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Abstract <p>While MIL-101(Cr) possesses an elevated specific surface area and a well-ordered framework, its performance in removing cationic tetracycline (TC) and minocycline (MC) is limited by its weak surface electronegativity and insufficient active adsorption sites. To address this, strongly electronegative phosphotungstic acid (PTA) was introduced within the MIL-101(Cr) framework, thereby augmenting its surface electronegativity. Subsequently, a bimetallic (Mg and Zr) doping strategy was employed to fabricate a novel MgZr@PTA-MIL-101(Cr) composite, which synergistically boosted the adsorption of TC and MC. Despite a slight reduction in specific surface area compared to MIL-101(Cr), the synthesized composite maintained a high value of 1555.95 m<sup>2</sup>·g<sup>−1</sup> and exhibited favorable thermal stability. The adsorption of TC and MC by MgZr@PTA-MIL-101(Cr) obeyed the pseudo-second-order and Langmuir models. The maximum adsorption capacities reached 406.45&#xa0;mg·g<sup>−1</sup> (TC) and 414.91&#xa0;mg·g<sup>−1</sup> (MC), demonstrating exceptional performance. MgZr@PTA-MIL-101(Cr) consistently achieved adsorption efficiencies of approximately 90% across different water matrices and retained over 75% adsorption efficiency after five consecutive regeneration cycles, highlighting its robust environmental adaptability and reusability. Mechanistic studies revealed that complexation, π-π interactions, hydrogen bonding, and electrostatic interactions are the primary mechanisms driving the adsorption process. Overall, MgZr@PTA-MIL-101(Cr) shows significant promise for the practical remediation of wastewater containing antibiotics.</p>

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Synergistic Charge Modulation and Bimetallic Site Decoration to Construct MgZr@PTA-MIL-101(Cr) for Enhanced Tetracycline and Minocycline Adsorption

  • 期刊论文

  • 发表日期：

    2026年6月15日

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  • Zhiqiang Guo,
  • Xinlong Wang,
  • Zongzheng Liu,
  • Hongwei Guo,
  • Yuan Li

摘要

Abstract

While MIL-101(Cr) possesses an elevated specific surface area and a well-ordered framework, its performance in removing cationic tetracycline (TC) and minocycline (MC) is limited by its weak surface electronegativity and insufficient active adsorption sites. To address this, strongly electronegative phosphotungstic acid (PTA) was introduced within the MIL-101(Cr) framework, thereby augmenting its surface electronegativity. Subsequently, a bimetallic (Mg and Zr) doping strategy was employed to fabricate a novel MgZr@PTA-MIL-101(Cr) composite, which synergistically boosted the adsorption of TC and MC. Despite a slight reduction in specific surface area compared to MIL-101(Cr), the synthesized composite maintained a high value of 1555.95 m2·g−1 and exhibited favorable thermal stability. The adsorption of TC and MC by MgZr@PTA-MIL-101(Cr) obeyed the pseudo-second-order and Langmuir models. The maximum adsorption capacities reached 406.45 mg·g−1 (TC) and 414.91 mg·g−1 (MC), demonstrating exceptional performance. MgZr@PTA-MIL-101(Cr) consistently achieved adsorption efficiencies of approximately 90% across different water matrices and retained over 75% adsorption efficiency after five consecutive regeneration cycles, highlighting its robust environmental adaptability and reusability. Mechanistic studies revealed that complexation, π-π interactions, hydrogen bonding, and electrostatic interactions are the primary mechanisms driving the adsorption process. Overall, MgZr@PTA-MIL-101(Cr) shows significant promise for the practical remediation of wastewater containing antibiotics.