负载型新生态MnO<sub>2</sub>氧化BPA的效能与机制

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摘要通过黏附于矿物载体气泡石表面的植物多酚单宁酸(TA)还原高锰酸钾(KMnO₄),制得了原位负载于气泡石表面的网络状多孔新生态MnO₂,研究了其氧化去除水中内分泌干扰物双酚A(BPA)的性能和机制,考察了其在复杂水质条件下的抗干扰能力和稳定性.负载型网络状新生态MnO₂(S-MnO₂)易分离,同时具有网络状多孔结构,展现出优异的BPA降解性能,50mL体系中,当S-MnO₂的投加量为4.0g(含7.08 μmol MnO₂)时,BPA在60min内的去除率达94%,与同剂量粉体MnO₂相比提升了4.5倍.机理研究表明S-MnO₂表面的Mn(III)和Mn(IV)均参与了BPA的氧化去除,其中Mn(III)是BPA快速去除的关键.S-MnO₂主要通过单电子氧化的方式除去BPA,因此对阴阳离子、天然有机质等水体背景成分有着较强的抗干扰能力,在复杂水质条件下仍可高效去除BPA.S-MnO₂具有一定的循环稳定性,且可通过KMnO₄氧化恢复活性,在新污染有机物治理方面展现出良好的应用前景.

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	尹皓晨
	秦夕然
	张哲睿
	马明宇
	赵春科
	卢金锁
	王根

关键词 ：负载型新生态MnO₂, 网络状结构, Mn(III), 双酚A

Abstract：Mineral supported nascent MnO₂ (S-MnO₂) with porous structure was prepared via reducing KMnO₄ by plant poly-phenol (e.g., tannic acid) anchored on the surface of airstone. The oxidation performance and mechanism of endocrine disruptors (such as bisphenol A, BPA) over S-MnO₂ was investigated, and stability of S-MnO₂ in complicated water matrix was studied. Due to the porous net-work like structure, the recoverable S-MnO₂ exhibited good performance toward the oxidation of BPA. When the dosage of S-MnO₂ was 4.0g (containing 7.08μmol MnO₂), 94% of BPA was removed in 60min, which was 4.5 times higher than that over the same amount of powdery nascent MnO₂. Mechanism studies revealed that Mn(III) and Mn(IV) were both participated into the oxidation of BPA, and Mn(III) was essential to the rapid removal of BPA. The removal of BPA was mainly ascribed to the single electron transfer reaction, which enabled good resistance to complex surroundings like anions, cations and natural organic matters. S-MnO₂ was relative stable for BPA removal in consecutive runs and could be facile regenerated via the oxidation by KMnO₄, revealing a promising potential for further application.

Key words： supported nascent MnO₂ network-like structure Mn(III) bisphenol A

收稿日期: 2024-01-15

PACS:

X703.5

基金资助:陕西省自然科学基础研究计划项目(2024JC-YBMS-290)

作者简介: 尹皓晨(1999-),女,陕西西安人,硕士研究生,主要研究方向为环境友好材料去除水中污染物.发表论文2篇.yhc0303@126.com.

引用本文:

尹皓晨, 秦夕然, 张哲睿, 马明宇, 赵春科, 卢金锁, 王根. 负载型新生态MnO₂氧化BPA的效能与机制[J]. 中国环境科学, 2024, 44(8): 4610-4620. YIN Hao-chen, QIN Xi-ran, ZHANG Zhe-rui, MA Ming-yu, ZHAO Chun-ke, LU Jin-suo, WANG Gen. Oxidation performance and mechanism of bisphenol A over supported nascent MnO₂. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(8): 4610-4620.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I8/4610

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