Adsorption kinetic models for the removal of Cu(II) from aqueous solution by clay liners in landfills

Abstract

Liners are commonly used in engineered waste disposal landfill to minimize the potential contamination of the aquatic environment. The adsorption behavior of Cu(II) from aqueous solution onto clay admixed with various mix ratios of quarry fines was investigated. The amount of Cu(II) adsorption increases with increase in contact time. The copper removal efficiencies of the composite mixture gradually decrease from 94.53 % (raw clay) to 85.59 % (20 % of quarry fines with clay), and appreciable decrease in percent removal 75.61 % was found with 25 % of quarry fines with clay. The kinetic adsorption data were analyzed by pseudo-first-order, pseudo-second-order, BhattacharyaVenkobachar and Natarajan-Khalaf kinetic models to classify adsorption process mechanisms. Kinetic experimental data were good agreement with pseudo-secondorder kinetic model with the degree of fitness of the data (R 2 ) 0.9999 for the adsorption of Cu(II). The results revealed that quarry fines can be used with optimum of 20 % replacement of natural clay for removal of Cu(II) as a liner material in landfills.

Adsorptive removal of recalcitrant organic compounds of compost leachate by epichlorohydrin cross‐linked cyclodextrin copolymer

“…It is necessary to determine the adsorption properties, the adsorption rate, and the adsorption mechanism. [ 54 ] It was investigated using different kinetics models, including pseudo‐first order (PFD), pseudo‐second order (PSD), intraparticle diffusion (IDF), and Elovich models. The linear forms of PFD and PSD models were employed using Equations () and (), respectively.…”