Copper biosorption by Myriophyllum spicatum: Effects of temperature and pH

Abstract

Using submerged aquatic plants is a cheap and clean technique to remediate heavy metal water pollution at low concentrations. Biosorption of Cu(II) ions by fresh tissues of Myriophyllum spicatum, a submerged aquatic plant, was characterized in an artificial solution system under different values of contact time, temperature and pH in this paper. Cu(II) biosorption was fast and equilibrium was attained within 20 min. The equilibrium biosorption data were analyzed using three widely applied isotherm models: Langmuir, Freundlich and Redlich-Peterson isotherm. Langmuir isotherm parameters obtained from the three Langmuir linear equations by using linear method were dissimilar, except when the non-linear method was used. Best fits were yielded with Langmuir and Redlich-Peterson isotherms (R 2 =0.961-0.992 and 0.990-0.998, respectively). The saturated monolayer biosorption capacity of M. spicatum for Cu(II) at 298 K was calculated to be 0.19 mmol/g. The biosorption capacity of M. spicatum for Cu(II) increased with increasing pH, and the resulting isotherms were well described by Langmuir and extended Langmuir models (R 2 =0.931-0.993 and 0.961, respectively). The comparison of calculated q e and experimental q e values showed that the extended Langmuir model had a better simulation for Cu(II) biosorption by M. spicatum than the Langmuir isotherm model. FT-IR was used to characterize the interaction between M. spicatum and Cu(II), with the results indicating that carboxyl groups played an important role in Cu(II) binding.

Biosorption of cadmium ions using Pleurotus ostreatus: Growth kinetics, isotherm study and biosorption mechanism

“…The aforestated shifts provide indication that the acidic groups, carboxyl and hydroxyl are predominant contributors in chitin-cadmium complex. Li et al [30] suggest that on the basis of variations of the bands, peak values of FTIR spectra indicate the prevalence of chelating characteristics of metal biosorption onto carboxyl groups and this affords further evidence on the complexation mechanism proposed in our study.…”

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

“…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]. Other studies of lead sorption with the same macrophyte show that after 10 minutes, 66% of lead cations present in initial solution were sorbed, whereas in dynamic equilibrium achieved after 20 minutes, 85% of Pb cations were sorbed [28].…”

“…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)

“…Inflorescence and seed production are common. It can be found all the year round in the water (Aiken et al 1979;Li et al 2010). Water pollution is one of the serious environmental problems originated from the overpopulation, urbanization, industrialization and ignorance (Satya et al 2011).…”