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<p>The detection of trace antibiotics in aquatic environments poses a critical global challenge, threatening both ecological safety and public health. Forward osmosis (FO) membrane separation technology has emerged as a highly efficient approach for purification of trace antibiotics, characterized by high treatment efficiency and low energy consumption. However, challenges inherent to the recycling of draw solutions restrict the development of FO technology. Herein, we report the synthesis and application of a novel CO<sub>2</sub>-responsive SiO<sub>2</sub>@PDEA nanocomposite as a highly recyclable particulate draw solution. This system leverages CO<sub>2</sub>/heat-triggered reversible switching between hydrophilicity and hydrophobicity to enable facile recovery. The 6 wt% SiO<sub>2</sub>@PDEA solution leads to a significantly enhanced water flux (<i>J</i><sub>w</sub>) to 5.31 LMH (PRO mode), a threefold increase over bare SiO<sub>2</sub>. Crucially, the ratio of reverse solute flux (<i>J</i><sub>s</sub>) to <i>J</i><sub>w</sub> was minimized to 0.015&#xa0;g/L, providing a substantial cost advantage over inorganic salts. The efficiency of this approach enabled a threefold concentration of tetracycline. Furthermore, the solution demonstrated outstanding cyclic stability with a solute recovery rate consistently exceeding 99% via mild thermal stimulation. These findings demonstrate that SiO<sub>2</sub>@PDEA is an exceptionally efficient, sustainable, and cost-effective draw solution with substantial potential for the practical remediation of trace antibiotic-containing wastewater. </p>

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Development of CO2-Responsive Draw Solution for Trace Antibiotic Wastewater Treatment

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月27日

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  • Ling Lei,
  • Jiaxiang Wang,
  • Feng Tian,
  • Mingjie Yin,
  • Wentao Wang,
  • Mengna Li,
  • Liangliang Dong

摘要

The detection of trace antibiotics in aquatic environments poses a critical global challenge, threatening both ecological safety and public health. Forward osmosis (FO) membrane separation technology has emerged as a highly efficient approach for purification of trace antibiotics, characterized by high treatment efficiency and low energy consumption. However, challenges inherent to the recycling of draw solutions restrict the development of FO technology. Herein, we report the synthesis and application of a novel CO2-responsive SiO2@PDEA nanocomposite as a highly recyclable particulate draw solution. This system leverages CO2/heat-triggered reversible switching between hydrophilicity and hydrophobicity to enable facile recovery. The 6 wt% SiO2@PDEA solution leads to a significantly enhanced water flux (Jw) to 5.31 LMH (PRO mode), a threefold increase over bare SiO2. Crucially, the ratio of reverse solute flux (Js) to Jw was minimized to 0.015 g/L, providing a substantial cost advantage over inorganic salts. The efficiency of this approach enabled a threefold concentration of tetracycline. Furthermore, the solution demonstrated outstanding cyclic stability with a solute recovery rate consistently exceeding 99% via mild thermal stimulation. These findings demonstrate that SiO2@PDEA is an exceptionally efficient, sustainable, and cost-effective draw solution with substantial potential for the practical remediation of trace antibiotic-containing wastewater.