Waste management in zinc promoted allylation of aldehyde

2016 ◽  
Vol 40 (6) ◽  
pp. 5347-5356 ◽  
Author(s):  
Sanjay Pratihar ◽  
Anindita Kakoty ◽  
Kasturi Sarmah
Keyword(s):  
Waste Management ◽  
Wurtzite Phase ◽  
Hexagonal Wurtzite Phase

The waste zinc material in Zn(0) promoted Grignard–Barbier type allylation of aldehydes has been successfully utilized as a reusable material for the adsorption of various dyes and also converted into the corresponding hexagonal wurtzite phase of ZnO.

scholarly journals Studies on the Growth Control of ZnO Nanostructures synthesized by the Chemical Method

2018 ◽  
Vol 23 (2) ◽  
Author(s):  
Patricia María Perillo ◽  
Mariel Nahir Atia ◽  
Daniel Fabián Rodríguez
Keyword(s):  
Chemical Method ◽  
Morphological Evolution ◽  
Zno Nanorods ◽  
Growth Control ◽  
Zno Nanostructures ◽  
X Ray Diffraction ◽  
Wurtzite Phase ◽  
X Ray ◽  
Hexagonal Wurtzite Phase

ABSTRACT ZnO nanostructures were synthesized through a chemical method using different Zn precursors and hexamethylenetetramine (HMTA) at 90 °C. The effects of the reactants on the morphological evolution of ZnO nanorods were investigated. The samples were characterized by using XRD, SEM, EDX and BET. The hexagonal wurtzite phase of ZnO was confirmed by X-ray diffraction (XRD). The performed analysis indicated that different morphologies were obtained by changing the reactants.

Effects of the Precursor Solution Addition Time in the Solochemical Synthesis of ZnO Nanocrystals

2012 ◽  
Vol 727-728 ◽  
pp. 856-860
Author(s):  
Marivone Gusatti ◽  
Carlos Eduardo Maduro de Campos ◽  
Gilvan Sérgio Barroso ◽  
Daniel Aragão Ribeiro de Souza ◽  
Camila Cardoso Milioli ◽  
...  
Keyword(s):  
Crystallite Size ◽  
Precursor Solution ◽  
Particle Morphology ◽  
Wurtzite Phase ◽  
X Ray ◽  
Zno Nanocrystals ◽  
Transmission Electron ◽  
Nanometric Particles ◽  
Crystalline Domains ◽  
Hexagonal Wurtzite Phase

The solochemical method was applied to prepare ZnO nanocrystals at low temperature, using sodium hydroxide and zinc chloride as starting materials. In this work, different addition times of the precursor solution were adopted and their effects on the crystalline domains (or crystallite) size and particle morphology of the obtained samples were investigated. The synthesized products were characterized by X-ray powder diffraction (XRPD) and transmission electron microscopy (TEM) techniques. The XRPD results revealed that all samples produced have a single ZnO hexagonal wurtzite phase (space groupP63mc) under anisotropic strain. The parallel to perpendicular crystallite size ratio was about 1.21 for the sample produced with instantaneous addition of the precursor solution and 1.19 for 1 h longer addition time. The anisotropic strains become about 12% smaller for the sample produced with longer addition time. The TEM results of the samples showed ZnO nanometric particles with nearly rounded and rod-like morphologies.

scholarly journals Synthesis and optical properties of self-assembled flower-like CdS architectures by mixed solvothermal process

2010 ◽  
Vol 8 (5) ◽  
pp. 1027-1033 ◽  
Author(s):  
Junhao Zhang ◽  
Yuhui Wu ◽  
Jia Zhu ◽  
Shaoxing Huang ◽  
Dongjing Zhang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Optical Properties ◽  
X Ray Diffraction ◽  
Wurtzite Phase ◽  
Strong Emission ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Self Assembled ◽  
Xrd Patterns ◽  
Hexagonal Wurtzite Phase

AbstractSelf-assembled CdS architectures with flower-like structures have been synthesized by a mixed solvothermal method using ethylene glycol and oleic acid as the mixed solvent at 160°C for 12 h. The results of X-ray diffraction (XRD) patterns, field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) images indicate that the product exists as the hexagonal wurtzite phase and conatins of larger numbers of flower-like CdS architectures with diameters of 1.8–3 μm. The selected-area electron diffraction (SAED) pattern and the high resolution transmission electron microscope (HRTEM) image reveal that the grain has better crystallinity. The optical properties of flower-like CdS architectures were also investigated by ultraviolet-visable (UV-vis) and photoluminescence spectroscopy at room temperature. A strong peak at 490 nm is shown in the UV-vis absorption, while an emission at 486 nm and another strong emission at 712 nm are shown in the PL spectrum.

Synthesis and Characterization of Multi-Angular Branched ZnO Microstructures and Peculiar Nanopushpins Obtained by Thermal Treatment from Compacted ZnS Powder

2019 ◽  
Vol 286 ◽  
pp. 23-30
Author(s):  
J.R. Mora ◽  
Gregorio Flores-Carrasco ◽  
Mauricio Pacio ◽  
T.G. Díaz-Rodríguez ◽  
Hector Juárez
Keyword(s):  
Thermal Treatment ◽  
Treatment Process ◽  
Treatment Temperature ◽  
Complex Structures ◽  
Wurtzite Phase ◽  
Free Process ◽  
Different Temperatures ◽  
Short Time ◽  
Hexagonal Wurtzite Phase

Multi-angular branched ZnO microstructures with rods-shaped tips and nanopushpins with hexagonal cap on top have been synthesized by a simple thermal treatment process of compacted ZnS powder used as starting material and substrate. The structures have been grown at different temperatures (800, 900 and 1000 °C) for 60 min, in a constant nitrogen environment at atmospheric pressure via a catalyst-free process. XRD results of the as-grown products from ZnS powder show a significant reduction in the cubic zincblende phase to the hexagonal wurtzite phase with the increase of treatment temperature, as compared to the bulk value. Post-anneal analyses indicated that the transformation of morphologies of the as-grown structures also depends strongly on the treatment temperature. The proposed method represents an easy and economical way to grow complex structures of ZnO, with a relatively short time, furthermore, without the neediness of use an external substrate to grow. These new and interesting nanostructures have potential in applications such as optoelectronics.

Processing of Zinc Sulfide Based Electroluminescent Material Using TNT in a High Pressure Vessel

2011 ◽  
Vol 673 ◽  
pp. 143-148
Author(s):  
Greg Kennedy ◽  
Naoyuki Wada ◽  
Y. Hayashi ◽  
M. Kurihara ◽  
Kazuyuki Hokamoto ◽  
...  
Keyword(s):  
High Pressure ◽  
Zinc Sulfide ◽  
Electronic Devices ◽  
Luminescent Properties ◽  
Battery Life ◽  
Luminescent Materials ◽  
X Ray Diffraction ◽  
Wurtzite Phase ◽  
High Brightness ◽  
Hexagonal Wurtzite Phase

Electroluminescent, EL, materials are of interest in providing high brightness for display screens found in portable electronic devices, where the battery life is limited. Currently organic luminescent materials are being used, but the lifetime is low due to the degradation of the organic material under electric field over time. Some recent work with inorganic material of zinc sulfide has indicated high brightness at very long life times. This work focuses on the thermal processing of the zinc sulfide based EL material with trinitrotoluene, TNT. The zinc sulfide based phosphor and TNT are placed in a stainless steel container that can withstand high pressure. After closing, the chamber was evacuated and subsequently heated to over 300°C. The ZnS based phosphor was heated to a high temperature as the TNT decomposed. The sample was recovered after cooling and separated by optical observation of photoluminescence with a ultraviolet lamp. X-ray diffraction analysis showed that some transformation to hexagonal wurtzite phase occurred and was retained after cooling. EL and photoluminescence, PL, measurements were performed to characterize the luminescent properties of the material. Results of SEM observations of the particle sizes are discussed. The most recent data shows that blue luminescence at 450nm can be obtained by the treatment of ZnS phosphor with TNT in this high pressure containment device.

scholarly journals Synthesis And Studied Structural and Morphological Properties of 1-Dimensional Zno-Ag2O-Ag Nanowire

2022 ◽  
Vol 961 (1) ◽  
pp. 012016
Author(s):  
Lujain Nazeeh Yousif ◽  
Noor M. Ibrahim ◽  
Reham Ihssan Kamel ◽  
Muntadher I. Rahmah
Keyword(s):  
Chemical Method ◽  
Silver Oxide ◽  
Morphological Properties ◽  
Dimensional Structure ◽  
X Ray Diffraction ◽  
Wurtzite Phase ◽  
X Ray ◽  
Diffraction Peaks ◽  
Hexagonal Wurtzite Phase ◽  
Ag Nanowire

Abstract 1-dimensional zinc oxide (ZnO) - silver oxide (Ag2O) – silver (Ag) nanowire was prepared using a simple and inexpensive bottom-up chemical method. X-ray diffraction (XRD) results showed the presence of diffraction peaks of ZnO and Ag2O with hexagonal wurtzite phase of ZnO. Energy Dispersive X-ray (EDX) results showed the presence of energy peaks of Zinc (Zn), Silver (Ag), and Oxygen (O) elements. Filed Emission Scanning Electron Microscopy (FE-SEM) results showed that the surface morphology is nanowire (1-dimensional structure) with shapes similar to hedgehog spines and have small nanoscale diameters. The present work represents a promising step in the preparation of a 1-dimensional nanowire.

Effect of RGO/ZnxCd1−xS crystalline phase on solar photoactivation processes

RSC Advances ◽  
2016 ◽  
Vol 6 (52) ◽  
pp. 46282-46290 ◽  
Author(s):  
Omran Moradlou ◽  
Neda Tedadi ◽  
Alireza Banazadeh ◽  
Naimeh Naseri
Keyword(s):  
Phase Transition ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Crystalline Phase ◽  
Light Irradiation ◽  
Cubic Phase ◽  
Wurtzite Phase ◽  
Crystal Phase Transition ◽  
Hexagonal Wurtzite Phase ◽  
Main Factor

Crystal phase transition from cubic phase in RGO/Zn0.9Cd0.1S to hexagonal wurtzite phase in RGO/Zn0.8Cd0.2S occurs and the crystalline phase is the main factor influencing the photoresponsivity of RGO/ZnxCd1−xS under visible light irradiation.

LOW TEMPERATURE SYNTHESIS OF Fe-DOPED ZnO NANOROD BUNDLES IN AQUEOUS SOLUTION

NANO ◽  
2006 ◽  
Vol 01 (02) ◽  
pp. 153-157 ◽  
Author(s):  
ZHIGANG ZHAO ◽  
FENGXIA GENG ◽  
HONGTAO CONG ◽  
JINBO BAI ◽  
HUI-MING CHENG
Keyword(s):  
Aqueous Solution ◽  
Low Temperature ◽  
Zno Nanorods ◽  
Zno Nanorod ◽  
X Ray Diffraction ◽  
Wurtzite Phase ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Doped Zno ◽  
Hexagonal Wurtzite Phase

Pure and Fe -doped ZnO nanorod bundles were synthesized in aqueous solution at low temperature, in which inexpensive reagents such as Zn ( NO 3)2, NaOH and Fe ( NO 3)3 were used as precursors. The composition of the final product can be roughly tuned by the precursor ratio used. Energy dispersive X-ray spectroscopy confirms the successful incorporation of Fe element into ZnO nanorods, and X-ray diffraction reveals that ZnO nanorod bundles have a pure hexagonal wurtzite-phase structure. UV–vis spectroscopy show that the spectrum shifts to longer wavelength with increasing iron doping.

scholarly journals Photoluminescence Emission and Raman Vibration Properties of Asymmetric Nanoparticle ZnO Doped Mn2+ Fabricated by a Solvothermal Method

2019 ◽  
Vol 35 (3) ◽  
Author(s):  
Nguyen Xuan Sang
Keyword(s):  
Solvothermal Method ◽  
Morphological Properties ◽  
Defect States ◽  
Wurtzite Phase ◽  
Zno Nanostructure ◽  
Band Emission ◽  
Transmission Electron ◽  
Hexagonal Wurtzite Phase

In this study, ZnO doped Mn2+ nanoparticle with hexagonal wurtzite phase was fabricated by a solvothermal method where various contents of Mn ion were in situ doped in ZnO nanostructure. The crystal structure and morphological properties were investigated by X-ray diffractometry, Raman spectroscopy and transmission electron microscopy. The photoluminescence (PL) was measured at room temperature showed red-shift of near-band-to-band emission and the evolution of visible emissions in the doped samples. This work analyzed the PL characteristics of synthesized samples and revealed the role of the dopant Mn2+ on defect states of ZnO.

scholarly journals Tin as an Effective Doping Agent into ZnO for the Improved Photodegradation of Rhodamine B

2021 ◽  
Vol 21 (4) ◽  
pp. 2529-2537
Author(s):  
Aqeel Ahmed Shah ◽  
Muhammad Ali Bhatti ◽  
Ali Dad Chandio ◽  
Khalida Faryal Almani ◽  
Mazhar Ali Abbasi ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Rhodamine B ◽  
Structural Features ◽  
Considerable Change ◽  
Degradation Efficiency ◽  
Wurtzite Phase ◽  
Doped Zno ◽  
Hexagonal Wurtzite Phase ◽  
Scanning Electron

We have fabricated ZnO nano rods by hydrothermal method and successively doped them with tin (Sn) using different concentrations of 25, 50, 75 and 100 mg of tin chloride. XRD of the fabricated structures showed that ZnO possess hexagonal wurtzite phase. Scanning electron microscopy (SEM) was used to explore the morphology and it shows nanorod like morphology for all samples and no considerable change in the structural features were found. The dimension of nanorod is 200 to 300 nm. The doped materials were then investigated for their photo catalytic degradation of environmental pollutant Rhodamine B. The performance of doped ZnO is compared with the pristine ZnO. Scanning electron microscopy (SEM) was used to explore the morphology and it shows nanorod like morphology for all samples and no considerable change in the structural features were found. The dimension of nanorod is 200 to 300 nm. XRD of the fabricated structures showed that ZnO possess hexagonal wurtzite phase. Photo catalytic activity of rhodamine B was investigated under UV light and a maximum degradation efficiency of 85% was obtained. The optical property reveals the reduction in band gap of upto 17.14% for 100 mg Sn doped ZnO. The degradation is followed by the pseudo order kinetics. The produced results are unique in terms of facile synthesis of Sn doped ZnO and excellent photo degradation efficiency, therefore these materials can be used for other environmental applications.

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