Abstract
Adsorption capacity of the two adsorbents was investigated as a function of contact time between adsorbent and heavy metal ions solutions, the initial heavy metals concentration of the synthetic wastewater, pH value, temperature and adsorbent mass. Preliminary experiments at different pH values between 2.0 and 7.0 were performed, and were observed that maximum adsorption occurs at pH 5 for copper (q(max) = 92.59 mg · g(–1)), 6.0 for lead (qmax = 97.08 mg · g(–1)) and 6.5 for zinc ions (q(max) = 73.52 mg · g(–1)), respectively. The sorption capacity of studied adsorbents for Pb(2+), Cu(2+) and Zn(2+) was calculated using Langmuir and Freundlich models. Thermodynamic parameters – enthalpy change (ΔH(0)), entropychange (ΔS(0)) and free energy (ΔG(0)) – were calculated for predicting the nature of adsorption. Scanning electron micrograph(SEM) revealed changes in the surface morphology of the adsorbent as a result of heavy metal ions adsorption.EDS characterization confirmed qualitatively the presence of adsorbed species in the samples. On the basis of the obtained results the adsorption it was proposed an ordered adsorption: Pb(2+), Cu(2+) and Zn(2+), on the sorbents we investigated.
Highlights
IntroductionHeavy metals are present in aqueous waters wastes of many industries, such as nonferrous metal industry, metal plating, mining operations, paint industry, oil refining, radiator manufacturing, smelting, plastic industries, storage batteries industries, etc
Heavy metals are present in aqueous waters wastes of many industries, such as nonferrous metal industry, metal plating, mining operations, paint industry, oil refining, radiator manufacturing, smelting, plastic industries, storage batteries industries, etc.The removal of heavy metals from contaminated water represents a major research subject due to the toxicological aspects
The concentration of heavy metal ions in aqueous solution after sorption experiments was determined by flame atomic absorption spectroscopy (FAAS) on a continuum source atomic absorption ContrAA ® –300 device equipped with an Echelle double monochromator with a high resolution
Summary
Heavy metals are present in aqueous waters wastes of many industries, such as nonferrous metal industry, metal plating, mining operations, paint industry, oil refining, radiator manufacturing, smelting, plastic industries, storage batteries industries, etc. Various physical and chemical treatment processes such as chemical precipitation,[4,5] ion exchange,[6,7] membrane filtration,[8] coagulation, and adsorption[9,10,11,12] have been widely used to reduce heavy metal content from industrial wastewaters. Most of these methods have several disadvantages, such as complicated treatment process, energy consumption, and are expensive. The present investigations regard two adsorbents: montmorillonite-K10 and aluminium-pillared clay removal ability of Pb2+, Cu2+, and Zn2+ ions from synthetic wastewaters
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