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Ubong Eduok,E. Inam,S.A. Umoren,I.A. Akpan 한국자원공학회 2013 Geosystem engineering Vol.16 No.2
The inhibition of a substituted naphthol compound, 4-(4-nitrophenylazo)-1-naphthol (44NIN), on the corrosion of aluminium (Al) in a basic medium was studied by classical chemical (gravimetric) and spectrophotometric (UV–Vis and FTIR) methods at 303–333 K. 44NIN demonstrated an excellent inhibiting property to Al corrosion in the aerated binary alkaline solution as shown from the results. The inhibition efficiency was found to increase with the azo dye concentration but not with temperature. Thermodynamic and adsorption evaluation for this inhibition process were accessed and thoroughly discussed. The UV–visible absorption spectra of the solution containing this dye after the immersion of Al specimen indicate the possible formation of a 44NIN–Fe type complex. The FTIR was carried out of the dye and protective film formed on the surface of the metal in the electrolyte containing the dye after a 72 h immersion period. These results show a correlation between the inhibitive effect and molecular structural information of 44NIN in this typical heterogeneous alkaline system.
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Joeseph P. Essien,Godwin E. Udofia,Edu Inam,김경웅 한국자원공학회 2010 Geosystem engineering Vol.13 No.4
Toxicity and heavy metal tolerance potentials of hyphomycetous fungi from epipellic sediments of the Qua Iboe Estuary, Nigeria were investigated ex situ in laboratory microcosms. Indigenous fungi were exposed to Pb, Zn, Ni, Cu and Cr for 90 days following sediment simulation with varying concentrations of the appropriate metallic salts. Growth pattern after acclimation revealed that Aspergillus glaucus – ESM7 exhibited tolerance to Cr, A. repens – ESM4 to Zn and A. niger –ESM10 to Cu. Fusarium semitectum – ESM18 tolerated Ni and Penicillium digitatum – ESM8 resisted toxicity due to Pb. However results of the toxicity assay showed that the radial growth rate of A. glaucus – ESM7 was retarded by 60 mgl-1 of Cr, while that of A. repens – ESM4 in 328 mgl-1 of Zn and Penicillium digitatum – ESM8 in 140 mgl-1of Pb were apparently enhanced by the metals. On the other hand Ni at 241 mgl-1 was toxic and highly inhibitory to F. semitectum – ESM18 while 83 mgl-1 of Cu significantly (Students t –test, P = 0.05) enhanced the growth of A. niger –ESM10 when compared with the control. Based on these findings A. niger may be regarded as a promising mycoremediation agent for the removal of Cu from metal contaminated environment. It is also suggestive that because of the growth enhancing effect of Zn and Pb on A. repens – ESM4 and Penicillium digitatum – ESM8 minimal concentrations of the metals may plausibly be incorporated into mycological media for quick recovery of the moulds. On the other hand because of its toxic effect on Fusarium semitectum – ESM18, Ni may be adapted as an excellent biocide component for the formulation of fungicidal preparations against plant diseases caused by fusaria provided that the acceptable background level of Ni is not exceeded. However, more detailed information is required in order to optimize the conditions for maximum utilization of these metals and hyphomycetous fungi in useful environmental and biotechnological activities.
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The role of pH in metal ion removal using coir dust and its modified extract resins
AU Israel,UM Eduok,E. Inam,Kyoung-Woong Kim 한국자원공학회 2012 Geosystem engineering Vol.15 No.4
The role of pH on metal ion adsorption by unmodified coir dust and its modified extract forms (namely carboxylated and sulphonated coir extract resins) was studied in a batch system. The zero point charge pH (pH pzc) of the adsorbents was determined and the results demonstrated that the amount of metal ions adsorbed by the adsorbents was dependent on pH(pzc). The adsorption of these metal ions by the adsorbent increased with increasing pH. The unmodified coir dust, being a lignocellulosic material, removed more metal ions than the modified coir extract resins derived from a tannin-polyhydroxy compound. Hydroxyl, carboxylic and sulphonic functional groups are responsible for the metal ion binding in these adsorbents,as revealed by infra-red spectroscopic analysis. Coir dust, carboxylated coir extract (CTR) and sulphonated coir extract resin (STR) are effective adsorbents for removal of metal ions from aqueous solution and industrial effluents/wastewater.
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Essien, Joeseph P.,Udofia, Godwin E.,Inam, Edu,Kim, Kyoung-Woong 한국암반공학회 2010 Geosystem engineering Vol.13 No.4
Toxicity and heavy metal tolerance potentials of hyphomycetous fungi from epipellic sediments of the Qua Iboe Estuary, Nigeria were investigated ex situ in laboratory microcosms. Indigenous fungi were exposed to Pb, Zn, Ni, Cu and Cr for 90 days following sediment simulation with varying concentrations of the appropriate metallic salts. Growth pattern after acclimation revealed that Aspergillus glaucus - $ESM_7$ exhibited tolerance to Cr, A. repens - $ESM_4$ to Zn and A. niger - $ESM_{10}$ to Cu. Fusarium semitectum - $ESM_{18}$ tolerated Ni and Penicillium digitatum-$ESM_8$ resisted toxicity due to Pb. However results of the toxicity assay showed that the radial growth rate of A. glaucus - $ESM_7$ was retarded by $60\;mgl^{-1}$ of Cr, while that of A. repens - $ESM_4$ in $328\;mgl^{-1}$ of Zn and Penicillium digitatum-ESM8 in $140\;mgl^{-1}$ of Pb were apparently enhanced by the metals. On the other hand Ni at $241\;mgl^{-1}$ was toxic and highly inhibitory to F. semitectum - $ESM_{18}$ while $83\;mgl^{-1}$ of Cu significantly (Students t-test, P = 0.05) enhanced the growth of A. niger - $ESM_{10}$ when compared with the control. Based on these findings A. niger may be regarded as a promising mycoremediation agent for the removal of Cu from metal contaminated environment. It is also suggestive that because of the growth enhancing effect of Zn and Pb on A. repens - $ESM_4$ and Penicillium digitatum - $ESM_8$ minimal concentrations of the metals may plausibly be incorporated into mycological media for quick recovery of the moulds. On the other hand because of its toxic effect on Fusarium semitectum - $ESM_{18}$, Ni may be adapted as an excellent biocide component for the formulation of fungicidal preparations against plant diseases caused by fusaria provided that the acceptable background level of Ni is not exceeded. However, more detailed information is required in order to optimize the conditions for maximum utilization of these metals and hyphomycetous fungi in useful environmental and biotechnological activities.
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