20 / 25
allied
academies
Page 70
Journal of Industrial and Environmental Chemistry
|
Volume 2
GREEN CHEMISTRY &
TECHNOLOGY
7
th
International Conference on
J u n e 1 8 - 2 0 , 2 0 1 8 | D u b l i n , I r e l a n d
DETERMINATION AND REMOVAL OF COPPER AND CADMIUM IN
DRINKING WATER SAMPLES COLLECTED FROM JIMMA TOWN,
SOUTH-WEST ETHIOPIA, USING ACTIVATED CARBON PREPARED
FROM PUMPKIN SEEDS
Khalid Siraj
Jimma University, Ethiopia
T
his study was designed for the determination and removal of heavy metal contaminants in drinking water samples
collected fromJimma town, SouthWestern Ethiopia using chemically activated carbon prepared frompumpkin (
Telfairia
occidentalis
) seed. The activation was done by heating the mixture in an electrical furnace at 800oC for 3 hrs. Three types
of drinking water samples (untreated, treated and distributed) had been collected from six different sites having a total
of about twenty one samples. Two heavy metals, copper and cadmium had been studied and their concentration in some
of the water samples was found to be (0.3 mg/L for Cu (II) and 0.0072 mg/L for Cd (II)) which was above the maximum
permissible levels (MPL) compared to World Health Organization (WHO) limit that is 0.2 mg/L and 0.005 mg/L for copper
and cadmium respectively. Adsorption experiments were carried out as a function of pH, contact time, initial Cu (II) and Cd
(II) ion concentrations, adsorbent dosage and temperature of the solution for the removal of the ions. The equilibrium data
better fitted to the Langmuir isotherm model for studying the adsorption behavior of the ions with correlation coefficient
(R2) of > 0.999. Kinetic studies of the data showed that the adsorption follows the pseudo-second order kinetic model.
Thermodynamic parameters ∆G, ∆H, and ∆S for the uptake of Cu (II) and Cd (II) ions were calculated suggesting that
adsorption on the surface of activated carbon was non spontaneous and feasible; and endothermic between temperatures
of 25
o
C and 45
o
C.
J Ind Environ Chem 2018, Volume 2 | DOI: 10.4066/2591-7331-C1-003