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<p>This study presents the synthesis of an adsorbent material for the removal of brilliant green (BG) dye from aquatic systems using a composite (hereinafter, CTO/PC-HA) composed of chitosan and chemically modified pineapple (<i>Ananas comosus</i>) crown biomass <i>via</i> nitric acid (HNO<sub>3</sub>). Response surface methodology (RSM) was applied to examine the impact of three variables on BG dye adsorption: A: CTO/PC-HA dosage (0.02–0.08&#xa0;g), B: pH (4–10), and C: duration (10–40&#xa0;min). The key parameters for BG dye removal were optimized using a desirability function approach, yielding optimal conditions (CTO/PC-HA dosage = 0.055&#xa0;g, solution pH = 9.7, and contact time = 39.3&#xa0;min). A maximum dye removal efficiency of 87.75% was achieved under these conditions. The BG dye adsorption onto CTO/PC-HA followed the pseudo-first-order kinetic model, indicating physical interactions. The Temkin isotherm best described the adsorption process, indicating uniform binding energies across the CTO/PC-HA surface. The CTO/PC-HA composite exhibited a maximum adsorption capacity of 316.96&#xa0;mg/g for BG dye. The hypothesized mechanism for the adsorption of the BG dye onto the CTO/PC-HA composite was based on electrostatic interaction, hydrogen bonding, and n-π stacking interaction. The results of this study demonstrate that CTO/PC-HA is a promising adsorbent for the treatment of wastewater contaminated with basic dyes. Furthermore, the findings highlight a green, sustainable, and environmentally friendly approach to synthesizing adsorbents derived from acid-modified lignocellulosic biomass and chitosan capable of efficiently removing cationic dyes from polluted water.</p>

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Acid-treated pineapple (Ananas comosus) crown biomass/chitosan composite for efficient brilliant green dye removal from water: adsorption modeling via response surface methodology

  • 期刊论文

  • 发表日期：

    2026年1月23日

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  • Ahmed Saud Abdulhameed,
  • Samaa Abdullah,
  • Rima Heider Al Omari,
  • Alaa A. Al-Masud,
  • Mahmoud Abualhaija,
  • Sameer Algburi

摘要

This study presents the synthesis of an adsorbent material for the removal of brilliant green (BG) dye from aquatic systems using a composite (hereinafter, CTO/PC-HA) composed of chitosan and chemically modified pineapple (Ananas comosus) crown biomass via nitric acid (HNO3). Response surface methodology (RSM) was applied to examine the impact of three variables on BG dye adsorption: A: CTO/PC-HA dosage (0.02–0.08 g), B: pH (4–10), and C: duration (10–40 min). The key parameters for BG dye removal were optimized using a desirability function approach, yielding optimal conditions (CTO/PC-HA dosage = 0.055 g, solution pH = 9.7, and contact time = 39.3 min). A maximum dye removal efficiency of 87.75% was achieved under these conditions. The BG dye adsorption onto CTO/PC-HA followed the pseudo-first-order kinetic model, indicating physical interactions. The Temkin isotherm best described the adsorption process, indicating uniform binding energies across the CTO/PC-HA surface. The CTO/PC-HA composite exhibited a maximum adsorption capacity of 316.96 mg/g for BG dye. The hypothesized mechanism for the adsorption of the BG dye onto the CTO/PC-HA composite was based on electrostatic interaction, hydrogen bonding, and n-π stacking interaction. The results of this study demonstrate that CTO/PC-HA is a promising adsorbent for the treatment of wastewater contaminated with basic dyes. Furthermore, the findings highlight a green, sustainable, and environmentally friendly approach to synthesizing adsorbents derived from acid-modified lignocellulosic biomass and chitosan capable of efficiently removing cationic dyes from polluted water.