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<p>This study evaluated the adsorptive performance of a novel composite, mesoporous manganese silicate supported by activated carbon (MSSPAC), for extracting cadmium (Cd<sup>2</sup>⁺) and lead (Pb<sup>2</sup>⁺) from water. The composite was prepared using a straightforward, cost-effective, and environmentally benign synthesis technique, which enhanced the distribution of particles, structural robustness, and surface reactivity of the material. A suite of analytical techniques, including FTIR, SEM–EDX, XRD, point of zero charge measurement, TGA-DTA, and BET analysis, was employed to thoroughly characterize the synthesized adsorbent. The influence of critical operational parameters—such as solution pH, adsorbent mass, contact duration, initial metal concentration, and temperature—on the removal process was rigorously examined. The kinetic data aligned well with a pseudo-second-order model, and the adsorption equilibrium was most accurately represented by the Langmuir isotherm, pointing to a chemisorptive uptake mechanism. The thermodynamic analysis indicated that the adsorption process is exothermic and enthalpy-driven, with feasibility decreasing at higher temperatures due to entropic constraints. Under optimized conditions (pH 5.5, 0.01&#xa0;g of adsorbent, 60&#xa0;min of contact time, 150&#xa0;mg/L initial metal concentration, and room temperature), the composite exhibited substantial uptake capacities, reaching 132&#xa0;mg/g for Cd<sup>2</sup>⁺ and 114&#xa0;mg/g for Pb<sup>2</sup>⁺. Furthermore, regeneration studies demonstrated that a 1&#xa0;M HNO₃ solution could efficiently strip the adsorbed metal ions, maintaining over 90% desorption efficiency and allowing for the composite's reuse over several cycles. These findings underscore the potential of MSSPAC as a practical and recyclable material for treating heavy metal-contaminated water.</p>

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Simultaneous Capture of Harmful Lead and Cadmium Cations from Polluted Aquatic Sample using Mesoporous Manganese Silicate Supported by Activated Carbon from Palm Leaves

  • 期刊论文

  • 发表日期：

    2026年6月24日

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  • Amal E. Mubark,
  • Ahmed A. Eliwa,
  • Walaa F. Zaher,
  • Mohamed S. Hagag

摘要

This study evaluated the adsorptive performance of a novel composite, mesoporous manganese silicate supported by activated carbon (MSSPAC), for extracting cadmium (Cd2⁺) and lead (Pb2⁺) from water. The composite was prepared using a straightforward, cost-effective, and environmentally benign synthesis technique, which enhanced the distribution of particles, structural robustness, and surface reactivity of the material. A suite of analytical techniques, including FTIR, SEM–EDX, XRD, point of zero charge measurement, TGA-DTA, and BET analysis, was employed to thoroughly characterize the synthesized adsorbent. The influence of critical operational parameters—such as solution pH, adsorbent mass, contact duration, initial metal concentration, and temperature—on the removal process was rigorously examined. The kinetic data aligned well with a pseudo-second-order model, and the adsorption equilibrium was most accurately represented by the Langmuir isotherm, pointing to a chemisorptive uptake mechanism. The thermodynamic analysis indicated that the adsorption process is exothermic and enthalpy-driven, with feasibility decreasing at higher temperatures due to entropic constraints. Under optimized conditions (pH 5.5, 0.01 g of adsorbent, 60 min of contact time, 150 mg/L initial metal concentration, and room temperature), the composite exhibited substantial uptake capacities, reaching 132 mg/g for Cd2⁺ and 114 mg/g for Pb2⁺. Furthermore, regeneration studies demonstrated that a 1 M HNO₃ solution could efficiently strip the adsorbed metal ions, maintaining over 90% desorption efficiency and allowing for the composite's reuse over several cycles. These findings underscore the potential of MSSPAC as a practical and recyclable material for treating heavy metal-contaminated water.