Abstract
In this study, the usage of the peppermint (Mentha piperita) for extracting the metal ions [Mg (II), Cr (II), Ni (II), Cu (II), Zn (II), Cd (II), Pb (II)] that exist at water was investigated. In order to analyze the stability properties, Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherms were used at removing the metal ions and the highest correlation coefficients (R2) were obtained at Langmuir isotherm. Therefore, it is seen that the Langmuir model is more proper than the Freundlich model. However, it was found that the correlation coefficients of removing Ni and Cd is higher at Freundlich model than Langmuir and low at Dubinin-Radushkevich isotherm. It is established that the biosorption amount increase depends on the increase of biosorbent and it can be achieved high efficiency (95%) even with small amount (0.6 mg, peppermint extract) at lead ions. It is also determined that the peppermint extracted that is used at this study shows high biosorption capacity for metal ions and can be used for immobilization of metals from polluted areas.
Highlights
Heavy metals mix to the water systems from natural geochemical processes or agricultural, industrial and municipal wastewater
Ambient acidity affects the amount of metal ions biosorption; The optimum biosorption amount for Ni (II) biosorption is pH 6.0 [31]; It is reported that Cd (II) and Pb (II) ions change between optimum pH 3.5 and 5 [32] and Cu (II) has an optimum pH of 6.0 [33]
It was determined that regaining of valuable metal ions (Cr, Ni, Cu, Zn, Cd and Pb) from low concentrated leach solutions and contaminated water is possible by using the extract, obtained from Mentha piperita plant
Summary
Heavy metals mix to the water systems from natural geochemical processes or agricultural, industrial and municipal wastewater. Water-soluble metal ions cause the deterioration of the aquatic ecosystems. The main source for heavy metal pollution of the water is agricultural and municipal wastewater, rainwater flow. The high amount of heavy metals at aqua ecosystems cause potential danger by effecting negatively human and hydro organisms. It is known that as a result of the usage of the lakes and rivers that is polluted with industrial and municipal waste water as agricultural aims, there is important amount of trace element and heavy metal accumulation at soil. The heavy metal ions that penetrate to live systems are reached at high concentration by transforming with food chain from one organism to another and their harm can be remained for years
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