Journal
CHEMOSPHERE
Volume 307, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2022.135809
Keywords
Phosphate removal; Lanthanum nanoparticles; Water treatment; Magnetic adsorbent; Polyaniline polymer; Isotherm equilibrium
Categories
Funding
- Ministry of Education Malaysia [600-IRMI/FRGS5/3 (416/2019)]
- King Saud University, Riyadh, Saudi Arabia [RSP-2021/407]
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In this study, magnetic polyaniline modified with lanthanum nanoparticles was investigated as an adsorbent for high phosphate-containing aqueous solutions. The experimental results showed that MPANI@La efficiently removed phosphate ions from water and had an appropriate adsorption capacity. The adsorption mechanism was also determined and the proposed adsorption models were validated. Therefore, the proposed adsorbent can be used as an alternative method for environmental water treatment.
Herein, magnetic polyaniline was modified with lanthanum nanoparticles (MPANI@La) as adsorbent, aiming to the treatment of high phosphate-containing aquatic solutions. High valent lanthanum doped with polyaniline was a promising adsorbent to uptake phosphate ions with possible electrostatic interaction and cation exchange process. The functional groups, composition, surface morphology, and magnetic property of the adsorbent were investigated using Fourier Transform-Infrared Spectroscopy (FTIR), Energy Dispersive X-ray (EDX), Scanning Electron Microscopic (SEM), and Vibrating Sample Magnetometer (VSM), respectively. During the experimental process, MPANI@La has removed phosphate ions from water >90%, with 80 mg adsorbent, and shaking for 150 min at room temperature. In this regard, the process was fitted with the Pseudo-second-order kinetic model (R2 > 0.999) and the Langmuir isotherm (R2 > 0.99). The proposed nanoparticles provided an appropriate adsorption capacity (qm) of 45.24 mg.g-1 at pH 4 for phosphate ions. Besides, the adsorbent can be used with an efficiency of 92.49% up to three times that reduced to 52.89% after ten times. In addition, the adsorption process was justified by thermodynamics which confirmed the proposed adsorption mechanism. Hence, the models were provided surface adsorption, monolayer pattern, and the physical mechanism of the phosphate removal process using MPANI@La. Hence the proposed adsorbent can be used as an alternative adsorbent in environmental water remediation.
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