Studies on the Adsorption Efficiency of Activated Carbon for Pesticide Vapour: Brief Overview | Chapter 6 | Theory and Applications of Chemistry Vol. 4
Chlorpyrifos pesticides are endocrine disruptors, inhibitors
of acetyl cholinesterase, used to control pests and prime contributors to
indoor pollution in retail stores. Seven selected locally sourced adsorbents;
Bone charcoal (BCA), corncobs, cotton seed, kokoli, sawdust, coconut shell
(CSA) and Muruchi were evaluated. Only BCA and CSA shows peaks and were further
examined at adsorptive temperatures of 283, 293, 303 and 313K. Adsorbents
physical properties that is, micro pore surface area, total pore volume; micro
pore volume, particle density and true density were measured and compared.
Results from gas chromatography and surface characterization revealed that the
adsorptive capacities of carbon (CSA) at various temperatures were higher than
that of carbon (BCA). The plots of Langmuir and Freundlich Isotherms were well
fitted by the measured adsorption data. The parameters of adsorption equation
for both Langmuir and Freundlich were determined for the two adsorbents, which
indicates increased values of adsorptive capacity at low temperature and
decreases at high temperature. This study shows that activated carbon made from
coconut shell has high surface area, micro porous structure, high degree of
surface reactivity and higher heterogeneous properties that suggest it to be a
better adsorbent sufficient for the adsorption of chlorpyrifos vapour in an
indoor environment.
Author(s)
Details
Dr. A. J. Hotton
National
Agency for Food and Drug Administration and Control, P.M.B. 1018, Jalingo,
Taraba State, Nigeria.
.
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