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Keywords
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: adsorption, heavy metal, kinetic behavior, activated carbon, Luffa Cylindrica
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Abstract
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One of the main issues in environmental management is the removal of heavy metal ions from the
effluent, which was the aim of this study. For this purpose, hydrolyzed Luffa carbon (HLC) and
Luffa activated carbon (LAC) were prepared through two different methods from Luffa Cylindrica
biopolymer and used as a potential adsorbent to remove lead (II) heavy metal ions from aqueous
solution. FT-IR analysis was used to characterize the prepared adsorbents, and the results showed
that presence of abundant functional groups such as O-H and C-S strongly affect the heavy metal
ion adsorption. The effect of contact time and kinetic studies was investigated at the initial pH of 6
and in the batch system. The results indicated that the maximum removal rate of 98% and 95% for
HLC and ACL occurs in 60 and 80 minutes, respectively. The pseudo-second-order kinetic model
was well fitted with the experimental data, indicating that chemical bonds are established between
the pollutant ions and adsorbent surface. Kinetic studies also revealed that HLC was more inclined
to adsorb heavy metal ions compared to ACL.
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