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ADSORPTION OF NITRATE ON MAGNETIC MICROALGAL BIOCHAR
Abstract
The presence of nitrate concentration in drinking water can cause high toxicity to the human body, being considered among the most important pollutant in the environment. Among the many methods available such as biological treatment, electrodialysis, reverse osmosis, adsorption, ion exchange, adsorption is the most used technique due to its low cost and simplistic design. Therefore, the aim of this paper was to study the retention of nitrate anion from high concentration aqueous solutions on a novel magnetic adsorbent obtained by pyrolysis of de-oiled microalgal biomass. The prepared adsorbent was characterized by textural analysis (specific surface area, pore volume, average pore diameter, pore size distribution), FT-IR and TGA techniques. The influence of nitrate concentration, pH, retention time and adsorbent mass were evaluated. The equilibrium adsorption data were fitted to three isotherms, namely Langmuir, Freundlich and Temkin. The equilibrium isotherms indicate a pH-dependent behavior, characterized by Temkin model at pH=7 and Freundlich model at pH = 9, respectively. In order to estimate the nitrate removal efficiency multiple linear regressions and artificial neural networks were investigated.
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