Scholarly record
RECOVERY OF ZINC FROM K-FELDSPAR BY SAPONIN BIOSURFACTANT
Abstract
Heavy metal contamination of soils possess a serious health threat and has become one of the major constraining factors in remediating a wide range of contaminated sites. Soil contains various components such as clay, kaolin, feldspar, quartz, etc. Soil composition (type of soil), soil pH, cation exchange capacity (CEC), particle size, time and type of contamination, geological layout, etc. all play a major role in establishing the effectivenes of biosurfactant. In this study, the effects of saponin concentration, pH, and the amount of Zn(II) loaded to K-feldspar on the removal of Zn (II) ions from Kfeldspar by saponin biosurfactant were investigated. To investigate Zn(II) complexation by saponin firstly K-feldspar sorbed Zn(II) ions. The highest Zn (II) sorption efficiency on K-feldspar was obtained as 59.5\%. To determine the effect of pH on the desorption efficiency of Zn(II), pH was varied between 3.0 and 7.0 and maximum Zn(II) recovery efficiency was obtained at pH 4.0 as 88\%. As the concentration of saponin was increased from 0.1\% to 10\%, the optimum saponin concentration was found as 3\%. As the concentration of Zn(II) loaded to K-feldspar was increased from 2.55 to 9.63 mmol Zn (II)/kg K-feldspar, maximum Zn(II) desorption efficiency was 62.85\% of the sorbed Zn(II) at 5.35 mmol Zn (II)/kg K-feldspar, at 3\% saponin concentration and at pH 5.
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References11
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