TITLE:
Study of the Adsorption Efficiency of an Eco-Friendly Carbohydrate Polymer for Contaminated Aqueous Solution by Organophosphorus Pesticide
AUTHORS:
Z. Abdeen, Somaia G. Mohammad
KEYWORDS:
Chitosan; Adsorption; Organophosphorous; Pesticide; Contaminated
JOURNAL NAME:
Open Journal of Organic Polymer Materials,
Vol.4 No.1,
December
27,
2013
ABSTRACT: The removal of pesticide (ethoprophos) from aqueous
solution using a natural biosorbent such as chitosan (CH) prepared from a biopolymer
waste obtained from marine industry was studied. The Fourier Transform Infrared Spectroscopy
(FTIR), Scanning electron microscopy (SEM), and X-ray diffraction spectroscopy (XRD)
were used to study the structure of the adsorbent. The biosorption studies
were carried out under various parameters, such as biosorbent dose, initial pesticide
concentration and contact time. The experimental results show that the removal percentage of ethoprophos increased from
85.693% to 89.234%, as adsorbent
dose (CH) increased from 0.02 to 0.1 g/100ml. The equilibrium uptake was increased
with an increase in the initial pesticide concentration in solution. Biosorption
kinetic data were fitted well with the pseudo-second order kinetic model. The experimental
isotherms data were analyzed using Freundlich, Langmuir, Temkin and Dubinin-Radushkevich
(D-R) isotherm equations. The best fit was obtained by Freundlich isotherm with
high correlation coefficients. That the value
of energy calculated from the D-R isotherm was 5.56 KJ/mol suggests the adsorption of ethoprophos on Chitosan is physical.
All the results indicating CH was chosen as low-cost biosorbent could be applied
for the removal of organophosphorous
pesticide from aqueous solutions.