One of the methods to overcome lead pollution in water is an adsorption
process. Rice hull would turn to ash and was used as an alternative adsorbent for lead
adsorption. The objective of this research was to examine the kinetics of lead adsorption
onto rice hull ash. The examined variables were the temperature and the weight of
adsorbent. The batch sorption experiments were carried out in the 1 liters stirred glass
vessel contained 5 ppm Pb(NO3
)
2
solution. The weights of rice hull ash introduced into
the vessel were 1 g, 5 g, 8 g and 15 g. The temperatures of solution were 35
o
C, 45
o
C and
55
o
C. The solution samples were taken every 10 minutes until reaching equilibrium and
analyzed for the remaining Pb
2+
by AAS. The results showed that the increase in
temperature reduced the rate of lead adsorption and the increase in weight of adsorbent
accelerated the lead adsorption. It was also found that the Langmuir kinetics model
adequately describes the variation in the adsorption observed in these experiments.
Keywords: lead pollution, rice hull ash, kinetics of adsorption, Langmuir kinetics mode
