Cadmium biosorption on Spirulina platensis biomass

Area of Science:

• Environmental Science
• Biotechnology
• Water Treatment

Background:

• Cadmium(II) is a toxic heavy metal pollutant in water.
• Biosorption offers a sustainable method for heavy metal removal.
• Spirulina platensis biomass is a potential low-cost biosorbent.

Purpose of the Study:

• To evaluate Spirulina platensis biomass as a biosorbent for cadmium(II) removal.
• To investigate the effect of biosorbent and metal concentrations on cadmium removal efficiency.
• To analyze the kinetics and adsorption capacity of the biosorption process.

Main Methods:

• Dry Spirulina platensis biomass was re-hydrated for 48 hours.
• Biosorption experiments were conducted using varying biomass (1-4 g/L) and cadmium(II) concentrations (100-800 mg/L).
• Removal efficiency, kinetics, and adsorption capacity were analyzed.

Main Results:

• Up to 98% cadmium(II) removal was achieved at lower metal concentrations (100-200 mg/L) with 2 g/L biomass.
• Higher biomass concentrations (up to 4 g/L) were required for effective removal of higher metal concentrations (up to 500 mg/L).
• Increasing biomass concentration increased the rate constant but decreased adsorption capacity from 357 to 149 mg/g.

Conclusions:

• Spirulina platensis biomass is an effective biosorbent for cadmium(II) removal.
• Optimizing biomass and metal concentrations is crucial for efficient cadmium removal.
• The study provides insights into the biosorption kinetics and capacity for practical water treatment applications.