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SADAF BHUTTO 《The International journal of environmental studies》2013,70(6):888-903
Activated carbon was prepared as an adsorbent from low cost Lakhra coal (LC) (Lignite grade) by chemical activation for the removal of Pb(II) from aqueous solution. The variables of pH, adsorbent dose, agitation time, ionic strength and temperature were investigated. The sorption process followed pseudo-first-order kinetics, intra-particle diffusion and Langmuir isotherm models. Evaluation of thermodynamic parameters affirmed the spontaneity of the process. The study also included the surface properties of activated Lakhra coal (ALC) by FTIR, scanning electron microscope and energy dispersive spectroscopy. The maximum Pb(II) removal capacity of ALC was 758?±?8?mg?g?1 at 32?°C, approximately 300 times higher than without activation. This value was higher than other previously reported values. Thus, this study demonstrated that indigenous LC has excellent potential to be used as an economically feasible adsorbent after activation for the treatment of wastewater bearing Pb(II). 相似文献
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TAHIR YAQUB SUMARA SADAF NADIA MUKHTAR HAFSA ZANEB MUHAMMAD ZUBAIR SHABBIR ARFAN AHMAD ASIM ASLAM KAMRAN ASHRAF NISAR AHMAD HABIB‐U REHMAN 《International Journal of Dairy Technology》2012,65(3):360-364
The effects of time elapsed after milking and lactation stage were assessed on the lactoperoxidase (LP) enzyme activity and concentrations of thiocyanate in Sahiwal cattle (N = 15) and Nili‐Ravi buffaloes (N = 15). The LP activity and thiocyanate concentrations decreased as the time elapsed after milking (P < 0.05) but the concentration of these components increased as the lactation advanced. The LP enzyme activity was sufficient until 12 h post milking but the thiocyanate concentration after 8 h decreased to an insufficient level to activate the LP System, hence additional thiocyanate would be beneficial from external sources. No difference was noted regarding the LPS activity in cattle and buffaloes at the time of collection and subsequently after storage. However, at the end of lactation, the thiocyanate concentration was lower in buffaloes than that in cattle. (P < 0.05). 相似文献
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