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<p>The development of highly efficient, environmentally-friendly, and multifunctional bio-based adsorbents for the recovery of precious metals is of great importance. Herein, a novel TiO₂-coated luffa fiber functionalized using trithiocyanuric acid (TiO₂/ALF-TTCA) was developed for the efficient recovery of Ag(I) and Au(III) from wastewater through combined adsorption and photocatalytic reduction under ultraviolet (UV) and sunlight irradiation. The pure adsorption process in the dark followed the pseudo-second-order kinetic model and fitted the Langmuir isotherm model well, with maximum adsorption capacities of 193.13&#xa0;mg·g⁻¹ for Ag(I) and 828.65&#xa0;mg·g⁻¹ for Au(III). This material achieved recovery efficiencies for Ag(I) and Au(III) of &gt; 99% upon UV irradiation. A wide range of characterization techniques confirmed the successful adsorption and reduction of Ag(I) and Au(III) upon UV irradiation, resulting in the formation of Ag and Au nanoparticles on the material’s surface. The material exhibited exceptionally high selectivity toward Au(III) with a selectivity coefficient 369–4942 times higher than those of other coexisting metal ions. Notably, after five cycles, the recovery efficiency for Ag(I) remained &gt; 95%, while the recovery efficiency of Au(III) was sustained above 88%, demonstrating the excellent stability. Moreover, the TiO₂/ALF-TTCA loaded with Ag and Au nanoparticles exhibited outstanding antimicrobial activity, achieving inhibition percentages of 98.60% and 100% against <i>Staphylococcus aureus</i> and 99.86% and 100% against <i>Escherichia coli</i>, respectively. This study highlights TiO₂/ALF-TTCA as a cost-effective and reusable adsorbent with promising applications in the recovery of precious metals from wastewater and as an antimicrobial material.</p>

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Recovery of Ag(I)/Au(III) using TiO2 and trithiocyanuric acid co-modified luffa fiber

  • 期刊论文

  • 发表日期：

    2026年3月28日

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  • Jiace Li,
  • Tiantian Yu,
  • Bingtian Zhao,
  • Yongmin Zhang

摘要

The development of highly efficient, environmentally-friendly, and multifunctional bio-based adsorbents for the recovery of precious metals is of great importance. Herein, a novel TiO₂-coated luffa fiber functionalized using trithiocyanuric acid (TiO₂/ALF-TTCA) was developed for the efficient recovery of Ag(I) and Au(III) from wastewater through combined adsorption and photocatalytic reduction under ultraviolet (UV) and sunlight irradiation. The pure adsorption process in the dark followed the pseudo-second-order kinetic model and fitted the Langmuir isotherm model well, with maximum adsorption capacities of 193.13 mg·g⁻¹ for Ag(I) and 828.65 mg·g⁻¹ for Au(III). This material achieved recovery efficiencies for Ag(I) and Au(III) of > 99% upon UV irradiation. A wide range of characterization techniques confirmed the successful adsorption and reduction of Ag(I) and Au(III) upon UV irradiation, resulting in the formation of Ag and Au nanoparticles on the material’s surface. The material exhibited exceptionally high selectivity toward Au(III) with a selectivity coefficient 369–4942 times higher than those of other coexisting metal ions. Notably, after five cycles, the recovery efficiency for Ag(I) remained > 95%, while the recovery efficiency of Au(III) was sustained above 88%, demonstrating the excellent stability. Moreover, the TiO₂/ALF-TTCA loaded with Ag and Au nanoparticles exhibited outstanding antimicrobial activity, achieving inhibition percentages of 98.60% and 100% against Staphylococcus aureus and 99.86% and 100% against Escherichia coli, respectively. This study highlights TiO₂/ALF-TTCA as a cost-effective and reusable adsorbent with promising applications in the recovery of precious metals from wastewater and as an antimicrobial material.