Comparison of the Adsorption Capabilities of Myriophyllum spicatum and Ceratophyllum demersum for Zinc, Copper and Lead

Abstract

Industrial wastewaters contain various heavy metal components and therefore threaten aquatic bodies. Heavy metals can be adsorbed by living or non‐living biomass. Submerged aquatic plants can be used for the removal of heavy metals. This paper exhibits the comparison of the adsorption properties of two aquatic plants Myriophyllum spicatum and Ceratophyllum demersum for lead, zinc, and copper. The data obtained from batch studies conformed well to the Langmuir Model. Maximum adsorption capacities (qmax) were obtained for both plant species and each metal. The maximum adsorption capacities (qmax) achieved with M. spicatum were 10.37 mg/g for Cu2+, and 15.59 mg/g for Zn2+ as well as 46.49 mg/g for Pb2+ and with C. demersum they were 6.17 mg/g for Cu2+, 13.98 mg/g for Zn2+ and 44.8 mg/g for Pb2+. It was found that M. spicatum has a better adsorption capacity than C. demersum for each metal tested. Gibbs free energy and the specific surface area based on the qmax values were also determined for each metal.

The Use of Water Plants in Biomonitoring And Phytoremediation of Waters Polluted with Heavy Metals

“…The maximum sorption capacity is equal to filling all active locations. The authors also point out good correlations between the experimental data and calculations from the model [23,25,28,29]. The equilibrium status is also described by other isotherm models, among others, Freundlich isotherm [38] and Spis isotherm (generalised Freundlich isotherm) [28].…”

“…The results of studies of the sorption from solutions of these metals with volume of 250 cm 3 and initial concentrations of 10 mg/dm 3 show that the time required to achieve dynamic equilibrium is approximately 20 minutes [25]. This was confirmed by other tests on the same plant species [23,26,29]; however, it is emphasised that the equilibrium status during sorption of copper in Myriophyllum spicatum is achieved after 35 minutes [30].…”

“…Mainly the model of the pseudo-second order reaction [23,[25][26][27][28][29][30] and, less frequently, the model of the pseudo-first order (the Lagergren model) [19] is used to describe sorption kinetics. The studies of kinetics aim at establishing the reaction speed constant.…”

“…In the case of bioaccumulation in extra-and intracellular structures, studies of sorption processes can even last several dozen days [38]. The Langmuir isotherm model is mainly used to describe dynamic equilibrium [23,[25][26][27]29]. It assumes the existence of a definite number of active locations, in which sorption of only one chemical substance is possible.…”

Heavy metal accumulation in the leaves, stem and root of the invasive submerged macrophyte Myriophyllum spicatum L. (Haloragaceae): an example of Kadin Creek (Mugla, Turkey)

“…In another study, M. spicatum showed the accumulation of lead from water and the maximum adsorption 46.49 mg kg -1 (Keskinkan et al 2003). The lead adsorption capasities of M. spicatum and Ceratophyllum demersum were compared and it was observed that M. spicatum had better adsorption capacity than C. demarsum (Keskinkan et al 2007). In a study in which cadmium and lead bioaccumulation in Salvinia cucullata plant was analyzed, it was seen that the contents of cadmium and chromium were much more in the roots than in the leaves, as found in this study (Phetsombat et al 2006).…”