A Prominent Streptomyces sp. Biomass-Based Biosorption of Zinc (II) and Lead (II) from Aqueous Solutions: Isotherm and Kinetic.

Traditional freshwater sources have been over-abstracted in the worldwide crisis of water scarcity. Effluents have extremely high amounts of Zn²⁺ and Pb²⁺, according to an investigation of wastewater samples taken from several industrial zones. However, these heavy metals are among the most harmful to both humans and wildlife that are currently known. Streptomyces sp. is utilized in this study as a biosorbent to biosorb Zn²⁺ and Pb²⁺ from single and binary aqueous solutions. Several factors, such as biomass concentration (0.25–4 g), metal solution concentration (5–50 mg L⁻¹), solution pH (2–5), and contact time were standardized. Streptomyces sp. biomass was able to extract 93% Pb²⁺ and 91% Zn²⁺ from a single and 95% Pb²⁺ and 97% Zn²⁺ from a binary metal aqueous solution containing 25 mg L⁻¹ and pH 4. The highest adsorption capacity in both single and binary sorption experiments was determined to be shared by Zn²⁺ and Pb²⁺. The biosorbent's metal adsorption increased from 0.48 to 4.56 mg g⁻¹ for Pb²⁺ and from 0.21 mg g⁻¹ to 4.65 mg g⁻¹ for Zn²⁺ when the metals were present singly, and from 0.44 to 4.18 mg g⁻¹ for Pb²⁺ and from 0.41 mg g⁻¹ to 5.67 mg g⁻¹ for Zn²⁺ when the metals were present in binary form. The amount of metal ions was raised from 5 to 50 mg L⁻¹. Correlation coefficient (R²) values indicate that the adsorption pattern for Zn²⁺ and Pb²⁺ followed Freundlich isotherm R² > 0.9543 for single and 0.9582 for binary sorption system. In order to remove Zn²⁺ and Pb²⁺ from an aqueous solution, Streptomyces sp. is a potential and different source of adsorbents. [ABSTRACT FROM AUTHOR]