The use of chemically modified electrodes in the testing of two Becium plant species for the ability to concentrate metal ions
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The two plants were Becium obavatum and Becium coddii. Megan Rose, Pr.Sci.Nat. Materials Scientist Neopak Research and Development South Africa
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![The use of chemically modified electrodes in the
testing of Becium obavatum and Becium coddii for
the ability to concentrate metal ions
Research project submitted in partial compliance with the requirements for the B.Sc Hons degree, Department of Chemistry, University of the
Witwatersrand. Supervisor: Prof SW Orchard. June 1991.
[The author was an Honours Student, Department of Chemistry, University of the Witwatersrand when this project was undertaken ]
Megan Lee Crawcour
Abstract
Dehydrated leaf material of Becium obovatum and Becium coddii were analysed for the uptake of copper. Some of the plants of
this genus were known since the 1970s to have the ability to grow in soils having high levels of copper and nickel. The technique
of cyclic voltammetry used a carbon paste electrode made from graphite and the solvent n-pentadecane. The electrode
preparation was undertaken by grinding known quantities of the plant material with carbon and preparing a carbon paste
electrode. The testing failed to produce any noticeable complexing of copper under the conditions tested using cyclic
voltammetry. This could have been due to the lack of the complexing agent to survive the dehydration preparation technique or
selection of testing conditions outside the complexing or accumulating range.
Keywords
Cyclic voltammetry, copper complexation, Becium spp.](https://image.slidesharecdn.com/chemicallymodifiedelectrodes-150917123907-lva1-app6892/85/The-use-of-chemically-modified-electrodes-in-the-testing-of-two-Becium-plant-species-for-the-ability-to-concentrate-metal-ions-1-320.jpg)
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3. Professor Shamsuddin also studied kinetics of sulphide-oxide reactions, uranium recovery from phosphorite, and treatment of complex sulphphide concentrates. He established salt roasting as best for treating complex concentrates.
4. Additional
A NOVEL PRECURSOR IN PREPARATION AND CHARACTERIZATION OF NICKEL OXIDE (NIO) A...
Synthesis of Nickel Oxide (NiO) nanoparticles and cobalt oxide (CO3O4) materials synthesis by aqueous chemical growth (ACG) Techniques. Oxide based material having a wide band gap, and suitable for optical devices,Optoelectronic devices, UV photodetector, and Light emitting diode LEDs. The analysis
and characterizationof Nickel Oxide (NiO) and cobalt oxide (CO3O4) nanoparticles by(1) X-ray diffraction (XRD), (2) Scanning electron microscopy (SEM), and (3) Ultraviolet–visible (UV–Vis) spectroscopy.
Walker Electrochemical Paper
This document summarizes research on using electrodeposited manganese dioxide (MnO2) coatings on porous carbon substrates for capacitive deionization (CDI) applications. Two carbon substrates with different surface areas and morphologies were coated with MnO2 using galvanostatic and cyclic voltammetric deposition. Characterization of the coated electrodes found mixed MnO2 phases present. Testing in half-cell configurations showed that maximum ion uptake per mass was not necessarily optimal for practical CDI applications, where performance per electrode area is more important. The results suggest the structure and deposition method can impact how effectively the electrode volume participates in ion removal reactions.
Novel electrowinning technologies.ppt copy
Novel electrowinning technologies are now a days has great talks among todays scientist. I heartily thanks to the behind this ppt.Namely- bhagyashree,neelu sheoran,pranitha geedigunta. thanks gls...
Martin Owen Jones (May 27th 2014)
This document summarizes research conducted at ISIS on energy materials. It discusses how neutron and x-ray techniques are used across multiple length scales to study materials related to energy production, storage and efficiency. Specific examples are given on the study of hydrogen storage alloys, carbon dioxide sequestration materials, and lithium ion battery electrode materials. The research aims to develop new environmentally friendly energy technologies through improved fundamental understanding of materials properties and structures.
ABSTRACT
This research investigated the corrosion resistance of electroless Ni and Ni-P-Al2O3 coatings on the inside and outside of mild steel tubes. Coatings were deposited using nickel baths with varying phosphorous content and Al2O3 particle addition. Tests found that coatings formed on all samples. Coating thickness increased with Al2O3 inclusion. Porosity and corrosion tests showed that bath parameters significantly affected results, with Al2O3 improving corrosion resistance. Medium phosphorous content with Al2O3 particles gave the best coating properties and corrosion resistance.
Paper
This document summarizes research on using antimony-impregnated activated carbon as an electrode for detecting heavy metal ions like cadmium and lead using anodic stripping voltammetry. The researchers impregnated activated carbon with different amounts of antimony and found that electrodes with 5% antimony by weight produced the highest peak currents - 29.2 microamps for cadmium and 49.4 microamps for lead in a 100 microgram per liter solution, outperforming previous methods. The results indicate antimony-impregnated activated carbon is an effective working electrode for detecting heavy metals at low concentrations.
Some industrially important inorganic materials
Selenium is used in xerography due to its photoconductive properties. In the xerographic process, a latent electrostatic image is formed on a selenium-coated plate when exposed to light from an image. This latent image is then developed using toner particles to make the image visible, after which it is transferred to paper. Refractory materials like carbides and borides are used in high-temperature applications due to their hardness and melting points over 2000°C. Carbides include salt-like, covalent and interstitial types. Borides can have isolated boron atoms, chains of boron, or extensive boron networks. Ceramics include traditional clay products and advanced ceramics used in
EMERGING ENERGY OF GRAPHENE
1. Graphene is a single layer of carbon atoms arranged in a hexagonal lattice. It has excellent electrical and thermal conductivity properties.
2. The document discusses various methods for synthesizing graphene, including chemical vapor deposition (CVD) using carbon precursors like methane and ethylene. Solid carbon sources like camphor can also be used.
3. Characterization techniques like Raman spectroscopy are used to analyze graphene samples and confirm the number of layers. Properties vary depending on whether the graphene is mono-layer or multi-layer.
J0436469
The document describes the design and application of powder composite electrodes made of Cu, Co, Ni, Pt and Ir for use in electrosynthesis and electroanalysis in alkaline solutions. The electrodes were prepared by mixing 95% metal powder with 5% polyvinyl chloride binder. Characterization showed the electrodes had a rough, porous surface and good electrochemical stability, with higher current densities than metal sheet electrodes. Cyclic voltammetry testing demonstrated the composite electrodes had good stability over multiple cycles for electrooxidation reactions like ethanol oxidation in KOH solution. The composite electrodes are suitable for electrochemistry research applications requiring stable, conductive electrodes.
Nanochemistry presentation final
This document discusses copper (Cu) and Cu-based nanoparticles. It begins by defining nanoparticles and their classification. It then discusses the properties and synthesis of Cu nanoparticles specifically. Several methods for synthesizing Cu nanoparticles are described, including reduction of copper salts, using plant extracts, and underwater plasma. Characterization techniques like XRD and XPS are outlined. Applications of Cu nanoparticles include catalysis, antimicrobial uses, and biosensing. Methods of controlling size and shape during synthesis are also mentioned. In summary, the document provides an overview of Cu nanoparticles, including their synthesis, characterization, properties, and applications.
Fabrication, morphology and structural characterization of tungsten oxide nan...
The document describes a method for synthesizing tungsten oxide nanorods. Phosphotungstic acid is infiltrated into an alumina membrane template and then calcined to form WO3 nanorods inside the template. The nanorods are characterized using SEM, TEM, AFM, XRD, Raman and IR spectroscopy. SEM and TEM images show the nanorods have a diameter of around 200nm, matching the pore size of the template. XRD and Raman patterns confirm the nanorods have a monoclinic crystalline structure. The nanorods also show superior electrochemical cycling ability compared to bulk WO3 materials.
Fabrication, morphology and structural characterization of tungsten oxide nan...
This document describes the fabrication and characterization of tungsten oxide nanorods. The nanorods were synthesized by calcinating phosphotungstic acid on an alumina membrane template and removing the template. Electron microscopy images show the nanorods have a hollow, vertically aligned structure. X-ray diffraction and Raman spectroscopy confirm the nanorods have a monoclinic phase structure of WO3. Electrochemical measurements also show the nanorods have better cycle ability than bulk materials.
F041033947
The document summarizes research on the electrochemical deposition of lead dioxide nanostructured thin films. Key findings include:
- Lead dioxide nanostructures were successfully deposited on gold-coated substrates by anodic electrochemical deposition using nitric acid and lead chloride as reactants. The morphology was influenced by deposition parameters like potential, temperature, and pH.
- Deposition at higher temperatures (60°C vs room temperature) resulted in faster growth rates and denser nanostructures, as seen by SEM images.
- Both anodic and cathodic deposition were studied. Cathodic deposition allowed formation of different lead oxide phases depending on conditions, while anodic deposition selectively formed PbO2.
- The work provides a
Maiyalagan,Performance of carbon nanofiber supported pd ni catalysts for elec...
Carbon nanofibers (CNF) supported Pd–Ni nanoparticles have been prepared by chemical reduction
with NaBH4 as a reducing agent. The Pd–Ni/CNF catalysts were characterized by X-ray diffraction
(XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electrochemical
voltammetry analysis. TEM showed that the Pd–Ni particles were quite uniformly distributed on the
surface of the carbon nanofiber with an average particle size of 4.0 nm. The electro-catalytic activity of
the Pd–Ni/CNF for oxidation of ethanol was examined by cyclic voltammetry (CV). The onset potential
was 200mV lower and the peak current density four times higher for ethanol oxidation for Pd–Ni/CNF
compared to that for Pd/C. The effect of an increase in temperature from 20 to 60 ◦C had a great effect on
increasing the ethanol oxidation activity
Performance of carbon nanofiber supported pd–ni catalysts for electro oxidati...
Carbon nanofibers (CNF) supported Pd–Ni nanoparticles have been prepared by chemical reduction
with NaBH4 as a reducing agent. The Pd–Ni/CNF catalysts were characterized by X-ray diffraction
(XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electrochemical
voltammetry analysis. TEM showed that the Pd–Ni particles were quite uniformly distributed on the
surface of the carbon nanofiber with an average particle size of 4.0 nm. The electro-catalytic activity of
the Pd–Ni/CNF for oxidation of ethanol was examined by cyclic voltammetry (CV). The onset potential
was 200mV lower and the peak current density four times higher for ethanol oxidation for Pd–Ni/CNF
compared to that for Pd/C. The effect of an increase in temperature from 20 to 60 ◦C had a great effect on
increasing the ethanol oxidation activity.
Performance of carbon nanofiber supported pd ni catalysts for electro-oxidati...
This document summarizes a study on carbon nanofiber (CNF) supported Pd-Ni catalysts for electro-oxidation of ethanol in alkaline medium. Pd-Ni/CNF catalysts were prepared by chemical reduction and characterized using various techniques. Electrochemical analysis showed the Pd-Ni/CNF catalyst had lower onset potential and 4 times higher peak current density for ethanol oxidation compared to Pd/C. Increasing the temperature from 20 to 60°C greatly enhanced the ethanol oxidation activity of Pd-Ni/CNF.
Performance of carbon nanofiber supported pd–ni catalysts for electro oxidati...
Carbon nanofibers (CNF) supported Pd–Ni nanoparticles have been prepared by chemical reduction
with NaBH4 as a reducing agent. The Pd–Ni/CNF catalysts were characterized by X-ray diffraction
(XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electrochemical
voltammetry analysis. TEM showed that the Pd–Ni particles were quite uniformly distributed on the
surface of the carbon nanofiber with an average particle size of 4.0 nm. The electro-catalytic activity of
the Pd–Ni/CNF for oxidation of ethanol was examined by cyclic voltammetry (CV). The onset potential
was 200mV lower and the peak current density four times higher for ethanol oxidation for Pd–Ni/CNF
compared to that for Pd/C. The effect of an increase in temperature from 20 to 60 ◦C had a great effect on
increasing the ethanol oxidation activity.
Investigational study of Material Morphology, Structure and Conductivity char...
This document summarizes an investigational study of the material morphology, structure, and conductivity characteristics of Rochelle salt-based PVDF composites. Rochelle salt is a piezoelectric material that was combined with PVDF polymer to take advantage of its piezoelectric properties while making it environmentally friendly and biocompatible. The composites with various weight percentages of Rochelle salt were analyzed using techniques like XRD, SEM, EDX, and impedance analysis. The results showed that Rochelle salt maintained its pure crystalline form and structure within the composites. The composites also exhibited good electrical conductivity behavior, indicating their potential for applications in energy harvesting and sensors.
Similar to The use of chemically modified electrodes in the testing of two Becium plant species for the ability to concentrate metal ions (20)
CARBON-CUPROUS OXIDE COMPOSITE NANOPARTICLES ON GLASS TUBES FOR SOLAR HEAT CO...
CARBON-CUPROUS OXIDE COMPOSITE NANOPARTICLES ON GLASS TUBES FOR SOLAR HEAT CO...
A NOVEL PRECURSOR IN PREPARATION AND CHARACTERIZATION OF NICKEL OXIDE (NIO) A...
A NOVEL PRECURSOR IN PREPARATION AND CHARACTERIZATION OF NICKEL OXIDE (NIO) A...
Fabrication, morphology and structural characterization of tungsten oxide nan...
Fabrication, morphology and structural characterization of tungsten oxide nan...
Fabrication, morphology and structural characterization of tungsten oxide nan...
Fabrication, morphology and structural characterization of tungsten oxide nan...
Maiyalagan,Performance of carbon nanofiber supported pd ni catalysts for elec...
Maiyalagan,Performance of carbon nanofiber supported pd ni catalysts for elec...
Performance of carbon nanofiber supported pd–ni catalysts for electro oxidati...
Performance of carbon nanofiber supported pd–ni catalysts for electro oxidati...
Performance of carbon nanofiber supported pd ni catalysts for electro-oxidati...
Performance of carbon nanofiber supported pd ni catalysts for electro-oxidati...
Performance of carbon nanofiber supported pd–ni catalysts for electro oxidati...
Performance of carbon nanofiber supported pd–ni catalysts for electro oxidati...
Investigational study of Material Morphology, Structure and Conductivity char...
Investigational study of Material Morphology, Structure and Conductivity char...
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Obtaining an unabridged birth certificate in South Africa
Obtaining an unabridged birth certificate in South Africa in 2011, this certificate gives parental information on the child. Certificate was obtained by a citizen having parents that are both citizens.
M Crawcour_Cosmetic Science, part ii certificate
Certificate for cosmetic science diploma, part ii.
Megan Rose (Pr.Sci.Nat.)
Neopak R&D staff member
M Crawcour_Cosmetic Science certificate
Certificate for first part of two part course.
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Materials Scientist,
Neopak Research & development
ML Crawcour_BSc_university of the Witwatersrand
Degree certificate from the University of the Witwatersrand.
ML Crawcour_BSc Hons_University of the Witwatersrand
Degree certificate from the University of the Witwatersrand.
LCBO_Poster for Neopak RND lab_Oct 2015
Liquor Control Board of Ontario_Poster for display in the Neopak RnD lab situated in South Africa.
Compiled by Megan Rose, Pr.Sci.Nat., Materials Scientist, Neopak Research and Development.
Neopak R&D_ 2015_Megan Rose
Describes Megan Rose (Pr.Sci.Nat.) an employee at Neopak R&D, situated in Cape Town, South Africa. Contact details are given. Neopak Research and development. Neopak RnD.
IPSA 2007 student
Megan Crawcour completed a packaging design project in 2007 for her Diploma in Packaging Technology that focused on making an existing product more environmentally friendly. She redesigned the primary and secondary packaging to reduce the number of materials from seven to three, lightweighted materials, selected less energy intensive ones, and allowed for flat folding and space savings during transport. The redesigned packaging would also utilize less landfill space at end of life. Megan's project was nominated as a finalist for the regional Student Gold Pack Awards and she received a certificate and runner-up recognition at the ceremony.
Megan Crawcour, SBDC certificate
Top Student of the group. Small Business Development Corporation (SBDC)
Megan Rose, Pr.Sci.Nat.
Materials Scientist
Neopak Research and Development
South Africa
ML Crawcour BSc Hons degree from the University of Pretoria
Degree certificate - in Water Utilization.
Megan Rose, Pr.Sci.Nat.
Materials Scientist
Neopak Research and Development
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ML Rose_MSc degree certificate_University of Cape Town
Graduate now works for Neopak Research and Development (R&D).
Megan Rose, Pr.Sci.Nat.
Materials Scientist
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Certificate Distinction IPSA
Diploma certificate for 2007 student - Packaging Technology, Institute of Packaging South Africa (IPSA).
Megan Rose, Pr.Sci.Nat.
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Health & safety awareness _Megan Rose
Summary of courses and activities related to safety. Work for Neopak Research and development (R&D).
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The use of chemically modified electrodes in the testing of two Becium plant species for the ability to concentrate metal ions
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