Bioremediation potential of microalgae for copper ion from wastewater and its impact on growth and biochemical contents: equilibrium isotherm studies

Abstract

In this study, the green microalgae Chloroidium ellipsoideum and Desmodesmus subspicatus were used to study copper uptake from nutrient media and its effect on algal growth and metabolism. The growth of C. ellipsoideum and D. subspicatus generally decreased with increasing copper concentrations. There was a decrease in the carbohydrate content of C. ellipsoideum , but an increase was observed in D. subspicatus by treatment with various copper concentrations. Low concentrations of copper helped to increase the protein content of C. ellipsoideum , but a decline in protein content was reported for D. subspicatus. By increasing the copper concentrations, an increase in the free amino acids and a decrease in the total lipid content of C. ellipsoideum and D. subspicatus were recorded. At 0.1 mgl–1,the maximum reduction of Cu2+ was 68.66% and 59.52% for C. ellipsoideum and D. subspicatus. The Langmuir, Freundlich, Temkin and Dubinin–Radushkevich models were applied to describe the isothermal biosorption of Cu2+ ions in studied algae. The Dubinin–Radushkevich model indicated that the copper biosorption mechanism was physical in nature. Cu2+ has a greater affinity for D. subspicatus than C. ellipsoideum , suggesting that C. ellipsoideum was relatively more resistant to Cu2+ toxicity than D. subspicatus. FT-IR analysis revealed that carboxyl, amide, amino, carbonyl, hydroxyl, methyl and alkyl groups were the key groups responsible for the biosorption process. Therefore, D. subspicatus and C. ellipsoideum are efficient biosorbents for Cu2+ and can be used as biosorbents for heavy metals removal from wastewater.

Silver nanoparticles alleviate the impact of soil contamination and wastewater irrigation on rosemary plants: modulating of gene expression and secondary metabolites

“…The spectrum of ATR-FTIR was shown in (figure 2). In the FTIR peaks, a variable band corresponding to the N-H/O-H stretching of carboxylic acids was detected at 3274 cm −1 [25]. It is possible to explain the bands detected at 1636 to the stretching energies of -C = C (alkenes) [26].…”