Abstract
The removal of textile dyestuff from waste water was investigated in a batch sorption process using shea nut (Vitellaria paradoxa) shell activated carbon. The data were tested using the Rudishkevich – Dubinin and Temkin isotherm models. The result showed that removal efficiency increases with increase in contact time. This critical study which utilizes these more recent adsorption isotherms was found to present the mean free energy values (ED =1.036 – 1.406 kJmol-1) as a direct proportionality to the theoretical saturation capacities (qD = 2.032 – 4.169mgg-1). Sorption energy values proves to be higher for biosorbent, SS/A/15 (1.364 KJmol-1) ,which also gave the corresponding higher adsorption capacity (4.169 mgg-1) than the other three biosorbent in the series. A thermodynamic parameter (ΔG) was investigated to be more negative with sorbent – dye contact time, within the equilibration limit. The Close similarities of analytical results to those reported in reviewed literature, and the good degree of adsorption is an indication that using shea nut shells as a low cost biomass for generating activated carbon could be a feasible outlet in bioremediation. @JASEMJ. Appl. Sci. Environ. Manage. December, 2010, Vol. 14 (4) 163 - 168
Highlights
Activation carbon have been produced from a large number of carbonaceous raw materials such as coal, lignite, wood, coconut shell and some agricultural waste products (Guo and Lua, 1998) and animals sources (Itodo et al, 2008)
According to Monika et al, 2009, physisorption is one where the mean free energy value ED < 8KJmol-1, this paper presented ED values of the range, 1.035 – 1.406 KJmol-1
This study revealed that sorbent of high sorption energy (B) presented a corresponding high saturation capacity while carbon, activated at longer dwell time gave Biosorbents of high mean free energy values
Summary
Activation carbon have been produced from a large number of carbonaceous raw materials such as coal, lignite, wood, coconut shell and some agricultural waste products (Guo and Lua, 1998) and animals sources (Itodo et al, 2008). The effectiveness of activated carbon as an adsorbent is attributed to its unique properties including large surface area, high degree of surface reactivity, universal adsorption effect, and favorable pore size (Zahangir et al, 2008; Ozer et al, 2005)
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