Eco-friendly nanocomposite of manganese-iron and plant waste derived biochar for optimizing Pb2+ adsorption: A response surface methodology approach
This study utilized Central Composite Design to optimize Pb²⁺ removal from aqueous solutions using a nanocomposite of manganese-iron (Mn-Fe) and biochar derived from Conocarpus pruning waste (C. biochar). The effects of Pb²⁺ concentration (20–70 mg/L), adsorbent dose (0.1–0.4 g), and solution pH (3–...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-04-01
|
| Series: | Desalination and Water Treatment |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1944398625001079 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | This study utilized Central Composite Design to optimize Pb²⁺ removal from aqueous solutions using a nanocomposite of manganese-iron (Mn-Fe) and biochar derived from Conocarpus pruning waste (C. biochar). The effects of Pb²⁺ concentration (20–70 mg/L), adsorbent dose (0.1–0.4 g), and solution pH (3–10) on removal efficiency were assessed through polynomial regression modeling and response surface methodology. Fourier-transform infrared spectroscopy revealed functional group interactions and chemical changes on the biochar surface due to Pb²⁺ adsorption, including the involvement of hydroxyl and carboxyl groups. Scanning electron microscopy and energy-dispersive X-ray spectroscopy confirmed morphological alterations and Pb²⁺ incorporation, with Mn-Fe modification enhancing surface roughness and adsorption sites. The optimal adsorption conditions achieved 99.9 % Pb²⁺ removal at pH 7, a 0.6 g adsorbent dose, and an initial Pb²⁺ concentration of 20 mg/L within 30 minutes. Adsorption mechanisms involved ligand bonding, electrostatic interactions, pore filling, and redox stabilization facilitated by Fe and Mn oxides. Isotherm models indicated monolayer adsorption (Langmuir) at lower concentrations, transitioning to multilayer adsorption (Harkin Jura) at higher concentrations. Kinetic studies demonstrated that the pseudo-second-order model best described the chemisorption process, while intraparticle diffusion played a significant role. This comprehensive study advances the understanding of Pb²⁺ adsorption mechanisms and provides valuable insights for developing efficient biochar-based adsorbents for wastewater treatment applications. |
|---|---|
| ISSN: | 1944-3986 |