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<p>In this study, we introduce a fast and simple process for modifying corn husk waste using a cationizing agent to enhance the adsorption efficiency of the anionic dye, C.I. Acid Red 88 (AR88), from an aqueous solution. Cationized corn husk (CCH) was characterized using Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, and a point of zero charge (PZC), confirming the successful modification of the biosorbent. The results indicated that, at an operating condition of pH = 7, dye concentration = 210&#xa0;mg/L, and CCH content = 30&#xa0;mg, the CCH exhibited significant adsorption efficiency of 99.08% for the anionic dye AR88. The PZC measurement of the CCH in the pH range from 2 to 12 confirmed a positively charged surface, corresponding to the strong electrostatic attraction toward AR88. Subsequently, higher adsorption efficiency was achieved at lower pH values. The isotherm and kinetic studies confirmed that sorption followed the Redlich-Peterson isotherm and the pseudo-first-order kinetic models. The plausible adsorption mechanisms were identified as electrostatic interaction, hydrogen bonding, π–π interactions, and diffusion into micropores. This work presents a new approach to modifying biowastes in one step for the efficient removal of organic pollutants from wastewater.</p>

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Modified corn husk waste as an efficient biosorbent for removal of organic dyes from aqueous solution

  • 期刊论文

  • 发表日期：

    2025年5月21日

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  • Milad Atighi,
  • Hanieh Ahmadi,
  • Aminoddin Haji,
  • Mahdi Hasanzadeh

摘要

In this study, we introduce a fast and simple process for modifying corn husk waste using a cationizing agent to enhance the adsorption efficiency of the anionic dye, C.I. Acid Red 88 (AR88), from an aqueous solution. Cationized corn husk (CCH) was characterized using Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, and a point of zero charge (PZC), confirming the successful modification of the biosorbent. The results indicated that, at an operating condition of pH = 7, dye concentration = 210 mg/L, and CCH content = 30 mg, the CCH exhibited significant adsorption efficiency of 99.08% for the anionic dye AR88. The PZC measurement of the CCH in the pH range from 2 to 12 confirmed a positively charged surface, corresponding to the strong electrostatic attraction toward AR88. Subsequently, higher adsorption efficiency was achieved at lower pH values. The isotherm and kinetic studies confirmed that sorption followed the Redlich-Peterson isotherm and the pseudo-first-order kinetic models. The plausible adsorption mechanisms were identified as electrostatic interaction, hydrogen bonding, π–π interactions, and diffusion into micropores. This work presents a new approach to modifying biowastes in one step for the efficient removal of organic pollutants from wastewater.