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<p>The current research work is an initiative taken for the remediation of water contaminated with carbon nanomaterials (CNMs) by employing microemulsion (ME) and cloud point extraction (CPE) methodologies. CNMs viz., graphene oxide (GO) and multiwalled carbon nanotube (MWCNT) dispersed in water (2000&#xa0;mg/L) were extracted in the oil phase and surfactant phase based on optimized ME and CPE parameters which include oil, pH, incubation temperature, the content of non-ionic-surfactants (Triton X-100) and NaCl. The supernatant and extracted CNMs from the ME and CPE experiments were analyzed using UV–Vis spectroscopy, DLS, SEM, TEM, XRD, and Raman spectroscopy. The disappearance of characteristic peaks of GO and MWCNT in the UV–Vis, Raman, and DLS spectra of the treated water samples signifies the absence of nanoparticles in the remediated water. A highly efficient removal (~ 97%) of GO and MWCNT from contaminated water through CPE in one cycle was achieved compared to ME (~ 90%) in two recovery cycles. Thus, the CPE technique efficiently removes CNMs from polluted water for their benign disposal, mitigating potential ecological and health risks.</p> Graphical Abstract <p></p>

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Recovery of Carbon Nanomaterials from an Aqueous Environment Employing Oil-Based Microemulsion and Surfactant-based Cloud Point Extraction

  • 期刊论文

  • 发表日期：

    2025年1月29日

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  • Lavi Dhiman,
  • Dinesh Bhardwaj,
  • Vikas Kumar Gahlot,
  • Shalini Anand,
  • Santosh Kumar Singh,
  • Pramod Kumar Rai

摘要

The current research work is an initiative taken for the remediation of water contaminated with carbon nanomaterials (CNMs) by employing microemulsion (ME) and cloud point extraction (CPE) methodologies. CNMs viz., graphene oxide (GO) and multiwalled carbon nanotube (MWCNT) dispersed in water (2000 mg/L) were extracted in the oil phase and surfactant phase based on optimized ME and CPE parameters which include oil, pH, incubation temperature, the content of non-ionic-surfactants (Triton X-100) and NaCl. The supernatant and extracted CNMs from the ME and CPE experiments were analyzed using UV–Vis spectroscopy, DLS, SEM, TEM, XRD, and Raman spectroscopy. The disappearance of characteristic peaks of GO and MWCNT in the UV–Vis, Raman, and DLS spectra of the treated water samples signifies the absence of nanoparticles in the remediated water. A highly efficient removal (~ 97%) of GO and MWCNT from contaminated water through CPE in one cycle was achieved compared to ME (~ 90%) in two recovery cycles. Thus, the CPE technique efficiently removes CNMs from polluted water for their benign disposal, mitigating potential ecological and health risks.

Graphical Abstract