Redox-driven sustainable solutions: Metal-polydopamine composites for tetracycline remediation and antifungal applications

文献类型： 外文期刊

第一作者： Ul Ain, Qurat

作者： Ul Ain, Qurat;Liang, Pingfei;Liu, Kun;Tong, Zhangfa;Ul Ain, Qurat;Huang, Kai;Rasheed, Usman;Rasheed, Usman

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关键词： Polydopamine; Tetracycline; Adsorption; Bentonite; Antifungal

期刊名称：SEPARATION AND PURIFICATION TECHNOLOGY （ 影响因子：9.0； 五年影响因子：8.5 ）

ISSN： 1383-5866

年卷期： 2025 年 367 卷

页码：

收录情况： SCI

摘要： Synthesis of green products and their multipurpose use is crucial for the sustainability of material engineering science. For the first time, exploiting the redox chemistry between oxidizing transition metal ions (Ag+, Cu2+, Zn2+, Fe3+) and reducing dopamine, we developed highly functional metal-polydopamine (Mx-PDA) nano-particle composites for broad-spectrum applications. To prevent the autoxidation of dopamine, reaction conditions were maintained mildly acidic, allowing metal ions to act as oxidants. Ag-PDA and Cu-PDA composites demonstrated effective catalytic degradation of tetracycline (TC) and excellent fungicidal activity. When integrated with bentonite (BNT), Cu-PDA and Zn-PDA significantly improved TC adsorption capacity of bentonite, presenting an innovative and scalable solution for addressing pharmaceutical contamination. SEM and TEM analyses revealed distinct morphologies for each composite, with high metal loading and uniform particle size distributions. Cu-PDA exhibited a non-radical degradation mechanism for TC, driven by the generation of O-1(2) and h(+), with a rate constant as high as 0.05 min(-1). Adsorption studies showed that Cu-PDA-BNT and Zn-PDABNT achieved maximum Langmuir adsorption capacities of 223 mg/g and 163 mg/g, respectively, with equivalent TC adsorption efficiency in tap water and lake water. Cu-PDA retained over 90 % of its TC degradation capacity after five consecutive reusability cycles. Cu-PDA-BNT and Zn-PDA-BNT could adsorb 79 % and 81 %, respectively, of TC after ten reusability cycles. Furthermore, Ag-PDA proved a powerful fungicidal effect against Fusarium Oxysporum, a 5.85 mu g/g MIC, outperforming commercial fungicides. The fungicidal mechanism involved membrane damage and apoptosis-like cell death. These results demonstrate the potential of metal-PDA composites for diverse applications in environmental and biomedical fields.

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