抄録
Liners play an important role in minimizing migration of contaminants in landfill engineering. Adsorption studies were carried out in order to assess the suitability of local materials with additives as liners .The red soil along with admixtures has been found to retain heavy metals and alkali metals effectively. For different dilution ratios, it was found that adsorption efficiency decreases with increasing dilution ratio. Empirical adsorption models like Langmuir and Freundlich were applied for the experimental data and both were found to vary linearly. Monolayer sorption capacity was obtained using Langmuir isotherm, which was used to arrive at adsorption rankings for different mixtures. The correlation coefficient varied from 0.9058 to 0.9884 for Langmuir and from 0.9096 to 1 for Freundlich, which suggests that both isotherm models fit very well. Constant pH batch adsorption studies were carried out at pH 4, 6, 8, 10, and 12. It was found that adsorption is pH dependent and maximum adsorption takes place at a pH range of 6 to 8 for all elements, except for hexavalent chromium. Confirmatory tests were done by taking scanning electron microscopy (SEM) images and electron dispersive spectroscopy (EDS) for thorough understanding of soil mineral structure.
