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<p>Wastewater decontamination via engineered sorption technologies demands high-performance and sustainable adsorbents. Herein, a low-cost and high-performance adsorbent is fabricated by using grass (<i>Cynodondactylon)</i> extract (GE) that acts as a cross-linker cum reducing agent for assembling e-waste-derived graphitic oxide (GrO) nanosheets into sponge-like monolithic graphene aerogel (GGA). The density of GGA is less than 9.4 ± 0.3 mgcm<sup>−3</sup> while the surface area is about 735 m<sup>2</sup>g<sup>−1</sup>. GGA presents excellent dye removal efficiency both for specimen samples and industrial effluents. With specimen samples, GGA exhibits a maximum adsorption capacity of 714.28 mgg<sup>−1</sup> for methylene blue (MB) as per the Langmuir adsorption isotherm model with an equilibrium time of 70–80&#xa0;min. Furthermore, GGA shows outstanding recyclability with retention of almost 70% adsorption capacity even after 40 cycles. In fixed bed column configuration, GGA exhibits more than 85% MB removal efficiency in 6&#xa0;min for a 50 mL effluent sample (collected from the local dyeing market). Promisingly, after the regeneration of GGA by methanol, the collected dye, methanol, and active adsorbent are recoverable, reusable, and recyclable which is unprecedented for most of the adsorbents.</p>

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Grass-mediated synthesis of green and sustainable graphene aerogels for recovery of synthetic dyes from wastewater

  • 期刊论文

  • 发表日期：

    2025年1月7日

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  • Chankit,
  • Ashok K. Sharma

摘要

Wastewater decontamination via engineered sorption technologies demands high-performance and sustainable adsorbents. Herein, a low-cost and high-performance adsorbent is fabricated by using grass (Cynodondactylon) extract (GE) that acts as a cross-linker cum reducing agent for assembling e-waste-derived graphitic oxide (GrO) nanosheets into sponge-like monolithic graphene aerogel (GGA). The density of GGA is less than 9.4 ± 0.3 mgcm−3 while the surface area is about 735 m2g−1. GGA presents excellent dye removal efficiency both for specimen samples and industrial effluents. With specimen samples, GGA exhibits a maximum adsorption capacity of 714.28 mgg−1 for methylene blue (MB) as per the Langmuir adsorption isotherm model with an equilibrium time of 70–80 min. Furthermore, GGA shows outstanding recyclability with retention of almost 70% adsorption capacity even after 40 cycles. In fixed bed column configuration, GGA exhibits more than 85% MB removal efficiency in 6 min for a 50 mL effluent sample (collected from the local dyeing market). Promisingly, after the regeneration of GGA by methanol, the collected dye, methanol, and active adsorbent are recoverable, reusable, and recyclable which is unprecedented for most of the adsorbents.