ahmed awol | Jimma University, Ethiopia (original) (raw)
Papers by ahmed awol
ACS Omega
Nanotechnology research is emerging as cutting-edge technology, and nanoparticles (NPs) and nanoc... more Nanotechnology research is emerging as cutting-edge technology, and nanoparticles (NPs) and nanocomposites (NCs) have played a significant role in the bioremediation and treatment of polluted water by organic and nonorganic materials. Nanoparticles produced by plant extracts are more stable and biocompatible in comparison with those produced by physical and chemical methods. This research focuses on the synthesis of NiO NPs and Cu−NiO NCs using Phytolacca dodecandra L'Herit (P.d) leaf extract and evaluation of their antioxidant and photocatalytic activities. Cu−NiO NCs were synthesized using 50 mL of 0.1 M nickel(II) nitrate hexahydrate, 10 mL of 0.1 M copper(II) nitrate trihydrate, and 20 mL of leaf extract. The synthesized nanoparticles were characterized by UV−vis, X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM) analyses to study the energy band gap, average crystallite size, functional groups, and morphology of the samples, respectively. The UV−vis analysis showed a red shift after copper doping, indicating a decrease in the optical band gap values. FT-IR characterization confirms the presence of various functional groups in samples. Crystallite sizes of the formed particles were obtained to be 14.18 and 16.10 nm from the XRD data for NiO NPs and Cu−NiO NCs, respectively. SEM showed the crystallinity of particles with a cubic structure. The photocatalytic degradation of methylene blue (MB) was found to be 78.3 and 97.8% by NiO NPs and Cu−NiO NCs, respectively. In the antioxidant test, NiO NPs and Cu−NiO NCs prevented the oxidation of 50% of the H 2 O 2 molecules at a concentration of 363.96 and 350.29 μg/mL, respectively. Finally, the synthesized samples showed good photocatalytic and antioxidant activities.
30/11/2016 Degree programme Author Zekir Ahmed Awol Group or year of entry 2011 Title of report A... more 30/11/2016 Degree programme Author Zekir Ahmed Awol Group or year of entry 2011 Title of report Android Application development for importing Vehicles to Ethiopia Tracking system Number of pages and appendices 26 + 12 supervisor Hinkula Juha Mobile Application have become common in many business sector in the last few decades. The two giant application stores are Google play for Android device platform and Apple store for iOS, others such as Amazon App store, BlackBerry world, windows phone store and Samsung Apps are some sort of distribution platform for mobile device. In many companies, for instance, to serve their customers easily they developed their own application. The purpose of this thesis was to develop Android mobile Application that assist in Tracking vehicle arrival status for Dry Port Service Enterprise in Ethiopia. The thesis has been done not only Front-End which is the application development but also database design and connection of the Back-End or server side. The...
Nanotechnology research is emerging as cutting-edge technology, and nanoparticles (NPs) and nanoc... more Nanotechnology research is emerging as cutting-edge technology, and nanoparticles (NPs) and nanocomposites (NCs) have played a significant role in the bioremediation and treatment of polluted water by organic and nonorganic materials. Nanoparticles produced by plant extracts are more stable and biocompatible in comparison with those produced by physical and chemical methods. This research focuses on the synthesis of NiO NPs and Cu−NiO NCs using Phytolacca dodecandra L'Herit (P.d) leaf extract and evaluation of their antioxidant and photocatalytic activities. Cu−NiO NCs were synthesized using 50 mL of 0.1 M nickel(II) nitrate hexahydrate, 10 mL of 0.1 M copper(II) nitrate trihydrate, and 20 mL of leaf extract. The synthesized nanoparticles were characterized by UV−vis, X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM) analyses to study the energy band gap, average crystallite size, functional groups, and morphology of the samples, respectively. The UV−vis analysis showed a red shift after copper doping, indicating a decrease in the optical band gap values. FT-IR characterization confirms the presence of various functional groups in samples. Crystallite sizes of the formed particles were obtained to be 14.18 and 16.10 nm from the XRD data for NiO NPs and Cu−NiO NCs, respectively. SEM showed the crystallinity of particles with a cubic structure. The photocatalytic degradation of methylene blue (MB) was found to be 78.3 and 97.8% by NiO NPs and Cu−NiO NCs, respectively. In the antioxidant test, NiO NPs and Cu−NiO NCs prevented the oxidation of 50% of the H 2 O 2 molecules at a concentration of 363.96 and 350.29 μg/mL, respectively. Finally, the synthesized samples showed good photocatalytic and antioxidant activities.
Due to their applications in cosmetology, medicine, antibacterial and other fields, zinc oxide na... more Due to their applications in cosmetology, medicine, antibacterial and other fields, zinc oxide nanoparticles (ZnO-NPs) are among the nanoscale materials experiencing exponential growth. In contrast, pure ZnO-NPs have been reported to have a very large energy bandgap, a large exaction binding energy, electron-hole recombination, no visible light absorption, and poor photocatalytic activities, which limit their potential uses. ZnO-NPs can be further extended through the incorporation of trace amounts of carbon materials to engulf these problems. We investigate the photocatalytic degradation of methylene blue (MB) dye with pure ZnO-NPs infused with a limited amount of carbon dot (C-dot) materials. Consequently, adding 10% C-dot to ZnO-NPs reduced their energy bandgap from 3.1 to 2.8 eV and significantly increased their photocatalytic activity. MB was almost completely degraded (98.4%) after 60 min when 50 mg of C-dot-incorporated ZnO-NPs were added. By comparison, the nanocomposite's photocatalytic activity exceeded that of pure ZnO-NPs by more than 50%. A surface charge and stability improvement are responsible for the extraordinary photocatalytic improvement. As far as we know, this is the best-ever photocatalytic improvement achieved by incorporating a trace amount of C-dot material into pure ZnO-NPs.
Science, Technology and Arts Research Journal, Nov 17, 2014
Article Information Leaves of sweet potato (Ipomoea batatas) grown in Tepi area was studied for t... more Article Information Leaves of sweet potato (Ipomoea batatas) grown in Tepi area was studied for their class of phytochemicals, mineral and proximate composition using standard analytical methods. The phytochemical screening revealed the presence of alkaloids, flavonoid, terpenoids, saponins, quinones, phenol, tannins, amino acid and proteins in the leaves. The proximate composition revealed the presence of ash (13.74±0.54 % dry weight, DW), crude lipid (3.8±0.52%, DW), crude fiber (12.62±0.39%, DW), crude protein (6.37± 0.13%, DW) and carbohydrate (69.62±0.69%). The minerals composition revealed potassium (3608.854mg/100g), sodium (32.079±0.12mg/100g), calcium (320.125±0.36 mg/100g), magnesium (118.75±0.02mg /100g), copper (1.828±0.11mg/100g), zinc (5.647±0.14mg/100g), iron (73.881±0.03mg/100g) and manganese (9.590±0.06mg/100g). These results revealed that the leaves of sweet potato (Ipomoea batatas) contained essential nutrients which compare favorably well with those of wild edible leaves in literatures.
umu.diva-portal.org
We have done this work by the involvement of many friends and people around us in different ways.... more We have done this work by the involvement of many friends and people around us in different ways. So, we would like to extend our heartfelt thanks for all positive impacts and touches from relatives and friends in USBE, in Umeå and throughout the world for standing in our side ...
Organic reactions are typically carried out in the presence of solvents. Isolation of the pure pr... more Organic reactions are typically carried out in the presence of solvents. Isolation of the pure products requires separation and purification steps, which result in a substantial decrease in yield and can be environmentally hazardous processes. A simple and efficient way to increase yields and reduce environmental impact is to conduct the reaction in the absence of solvent, which includes solvent free or solid-state reactions. Solvent-free organic reactions have drawn great interest, particularly from the viewpoint of green chemistry, and environmentally friendly solvent-free reactions have been investigated widely. Due to enormous advantages of solvent free reactions, various solvent free approaches are being discovered for ecofriendly synthesis of many compounds. Metal oxide nanoparticles in the form of nanocatalyst have emerged as viable alternatives to conventional materials in various fields of chemistry and attracted marvelous interest of chemists. This is because the activity ...
Science, Technology and Arts Research Journal, 2014
Article Information Leaves of sweet potato (Ipomoea batatas) grown in Tepi area was studied for t... more Article Information Leaves of sweet potato (Ipomoea batatas) grown in Tepi area was studied for their class of phytochemicals, mineral and proximate composition using standard analytical methods. The phytochemical screening revealed the presence of alkaloids, flavonoid, terpenoids, saponins, quinones, phenol, tannins, amino acid and proteins in the leaves. The proximate composition revealed the presence of ash (13.74±0.54 % dry weight, DW), crude lipid (3.8±0.52%, DW), crude fiber (12.62±0.39%, DW), crude protein (6.37± 0.13%, DW) and carbohydrate (69.62±0.69%). The minerals composition revealed potassium (3608.854mg/100g), sodium (32.079±0.12mg/100g), calcium (320.125±0.36 mg/100g), magnesium (118.75±0.02mg /100g), copper (1.828±0.11mg/100g), zinc (5.647±0.14mg/100g), iron (73.881±0.03mg/100g) and manganese (9.590±0.06mg/100g). These results revealed that the leaves of sweet potato (Ipomoea batatas) contained essential nutrients which compare favorably well with those of wild edible leaves in literatures.
American Scientific Research Journal For Engineering Technology and Sciences, Mar 4, 2015
Bamboo shoots grown in Masha area, Ethiopia were studied for nutrient, mineral and bioactive comp... more Bamboo shoots grown in Masha area, Ethiopia were studied for nutrient, mineral and bioactive compositions using standard analytical methods. The nutrient composition involves the Moisture content 2.98%, Ash content 14.41%, crude lipid 2.25%, crude fiber 18.81%, crude protein 8.04%, and Carbohydrate 73.14%. Besides to this, the mineral composition of bamboo shoots were potassium 6324.101mg/100g), sodium 19.164mg/100g, calcium 60.449mg/100g, magnesium 118.75mg/100g, copper 1.429mg/100g, zinc 5.647mg/100g, iron 13.594mg/100g and manganese 2.895mg/100g. The bioactive constituent analysis revealed the presence of saponins, flavonids, alkanoids, terpenoids, quinons, tannins and phenols. In the present study, bamboo shoots contained essential nutrients which compare favorably well with those of wild edible leaves in literatures.
ACS Omega
Nanotechnology research is emerging as cutting-edge technology, and nanoparticles (NPs) and nanoc... more Nanotechnology research is emerging as cutting-edge technology, and nanoparticles (NPs) and nanocomposites (NCs) have played a significant role in the bioremediation and treatment of polluted water by organic and nonorganic materials. Nanoparticles produced by plant extracts are more stable and biocompatible in comparison with those produced by physical and chemical methods. This research focuses on the synthesis of NiO NPs and Cu−NiO NCs using Phytolacca dodecandra L'Herit (P.d) leaf extract and evaluation of their antioxidant and photocatalytic activities. Cu−NiO NCs were synthesized using 50 mL of 0.1 M nickel(II) nitrate hexahydrate, 10 mL of 0.1 M copper(II) nitrate trihydrate, and 20 mL of leaf extract. The synthesized nanoparticles were characterized by UV−vis, X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM) analyses to study the energy band gap, average crystallite size, functional groups, and morphology of the samples, respectively. The UV−vis analysis showed a red shift after copper doping, indicating a decrease in the optical band gap values. FT-IR characterization confirms the presence of various functional groups in samples. Crystallite sizes of the formed particles were obtained to be 14.18 and 16.10 nm from the XRD data for NiO NPs and Cu−NiO NCs, respectively. SEM showed the crystallinity of particles with a cubic structure. The photocatalytic degradation of methylene blue (MB) was found to be 78.3 and 97.8% by NiO NPs and Cu−NiO NCs, respectively. In the antioxidant test, NiO NPs and Cu−NiO NCs prevented the oxidation of 50% of the H 2 O 2 molecules at a concentration of 363.96 and 350.29 μg/mL, respectively. Finally, the synthesized samples showed good photocatalytic and antioxidant activities.
30/11/2016 Degree programme Author Zekir Ahmed Awol Group or year of entry 2011 Title of report A... more 30/11/2016 Degree programme Author Zekir Ahmed Awol Group or year of entry 2011 Title of report Android Application development for importing Vehicles to Ethiopia Tracking system Number of pages and appendices 26 + 12 supervisor Hinkula Juha Mobile Application have become common in many business sector in the last few decades. The two giant application stores are Google play for Android device platform and Apple store for iOS, others such as Amazon App store, BlackBerry world, windows phone store and Samsung Apps are some sort of distribution platform for mobile device. In many companies, for instance, to serve their customers easily they developed their own application. The purpose of this thesis was to develop Android mobile Application that assist in Tracking vehicle arrival status for Dry Port Service Enterprise in Ethiopia. The thesis has been done not only Front-End which is the application development but also database design and connection of the Back-End or server side. The...
Nanotechnology research is emerging as cutting-edge technology, and nanoparticles (NPs) and nanoc... more Nanotechnology research is emerging as cutting-edge technology, and nanoparticles (NPs) and nanocomposites (NCs) have played a significant role in the bioremediation and treatment of polluted water by organic and nonorganic materials. Nanoparticles produced by plant extracts are more stable and biocompatible in comparison with those produced by physical and chemical methods. This research focuses on the synthesis of NiO NPs and Cu−NiO NCs using Phytolacca dodecandra L'Herit (P.d) leaf extract and evaluation of their antioxidant and photocatalytic activities. Cu−NiO NCs were synthesized using 50 mL of 0.1 M nickel(II) nitrate hexahydrate, 10 mL of 0.1 M copper(II) nitrate trihydrate, and 20 mL of leaf extract. The synthesized nanoparticles were characterized by UV−vis, X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM) analyses to study the energy band gap, average crystallite size, functional groups, and morphology of the samples, respectively. The UV−vis analysis showed a red shift after copper doping, indicating a decrease in the optical band gap values. FT-IR characterization confirms the presence of various functional groups in samples. Crystallite sizes of the formed particles were obtained to be 14.18 and 16.10 nm from the XRD data for NiO NPs and Cu−NiO NCs, respectively. SEM showed the crystallinity of particles with a cubic structure. The photocatalytic degradation of methylene blue (MB) was found to be 78.3 and 97.8% by NiO NPs and Cu−NiO NCs, respectively. In the antioxidant test, NiO NPs and Cu−NiO NCs prevented the oxidation of 50% of the H 2 O 2 molecules at a concentration of 363.96 and 350.29 μg/mL, respectively. Finally, the synthesized samples showed good photocatalytic and antioxidant activities.
Due to their applications in cosmetology, medicine, antibacterial and other fields, zinc oxide na... more Due to their applications in cosmetology, medicine, antibacterial and other fields, zinc oxide nanoparticles (ZnO-NPs) are among the nanoscale materials experiencing exponential growth. In contrast, pure ZnO-NPs have been reported to have a very large energy bandgap, a large exaction binding energy, electron-hole recombination, no visible light absorption, and poor photocatalytic activities, which limit their potential uses. ZnO-NPs can be further extended through the incorporation of trace amounts of carbon materials to engulf these problems. We investigate the photocatalytic degradation of methylene blue (MB) dye with pure ZnO-NPs infused with a limited amount of carbon dot (C-dot) materials. Consequently, adding 10% C-dot to ZnO-NPs reduced their energy bandgap from 3.1 to 2.8 eV and significantly increased their photocatalytic activity. MB was almost completely degraded (98.4%) after 60 min when 50 mg of C-dot-incorporated ZnO-NPs were added. By comparison, the nanocomposite's photocatalytic activity exceeded that of pure ZnO-NPs by more than 50%. A surface charge and stability improvement are responsible for the extraordinary photocatalytic improvement. As far as we know, this is the best-ever photocatalytic improvement achieved by incorporating a trace amount of C-dot material into pure ZnO-NPs.
Science, Technology and Arts Research Journal, Nov 17, 2014
Article Information Leaves of sweet potato (Ipomoea batatas) grown in Tepi area was studied for t... more Article Information Leaves of sweet potato (Ipomoea batatas) grown in Tepi area was studied for their class of phytochemicals, mineral and proximate composition using standard analytical methods. The phytochemical screening revealed the presence of alkaloids, flavonoid, terpenoids, saponins, quinones, phenol, tannins, amino acid and proteins in the leaves. The proximate composition revealed the presence of ash (13.74±0.54 % dry weight, DW), crude lipid (3.8±0.52%, DW), crude fiber (12.62±0.39%, DW), crude protein (6.37± 0.13%, DW) and carbohydrate (69.62±0.69%). The minerals composition revealed potassium (3608.854mg/100g), sodium (32.079±0.12mg/100g), calcium (320.125±0.36 mg/100g), magnesium (118.75±0.02mg /100g), copper (1.828±0.11mg/100g), zinc (5.647±0.14mg/100g), iron (73.881±0.03mg/100g) and manganese (9.590±0.06mg/100g). These results revealed that the leaves of sweet potato (Ipomoea batatas) contained essential nutrients which compare favorably well with those of wild edible leaves in literatures.
umu.diva-portal.org
We have done this work by the involvement of many friends and people around us in different ways.... more We have done this work by the involvement of many friends and people around us in different ways. So, we would like to extend our heartfelt thanks for all positive impacts and touches from relatives and friends in USBE, in Umeå and throughout the world for standing in our side ...
Organic reactions are typically carried out in the presence of solvents. Isolation of the pure pr... more Organic reactions are typically carried out in the presence of solvents. Isolation of the pure products requires separation and purification steps, which result in a substantial decrease in yield and can be environmentally hazardous processes. A simple and efficient way to increase yields and reduce environmental impact is to conduct the reaction in the absence of solvent, which includes solvent free or solid-state reactions. Solvent-free organic reactions have drawn great interest, particularly from the viewpoint of green chemistry, and environmentally friendly solvent-free reactions have been investigated widely. Due to enormous advantages of solvent free reactions, various solvent free approaches are being discovered for ecofriendly synthesis of many compounds. Metal oxide nanoparticles in the form of nanocatalyst have emerged as viable alternatives to conventional materials in various fields of chemistry and attracted marvelous interest of chemists. This is because the activity ...
Science, Technology and Arts Research Journal, 2014
Article Information Leaves of sweet potato (Ipomoea batatas) grown in Tepi area was studied for t... more Article Information Leaves of sweet potato (Ipomoea batatas) grown in Tepi area was studied for their class of phytochemicals, mineral and proximate composition using standard analytical methods. The phytochemical screening revealed the presence of alkaloids, flavonoid, terpenoids, saponins, quinones, phenol, tannins, amino acid and proteins in the leaves. The proximate composition revealed the presence of ash (13.74±0.54 % dry weight, DW), crude lipid (3.8±0.52%, DW), crude fiber (12.62±0.39%, DW), crude protein (6.37± 0.13%, DW) and carbohydrate (69.62±0.69%). The minerals composition revealed potassium (3608.854mg/100g), sodium (32.079±0.12mg/100g), calcium (320.125±0.36 mg/100g), magnesium (118.75±0.02mg /100g), copper (1.828±0.11mg/100g), zinc (5.647±0.14mg/100g), iron (73.881±0.03mg/100g) and manganese (9.590±0.06mg/100g). These results revealed that the leaves of sweet potato (Ipomoea batatas) contained essential nutrients which compare favorably well with those of wild edible leaves in literatures.
American Scientific Research Journal For Engineering Technology and Sciences, Mar 4, 2015
Bamboo shoots grown in Masha area, Ethiopia were studied for nutrient, mineral and bioactive comp... more Bamboo shoots grown in Masha area, Ethiopia were studied for nutrient, mineral and bioactive compositions using standard analytical methods. The nutrient composition involves the Moisture content 2.98%, Ash content 14.41%, crude lipid 2.25%, crude fiber 18.81%, crude protein 8.04%, and Carbohydrate 73.14%. Besides to this, the mineral composition of bamboo shoots were potassium 6324.101mg/100g), sodium 19.164mg/100g, calcium 60.449mg/100g, magnesium 118.75mg/100g, copper 1.429mg/100g, zinc 5.647mg/100g, iron 13.594mg/100g and manganese 2.895mg/100g. The bioactive constituent analysis revealed the presence of saponins, flavonids, alkanoids, terpenoids, quinons, tannins and phenols. In the present study, bamboo shoots contained essential nutrients which compare favorably well with those of wild edible leaves in literatures.