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The 3rd Session of 2007 Workshop of Pakistan Academy of Sciences

作者： M.J.Islam M.R.Hossain A.Yousuf M.A.Subhan Department of Chemistry Shah Jalal University of Science and TechnologySylhet-3114Bangladesh Department of Chemical Engineering and Polymer Science Shah Jalal University of Science and TechnologySylhet-3114Bangladesh

This study evaluates the removal of arsenic from drinking water by using some bio-adsorbents such as jute stick powder（JSP）, jute leaf powder（JLP）, sugarcane powder（SCP）, lily leaf powder（LLP）, fish ayes powder（FAP）, egg’s skull（ES）, dheki（pteris） vegetable powder（DVP）, fern（Dryopteris ramosa） plant powder（FPP） and water hyacinth root powder（WRHP）. Both the batch and column studies were performed to assess the arsenic removal activity of bio-adsorbents. The isotherm study showed that the observed data of JSP, SCP, FAP and WHRP fit well to the Langmuir and Freundlich isotherm model. The adsorption capacities of JSP, JLP, DVP and FPP were 6.67×10-5 Kg/Kg, 5.21×10-5Kg/Kg, 4.79×10-5 Kg/Kg and 4.74×10-5 Kg/Kg. The K f values were 7.79×10-6 Kg/Kg（JSP）, 6.64×10-6Kg/Kg（JLP）, 1.3×10-5 Kg/Kg（DVP） and 1.06×10-5 Kg/Kg（FPP）. The values of Langmuir constant b,for JSP, JLP, DVP and FPP are 0.039, 0.046, 0.23 and 0.13, respectively. The Freundlich constants,n＞1 and the values of 1/n fell between 0.36 and 0.44 for JSP, JLP, DVP and FPP.

关键词： Safe drinking water arsenic removal bio-adsorbents

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biosorption of Crude Oil Spill Using Groundnut Husks and Plantain Peels as adsorbents

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Advances in Chemical Engineering and Science 2018年第3期8卷 161-175页

作者： Kenneth Kekpugile Dagde Department of Chemical/Petrochemical Engineering Rivers State University Port Harcourt Nigeria

Adsorption techniques using meshed groundnut husks and plantain peels have provided cheap alternative to the conventional methods of crude oil spillage control and also for good waste management approach. The biodegradable nature of these adsorbents makes it a better alternative to the non biodegradable synthetic polymers. Dry unripe plantain peels and groundnut husks were used to prepare the adsorbents. The adsorption and percentage removal of crude oil from effluent produce water was dependent on adsorbent dosage, contact time,temperature and particle size. The particle size of the adsorbents should not be less than 150 μm to avoid making the particles so loosed thus posing difficulty in recovery. The two adsorbents exhibit high affinity for oil adsorption with time especially at 75 μm, groundnut husk has a better performance because of its larger surface area and the presence of residual oil in the plantain peels. Agitation at 150 ***-1 and contact time between 15 - 75 min are recommended. The optimum adsorption temperature ranged between 25°C - 45°C and 15°C - 45°C for groundnut husks and plantain peels respectively. The adsorption data indicated that a pseudo-second- order equation could be used to study the adsorption kinetics of both adsorbents.

关键词： biosorption bio-adsorbents Groundnut Husks Plantain Peels Kinetics

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