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<p>This research aimed to showcase modified polylactic acid foam (PLAF) as an innovative biosorbent for extracting Mercury (Hg<sup>2+</sup>) and Lead (Pb<sup>2+</sup>) from water. For the first time, this was achieved by examining the strong interaction between diethyldithiocarbamate (DDTC) modified PLAF and the hydrophobic Hg/Pb complex. Using response surface methodology (RSM), four independent variables were optimized for metal extraction. The optimal conditions for Hg adsorption were identified as a pH of 7.1, temperature of 41.4&#xa0;°C, contact time of 51.5&#xa0;min, and DDTC concentration of 5.6%, achieving an optimal adsorption of 125.69&#xa0;mg&#xa0;g<sup>−1</sup>. For lead, the optimal conditions were pH of 6.4, temperature of 39.8&#xa0;°C, contact time of 68.5&#xa0;min, and 5.9% DDTC, resulting in a maximum adsorption capacity of 38.37&#xa0;mg&#xa0;g<sup>−1</sup>. The equilibrium adsorption data followed the Langmuir isotherm model. This model indicated q<sub>max</sub> values of approximately 121.95&#xa0;mg&#xa0;g<sup>−1</sup> for Hg and 39.37&#xa0;mg&#xa0;g<sup>−1</sup> for Pb. Additionally, the pseudo-second-order kinetic model best matched the experimental results. Thermodynamic parameters (ΔGº, ΔHº, ΔSº) were assessed to understand the adsorption process. This study lays the groundwork for further exploration of PLAF’s applications in environmental remediation.</p> Graphical Abstract <p></p>

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Functionalized polylactic acid foam for high-efficiency removal of Hg2⁺ and Pb2⁺ from aqueous media

  • 期刊论文

  • 发表日期：

    2026年4月2日

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  • M. Ghorbandoust,
  • M. Fasihi,
  • R. Norouzbeigi

摘要

This research aimed to showcase modified polylactic acid foam (PLAF) as an innovative biosorbent for extracting Mercury (Hg2+) and Lead (Pb2+) from water. For the first time, this was achieved by examining the strong interaction between diethyldithiocarbamate (DDTC) modified PLAF and the hydrophobic Hg/Pb complex. Using response surface methodology (RSM), four independent variables were optimized for metal extraction. The optimal conditions for Hg adsorption were identified as a pH of 7.1, temperature of 41.4 °C, contact time of 51.5 min, and DDTC concentration of 5.6%, achieving an optimal adsorption of 125.69 mg g−1. For lead, the optimal conditions were pH of 6.4, temperature of 39.8 °C, contact time of 68.5 min, and 5.9% DDTC, resulting in a maximum adsorption capacity of 38.37 mg g−1. The equilibrium adsorption data followed the Langmuir isotherm model. This model indicated qmax values of approximately 121.95 mg g−1 for Hg and 39.37 mg g−1 for Pb. Additionally, the pseudo-second-order kinetic model best matched the experimental results. Thermodynamic parameters (ΔGº, ΔHº, ΔSº) were assessed to understand the adsorption process. This study lays the groundwork for further exploration of PLAF’s applications in environmental remediation.

Graphical Abstract