The percentage of cadmium ions removal using banana peel
at different particle sizes are shown in Fig 1. It was seen that the
influence of the particle size was similar at different solution pH
ranging from 2 to 6. The particle sizes of banana peel had no
effect on the removal of cadmium ions. The higher biosorption
level achieved by smaller particle size of the biosorbents may not
be connected to the fact that smaller particle sizes give large
surface areas. There was tendency that smaller particle sizes
produce shorter time to equilibrate [11]. Although this is contrary
to expect for an intrapaticle diffusion controlled process, it is
The 18h Thailand Chemical Engineering and Applied Chemistry Conference October 20-21,2008,Pattaya Thailand
necessary to point out that the two sizes of biomass are actually
of the same thickness (dimension which determines the diffusion
distance). This is due to size grading of ground biomass particle
by standard sieves works on the length and width dimensions
[12]. The behavior has been reported by others [13], although
Leusch et al. 1995 [14] showed that larger biomass particles of
Sargassum fluitans and Ascophylum nodosum had higher metal
uptake than smaller particles in the case of cadmium, copper,
nickel, lead and zinc. Then, the influence of biosorpbent size on
metal uptake seems to be function of both the type of biomass
and the metal ion.
The percentage of cadmium ions removal using banana peelat different particle sizes are shown in Fig 1. It was seen that theinfluence of the particle size was similar at different solution pHranging from 2 to 6. The particle sizes of banana peel had noeffect on the removal of cadmium ions. The higher biosorptionlevel achieved by smaller particle size of the biosorbents may notbe connected to the fact that smaller particle sizes give largesurface areas. There was tendency that smaller particle sizesproduce shorter time to equilibrate [11]. Although this is contraryto expect for an intrapaticle diffusion controlled process, it is The 18h Thailand Chemical Engineering and Applied Chemistry Conference October 20-21,2008,Pattaya Thailandnecessary to point out that the two sizes of biomass are actuallyof the same thickness (dimension which determines the diffusiondistance). This is due to size grading of ground biomass particleby standard sieves works on the length and width dimensions[12]. The behavior has been reported by others [13], althoughLeusch et al. 1995 [14] showed that larger biomass particles ofSargassum fluitans and Ascophylum nodosum had higher metaluptake than smaller particles in the case of cadmium, copper,nickel, lead and zinc. Then, the influence of biosorpbent size onmetal uptake seems to be function of both the type of biomassand the metal ion.
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