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Now showing items 1-20 of 100

SYNTHESIS, CHARACTERIZATIONANDPHOTOLUMINESCENCE PROPERTIES OF AgN- CO DOPED CdS NANOPARTICLES

hailu berhe, Shamble; kebede, Tesfahun (Haramaya university, 2015-10)

It was demonstrated in earlier studies that the use of methanol as a solvent leads to a strong enhancement of PL intensity of CdS quantum dot for use in optoelectronic devices. Likewise, the present study makes use of ...
LEVELS OF HEAVY METALS (Pb, Cd, Zn AND Fe) IN FISH (FLESH AND LIVER) FROM LAKE ADELE USING ATOMIC ABSORPTION SPECTROSCOPY

gebru gebremeskel, Teklay; teju, Endale Major Advisor (PhD) (Haramaya university, 2016-01)

T mia fo siht yduts saw ot enimreted eht le lev fo ,dael ,muimdac ir no dna z cni morf sif h selpmas etcelloc d morf L eka Ad .ele hsiF strap we er etcejbus d ot dica gid e noits erudecorp nisu g detartnecnoc a dic fo H ...
SYNTHESIS AND CHARACTERIZATION OF Ag-ZnO/Ag3PO4 NANOCOMPOSITES FOR PHOTOREDUCTION STUDY OF HEXAVALENT CHROMIUM IN AQUEOUS SOLUTION

zinabu bekele, Biruk; taddesse, Abi Major Advisor (PhD) (Haramaya university, 2016-05)

The binary systems of Ag3PO4/ZnO and doped Ag-ZnO/Ag3PO4 nanocomposites were synthesized by a co-precipitation method. The obtained nanocomposites were calcined at 400oC, 500oC, 600o c and 700oC for 3h. The structures, ...
SYNTHESIS, CHARACTERIZATION AND STUDY ON THE SORPTION PROPERTY OF Fe3O4/Al2O3/ZrO2 NANOCOMPOSITES TOWARD THE REMOVAL OF CADMIUM, LEAD AND CHROMIUM IONS FROM AQUEOUS SOLUTION

tsegaye dajan, Fekadu; taddesse, Abi Major Advisor (PhD); teju, Endale Co-Advisor (PhD); diaz, Isabel (prof.) (Haramaya university, 2016-10)

The pollution caused by heavy metals is one of the major environmental problems that is imperative to be solved. Fe-Al-Zr ternary mixed oxides nanocomposite was Synthesized by using ferric chloride hexa hydrate, ferrous ...
SYNTHESIS AND CHARACTERIZATION OF REDUCED GRAPHENE OXIDE SUPPORTED Ag/PANI NANOCOMPOSITE ELECTROCHEMICAL SENSOR FOR THE DETECTION OF SELECTED TOXIC HEAVY METALS

ersumo dobamo, Abayneh; adgo, Abebaw Major Advisor (PhD); taddesse, Abi Co-Advisor (PhD) (Haramaya university, 2016-10)

Reduced graphene oxide supported Ag/PANI nanocomposite electrochemical sensor was synthesized through electrochemical methods from electrochemical polymerization of 0.2M aniline monomer in 1M HCl and electrodeposition ...
CHELATING AGENT FREE SOLID PHASE EXTRACTION (CAF SPE) OF FLUORIDE AND PHOSPHATE BY Fe-Al-Zr TERNARY MIXED OXIDE NANOCOMPOSITE

mano nafako, Mathewos; taddesse, Abi Major Advisor (PhD); teju, Endale Co-Advisor (PhD); diaz, Isabel (prof.) (Haramaya university, 2016-10)

Synthesis of Fe-Al-Zr ternary mixed oxides nanocomposite was performed by using ferric nitrate nona hydrate, aluminum nitrate nona hydrate and zirconium oxide via impregnation method. X-ray diffraction (XRD) and ...
SYNTHESIS, CHARACTRIZATION AND ANTIMICROBIAL SCREENING OF ZnS/CdS/NiS NANOCOMPOSITE PREPARED BY PRECIPITATION METHOD

benti gasisa, Kenno; kebede, Tesfahun Major Advisor (PhD) (Haramaya university, 2016-10)

Nanoparticles of the metal sulfides (ZnS, CdS and NiS) were prepared by precipitation method from the aqueous solution of Na2S. 9H2O using aqueous solutions of their soluble salts Zn (NO3)2.6H2O, Cd(NO3)2.4H2O, Ni(NO3)2.4H2O, ...
LEVELS OF SELECTED HEAVY METALS (Pb, Cd, Zn AND Fe) IN SEDIMENT AND WATER OF LAKE ADELE, HARAMAYA, ETHIOPIA

gebremeskel tadege, Hadush; teju, Endale Major Advisor (PhD) (Haramaya university, 2016-10)

This study focuses on the determination of heavy metal levels in lake water and sediment of Lake Adele using AAS. The heavy metals considered in this study were cadmium, lead, iron and zinc. The water and sediment samples ...
SYNTHESIS AND CHARACTERIZATION OF NANOSTRUCTURED REDUCED GRAPHENE OXIDE/PANI/ZnO ACETYLCHOLINESTRASE BIOSENSOR FOR MALATHION DETECTION

chufamo jikamo, Samuel; adgo, Abebaw Major Advisor (PhD); taddesse, Abi Co-Advisor (PhD) (Haramaya university, 2016-10)

PANI and PANI/ZnO were synthesized electrochemically on both glass carbon electrode and reduced graphene oxide modified glass carbon electrode. PANI, PANI/ZnO and PANI/ZnO/RGO nanocomposites were alsosynthesized by in-situ ...
SYNTHESIS AND CHARACTERIZATION OF Al2O3/Fe3O4/ZrO2 TERNARY NANOCOMPOSITE FOR FLUORIDE AND PHOSPHATE SORPTION FROM AQUEOUS SOLUTION

legese dabessa, Wubishet; teju, Endale Major Advisor (PhD); taddesse, Abi Co-Advisor (PhD); diaz, Isabel (prof.) (Haramaya university, 2016-10)

The fluoride and phosphate adsorption capacity of Fe3O4/Al2O3/ZrO2 ternary oxide synthesized by chemical coprecipitation method was studied because, excess amounts of fluoride and phosphate in water bodies lead to fluorosis ...
SYNTHESIS AND CHARACTERIZATION OF UIO-66 METAL ORGANIC FRAMEWORKS FOR SIMULTANEOUS SORPTION OF METHYL ORANGE AND METHYLENE BLUE FROM AQUEOUS SOLUTION

girma eshetu, Tsegaye; teju, Endale Major Advisor (PhD); taddesse, Abi Co-Advisor (PhD); diaz, Isabel (prof.) Major Advisor (PhD) (Haramaya university, 2016-10)

Various industries like textile, plastic, pulp, and paper produce dye-containing wastewaters that have harmful effects on the environment as well as human health. For this purpose UiO-66 (ZrMOF), adsorbent was prepared ...
SYNTHESIS AND CHARACTERIZATION OF Ag - Ag3PO4 /ZnO NANOCOMPOSITES FOR ANTIMICHROBIAL APPLICATION

hailu tessema, Rahel; taddesse, Abi Major Advisor (PhD) (Haramaya university, 2016-10)

The binary systems of Ag3PO4/ZnO anddoped Ag - Ag3PO4/ZnOnanocomposites were synthesized by a co-precipitation method using aqueous solutions of zinc chloride ( ZnCl2) ,silver nitrate (AgNO3)and dipotassiumhydrogen ...
QUANTITATIVE DETERMINATION OF SELECTED HEAVY METALS FROM THE SEWAGE OF SAINT GEORGE BEER FACTORY IN ADDIS ABABA

gizaw gebeyehu, Solomon; teju, Endale Co-Advisor Dr. (Haramaya university, 2016-10)

This study was conducted to examine the concentrations of selected heavy metals in sewage from St.George Brewery in Addis Ababa, in order to assess the pollution status of the sewage before it joins the nearby water ...
SYNTHESIS AND CHARACTERIZATION OF POLYANILINE SUPPORED CdS-ZnO-Ag3PO4NANOCOMPOSITE FOR PHOTOCATALYTIC AND ANTIMICROBIAL APPLICATIONS

geresu shamana, Gezahegn; taddesse, Abi Major Advisor (PhD); kebede, Tesfahun Co-Advisor (PhD); diaz, Isabel (prof.) (Haramaya university, 2017-01)

In this work, different types of photocatalysts, single systems; ZnO, Ag3PO4,and CdS binary systems; ZnO-Ag3PO4, and ZnO-CdS, and ternary systems with different molar ratio of; CdS-ZnO-Ag3PO4 (15:80:5), CdS-ZnO-Ag3PO4 ...
EVALUATION OF UNIVERSAL EXTRACTANTS FOR THE EXTRACTION OF SELECTED MACRONUTRIENTS FROM SOIL SAMPLES OF EAST HARARGHE AND BAKO, ETHIOPIA

zeleke nurgisa, Shasho; teju, Endale Major Advisor (PhD); taddesse, Abi Co-Advisor (PhD) (Haramaya university, 2017-01)

Evaluation of nutrient status in soil is important for nutritional, environmental, and economical aspects. The objective of this study was to assess the effectiveness of selected universal soil extractants (Mehlich 3, ...
LEVELS OF SELECTED HEAVY METALS IN CEREALS PRODUCED AROUND CHIRO TOWN, WESTERN HARARGHE

tsegaye woyessa, Alemayehu; teju, Endale Major Advisor (PhD); Bogale, Yiheyis Co-Advisor (PhD) (Haramaya university, 2017-05)

The concentrations of heavy metals (Mn, Cr, Pb, Fe and Cd) in different varieties of maize and sorghum samples were determined by using flame atomic absorption spectrometry. Dry ashing method was used to destroy the ...
SYNTHESIS, CHARACTERIZATION, AND PHOTOCATALYTIC ACTIVITY OF Co3O4/ZnO NANOCOMPOSITE FOR PHOTOCATALYTIC DEGRADATION OF CRYSTAL VIOLET UNDER VISIBLE IRRADIATION

asrat negash, Biniam; taddesse, Abi Major Advisor Dr. (Haramaya university, 2017-05)

With an attempt to extend the light absorption towards the visible range and inhibit the rapid recombination of excited electrons/holes, Co3O4/ZnO nanocomposite and single system ZnO and Co3O4 nanoparticle were synthesized ...
SYNTHESIS AND CHARACTRAZATION OF POLYANILINE/TiO2/ GRAPHITE NANOCOMPOSITE FOR SUPERCAPACITOR

shifera weldegrum, Getabalew; adgo, Abebaw Major Advisor (PhD); taddesse, Abi Co-Advisor (PhD) (Haramaya university, 2017-05)

Polyaniline (PANI) and PANI/TiO2 composite was potentio dynamically deposited from solutions of 0.1M aniline /1M HCl and in the presence of 0.04 g TiO2 on bare and graphite (Gr) modified glassy carbon (GC) electrode. ...
CHEMICAL COMPOSITION AND ANTIMICROBIAL ACTIVITY STUDY OF ROOT EXTRACTS OF JUSTICIA SCHIMPERIANA

tafesse eba, Tamene; babu g, Neelaiah Major Advisor (PhD); teju, Endale Co-Advisor (PhD) (Haramaya university, 2017-05)

The present study was carried out on the chemical composition, phytochemical constituents test and antimicrobial activities on the root extracts of Justicia schimperiana plant using Soxhlet extraction method. The powdered ...

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