Edith Sebata - Academia.edu (original) (raw)
Uploads
Papers by Edith Sebata
The ability to convert a waste by-product, sunflower seed husk (Helianthus annuus), into an econo... more The ability to convert a waste by-product, sunflower seed husk (Helianthus annuus), into an economically cheap adsorbent has been investigated for nitrate removal from aqueous solution through sorption studies. The sunflower seed husk was characterized by physisorption, Brunauer Emmet Teller (BET). Fourier transform Infrared (FTIR) were recorded before and after adsorption to explore the number and position of the functional groups available for nitrate binding on to the studied adsorbent. Optimum adsorption conditions for nitrate removal were determined as a function of pH, adsorbent dosage and contact time. The sorption capacity decreased with increasing sorbent dosage. The optimum contact time was 120 min, optimum biomass dose was 3.0 g and the optimum pH for nitrate removal was 2.0. The adsorption data conformed to both the Langmuir and the Freundlich isotherms but fitted best into the Langmuir model. The R 2 for Langmuir equation was 0.9940 and that for Freundlich was 0.8190. T...
The removal of atrazine from aqueous solution was performed using bambara groundnut hulls powder ... more The removal of atrazine from aqueous solution was performed using bambara groundnut hulls powder as a biosorbent by batch adsorption studies. The operating variables studied were pH, adsorbent dosage, contact time, initial concentration and temperature. The adsorption process was found to be highly pH dependent, with pH 7.0 being optimum. The biomass required at saturation was 0.9 g and the equilibrium was reached after 120 min. The Freundlich isotherm equation fitted the equilibrium data for atrazine sorption. The Q max and K f values were found to be 3.5236 mg/g and 0.3221 mg/g respectively. The aforementioned parameters indicated that bambara groundnut hulls could be used as a new and efficient adsorbent material for the removal of atrazine from wastewaters. The equilibrium isotherm was found to be pseudo first order with an equilibrium constant of 0.01313 min -1 . Desorption experiments were carried out and the desorption percentage ranged from 45 to 70%
Stearic acid was extracted from adipose tissue which was obtained from a waste heap from a local ... more Stearic acid was extracted from adipose tissue which was obtained from a waste heap from a local tannery. The waste adipose tissue was prepared for use by cutting, mixing, cleaning and refrigeration. By solvent extraction using methyl ether, a solid fat was obtained which was then hydrolyzed using water at 60 o C and heterogeneous catalyst stones of calcium and magnesium oxide. Chemical characterization of stearic acid white flakes for parameters such as the melting point, specific gravity, iodine value, acid value and copper and manganese content was performed. A fatty acid yield of 68% was obtained. The iodine value of 10.02 and the melting point of 50.3 o C show a reasonable degree of saturation and stability. A high level of 198.89 acid value was obtained. The absence of copper and manganese, content which were determined qualitatively, indicates the suitability of the extracted stearic acid for rubber compounding without being a catalyst of ageing. Its specific gravity of 0.8533 indicates its lightness in respect to rubber compounding. Physical tests on the rubber compounded with the stearic acid were performed according to SATRA standards for general product safety. Simulated vulcanization tests on the rheometer were within 2 minutes, which is suggestive of activation. The rubber had a tensile strength of 6.527 x 10 3 , abrasion resistance of 0.96 and hardness of 75, which are all indicative of a good service life of rubber compounded with the stearic acid.
Research on Chemical Intermediates, 2015
International Journal of Scientific Research in Environmental Sciences, 2014
Desalination and Water Treatment, 2014
Environmental Progress & Sustainable Energy, 2013
The ability to convert a waste by-product, sunflower seed husk (Helianthus annuus), into an econo... more The ability to convert a waste by-product, sunflower seed husk (Helianthus annuus), into an economically cheap adsorbent has been investigated for nitrate removal from aqueous solution through sorption studies. The sunflower seed husk was characterized by physisorption, Brunauer Emmet Teller (BET). Fourier transform Infrared (FTIR) were recorded before and after adsorption to explore the number and position of the functional groups available for nitrate binding on to the studied adsorbent. Optimum adsorption conditions for nitrate removal were determined as a function of pH, adsorbent dosage and contact time. The sorption capacity decreased with increasing sorbent dosage. The optimum contact time was 120 min, optimum biomass dose was 3.0 g and the optimum pH for nitrate removal was 2.0. The adsorption data conformed to both the Langmuir and the Freundlich isotherms but fitted best into the Langmuir model. The R 2 for Langmuir equation was 0.9940 and that for Freundlich was 0.8190. T...
The removal of atrazine from aqueous solution was performed using bambara groundnut hulls powder ... more The removal of atrazine from aqueous solution was performed using bambara groundnut hulls powder as a biosorbent by batch adsorption studies. The operating variables studied were pH, adsorbent dosage, contact time, initial concentration and temperature. The adsorption process was found to be highly pH dependent, with pH 7.0 being optimum. The biomass required at saturation was 0.9 g and the equilibrium was reached after 120 min. The Freundlich isotherm equation fitted the equilibrium data for atrazine sorption. The Q max and K f values were found to be 3.5236 mg/g and 0.3221 mg/g respectively. The aforementioned parameters indicated that bambara groundnut hulls could be used as a new and efficient adsorbent material for the removal of atrazine from wastewaters. The equilibrium isotherm was found to be pseudo first order with an equilibrium constant of 0.01313 min -1 . Desorption experiments were carried out and the desorption percentage ranged from 45 to 70%
Stearic acid was extracted from adipose tissue which was obtained from a waste heap from a local ... more Stearic acid was extracted from adipose tissue which was obtained from a waste heap from a local tannery. The waste adipose tissue was prepared for use by cutting, mixing, cleaning and refrigeration. By solvent extraction using methyl ether, a solid fat was obtained which was then hydrolyzed using water at 60 o C and heterogeneous catalyst stones of calcium and magnesium oxide. Chemical characterization of stearic acid white flakes for parameters such as the melting point, specific gravity, iodine value, acid value and copper and manganese content was performed. A fatty acid yield of 68% was obtained. The iodine value of 10.02 and the melting point of 50.3 o C show a reasonable degree of saturation and stability. A high level of 198.89 acid value was obtained. The absence of copper and manganese, content which were determined qualitatively, indicates the suitability of the extracted stearic acid for rubber compounding without being a catalyst of ageing. Its specific gravity of 0.8533 indicates its lightness in respect to rubber compounding. Physical tests on the rubber compounded with the stearic acid were performed according to SATRA standards for general product safety. Simulated vulcanization tests on the rheometer were within 2 minutes, which is suggestive of activation. The rubber had a tensile strength of 6.527 x 10 3 , abrasion resistance of 0.96 and hardness of 75, which are all indicative of a good service life of rubber compounded with the stearic acid.
Research on Chemical Intermediates, 2015
International Journal of Scientific Research in Environmental Sciences, 2014
Desalination and Water Treatment, 2014
Environmental Progress & Sustainable Energy, 2013