Effects of nitrogen depletion on the biosorption capacities of Neochloris minuta and Neochloris alveolaris for five heavy metals
Giarikos, Dimitrios G. | Brown, Jessica | Razeghifard, Reza | Vo, Duy | Castillo, Ammy | Nagabandi, Nikhil | Gaffney, Justin | Zelden, Miriam | Antakshinova, Anna | Rodríguez, Sara | Muhammad, Safiyah
Neochloris minuta and Neochloris alveolaris grown in nitrogen-rich (+ N) and nitrogen-depleted (-N) media were tested for their heavy metal maximum biosorption capacities (qₘₐₓ) and adsorption percent efficiencies (R%). By removing nitrogen from the growth media, both algal species showed an increase in their lipid content and a decrease in their protein content. Langmuir and Freundlich adsorption isotherms were used to determine the qₘₐₓ and adsorption efficiencies of the + N and −N algae in the recovery of Pb²⁺, Cd²⁺, Zn²⁺, Cu²⁺, and Ni²⁺. When comparing the two types of algae, N. alveolaris showed the highest adsorption capacities for all five metals either in + N or -N media. The maximum adsorption efficiency percentage of the lowest concentration metal ions for N. alveolaris was 87.10% for Pb²⁺, 64.98% for Cd²⁺, 59.50% for Zn²⁺, 60.08% for Cu²⁺, and 50.61% for Ni²⁺. In both algae, nitrogen depletion (-N) caused an increase in the qₘₐₓ values for Zn²⁺ and Cu²⁺. Additionally, the qₘₐₓ of N. minuta for Cd²⁺, Zn²⁺, Cu²⁺ and Ni²⁺ increased by the nitrogen depletion demonstrating that the treatment can be applied to improve the biosorption capacity of a particular alga for multiple heavy metals. The biosorption capacity for these algae for heavy metals was also discussed in terms of their biomass compositions and the type of hard or soft metal acid based on the Pearson theory of Hard and Soft, Acid and Bases (HSAB).
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