چاپ صفحه |  صفحه نخست سامانه |  نویسندگان |  اطلاعات تفضیلی |  دانلود مقاله | دانشگاه علوم پزشکی تبریز |
| نویسنده | نفر چندم مقاله |
|---|---|
| وحیده طرح ریز | سوم |
| آزیتا دیلمقانی | دوم |
| محمد سعید حجازی | سوم |
| عنوان | متن |
|---|---|
| خلاصه مقاله | The increase of industrial activities has intensified environmental pollution and the use of biological materials for effective removal and recovery of heavy metals from contaminated wastewaters. The aim of this study was the laboratory study of biosorption. Biosorption involves a combination of active and passive transport mechanisms, starting with the diffusion of metal ions to the surface of microbial biomass. These bioprocesses are generally divided into two categories: 1) passive uptake by using non-living biomass 2) bioaccumulation by applying living cells. In this study biosorption of each of ions [Ni2+, Pb2+, Co2+] in a batch stirred system was investigated. Tabrizicola aquatica was a novel alphaproteobacterium isolated from Qurugöl Lake nearby Tabriz city. Strain RCRI19 was used as biosorbent for removal of [Ni2+, Pb2+, Co2+]. The dried powered dead cells were prepared and exposed to metal ions. After centrifuging, Supernatant was separately used to estimate for residual metal concentration by using atomic absorption spectrophotometric method. The equilibrium adsorptive quantity was determined to be a function of initial metal concentration, dried powdered cell concentration, contact time and PH. So the Effect of initial metal concentration (10-300mg/l), dried powdered cell concentration (0.25-10gr/l), contact time (15-180min) and pH (3-7) was investigated. Laboratory equilibrium sorption data were explained by Langmuir and freundlich model. Adsorption isotherm parameters (adsorbed quantity of the metal ion per gram of dried biosorbent) for [Ni2+, Pb2+, Co2+] were characterized. In order to investigate biosorption kinetics, characteristic constant of adsorption rate were determined by using a pseudo-first-order equation model. |
| کلمات کلیدی | metal pollution remediation, passive biosorption, Langmuir isotherm, freundlich isotherm |
| نام فایل | تاریخ درج فایل | اندازه فایل | دانلود |
|---|---|---|---|
| 2.pdf | 1398/03/11 | 129951 | دانلود |
| 2.JPG | 1398/03/11 | 783007 | دانلود |
