Biosorption of Strontium from Simulated Nuclear Wastewater by Scenedesmus spinosus under Culture Conditions: Adsorption and Bioaccumulation Processes and Models

Abstract

Algae biosorption is an ideal wastewater treatment method when coupled with algae growth and biosorption. The adsorption and bioaccumulation of strontium from simulated nuclear wastewater by Scenedesmus spinosus were investigated in this research. One hundred mL of cultured S. spinosus cells with a dry weight of 1.0 mg in simulated nuclear wastewater were used to analyze the effects on S. spinosus cell growth as well as the adsorption and bioaccumulation characters under conditions of 25 ± 1 °C with approximately 3,000 lux illumination. The results showed that S. spinosus had a highly selective biosorption capacity for strontium, with a maximum bioremoval ratio of 76%. The adsorbed strontium ion on cell walls was approximately 90% of the total adsorbed amount; the bioaccumulation in the cytoplasm varied by approximately10%. The adsorption quantity could be described with an equilibrium isotherm. The pseudo-second-order kinetic model suggested that adsorption was the rate-limiting step of the biosorption process. A new bioaccumulation model with three parameters was proposed and could give a good fit with the experiment data. The results suggested that S. spinosus may be a potential biosorbent for the treatment of nuclear wastewater in culture conditions.

Selective Uptake of Alkaline Earth Metals by Cyanobacteria Forming Intracellular Carbonates

“…24 Several organisms able to trap Sr and/or Ba have been discovered, including some bacteria, micro-algae and plants. 11,[25][26][27][28][29][30][31][32][33][34][35] Different mechanisms of sequestration may be involved. First, Sr 2+ and Ba 2+ may be adsorbed on the cell surface.…”

Contribution of surface functional groups and interface interaction to biosorption of strontium ions by Saccharomyces cerevisiae under culture conditions

“…The biosorption of strontium ions has been carried out with different biomasses. [1][2][3][4][5][6] However, the mechanism underpinning the biosorption interface interaction is not fully understood, particularly with respect to following points. (1) Electrostatic interaction and ion exchange: electrostatic interactions are thought to exist in many instances of biosorption for heavy metals.…”

Removal Orange G Dye From Aqueous Solutions Using Graphene Oxide/Magnesium Oxide Nano Composite

“…Several adsorption experiments in (25-125) min of contact time range were performed and the results were shown in Fig.14. The removal rate of dye onto GO/MgO NCs gradually increased with the increase of contact time from 25 to 125 min and then remained constant 28 with further increase in contact time; therefore, a period of 125 min of equilibrium was selected for the next studies. In the initial stage, dye contact quickly with a lot of available active sites on the surface of GO/MgO NCs, resulting in the occurrence of the fast adsorption with increase of the contact time, the available active sites gradually lessened and the driving force weakened, leading to the slow adsorption process and taking long time to achieve adsorption equilibrium.…”