Sorption of heavy metals using low cost sorbents: alternative method for water treatment

Kamari Azlan, Md Isa Illvas, Hashim Norhayati,

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Type :	monograph
Subject :	QD Chemistry
Main Author :	Kamari Azlan, Md Isa Illvas, Hashim Norhayati,
Title :	Sorption of heavy metals using low cost sorbents: alternative method for water treatment

Place of Production :	Universiti Pendidikan Sultan Idris
Publisher :	Fakulti Sains dan Matematik
Year of Publication :	2013
Corporate Name :	Universiti Pendidikan Sultan Idris

Abstract : Universiti Pendidikan Sultan Idris

Coconut dregs, soya dregs and lala clam shells have been used as low cost sorbents for the removal of heavy metals from aqueous solution. The effect of pH, contact time, initial metal concentration and temperature on sorption process was studied in batch experiments. Results of the equilibrium experiments showed that the solution pH was the key factor affecting the sorption characteristics. The kinetics data were best described by pseudo-second order, while the equilibrium data were best fitted by Langmuir isotherm. The thermodynamic studies indicated that the sorption is spontaneous and endothermic. Desorption studies showed that heavy metals are retained on the sorbents' surface following interaction with eluents. FTIR analysis confirmed that 0- and N-containing functional groups are the main sorption sites in coconut dregs and soya dregs. The presence of calcium carbonate in lala clam shells favours ion exchange mechanism. Based on effectiveness study using industrial wastewater, it can be concluded that coconut dregs, soya dregs and lala clam shells have a higher sorption capacity for Pb(II), Cu(II) and Ni(II) ions as compared to mangrove derived activated carbon.

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