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<p>The present work focuses on studying the adsorption process of methylene blue (MB) from aqueous solutions using activated <i>Juglans regia</i> shells. The methylene blue adsorption tests were analyzed in static mode (batch). Moreover, optimizing the parameters governing the MB adsorption process (m<sub>ads</sub>, particle size, [MB], and time of contact) was performed using a Box-Behnken plan to minimize the time and number of experiments. The results showed that MB adsorption is almost complete, with a removal rate reaching 94.21%. The ANOVA analysis of variance showed that the postulated model is statistically adequate to describe the experimental results (R<sup>2</sup> = 99.54%) and (R<sup>2</sup>adj = 97.34%), and the residuals confirmed this perfect correlation between the experimental and theoretical data. Optimization by composite desirability (D = 1000) resulted in a maximum removal yield (R = 94.21%) for the optimal conditions. The modeling study suggests that the process of methylene blue uptake follows the pseudo-second order model with a maximum adsorbent quantity of 52.73&#xa0;mg&#xa0;g<sup>−1</sup>.</p>

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Adsorption and removal of methylene blue from aqueous media using activated Juglans regia shells: Box‑Behnken optimization, kinetic, and equilibrium studies

  • 期刊论文

  • 发表日期：

    2025年8月26日

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  • Hadjer Mamine,
  • Rima Bouhali,
  • Salah Rahmouni,
  • Hacene Bendjeffal,
  • Tayeb Bouarroudj,
  • Hakima Boulemch

摘要

The present work focuses on studying the adsorption process of methylene blue (MB) from aqueous solutions using activated Juglans regia shells. The methylene blue adsorption tests were analyzed in static mode (batch). Moreover, optimizing the parameters governing the MB adsorption process (mads, particle size, [MB], and time of contact) was performed using a Box-Behnken plan to minimize the time and number of experiments. The results showed that MB adsorption is almost complete, with a removal rate reaching 94.21%. The ANOVA analysis of variance showed that the postulated model is statistically adequate to describe the experimental results (R2 = 99.54%) and (R2adj = 97.34%), and the residuals confirmed this perfect correlation between the experimental and theoretical data. Optimization by composite desirability (D = 1000) resulted in a maximum removal yield (R = 94.21%) for the optimal conditions. The modeling study suggests that the process of methylene blue uptake follows the pseudo-second order model with a maximum adsorbent quantity of 52.73 mg g−1.