پديد آورنده :
توانايي، مرضيه
عنوان :
برهم كنش سودوموناس پوتيدا با پاليگورسكيت و سپيوليت و توانايي جذب سرب توسط باكتري در حضور و عدم حضور كاني ها
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي
صفحه شمار :
پانزده،86ص.: مصور،جدول،نمودار(رنگي)
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
مهران شيرواني
استاد مشاور :
فرشيد نوربخش، محمدرضا مصدقي
توصيفگر ها :
كاني هاي رسي فيبري , هم دما , سينتيك
تاريخ نمايه سازي :
20/3/93
استاد داور :
مجيد افيوني، محسن سليماني
چكيده انگليسي :
87 Interactions of Pseudomonas putida with Palygorskite and Sepeiolite and Ability of the Bacteria for Pb Sorption in the Presence and Absence of the Minerals Marziyeh Tavanaei marzieh tavanaei@ag iut ac ir January 2014 Department of Soil Science Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiMehran Shirvani shirvani@cc iut ac irAbstractBacteria are the most abundant microorganisms in the soil The roles of these microorganismsin soil fertility nutrient cycling and formation and stability of soil structure are well known Pseudomonas putida is a unique soil bacterium regarding its various functions in the soil About 80 90 of the soil bacterial cells can be adsorbed on the surface of the soil colloids Clay minerals with large specific surface area and high cation exchange capacity act as strongadsorbents and preferred habitat for bacteria The interactions between bacteria and clayminerals can significantly alter the activity and ecological distribution of the bacteria as wellas the biomineralization mineral weathering and biodegradation of pollutants in the soil Heavy metals contamination due to natural and anthropogenic sources is a globalenvironmental concern Heavy metals like lead can be adsorbed by the surfaces of both clayminerals and bacteria High concentration of lead as one of the most toxic heavy metals inthe environment can cause severe toxic effects to exposed plants animals and humans Thisstudy examined the interactions between P putida with palygorskite and sepiolite clayminerals as the clays frequently found in arid and semiarid region soils Also the abilities ofthe P putida and its composites with the clays to accumulate lead were investigated Theresults of kinetic tests showed that maximum adsorption of P putida on the mineralsoccurred within the initial 20 30 min and no significant increase in adsorption was observedafter 1 h of contact Therefore contact time of 1 h was chosen to construct equilibriumadsorption isotherms Power function model was selected as the best model for describing P putida sorption kinetics on the clays Result of the equilibrium studies showed thatFreundlich and Langmuir models were good models describing P putida sorption onpalygorskite and sepiolite A higher affinity as well as a larger amount of adsorption of P putida was found on sepiolite as compared to the palygorskite Pseudomonas putida showeda considerable capacity to sorb lead ions Lead sorption isotherms were sufficiently fittedwith the Langmuir and Freundlich models Maximum lead adsprption capacity qmax of P putida was estimated to be 582 4 mg g 1 Sorption of lead decreased with the increase ofbacteria in composite bacteria clay Composites of bacteria sepiolite were more effectivethan bacteria palygorskite in lead absorption Key Words Pseudomonas putida P168 Fibrous clay minerals Lead Isotherms Kinetics
استاد راهنما :
مهران شيرواني
استاد مشاور :
فرشيد نوربخش، محمدرضا مصدقي
استاد داور :
مجيد افيوني، محسن سليماني
