scholarly journals Green Synthesis ZnO/TiO2 for High Recyclability Rapid Sunlight Photodegradation Textile Dyes Applications

2021 ◽  
Author(s):  
Erviani Rusman ◽  
Heryanto Heryanto ◽  
Ahmad Nurul Fahri ◽  
Inayatul Mutmainna ◽  
Dahlang Tahir
Keyword(s):  
Green Synthesis ◽  
Calcination Temperature ◽  
Organic Dyes ◽  
Hexagonal Phase ◽  
Synthesis Method ◽  
X Ray Diffraction ◽  
Optical Phonon Mode ◽  
High Potentials ◽  
Calopogonium Mucunoides ◽  
Uv Visible

Abstract Composite ZnO/TiO2 have been successfully synthesized by green synthesis method with various calcination temperature 500oC, 600oC, 700oC, and 800oC (TiO2 concentrations: 2.5 g and 5 g) for photocatalyst application. In this study, Calopogonium mucunoides leaf extract was used as reducing and stabilizing agent. The synthesized composites were characterized by using Fourier Transform Infra-Red (FTIR), X-Ray Diffraction (XRD), and UV-Visible spectroscopy. The XRD spectra shows the hexagonal phase with wurtzite structure of ZnO and anatase for TiO2. The best degradation performance is 98.26% (only 10 min) for ZnO/TiO2 (5 g) with calcination temperature is 800oC. This is due to the highest distance between two optical phonon mode Δ(LO-TO) and lowest attenuating and propagating constant. The composite ZnO/TiO2 shows high potentials photodegradation of organic dyes with the high stable recyclability up to 5 cycles (> 95%) only for every 15 minutes. High potentials for applicability with the concept environmentally friendly principles and stability for circular chemistry, and efficiency of use the energy and chemicals.

scholarly journals Green synthesis and characterization of hexaferrite strontium-perovskite strontium photocatalyst nanocomposites

2020 ◽  
Vol 43 (1) ◽  
pp. 26-42 ◽  
Author(s):  
Zahra Hajian Karahroudi ◽  
Kambiz Hedayati ◽  
Mojtaba Goodarzi
Keyword(s):  
Magnetic Properties ◽  
Green Synthesis ◽  
Sol Gel ◽  
Synthesis Method ◽  
Combustion Method ◽  
Lemon Juice ◽  
X Ray Diffraction ◽  
X Ray ◽  
Auto Combustion

AbstractThis study presents a preparation of SrFe12O19– SrTiO3 nanocomposite synthesis via the green auto-combustion method. At first, SrFe12O19 nanoparticles were synthesized as a core and then, SrTiO3 nanoparticles were prepared as a shell for it to manufacture SrFe12O19–SrTiO3 nanocomposite. A novel sol-gel auto-combustion green synthesis method has been used with lemon juice as a capping agent. The prepared SrFe12O19–SrTiO3 nanocomposites were characterized by using several techniques to characterize their structural, morphological and magnetic properties. The crystal structures of the nanocomposite were investigated via X-ray diffraction (XRD). The morphology of SrFe12O19– SrTiO3 nanocomposite was studied by using a scanning electron microscope (SEM). The elemental composition of the materials was analyzed by an energy-dispersive X-ray (EDX). Magnetic properties and hysteresis loop of nanopowder were characterized via vibrating sample magnetometer (VSM) in the room temperature. Fourier transform infrared spectroscopy (FTIR) spectra of the samples showed the molecular bands of nanoparticles. Also, the photocatalytic behavior of nanocomposites has been checked by the degradation of azo dyes under irradiation of ultraviolet light.

Optimization of Green Synthesis Approach of Silver Nanoparticles Using Indonesian Wild Honey

2021 ◽  
Vol 891 ◽  
pp. 111-115
Author(s):  
Maradhana Agung Marsudi ◽  
Farah Fitria Sari ◽  
Pandu Mauliddin Wicaksono ◽  
Adinda Asmoro ◽  
Arif Basuki ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Synthesis Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Particle Count ◽  
Transmission Electron ◽  
Nitrate Precursor ◽  
Synthesis Approach

In this work, silver nanoparticles have been successfully synthesized using simple and environmentally friendly ‘green synthesis’ method using Indonesian wild honey as mediator. Particle count and size can be optimized by varying the silver nitrate precursor and honey concentration, with the help of sodium hydroxide as pH regulator. Based on X-ray diffraction (XRD) result, crystalline structure of Ag has been confirmed in sample with impurities from AgCl. Based on dynamic light scattering (DLS) and transmission electron microscopy (TEM) results, it was found that the smallest average particles size of AgNPs (117.5 nm from DLS and 11.1 nm from TEM) was obtained at sample with 5% w/v of honey and 0.5 mM of AgNO3.

scholarly journals CaSnO 3 obtained by modified Pechini method applied in the photocatalytic degradation of an azo dye

Cerâmica ◽  
2017 ◽  
Vol 63 (368) ◽  
pp. 536-541 ◽  
Author(s):  
G. L. Lucena ◽  
L. C. de Lima ◽  
L. M. C. Honório ◽  
A. L. M. de Oliveira ◽  
R. L. Tranquilim ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Pechini Method ◽  
Synthesis Method ◽  
Synthesis Temperature ◽  
Point Of Zero Charge ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
Modified Pechini Method ◽  
Golden Yellow ◽  
Uv Visible

Abstract Pure forms of alkaline-earth stannates with perovskite structure (ASnO3, A= Ca2+, Sr2+, Ba2+) have been used as photocatalysts. In this work, CaSnO3 perovskite sample was synthesized by a modified Pechini method at 800 ºC and characterized by X-ray diffraction (XRD), UV-visible spectroscopy, infrared spectroscopy and Raman spectroscopy. The photocatalytic degradation of remazol golden yellow (RNL) dye under UV radiation was evaluated. The XRD pattern showed that the synthesis method favored the orthorhombic CaSnO3 crystallization. According to the Raman spectrum, a material with high short-range order was obtained despite of the relatively low synthesis temperature, compared to the solid-state reaction one. The highest photocatalytic activity was attained at pH 3, which presented 51% discoloration and improved activity of 35% compared to discoloration solely due to adsorption (absence of radiation). The point of zero charge (PZC) and the photocatalytic results indicated that a direct mechanism prevailed at pH 3, whereas an indirect mechanism prevailed at pH 6.

scholarly journals Microwave Assisted Rapid and Green Synthesis of Silver Nanoparticles Using a Pigment Produced byStreptomyces coelicolorklmp33

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Deene Manikprabhu ◽  
K. Lingappa
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Streptomyces Coelicolor ◽  
Biological Synthesis ◽  
Toxic Substances ◽  
X Ray Diffraction ◽  
Chemical Methods ◽  
Major Drawback ◽  
Transmission Electron ◽  
Uv Visible

Traditional synthesis of silver nanoparticles using chemical methods produces toxic substances. In contrast biological synthesis is regarded as a safe and nontoxic process but the major drawback of biological synthesis is, this process is slow. In the present investigation, we developed a rapid and green synthesis of silver nanoparticles employing a pigment produced byStreptomyces coelicolorklmp33 in just 90 s. The silver nanoparticles were characterized by UV-visible spectroscopy, transmission electron microscopy (TEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The biobased synthesis developed in this method is a safe, rapid, and appropriate way for bulky synthesis of silver nanoparticles.

Characterization of iron oxide nanoparticles from the leaf extract of piper betle by green synthesis method

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Gowri Manohari N ◽  
Mohanapriya N
Keyword(s):  
Iron Oxide ◽  
Leaf Extract ◽  
Synthesis Method ◽  
Nano Particles ◽  
Piper Betle ◽  
X Ray Diffraction ◽  
Green Method ◽  
X Ray ◽  
Uv Visible

In this present study, Iron Oxide nano particles were synthesized by using Green method. For this synthesis on Iron oxide, the leaf extract of piper betle was used as a reducing agent and FeCl3 as a precursor. Thus, they were characterized by XRD, SEM,EDX and FTIR. The parity of Fe2O3 nano particles was confirmed by EDX. The crystalline size of Iron Oxide nano particles was analyzed using X-ray Diffraction (XRD) spectrum. The functional groups are identified in Fourier Transform Infrared Spectroscopy (FTIR). The surface morphology of the Iron Oxide Nano particles is found from Scanning Electron Microscopy (SEM). The optical properties are determined by using UV-Visible Spectroscopy. Thus, the so-formed nano particles were Fe2O3.

scholarly journals Synthesis and characterization of lanthanum- and yttrium-doped Fe2O3 pigments

Cerâmica ◽  
2007 ◽  
Vol 53 (325) ◽  
pp. 79-82 ◽  
Author(s):  
D. M. A. Melo ◽  
M. A .F. Melo ◽  
A. E. Martinelli ◽  
Z. R. Silva ◽  
J. D. Cunha ◽  
...  
Keyword(s):  
Rare Earth ◽  
Calcination Temperature ◽  
Structural Changes ◽  
Pechini Method ◽  
Color Stability ◽  
Rare Earth Ions ◽  
X Ray Diffraction ◽  
Rare Earth Ion ◽  
Uv Visible

Iron oxide has been doped with rare earth ions (yttrium or lanthanum) aiming at producing ceramic pigments with hues that vary from orange to brown. The powders were synthesized from polymeric precursors using the Pechini method and subsequently calcined between 900 and 1100 ºC. The resulting pigments were characterized by BET, X ray diffraction, colorimetric analysis, UV-visible, infrared (FTIR), particle size distribution and thermal analysis. The color depicted by La/Fe powders changed as the calcination temperature increased from 900 ºC to 1100 ºC, as established by the corresponding changes in the values of the colorimetric coordinates from L* a* b* = 49.003, 10.541, 12.609 to L* a* b* = 31.279, 6.096, 6.877. On the other hand, Y/Fe powders were little affected by similar changes in the calcination temperature, revealing the effect of yttrium on the color stability of the powder. The values of the colorimetric coordinates in this case varied from L* a* b* = 45.230, 17.315, 28.750 to L* a* b* =51.631, 15.726, 25.825. Structural changes were also noticed as a function of the size of the rare earth ion added to the structure. Upon calcination at 900°C, lanthanum stabilized the ABO3-type perovskite structure whereas the presence of yttrium resulted in a mixture of oxides.

scholarly journals Anticancer Activity of Silver Nanoparticle by Using Cassia auriculata Extract

2020 ◽  
pp. 1-9
Author(s):  
M. Prem Nawaz ◽  
A. Afroos Banu ◽  
S. Raja Mohamed ◽  
M. Palanivelu ◽  
A. Ayeshamariam
Keyword(s):  
Green Synthesis ◽  
Synthesis Method ◽  
Precursor Solution ◽  
Cotton Fabrics ◽  
X Ray Diffraction ◽  
Ag Nps ◽  
X Ray ◽  
Cassia Auriculata ◽  
Transmission Electron ◽  
Mcf 7

In this study, green synthesis of silver nanoparticles (Ag NPs) has done using traditional herbal namely Cassia auriculata extract by the simple Green synthesis method. The synthesized Ag nanoparticles were studied by the characterization techniques includes X-ray diffraction (XRD) crystallography for nature of crystalline with relevant parameters, Transmission electron microscopy (TEM) for particle size as well as the SAED patterns for amorphous, crystalline or polynanocrystalline and Photoluminescence analysis were carried out for the prepared NPs. Ag NPs were fabricated utilizing Phyto-aquatic extract of Cassia auriculata which act as a reducing agent, and it was converted into a precursor solution to coat on cotton fabrics for antibacterial applications. To further, its performance on anticancer application was studied for Michigan Cancer Foundation-7 (MCF-7) line breast cancer.

Green Synthesis of Selenium Nanoparticle using Capparis decidua fruit extract and its Characterization using Transmission Electron Microscopy And UV- Visible Spectroscopy

2021 ◽  
pp. 2129-2132
Author(s):  
B. Madhumitha ◽  
Preetha Santhakumar ◽  
M. Jeevitha ◽  
S. Rajeshkumar
Keyword(s):  
Green Synthesis ◽  
Synthesis Method ◽  
Visible Spectroscopy ◽  
Traditional System ◽  
Selenium Nanoparticle ◽  
Transmission Electron ◽  
Medicinal Properties ◽  
Uv Visible ◽  
Capparis Decidua

Capparis decidua is used in the traditional system of medicine used due to its medicinal properties. Selenium nanoparticle was synthesized in a simple and rapid way by green synthesis method. Selenium nanoparticle was synthesized using aqueous extract of Capparis decidua fruit. The aim of this present study is to synthesize and to analyse the characterization of selenium nanoparticle synthesized using Capparis decidua. Characterization of selenium nanoparticle was done using ultra-visible spectroscopy and Transmission electron microscope [TEM]. Initially, the wavelength obtained for synthesized selenium nanoparticles ranged from 300nm to 600nm. Then TEM was carried out to find the size and shape of the nanoparticle. The selenium nanoparticle was spherical in shape with size of 320nm. The present study concluded that the selenium nanoparticle prepared using Capparis decidua was ecofriendly and may serve and benefit the society because of its rich medicinal property with less side effects if further research is carried out.

scholarly journals GREEN SYNTHESIS, CHARACTERIZATION OF SILVER NANOPARTICLES OF A MARINE RED ALGA SPYRIDIA FUSIFORMIS AND THEIR ANTIBACTERIAL ACTIVITY

2017 ◽  
Vol 9 (5) ◽  
pp. 192 ◽  
Author(s):  
Subbiah Murugesan ◽  
Sundaresan Bhuvaneswari ◽  
Vajiravelu Sivamurugan
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Green Synthesis ◽  
Red Alga ◽  
Diffusion Method ◽  
Present System ◽  
X Ray Diffraction ◽  
Visible Spectroscopy ◽  
X Ray ◽  
Uv Visible

Objective: In the present system, the green synthesis of silver nanoparticles using marine the red alga Spyridia fusiformis and antibacterial activity was carried out.Methods: The seaweed extract was used for the synthesis of AgNPs at room temperature. The silver nanoparticles were characterized by using UV–Visible spectroscopy, Fourier transform infrared spectroscopy, transmission electron microscope and X-ray diffraction (XRD) techniques. The antibacterial activity of biosynthesized silver nanoparticles was carried out by disc diffusion method against pathogenic bacteria.Results: The UV-visible spectroscopy revealed surface plasmon resonance at 450 nm. The FT-IR measurements showed the possible functional groups responsible for the formation of nanoparticles. The X-ray diffraction analysis showed that the particles were crystalline in nature. TEM micrograph has shown the formation of silver nanoparticles with the size in the range of 5–50 nm. The silver nanoparticles synthesized from the S. fusiformis showed higher activity and proved their efficacy in controlling the pathogenic bacterial strains. The nanoparticles showed highest inhibition activity on K. pneumaniae and S. aureus up to 26 and 24±0.01 mm at 100 μg/ml of nanoparticles.Conclusion: The synthesised AgNPs have shown the best antibacterial activity against human pathogens E. coli, K. pneumoniae, S. aureus and P. aeruginosa. The above eco-friendly AgNPs synthesis procedure could be a viable solution for industrial applications in the future and therapeutic needs.

Preparation and Photocatalytic Properties of Loading Nano-TiO2 Modified PHBV Film by Solution Casting

2012 ◽  
Vol 531 ◽  
pp. 116-119 ◽  
Author(s):  
Ting Yan ◽  
Hai Feng Chen
Keyword(s):  
Synthesis Method ◽  
Chloroform Solution ◽  
Methyl Orange Solution ◽  
High Photocatalytic Activity ◽  
Solution Casting ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uniform Dispersion ◽  
Uv Visible ◽  
Orange Solution

As titanium source tetrebutyl titanate modified by reflux preparation, the clean solution containing the nano-TiO2had been prepared by hydrothermal synthesis method. Then the solution was added to the chloroform solution which containing the poly (hydroxybutyrate-co-valerate) (PHBV), and the loading nano-TiO2modified PHBV film was prepared by solution casting processes. X-ray diffraction (XRD) and UV-visible transmission spectra (UV-vis) were used to characterized; in the photocatalytic experiment, 10 ml 5 mg/L methyl orange solution with the 10 mg catalyst, the fade rate reached 90% after 120 min. The thin film obtained in this method has characteristics of high transmittance, high photocatalytic activity, recycling, non-toxic and the loading nano-TiO2of uniform dispersion.

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