Cr(VI) adsorption by Lemna minor considering operational, chemical and biological factors
In: Revue roumaine de chimie: Romanian journal of chemistry, Band 67, Heft 8-9, S. 483-492
The conditions for Cr(VI) adsorption by Lemna minor (LM) were analyzed. Regarding the macrophite the parameters were: growth rate and calcination temperature. Adsorption capacity of LM was measured as a function of the Cr(VI) concentration, stirring contact time, stirring speed, temperature, and pH; as well as considering the quantity of LM units and the LM root length. The data were well adjusted to the kinetic pseudo second order model and to the Langmuir isotherm model. Acid pH enhanced the adsorption because of the negative charge Cr (VI) and the protonated surface of the adsorbent material. Experiments by using a rinse water from the chromium plating process showed that cromium was successfully removed by LM. The best conditions were found for the adsorption process of Cr(VI) by LM.