles (NPs) are among the most investigated for efficient disinfection and microbial control.Iron-doped zinc oxide nanoparticles (Fe:ZnO NPs) were successfully fabricated through precipitation method at low temperature followed by thermal treatment. The obtained Fe:ZnO NPs were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and ultraviolet-visible (UV–Vis) spectroscopy. The effect of iron content on structural, morphological, antimicrobial and photocatalytic properties was investigated and discussed.The photocatalytic activity of the nanoparticles was tested by degradation of methylene blue (MB) solution under UV light for 60 min irradiation. The antibacterial activity was determined by paper disc method on Mueller-Hinton agar against the Gram-negative bacteria Escherichia coli (E. coli) and the Gram-positive bacteria Staphylococcus aureus (S. aureus) and compared to that of the undoped ZnO NPs. Consistent improvement on the photocatalytic and antimicrobial activity of Fe-doped ZnO nanoparticles was noticed.

Synthesis of Multi-walled Carbon Nanotubes Decorated with ZnO/Ag Nanoparticles by Co-precipitation Method

2020 ◽  
Vol 10 (2) ◽  
pp. 127-133 ◽  
Author(s):  
Duha S. Ahmed ◽  
Mohammad R. Mohammed ◽  
Mustafa K.A. Mohammed
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectra ◽  
Zno Nanoparticles ◽  
Ag Nanoparticles ◽  
Precipitation Method ◽  
Zno Nps ◽  
Eds Analysis ◽  
Multi Walled Carbon Nanotubes ◽  
Doped Zno ◽  
Co Precipitation

Background: This research indicated that such abstract are more informative and more readable, in field of preparation of nanocomposite materials. Aim: The purpose of this work represented by decoration of Carbon Nanotubes (CNTs) with nanoparticles using co-precipitation method and exhibit different physical properties from those of CNTs alone and its appropriate for this particular journal. Methods: Preparation MWCNTs surface by Ag/ZnO nanoparticles using two steps represented by acid treatment of MWCNTs in a mixture acid of sulfuric acid (95% H2SO4) and nitric acid (65% HNO3) at 3:1 ratio and second step represented by decoration of Ag/ZnO nanoparticles on FMWCNTs using co-precipitation method to prepare ZnO/Ag nanoparticles decorated on F-MWCNTs as nanocomposite material. Results: The results of this work reveal the decoration of Ag-doped ZnO nanoparticles on the FMWCNTs was achieved without any impurities as shown in XRD, Raman spectra and FTIR and FESEM observations reveal that Ag-doped ZnO nanoparticles have spherical morphologies and adhered on the functionalized MWCNTs, with diameters are about 22-30 nm. Also it is clear that there were no any other materials on the surface of F-MWCNTs except ZnO and Ag which verifies the results obtained from XRD and EDS analysis. Conclusion: In this article, Ag-doped ZnO nanoparticles have been successfully decorated on to modified MWCNTs by an in-situ co-precipitation method. From XRD results, it can be seen that the (002) peak of MWCNTs slightly increased after the addition of Ag-doped ZnO nanoparticles. Raman spectra and FTIR analysis confirmed the formation of Zn-C or Zn-O-C bonds between acid-treated MWCNTs and Ag-doped zinc oxide. The FESEM and EDS analysis revealed that the decoration of Ag-doped ZnO nanoparticles on the F-MWCNTs was achieved without any impurities. Finally, the small sizes Agdoped ZnO NPs deposited on F-MWCNTs make it very promising for biomedicine applications.

Microwave Assisted ZnO Nanoparticles by Simple Precipitation Method: A Novel Approach

2020 ◽  
pp. 2150010
Author(s):  
Lalita D. Deshmukh
Keyword(s):  
Zno Nanoparticles ◽  
Large Scale ◽  
Ph Value ◽  
Aqueous Media ◽  
Chemical Precipitation ◽  
Precipitation Method ◽  
Scale Production ◽  
Zno Nps ◽  
Time Saving ◽  
Vis Spectroscopy

Stated work consisted synthesis of ZnO nanoparticles (NPs) by the irradiation of microwaves. Material is formed by a simple chemical precipitation method by using Zinc Acetate Dehydrate (Zn(CH3COO)2[Formula: see text]2H2O) and Sodium hydroxide (NaOH) as base chemicals in aqueous media for two different pH (12 and 14) values. This synthesis was carried out at room temperature. Synthesized NPs are dried in Microwave oven for 3 min of duration each. X-ray Diffraction (XRD) study confirmed the trend of incremental crystallinity upon increasing pH. XRD reveals the existence of (100), (002), (101), (102) and (110) reflections at [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] two theta values, respectively. Crystallite size was determined by both Scherrer formula and W–H plot method. UV-Vis spectroscopy is utilized to probe the optical features of ZnO NPs. This confirms intrinsic excitonic transition properties of ZnO. UV absorbance shows decrement upon increasing pH value. Band gap depicts the decremental behavior upon increasing pH. Stated method is a novel and time saving method for ZnO NPs synthesis; a large scale production is also feasible by this method.

Solubility Enhancement of Fe in ZnO Nanoparticles Prepared by Co-Precipitation Method

2021 ◽  
Author(s):  
Muhammad Musharaf ◽  
Shumaila Karamat ◽  
Muhammad Umair Hassan ◽  
Uzma Khalique ◽  
Ahmet Oral ◽  
...  
Keyword(s):  
Zno Nanoparticles ◽  
Solubility Enhancement ◽  
Precipitation Method ◽  
Co Precipitation

Structural and Optical Properties of F-Doped ZnO Nanoparticles Synthesized by Co-Precipitation Process

2016 ◽  
Vol 675-676 ◽  
pp. 69-72
Author(s):  
Krisana Chongsri ◽  
Wanichaya Mekprasart ◽  
Wisanu Pecharapa
Keyword(s):  
Zno Nanoparticles ◽  
Fluoride Concentration ◽  
Precursor Solution ◽  
Hexagonal Wurtzite Structure ◽  
Ammonium Fluoride ◽  
Zinc Nitrate ◽  
Precipitation Process ◽  
Vis Spectroscopy ◽  
Doped Zno ◽  
Co Precipitation

In this work, we reported the preparation of F-doped ZnO nanoparticles by facile precipitation process using zinc nitrate and ammonium fluoride as starting precursors for Zn and F, respectively dissolved in deionized water. The precursor solution was prepared at various fluoride composition ranging from 1-5 wt%. The as-precipitated powders were calcined at different temperature from 500 °C to 700 °C for 2 h. Effect of calcination temperature and fluoride concentration on structural, morphologies, optical and electrical properties were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), UV-Vis spectroscopy, respectively. XRD results indicated the complete formation of hexagonal wurtzite structure of ZnO. SEM micrographs showed the agglomeration for each sample that noticeably influenced by fluoride content.

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