Application of live Chlorococcum aquaticum biomass for the removal of Pb(II) from aqueous solutions
- PDF / 643,681 Bytes
- 12 Pages / 595.276 x 790.866 pts Page_size
- 106 Downloads / 262 Views
Application of live Chlorococcum aquaticum biomass for the removal of Pb(II) from aqueous solutions L. M. M. Liyanage 1 & W. G. M. Lakmali 2 & S. N. P. Athukorala 2 & K. B. Jayasundera 3 Received: 10 February 2020 / Revised and accepted: 19 August 2020 # Springer Nature B.V. 2020
Abstract Microalgae readily develop tolerance against environmental pollutants and are also capable of utilizing heavy metals in their metabolic activities. Microalgae-based heavy metal removal provides an eco-friendly, cost-effective technology to treat wastewater. In this study, a strain of the green alga Chlorococcum aquaticum, isolated from water polluted with Pb2+, was selected for bioremediation of Pb2+ in aqueous solutions. Chlorococcus aquaticum showed a high level of tolerance toward Pb2+ with an LC50 of 100 mg L−1. To assess the efficacy and practicality of the bioremediation process, adsorption isotherms and kinetic models were developed. The best-fitted adsorption model was Freundlich isotherm with the adsorption constant (KF) = 2.18 mg g−1 and n = 1.01, suggesting a multilayer adsorption to heterogeneous surfaces. The kinetic studies revealed that the interaction of Pb2+ with C. aquaticum obeys pseudo second-order kinetics with the rate constant (k′) = 1.21 × 10−5 g mg−1 min−1 and the amounts of Pb2+ adsorbed per gram of adsorbent at equilibrium (qe) = 500 mg g−1, indicating that the rate determining step involves a chemical reaction mechanism. Chlorococcum aquaticum showed a high tolerance toward Pb2+, high adsorption capacity and a moderate adsorption rate. Thus, growing C. aquaticum can be identified as a potential environmentally friendly and low-cost sorbent to remove a wide range of Pb2+concentrations from wastewater. Keywords Biosorption . Chlorococcum aquaticum . Chlorophyceae . Lead(II) . Adsorption isotherms . Kinetic studies
Introduction Inadequately treated effluents pollute natural water with various inorganic and organic compounds, heavy metals, sewage, pathogens, detergents, and dyes (Høibye et al. 2008; Von Sperling 2015; Crini and Lichtfouse 2019). Among these pollutants, heavy metals have drawn considerable attention over the years due to their toxicity on all living organisms. Lead (Pb) is the fifth most industrially used heavy metal after Fe, Cu, Al, and Zn due to its exceptional qualities such as high Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10811-020-02242-w) contains supplementary material, which is available to authorized users. * K. B. Jayasundera [email protected] 1
Postgraduate Institute of Science, University of Peradeniya, Peradeniya, Sri Lanka
2
Department of Botany, Faculty of Science, University of Peradeniya, Peradeniya, Sri Lanka
3
Department of Chemistry, Faculty of Science, University of Ruhuna, Matara, Sri Lanka
degree of ductility and low corrosiveness (Wuana and Okieimen 2011). Lead is known to exert severe toxic effects on animals (Wani et al. 2015; Assi et al. 2016; Kumar et al. 2020) and plants (Gill 2014; Küpper 2017
Data Loading...
