Equilibrium and kinetic studies of various heavy metals on sugarcane

Cong Liu, Huu Hao Ngo, Wenshan Guo

 

ABSTRACT

Equilibrium and kinetic studies of copper (Cu), zinc (Zn) and lead (Pb) on sugarcane bagasse were investigated in a batch mode. There is an increase in adsorption with increase in contact time and maximum adsorption takes place at 1 h and again after 1 h contact time there was no further adsorption. Therefore, biosorption equilibrium was reached within 60 min. It has also been found out that most of the heavy metal removal occurred in the first 10 min. Equilibrium was reached within 60 min and optimal time for biosorption process was between 1 to 10 minutes from an economic perspective. Biosorptive capacity of Cu, Zn and Pb was determined to be 10.64 mg/g, 4.05 mg/g and 122.75 mg/g, respectively. Three adsorption isotherms were analyzed and obtained results followed Redlich-Peterson adsorption isotherm. Non-linear models were also evaluated and exhibited a better fitness. Furthermore, four kinetic models were applied and pseudo second-order kinetic model was found in satisfactory accordance with obtained data.

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doi:10.11912/jws.2015.5.2.59-73