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<p>In this study, a grafted benzaldehyde-chitosan/algae/zeolite (CHI_BZD/AL/ZEO) biocomposite matrix was synthesized by hydrothermal heating process followed by freeze-drying process for CHI_BZD/AL/ZEO biocomposite. The adsorptive characteristic CHI_BZD/AL/ZEO towards removal of toxic cationic dye namely brilliant green (BG) was evaluated and optimized by using Box-Behnken Design (BBD) and desirability function approach. BBD test was performed to optimize the independent working variables including A: CHI_BZD/AL/ZEO dosage (0.02–0.1&#xa0;g/ 0.1&#xa0;L), B: pH (4–10), and C: adsorption time (20–80&#xa0;min). Moreover, the best BG removal 96.2% can be achieved at CHI_BZD/AL/ZEO dosage = 0.088&#xa0;g/100 mL, BG solution pH = 7.6, and adsorption time = 193.8&#xa0;min. The adsorption isotherm was well presented by Langmuir and the Freundlich models, and the adsorption kinetic was well describe by pseudo-second order (PSO). Thus, CHI_BZD/AL/ZEO shows a maximum adsorption capacity (<i>q</i><sub>max</sub>) of 301.9&#xa0;mg/g at 25&#xa0;°C. The BG dye loading onto CHI_BZD/AL/ZEO surface can be assigned to electrostatic forces, H-bonding, Yoshida-H bonding, and n-π stacking. Generally, CHI_BZD/AL/ZEO biocomposite matrix presents itself as promising reusable adsorbent for eliminating toxic cationic dye (BG) from aqueous environment.</p>

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Modeling and experimental design optimization of toxic brilliant green dye removal using schiff’s base benzaldehyde grafted- modified chitosan: desirability function, reusability, and adsorption mechanism

  • 期刊论文

  • 发表日期：

    2025年12月13日

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  • Aiman Suhaimi,
  • Ali H. Jawad,
  • Hussein A. Kazem

摘要

In this study, a grafted benzaldehyde-chitosan/algae/zeolite (CHI_BZD/AL/ZEO) biocomposite matrix was synthesized by hydrothermal heating process followed by freeze-drying process for CHI_BZD/AL/ZEO biocomposite. The adsorptive characteristic CHI_BZD/AL/ZEO towards removal of toxic cationic dye namely brilliant green (BG) was evaluated and optimized by using Box-Behnken Design (BBD) and desirability function approach. BBD test was performed to optimize the independent working variables including A: CHI_BZD/AL/ZEO dosage (0.02–0.1 g/ 0.1 L), B: pH (4–10), and C: adsorption time (20–80 min). Moreover, the best BG removal 96.2% can be achieved at CHI_BZD/AL/ZEO dosage = 0.088 g/100 mL, BG solution pH = 7.6, and adsorption time = 193.8 min. The adsorption isotherm was well presented by Langmuir and the Freundlich models, and the adsorption kinetic was well describe by pseudo-second order (PSO). Thus, CHI_BZD/AL/ZEO shows a maximum adsorption capacity (qmax) of 301.9 mg/g at 25 °C. The BG dye loading onto CHI_BZD/AL/ZEO surface can be assigned to electrostatic forces, H-bonding, Yoshida-H bonding, and n-π stacking. Generally, CHI_BZD/AL/ZEO biocomposite matrix presents itself as promising reusable adsorbent for eliminating toxic cationic dye (BG) from aqueous environment.