Abstract
ABSTRACT The aim of the current research is to eliminate the Cu(II) ions from aqueous solution using biochar, namely sulphuric acid-modified Annona reticulata seeds (SMARS). The removal process followed the Freundlich and pseudo-first-order models. At optimum conditions, Langmuir adsorption capacity of the SMARS for Cu(II) ions was calculated as 561.1 mg/g. The results of this work indicate that the adsorption was feasible, spontaneous and exothermic, which was controlled by film diffusion. An adsorber has been designed based on Freundlich model. Desorption results indicate that 0.2 N of the hydrochloric acid solution provides the maximum elimination of heavy metals from the Cu(II) ions loaded adsorbent. The column influencing parameters like Cu(II) ions concentration, bed height and flow rate have been experimented. The best operating condition for removal of Cu(II) ions by SMARS in column mode of operation has been recorded as flow rate = 5 mL/min, bed height = 8 cm, adsorbent amount = 16 g, solution pH = 6.0 and at the temperature = 30°C. The column experimental data have been characterised by applying Bed Depth Service Time and Thomas models. The results indicate that the SMARS has exceptional adsorption behaviour in the elimination of heavy metals from the aqueous solution.
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