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<p>Chitosan/oxidized multiwalled carbon nanotube (CS/MWCNT-COOH) composite was synthesized without using the otherwise commonly used and toxic crosslinking agents like glutaraldehyde. The composite was employed as an adsorbent to remove the extensively used anthraquinone dye Alizarin Red S (ARS) from water. A detailed investigation was carried out on various factors, such as initial dye concentration, pH, contact time, and the dosage of the adsorbent. The study shows a monolayer adsorption capacity of 460.8&#xa0;mg/g for CS/MWCNT-COOH composite, which is much higher than the previously reported values. Thermodynamic parameters ΔG<sup>0</sup>, ΔS<sup>0</sup>, and ΔH<sup>0</sup> indicate that the adsorption of ARS is spontaneous and exothermic. The regeneration studies showed the potential of adsorbent to be reused over multiple cycles. The higher adsorption capacity, ease of synthesis and reusability make the adsorbent more cost-effective than the previously reported ones.</p>

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Rapid and Cost-Effective Synthesis of Oxidized Multiwalled Carbon Nanotube Reinforced Chitosan with High Uptake Capacity of Alizarin Red S from Water

  • 期刊论文

  • 发表日期：

    2025年9月26日

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  • P. Neethu Das,
  • K. Govind Raj

摘要

Chitosan/oxidized multiwalled carbon nanotube (CS/MWCNT-COOH) composite was synthesized without using the otherwise commonly used and toxic crosslinking agents like glutaraldehyde. The composite was employed as an adsorbent to remove the extensively used anthraquinone dye Alizarin Red S (ARS) from water. A detailed investigation was carried out on various factors, such as initial dye concentration, pH, contact time, and the dosage of the adsorbent. The study shows a monolayer adsorption capacity of 460.8 mg/g for CS/MWCNT-COOH composite, which is much higher than the previously reported values. Thermodynamic parameters ΔG0, ΔS0, and ΔH0 indicate that the adsorption of ARS is spontaneous and exothermic. The regeneration studies showed the potential of adsorbent to be reused over multiple cycles. The higher adsorption capacity, ease of synthesis and reusability make the adsorbent more cost-effective than the previously reported ones.