Hashim, Mohd Akmal
(2008)
Adsorption of cadmium and zinc onto
Stenochlaena palustris
(Paku Midin) : potential agent for removal or
recovery in aqueous solutions.
Other.
Pusat Pengajian Sains Perubatan, Universiti Sains Malaysia.
(Submitted)
Abstract
The ability of Stenochlaena palustris (Paku Midin) to remove Cadmium and Zinc
from aqueous solution by adsorption was studied. The effects of Contact Time, pH and
temperature of the solution, initial metal concentration prior to loading, presents of other
metal ions, and adsorbent size/dose were studied in batch experiments . For this study, the
weight and size of the adsorbent material were fixed. The weight of the adsorbent material
used were set at 0.5 gram and size of#l20 based on the use Screen sieves. The initial metal
concentration are also been fixed at I ppm and 2ppm for Zinc and Cadmium respectively.
The results have shown that the leaves of Paku Midin can adsorp Cadmium up to 86.83
percent at 75 minutes contact time, while the stems can adsorp 83.36 percent at 30
minutes. After 30 and 75 minutes, the adsorption capacity of the adsorbent has shown
reduction value, which indicate that 30 minutes and 75 minutes are the optimum contact
time for Paku Midin stems and leaves respectively. However, the adsorbent was
uneffective against Zinc adsorption or in other words the adsorbent cannot adsorp Zinc
from the aqueous solution that have been prepared. For pH effect analysis, the leaves
seems to show higher capacity of Cadmium adsorption at acidic or basic pH conditions,
but less effective in near neutral pH condition. As for the stem of Paku Midin, adsorption
of Cadmium seems to be better at pH below and above 5. For temperature study, the
results has shown that both Paku Midin stems and leaves are more effective at higher
temperature condition .
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