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<p>Freshwater scarcity has become among the most critical global challenges in recent years because of the rapid increase in the human population, economic growth, and industrial development. In response, solar evaporation using effectual converters for seawater desalination and wastewater purification has emerged as one of the most promising solutions. Accordingly, in this study, a simple filtration approach for fabricating low-cost, self-floating photothermal converters composed of carbon nanotubes (CNTs) and filter paper is presented. The prepared Janus CNT@cellulose membrane exhibited appropriate wettability and excellent photothermal conversion ability. Under an irradiation of 1 sun (1000 W/m<sup>2</sup>), the highest evaporation rates of the Janus CNT@cellulose membrane for water and 3.5 wt% NaCl <sub>(aq)</sub> were 1.68 and 1.56 kg m<sup>−2</sup> h<sup>−1</sup>, respectively. Our materials exhibited outstanding rejection of metal ions and dyes under solar evaporation. Its low cost, good solar evaporation performance, and easy preparation make the Janus CNT@cellulose membrane promising for use in the fields of freshwater production and wastewater purification.</p>

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Facile construction of a Janus carbon nanotube/cellulose membrane for solar evaporation and dye wastewater purification

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Chih-Feng Wang,
  • Fshatsion Berhane Gessesew,
  • Wei-Song Hung,
  • Chien-Chieh Hu,
  • Chi-Jung Chang,
  • Shiao-Wei Kuo,
  • Juin-Yih Lai

摘要

Freshwater scarcity has become among the most critical global challenges in recent years because of the rapid increase in the human population, economic growth, and industrial development. In response, solar evaporation using effectual converters for seawater desalination and wastewater purification has emerged as one of the most promising solutions. Accordingly, in this study, a simple filtration approach for fabricating low-cost, self-floating photothermal converters composed of carbon nanotubes (CNTs) and filter paper is presented. The prepared Janus CNT@cellulose membrane exhibited appropriate wettability and excellent photothermal conversion ability. Under an irradiation of 1 sun (1000 W/m2), the highest evaporation rates of the Janus CNT@cellulose membrane for water and 3.5 wt% NaCl (aq) were 1.68 and 1.56 kg m−2 h−1, respectively. Our materials exhibited outstanding rejection of metal ions and dyes under solar evaporation. Its low cost, good solar evaporation performance, and easy preparation make the Janus CNT@cellulose membrane promising for use in the fields of freshwater production and wastewater purification.