Adsorption performance of activated carbon from leather buffing waste / J. D. Putshak'a in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 10 (10/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 10 (10/2010) . - p. 313-319 Titre : Adsorption performance of activated carbon from leather buffing waste Type de document : texte imprimé Auteurs : J. D. Putshak'a, Auteur ; I. O. Akpabio, Auteur Année de publication : 2010 Article en page(s) : p. 313-319 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : An adsorption study was carried out with powdered activated carbon (PAC) prepared from leather buffing waste by steam activation after carbonization at temperatures between 500–800°C. Adsorption performance of each activated carbon test was carried out using methylene blue, a medium sized dye molecule commonly used to determine adsorption efficiency of adsorbents. The results obtained reveal an increase in adsorption of methylene blue with decrease in temperature of carbonization indicating that lower temperature of carbonization yields carbon with greater adsorption capacity. Also, this suggests that carbonization at temperatures below 500°C may be preferred. The carbon had adsorption capacity of 90.4mg/L of a solution containing 100mg/l of the dye. The effect of time and carbon dosage on adsorption indicates that activated carbon from leather buffing waste is competitive with the reference carbon indicating it can be used to adsorb dyes, decolorize organic compounds and treat waste water. Data corresponding to the adsorption of methylene blue onto the best activated carbon produced (BD5) using the Freundlich and Langmuir adsorption isotherm model established a fit with an R2value of 0.915 and 0.989 respectively. En ligne : https://drive.google.com/file/d/1IL4pDWr4YEr0cjkiEshE60h1scsDoMIO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10514 [article]

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Application of infusion from leaf of hisbiscus sabdariffa in deliming / J. D. Putshak'a in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 1 (01/2013)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVIII, N° 1 (01/2013) . - p. 11-15 Titre : Application of infusion from leaf of hisbiscus sabdariffa in deliming Type de document : texte imprimé Auteurs : J. D. Putshak'a, Auteur ; K. I. Adamu, Auteur ; F. S. Tanko, Auteur ; R. O. Iyun, Auteur Année de publication : 2013 Article en page(s) : p. 11-15 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux Déchaulage Opération consistant à débarrasser les peaux de la chaux et des substances alcalines qui leur ont été appliquées au pelanage. Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : For efficient control, and to produce a particularly fine grain in the leather, ammonium sulfate (or boric acid) is conventionally used as a deliming agent. It us used in the amounts necessary to neutralize the alkali in pelts after the liming and unhairing processes in leather manufacture. A 5% infusion from leaf of Hibiscus Sabdariffa was evaluated as an alternative deliming agent in leather processing. After extraction, the pH of the infusion was found to be 3.18. The deliming value of the infusion was determined by titrating the infusion against 20ml solution of 3% Calcium hydroxide. The volume of the infusion required and optimum time taken to delime 50g of limed pelt was also determined. Several deliming trials were also undertaken; complete deliming of limed pelt was achieved with 50ml of the infusion within a period of 40 minutes as against the deliming period of 1 hour recorded for solution of ammonium sulfate. From results obtained after deliming trials and from physical observations made on the pelts, the infusion was discovered to effectively delime pelts almost competing and compared favorably to the conventional deliming agents such as ammonium sulfate. The infusion of Hibiscus Sabdariffa can thus be introduced, after further investigation, for use as a deliming agent in the leather industry. Note de contenu : - Sample collection and preparation - Preparation of infusion - Determination of pH of infusion and of conventional deliming agent - Determination of deliming value - Deliming trails - Determination of volume of infusion to effectively delime pelt - Optimum time for deliming by infusion En ligne : https://drive.google.com/file/d/1-0X02FXoNwwqD1fnTDbz-TxyOCBbzYFk/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16927 [article]

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Effluent treatment from tannery buffing dust / J. D. Putshak'a in LEATHER INTERNATIONAL, Vol. 213, N° 4808 (04/2011)  

[article]  inLEATHER INTERNATIONAL > Vol. 213, N° 4808 (04/2011) . - p. 39-41 Titre : Effluent treatment from tannery buffing dust Type de document : texte imprimé Auteurs : J. D. Putshak'a, Auteur ; K. I. Adamu, Auteur ; H. M. Adamu, Auteur ; Abubakar Tafawa Balewa, Auteur Année de publication : 2011 Article en page(s) : p. 39-41 Langues : Anglais (eng) Catégories : Adsorption Charbon actif Cuirs et peaux -- Industrie -- Aspect de l'environnement Eaux usées -- Epuration Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In an attempt to find a viable alternative destination for leather buffing waste than landfill researchers at the Cheltech - laboratory, Zaria Nigeria, investigated the adsorption efficiency of activated carbon prepared from leather buffing dust in the treatment of tannery effluent. The optimum pH value at which the effluent was effectively decolourised was establishede to be pH 5.0. At this ph, the minimum carbon dosage and time to effectively remove some heavy metals and decolourise the effluent sample by the activated carbon was determined. The highest percentage decolourisation of the effluent was observed after treatment with 0.6g of activated carbon from leather buffing dust. The minimum period taken to successfully decolourise the effluent was 50 minutes using the determined pH and recorded minimum carbon dosage. Percentage reduction in the concentration of some heavy metals in the effluent was 96,37 %, 28,43 %, 87,87 %, 3,23 % and 0,00 % for chromium lead, iron copper and cadmium, respectively. BOD of the effluent sample was reduced by 84,15 % while COD was reduced by 80,63 %. In comparative terms, the performance of activated carbon from leather buffing waste can be said to compete closely with that of the reference carbon used in this study. It can, therefore, be recommended for treatment of tannery effluent especially where the effluent is being recycled. Note de contenu : - Activated carbon - Activated carbon from leather buffing dust - Preparation - Effluent decolorisation : Determination of optimum pH to effect decolorisation - Effect of carbon dosage on decolourisation - Effect of time decolourisation - Reduction of BOD - Reduction of BOD - Reduction of heavy metals En ligne : https://drive.google.com/file/d/1iZZJ8I3pkBCrznuDbvFqN3Va8FZkMhoq/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11670 [article]

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