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June 3, 2026Materials Science and Technology0 citations

Transforming industrial residues and ZnO nanoparticles into hybrid adsorbents for enhanced heavy metal removal

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PTPT ThoHVHuu-Tap VanTNT N P Nguyen

Key Points

  • This study aims to improve heavy metal adsorption from water by modifying power plant residues with zinc oxide nanoparticles.
  • Batch experiments were conducted to test various impregnation ratios of ZnO-NPs with power plant residues.
  • Optimal adsorption conditions were determined at different pH levels for each heavy metal tested.
  • Adsorption kinetics were analyzed using the pseudo-second-order model and the Redlich-Peterson model.
  • Maximum adsorption capacities were 43.59 mg/g for Pb(II), 39.64 mg/g for Cd(II), 40.93 mg/g for As(III), and 19.27 mg/g for Cr(VI).
  • Optimal pH levels for maximum adsorption were 7 for As(III), 8 for Cd(II), and 3 for both Pb(II) and Cr(VI).
  • The Redlich-Peterson model suggested adsorption was mainly driven by cation exchange and surface precipitation.

Abstract

This study explores the modification of power plant residues (PPR) with ZnO nanoparticles (ZnO-NPs) to improve adsorption of As(III), Cd(II), Pb(II), and Cr(VI). Batch experiments identified a 3% w/w impregnation ratio as optimal, creating PPR@ZnO3%. Maximum adsorption occurred at pH 7 for As(III), pH 8 for Cd(II), pH 3 for Pb(II), and pH 3 for Cr(VI), with capacities in the order of Pb(II) > Cd(II) > As(III) > Cr(VI). The pseudo-second-order model best fit the adsorption kinetics, with equilibrium capacities of 40.93 mg/g for As(III), 39.64 mg/g for Cd(II), 43.59 mg/g for Pb(II), and 19.27 mg/g for Cr(VI). The Redlich-Peterson model indicated homogeneous monolayer adsorption driven by cation exchange and surface precipitation.

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Cite This Study

Tho et al. (2026) studied this question.

synapsesocial.com/papers/6a1fc730dee9eb8c0dce80b1https://doi.org/10.1177/02670836261449723
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