Hency Thacker

Dans la pr sente tude, les extraits d'isopropanol des feuilles m les et femelles de Phoenix Dactylifera L. ont t valu s pour leur efficacit inhiber la corrosion de l'aluminium dans des conditions acides de HCl 1M. L'efficacit de l'inhibition de l'inhibiteur augmente avec l'augmentation du dosage de l'inhibiteur. Les extraits de feuilles m les et femelles de Phoenix Dactylifera L. sont enrichis en substances phytochimiques, savoir prot ines, acides amin s, saponines, flavono des, huiles, graisses, terp no des et st ro des. Gr ce leurs h t roatomes, ces substances phytochimiques sont adsorb es sur la surface de la plaque m tallique et emp chent ainsi le processus de transfert de masse pendant la corrosion. L'adsorption des Phoenix Dactylifera L m les et femelles sur la surface des plaques d'aluminium est conforme l'isotherme d'adsorption de Langmuir.

The present book covers glimpse on basic formulae and concepts of adsorption and colligative properties of the solution along with solved Numericals. This would provide them a quick revision for different concepts in colligative properties of the solution like depression in freezing point, elevation in boiling point, osmotic pressure, degree of association and dissociation, concentration of solution in the terms of normality, molarity, and molality and so on. Also different concepts of adsorption like chemisorption, physisorption, factors affecting adsorption, Langmuir adsorption isotherm, Fruendlich adsorption isotherm are also covered.

Phoenix Dactylifera L. commonly known as date palm is a dioeceous plant which means it has separate male and female saplings. In the present study, phytochemical screening and proximate value determination of male and female date palm species is carried out so as to understand seasonal and regional variation in them. The analysis of proximate values of male date palm, sweet female date palm and unsweet female date palm revealed that crude fiber and moisture content exhibited significant variation during three seasons: after flowering, during flowering and before flowering seasons. During flowering season, ash content of all three species remained uniform while the moisture content had considerable variation.

In the present study, Iso-propanol extracts of male and female Phoenix Dactylifera L. leaves are evaluated for their effectiveness to inhibit corrosion of aluminum under 1M HCl acidic conditions. The inhibition of efficiency of the inhibitor increases with increase in inhibitor dosage. Both male and female Phoenix Dactylifera L. leaves extract are enriched with phytochemicals namely proteins, amino acids, saponins, flavanoids, oils, fats, terpenoids and steroids. By the means of their hetero atoms, these phytochemicals are adsorbed on the surface of metal plate and hence prevents mass transfer process during corrosion. The adsorption of male and female Phoenix Dactylifera L onto the surface of aluminum plates is in accordance with Langmuir adsorption isotherm.

Dans la pr sente tude, l'extrait de Phoenix Dactylifera L. est analys pour son potentiel de pr vention de la corrosion de l'aluminium en milieu acide HCl 1N par la mesure de la perte de poids. L'extrait ac tonitrile de Phoenix Dactylifera L. comprend une vari t de substances phytochimiques telles que des prot ines, des acides amin s, des hydrates de carbone, des ph nols, des flavano des, des phlobatannins, des quinines, des r sines, des st ro des et des triterp no des. Ces produits phytochimiques sont adsorb s sur la surface des plaques m talliques gr ce aux h t roatomes qu'ils contiennent. Le comportement d'adsorption de ces produits phytochimiques sur la surface des plaques d'Al est conforme l'isotherme d'adsorption de Langmuir. La valeur de l' nergie libre d'adsorption de Gibb est de -7,37 KJ mol-1, ce qui indique une physisorption spontan e des mol cules d'extrait sur la surface des plaques d'Al.

Nel presente studio, l'estratto di Phoenix Dactylifera L. stato analizzato per il suo potenziale di prevenzione della corrosione dell'alluminio in ambiente acido 1N HCl mediante misurazione della perdita di peso. L'estratto di acetonitrile di Phoenix Dactylifera L. comprende una variet di sostanze fitochimiche come proteine, aminoacidi, carboidrati, fenoli, flavanoidi, filobatannini, chinine, resine, steroidi e triterpenoidi. Queste sostanze fitochimiche vengono adsorbite sulla superficie delle piastre metalliche grazie all'atomo etero presente in esse. Il comportamento di adsorbimento di queste sostanze fitochimiche sulla superficie delle piastre di Al conforme all'isoterma di adsorbimento di Langmuir. Il valore dell'energia libera di Gibb per l'adsorbimento risultato pari a -7,37 KJ mol-1, indicando un fisioassorbimento spontaneo delle molecole di estratto sulla superficie delle piastre di Al.

Este livro descreve a adsor o de i es c pricos nas folhas de Phoenix Dactylifera L. descrito. O fen meno de adsor o dependente do pH, dose adsorvente, concentra o inicial, temperatura e tempo de agita o. Al m disso, este processo foi avaliado por isotermas de adsor o, nomeadamente langmuir, Fruendlich, Temkin, Hasley, Jonovaic e assim por diante. Os modelos cin ticos pseudo primeira ordem, pseudo segunda ordem, Elovich, Intra-part culas de difus o s o tamb m avaliados. As condi es ptimas para a capta o de i es c pricos foram encontradas a pH=1,5, dose adsorvente =0,2 gm, concentra o inicial= 10ppm, tempo de agita o =30 minutos. A adsor o melhor descrita pelo modelo de isoterma de adsor o Temkin e modelo cin tico pseudo de segunda ordem. A capacidade m xima de adsor o foi avaliada como sendo de 2,48 mg/g.