Scholarlink

<p>Dye-laden toxic wastewater generated from textile industries creates a huge problem of toxicity and disposal. Novel research involves biopolymer-based adsorption as the most commonly used remedial method. Herein, a novel psyllium-based polyurethane foam (Psy-PUF) adsorbent was synthesized through polyaddition reaction with 4,4´-Diphenylmethane Diisocyanate (MDI) in the presence of 1,4-diazabicyclo (2.2.2) octane (DABCO 33-LV, as the catalyst), triethanolamine (as the co-catalyst), silicone oil (as a surfactant), and orange peel powder (as a filler) to eliminate dye pollutants. Psy-PUF was characterized using several techniques. The TGA (Thermogravimetric analysis) showed the significant thermal stability of the synthesized Psy-PUF with the final decomposition temperature of 841&#xa0;°C showing a tremendous increase compared to 601.9&#xa0;°C for untreated psyllium. Psy-PUF was studied as an adsorbent in binary dye mixtures including cationic and anionic dyes, and the best-adsorbed dyes i.e., malachite green (MG) and crystal violet (CV) were studied. Psy-PUF demonstrated rapid adsorption with 56.38% (MG) and 61.02% (CV) adsorbed only within 20&#xa0;min, reaching 96.04% and 93.58% for MG and CV, respectively, within 60&#xa0;min. The adsorption of MG and CV followed pseudo-second-order kinetics with respective R<sup>2</sup> values of 0.98747 and 0.98685. Moreover, the adsorption behavior of Psy-PUF aligned with the Langmuir isotherm, indicating <i>q</i><sub><i>m</i></sub> of 229.35&#xa0;mg. g<sup>−1</sup> for MG and 223.71&#xa0;mg. g<sup>−1</sup> for CV. Psy-PUF exhibited remarkable regeneration for up to ten cycles with cumulative adsorption capacities (<i>q</i><sub><i>max</i></sub><i>)</i> of 801.4&#xa0;mg. g<sup>−1</sup> and 760.3&#xa0;mg. g<sup>−1</sup> for MG and CV. Thus Psy-PUF is an economically viable, eco-friendly, biodegradable, and recyclable adsorbent, for removing harmful cationic dyes.</p> Graphical abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Synthesis of Thermally Stable Psyllium Husk/4,4´-Diphenylmethane Diisocyanate-Based Polyurethanes for Effective and Selective Removal of Cationic Dyes

  • 期刊论文

  • 发表日期：

    2025年4月1日

查看全文
  • Kriti,
  • Kiran Kumar,
  • Sunita Ranote,
  • Ghanshyam S. Chauhan,
  • Sandeep Chauhan,
  • Sapna Sharma

摘要

Dye-laden toxic wastewater generated from textile industries creates a huge problem of toxicity and disposal. Novel research involves biopolymer-based adsorption as the most commonly used remedial method. Herein, a novel psyllium-based polyurethane foam (Psy-PUF) adsorbent was synthesized through polyaddition reaction with 4,4´-Diphenylmethane Diisocyanate (MDI) in the presence of 1,4-diazabicyclo (2.2.2) octane (DABCO 33-LV, as the catalyst), triethanolamine (as the co-catalyst), silicone oil (as a surfactant), and orange peel powder (as a filler) to eliminate dye pollutants. Psy-PUF was characterized using several techniques. The TGA (Thermogravimetric analysis) showed the significant thermal stability of the synthesized Psy-PUF with the final decomposition temperature of 841 °C showing a tremendous increase compared to 601.9 °C for untreated psyllium. Psy-PUF was studied as an adsorbent in binary dye mixtures including cationic and anionic dyes, and the best-adsorbed dyes i.e., malachite green (MG) and crystal violet (CV) were studied. Psy-PUF demonstrated rapid adsorption with 56.38% (MG) and 61.02% (CV) adsorbed only within 20 min, reaching 96.04% and 93.58% for MG and CV, respectively, within 60 min. The adsorption of MG and CV followed pseudo-second-order kinetics with respective R2 values of 0.98747 and 0.98685. Moreover, the adsorption behavior of Psy-PUF aligned with the Langmuir isotherm, indicating qm of 229.35 mg. g−1 for MG and 223.71 mg. g−1 for CV. Psy-PUF exhibited remarkable regeneration for up to ten cycles with cumulative adsorption capacities (qmax) of 801.4 mg. g−1 and 760.3 mg. g−1 for MG and CV. Thus Psy-PUF is an economically viable, eco-friendly, biodegradable, and recyclable adsorbent, for removing harmful cationic dyes.

Graphical abstract