Omotayo Amuda | Ladoke Akintola university of technology, Ogbomoso, Oyo state, Nigeria. (original) (raw)

Papers by Omotayo Amuda

Handbook of environmental engineering, 2021

Advances in Biological Chemistry, 2011

Monosulphides of O-phenyl-N-substituted phenylcarbamates were prepared by the reaction between Op... more Monosulphides of O-phenyl-N-substituted phenylcarbamates were prepared by the reaction between Ophenyl-N-substituted phenylcarbamates and sulphur dichloride while the corresponding disulphides were prepared by the reaction between O-phenyl-Nsubstituted phenylcarbamates and sulphur monochloride. The synthesized compounds were characterized by elemental analysis, thin layer chromatography (TLC), Fourier-transform infrared, 1 H and 13 C nuclear magnetic resonance spectroscopic techniques. In vitro fungicidal assay of these sulphides against Fusarium oxysporum, Aspergillus niger, Aspergillus flavus and Rhizopus stolonifer showed that they were more fungicidal than their parent carbamates. The synthesized sulphides were more active towards Aspergillus niger and Aspergillus flavus. There was little or no variations in the fungicidal activities of the synthesized monosulphides and disulphides of O-phenyl-N-substituted phenyl carbamates.

The levels of isolated polycyclic aromatic hydrocarbons (PAH) in ash residues of wastes from some... more The levels of isolated polycyclic aromatic hydrocarbons (PAH) in ash residues of wastes from some major waste dumps in Lagos, Nigeria, were determined. The total amounts of the PAH in the ashes were in the range of 0.06-0.4 µg/g. The ash from the waste dump that contains the highest level also displayed greatest variety of PAH.

Journal of Applied Sciences and Environmental Management, Jun 24, 2009

This study investigated two methods for the removal of COD and colour from sanitary landfill leac... more This study investigated two methods for the removal of COD and colour from sanitary landfill leachates. The first method involved the use of coagulation/flocculation process using FeCl 3 as a conventional coagulant and Ca(OH) 2 as base-precipitant. The second method involved integration of Fenton's reagent into the coagulation/flocculation process. Concentration of FeCl 3 that reduced chemical oxygen demand (COD), and color by 37 and 62% is 1000mg/l. Fenton-coagulation flocculation process reduced the COD and color of the leachates by 88 and 98% respectively. The optimum conditions for the effectiveness of Fenton's reagent, namely temperature, pH, H 2 O 2 and coagulant dose were studied. @JASEM JASEM

Oriental journal of chemistry, Oct 25, 2015

Phosphonates are a class of organophosphorus compounds characterized by Carbon-Phosphorus (C-P) b... more Phosphonates are a class of organophosphorus compounds characterized by Carbon-Phosphorus (C-P) bond 1. Phosphonatesoccur widely among xenobiotics. Pollution of the environment by phosphonatesaroused interest in their pathways and mechanisms of biodegradation 2. As a result of their structural similarity to some phosphate esters, phosphonatescould act as inhibitors of enzymes 3 .

Journal Of Chemical Society Of Nigeria, Dec 9, 2019

Handbook of Advanced Industrial and Hazardous Wastes Management, 2017

© 2018 by Taylor & Francis Group, LLC. There are more than 20 heavy metal toxins contributing... more © 2018 by Taylor & Francis Group, LLC. There are more than 20 heavy metal toxins contributing to a variety of adverse health effects in humans. Exposed individuals experience different behavioral, physiological, and cognitive changes depending on the type of the toxin and the degree of exposure by the individual. This chapter presents the sources of exposure, toxicity, and control technologies of Cu, Zn, Mo, Ag, and rare earth elements in the environment

Integrated Natural Resources Research, 2021

The objectives of this research are to (a) demonstrate how to select an organic solvent (such as ... more The objectives of this research are to (a) demonstrate how to select an organic solvent (such as 1,1,1-trichloroethane) for spectrophotometric determination of cationic surfactant in water and wastewater; (b) investigate and recommend possible better organic solvents for surfactant analysis; and (c) introduce good laboratory practice for personal protection, laboratory protection, and hazardous waste management. Specifically, this research involves selection of alternate less toxic and greener organic solvent for use in a methyl orange method for colorimetric determination of cationic surfactants in the 0.2 to 2.0 mg/L range. The principles, steps and management of the methyl orange method include the following (a) complexation of cationic surfactant with methyl orange at acidic pH condition forming a methyl orange-surfactant complex; (b) organic solvent extraction; (c) water-solvent phase separation; (d) spectrophotometric measurement; and (e) good laboratory practice and laborator...

Advances in Industrial and Hazardous Wastes Treatment, 2016

Advances in Industrial and Hazardous Wastes Treatment, 2009

© 2010 by Taylor and Francis Group, LLC. All the water that is sent to the drain or is pooled tog... more © 2010 by Taylor and Francis Group, LLC. All the water that is sent to the drain or is pooled together after being subjected to one process or the other in an industry is known as wastewater. It is usually classified into municipal wastewater and industrial wastewater. Industrial wastewaters are primarily from both small-and large-scale industries, which predominantly include manufacturing industries. The type of industry greatly influences the characteristics of industrial wastewater both in type and in varying amount; depending on contaminants concentrations, industrial wastewater can be classified further into strong, adverse effects on humans and aquatic species

Bulletin of the Chemical Society of Ethiopia, 2007

Handbook of Environment and Waste Management, 2012

© 2012 by World Scientific Publishing Co. Pte. Ltd. All rights reserved. Despite the treatment pr... more © 2012 by World Scientific Publishing Co. Pte. Ltd. All rights reserved. Despite the treatment processes that a typical wastewater is subjected to, microorganisms present in the wastewater are not effectively removed. These pathogenic organisms play important roles in the spread of waterborne diseases.Important treatment process employed to destroy or inactivate these pathogenic microorganisms is called disinfection. Disinfection is an important application under chemical treatment process ofwastewater, which includes the use of chemical agents, such as compounds of chlorine, and/or nonchemical agents, such as heat, UV light, radiation, and mechanical means

Tropical Journal of Animal Science, 2004

Journal of Applied Sciences and Environmental Management, 2006

Attempts were made in this study to examine the effectiveness of polymer addition to coagulation ... more Attempts were made in this study to examine the effectiveness of polymer addition to coagulation process during treatment of a beverage industrial wastewater to remove some of its trace metals content such as lead, cadmium, total iron, total chromium, nickel and zinc. Experiments were conducted using the standard Jar test procedure to determine the performance of both ferric chloride and organic polymer (a non-ionic polyacrylamide) individually and ferric chloride-polymer combination. The dosages used for ferric chloride ranged from 0 to 500mg/l, whereas polymer dosages varied between 0 and 100mg/l. The (optimal) removal efficiency for total chromium in the wastewater was obtained at 300mg /l for ferric chloride and 65mg/l for polymer. Whereas for zinc and total iron, the optimal removal efficiencies were obtained at 500mg/l for ferric chloride and 65mg/l for polymer. Addition of ferric chloride resulted in significant removal of the metals reaching up to 91%, 72% and 54% of total chromium, zinc and total iron respectively while addition of polymer achieved 95%, 87% and 88% of total chromium, zinc and total iron respectively. Ferric chloride produced more voluminous and more compacted sludge than polymer. Combinations of ferric chloride and polymer at different ratio achieved better removal efficiencies of the metals in the range 84-97% for total chromium, 69-90% for zinc and 69-92% for total iron, also less sludge was produced. Lead, cadmium and nickel were not detected in the raw wastewater. @JASEM

Phytotherapy Research, 2004

An in vivo micronucleus assay using albino mice was used to examine the anticlastogenic effects o... more An in vivo micronucleus assay using albino mice was used to examine the anticlastogenic effects of a crude aqueous extract of Hibiscus sabdariffa fruits in bone marrow cells of mice. Various doses of freshly prepared crude extract of Hibiscus sabdariffa (50, 100 and 150 mg/kg b.w.) were given by gavaging to male laboratory bred Swiss albino mice for 7 days as a dietary supplement followed by a single dose of sodium arsenite (2.5 mg/kg b.w.) After 24 h, the animals were killed and bone marrow smears were prepared and stained in Giemsa. The results show that sodium arsenite effectively induced micronuclei in polychromatic erythrocytes (PCEs). Administration of a crude extract of Hibiscus sabdariffa led to a signiﬁcant reduction of micronuclei in PCEs. The results also show that a combination of Hibiscus sabdariffa and sodium arsenite reduced signiﬁcantly the frequencies of micronucleated PCEs induced by sodium arsenite. Copyright © 2004 John Wiley & Sons, Ltd.

Pesticides are chemicals that combat the attack of various pests on agricultural crops. The use o... more Pesticides are chemicals that combat the attack of various pests on agricultural crops. The use of synthetic pesticides has become an indispensable tool in agriculture. Their use over the years has led to serious environmental pollution. In view of this, efforts have been made by scientists to remove these pollutants from the environment. Degradation of pesticides pollutants by the use of microorganisms has been one of the most environmentally safe and cost effective methods, since these microorganisms exist in abundance in the environment. Glyphosate, an herbicide used for the control of weeds was made to undergo degradation by fungi isolates. The fungi growth was monitored by measuring cell turbidity with a UV-visible spectrophotometer (Genesys IOS VI) at 660nm. The released phosphate ion was determined by spectrophotometric analysis using a UV-Visible spectrophotometer (Genesys IOS VI) at 690nm, using Trichoderma viridae , Aspergillus niger , and Fusarium oxysporum fungi as biod...

Ghana Journal of Science, 2020

Commercially, available activated carbon (CAC) and coconut shell activated carbon (CSAC) were use... more Commercially, available activated carbon (CAC) and coconut shell activated carbon (CSAC) were used in the adsorption of Trichloromethane (TCM) from disinfected water using the optimum conditions (concentration, dosage, pH and time) obtained. Concentrations of TCM were determined using GC-MS. Physicochemical parameters of CSAC were investigated. The CSAC gave percentage carbon yield (86.72±1.41), surface area 1200 m2/g and CHNS/O Elemental Analyzer gave elemental Carbon of 60.08% as the highest of the elements in the char. A pore structure dispersed on the CSAC surface was observed. Best conditions for CSAC were: 1.4 × 104μg/l TCM, 5.0 pH, 0.8 g absorbent within 30 minutes. The data fitted Freundlich than Langmuir model (R2 of 0.9977 and 0.9232, respectively). Percentage removal of TCM for CAC and CSAC was 98.3±1.55 and 96.7±1.27, respectively for the water sample. Results indicated that CSAC was efficient for removal of TCM present in water and could be used as alternative for CAC i...

Ethiopian Journal of Environmental Studies and Management, 2016

Agro wastes are vast abundant raw material whose potential is still under-utilized. Availability ... more Agro wastes are vast abundant raw material whose potential is still under-utilized. Availability and biodegradability are a few features of these materials for utilization. The present study was aimed at exploiting the option of utilizing maize cob for remediation of industrial effluent. Maize cob was collected, pulverized and sieved into 150-300 µm particle size. The carbonized materials obtained were then characterized using Energy Dispersive Xray (EDX) and Scanning Electron Microscope (SEM) for elemental and surface morphology determination. Standard solutions of Cr and Pb ion solution were prepared. The cob were used to treat effluent under the following conditions: agitation time (30-150 min), adsorbent dosage (0.5-2.5 g), metal ion concentration (5-25 ppm) and particle size effect. From the result, 90 % and 38 % removal efficiency were obtained for Pb and Cr ions solution respectively. The potential of maize cob was established for the treatment of lead polluted wastewater.