Volume-12 ~ Issue-8 ~ August-2019

Abstract:：Semiconductor Thin Layers have been successfully synthesized through two-step electrodeposition using three electrodes potensiostatic producing Cu2O-ZnO on FTO glass which is expected to be function as a electrode solar cell. Precursor used is an electrolyte solution which can produce ZnO as an n-type semicondutor and Cu2O as a p-type semiconductor. The synthesized electrode was characterized by X-Ray Diffraction (XRD) to determine the size of crystals and the presence of compounds qualitatively compared with the literature. A thin layer of photocurrent test is performed to find that the thin layer has functioned as a semiconductor.In the application, the photoanode electrode and the carbon counter electrode generate current after irradiation with light energy using solar simulator 100 mWatt/cm2.

Keywords: Two Step Electrodeposition, Photentiostate , Solar Cells

[1]. Lahmar dan Halla , 2017, On the Electrochemical Synthesis and Characterization of P-Cu 2 O / N-ZnO Heterojunction,718: 36–45.
[2]. Ladany,I.,1989,Approaches Toward a Blue Semiconductor Laser,Planning Research Corporation Aerospace Techcologies Division Hampton,Virginia
[3]. Karsthof, R., P. Räcke, H. Von Wenckstern, and M. Grundmann,2016,Semi-Transparent NiO/ZnO UV Photovoltaic Cells, Physica Status Solidi (A) Applications and Materials Science 213(1): 30–37.
[4]. Hong and Vu,2016,Enhanced Electrocatalytic Activity of Electrodeposited F-Doped SnO2 / Cu2S Electrodes for Quantum Dot-Sensitized Solar Cells,Journal of Power Sources 316: 53–59
[5]. Chen, Sujuan., 2015, An Electrochemical Constructed P-Cu2O/n-ZnO Heterojunction for Solar Cell." Journal of Alloys and Compounds 644: 378–82.

Abstract:：The irreplaceable role water plays in human survival makes it pertinent to investigate its physicochemical facets. The study aimed at ascertaining the physicochemical parameters of some water sources in different locations in the three areas that make up Lafia metropolis (Lafia East, LafiaCentral and Lafia North) using standard methods. Sampling was done for boreholes, hand dug wells and streams within the study area. Parameters analyzed in the study include: Chloride (mg/L), Phosphate (mg/L), Sulphate (mg/L), Nitrate (mg/L), Total hardness (mg/L), Total alkalinity (mg/L), Temperature (˚C), pH, TDS (mg/L), Electric Conductivity (μS/cm), Turbidity (NTU) and Odour. Analysis of Variance (ANOVA) was used in analyzing study results andonly differences considered significant at P ≤ 0.05 for each parameter were reported.The findings indicate that chlorides, sulphates.........

Keywords: physicochemical, water samples, Lafia, parameters, standards

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[2]. Adegboyega, A. M., Olalude, C. B., & Odunola, O. A. (2015). Physicochemical and Bacteriological Analysis of Water Samples Used For Domestic Purposes in Idi Ayunre, Oyo State, Southwestern Nigeria. Journal of Applied Chemistry, 8(10), 46-50.
[3]. Agwu, A., & Avoaja, A. (2013). The assessment of drinking water sources in Aba Metropolis, Abia State, Nigeria. Journal of Environmental Resources, 3(4), 72-96.
[4]. Aremu, M., Majabi, G., Oko, J., Opaluwa, O., Gav, B., & Osinfade, B. (2014). Physicochemical Analyses of Different Sources of Drinking Water in Okene Local Government Area of Kogi State, Nigeria. Civil and Environmental Research, 6(5), 143-150.
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Abstract: The non-availability of landfills in urban and sub-urban centres has resulted in many dumpsites in farmlands. Cultivation of crops in and around such refuse dumpsites is a common practice in Nigeria despite the attended health hazards and environmental pollution. In response to this unhealthy practice, comparative analysis of heavy metals such as Cd, Co, Cu, Ni and Pb was undertaken at some selected dumpsites in Nsukka, Nigeria, to determine the level of contamination. Analysis of the results showed that the various metals have their concentrations increased above the control by 0.5 to 5.5 mg/kg for Cd, 8.0 to 74.2 mg/kg for Pb, 5.5 to 15.6 mg/kg for Co, 1.9 to 23.5 mg/kg for Ni and 3.9 to 32.5 mg/kg for Cu. The results also showed that Odenigbo dumpsite has Pb and Cd above WHO maximum allowable. In addition, pH level varied from 4.68 to 4.82 with the control value of 4.48. Crops cultivated in such contaminated soils pose health problems to their consumers. The panacea to this problem amongst other things is provision of landfills, which will encourage proper refuse disposal and treatment.

Keywords: Dumpsites, Heavy metals, Pollution, Soil, Crops

[1]. Kabir E., Kim S., Yoon H. O., Jeon E. C., Kim Y. S., Cho Y. S., Yun S. T., Brown R. J., 2012, Current status of trace metal pollution in soils affected by industrial activities, Scientific World Journal, 2012:916705. doi: 10.1100/2012/916705.
[2]. Liu Y,, Su C., Zhang H., Li X., Pei J., 2014, Interaction of soil heavy metal pollution with industrialisation and the landscape pattern in Taiyuan city, China, PLoS One, 24, 9(9): e105798. doi: 10.1371/journal.pone.0105798. eCollection 2014.
[3]. Zhang X., Zhong T., Liu L., Ouyang, X. 2015, Impact of Soil Heavy Metal Pollution on Food Safety in China, PLoS One, 7;10(8): e0135182. doi: 10.1371/journal.pone.0135182. eCollection.
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Abstract:：In recent years, discovering new compounds that have biological activity were studied by many researchers. In this paper, four metal complexes have been synthesized from Ni (II) and Zn (II) chloride and ligands 2-((3-nitrophenylimino) methyl) phenol (HL1) and 2-((4-nitrophenylimino) methyl) phenol (HL2) in 1:2 M ratio. FTIR and molar conductance measurements were used to characterize the structure of complexes. The complexes were found to be non electrolytic on the basis of molar conductance studies. The metal complexes have also been tested for their PH activity at different concentrations by used RSM.

Keywords: Metal complexes, Schiff bases, RSM

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[5]. Hilmy K M H, Soliman D H, Shahin E B A and Alhameed R A (2012) Synthesis and molecular modeling study of novel pyrrole Schiff bases as anti-HIV-1 agents. Life Sci J 9(2): 736-45.8.

Abstract: A number of new derivatives of 5-(((2-chloroquinoxalin-3-yl)amino)methyl)-3-(3,4-substituted phenyl) oxazolidin-2-ones(6a-I) are prepared by the reaction of 2,3-Dichloroquinoxaline(4) with 5-(aminomethyl)-3-(3,4-substitutedphenyl)oxazolidin-2-ones (5a-I).The antibacterial and antifungal activity of all the new derivatives of 5-(((2-chloroquinoxalin-3-yl)amino)methyl)-3-(3,4-substituted phenyl) oxazolidin-2-ones were evaluated against some bacterial and fungal strains and showed promising results. The structures of the resulted compounds were identified and confirmed by elemental analysis and IR, Mass, 1HNMR and 13CNMR spectroscopies.

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Abstract: This research assessed the levels of some trace metals in suspended particles of street dust from four locations with high anthropogenic activities in Eket. Similar analyses were carried out in AfahaOffiong (control) with little or no activities. The results revealed that levels of the metals were higher in the four locations than in the control. Physicochemical parameter analyses gave variable results between the four locations and the control. Correlation between the trace metals indicated high positive values at p < 0.05. Negative values were observed between sand and silt at p = 0.05. Negative values were equally seen between pH and SO42- and between electrical conductivity and NO3-at p = 0.05. Principal component analysis revealed human activities as the major factor for the presence............

Keywords: Trace metals, street dust, anthropogenic activities, Eket, environment, Pollution

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[5]. Al-Shayep, SM., Seaward, MR. Heavy metal content of roadside soils along ring road in Riyadh. Asian Journal of Chemistry. 2001; 13: 407 -423.

Abstract: From an extract of the leaves of Stevia rebaudiana, seven new steviol glycosides were isolated. Their structures were elucidated based on extensive spectroscopic (NMR and MS) studies.

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[3]. V.S.P.Chaturvedula, J.F.Clos, J.Rhea, D.Milanowski, U.Mocek, G.E.DuBois, and I.Prakash, Minor diterpenoid glycosides from the leaves of Stevia rebaudiana. Phytochem. Lett. 4,2011, 209-212.
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