2019 Volume 56 Issue 3 Pages 136-141
The purpose of this study is to clarify the zinc removal mechanism by a natural component of organic soils, namely leaf mold and construct quantitative model. We performed batch removal experiments at different concentrations of zinc in the range 10–50 mg/dm3. The dosage of leaf mold was also changed up to 20 g/dm3. The obtained results highlighted that sorption isotherm showed a Langmuir type for each initial concentration of zinc. X-ray absorption fine structure analysis revealed that atomic arrangement of leaf mold was not changed between before and after zinc removal experiments. From above results, it was confirmed that the zinc removal mechanism by leaf mold was surface complexation formation. Based on the experimental results, we constructed a quantitative model incorporating surface complexation by leaf mold. The pH edge for Zn(II) removal by leaf mold was successfully represented by the quantitative model.
