《新型Janus电催化膜助力超快水质净化》

在我们的日常生活中，水质污染一直是一个备受关注的问题。如何高效、快速地净化被污染的水，是科学家们不断探索的课题。最近，一项新的研究成果为水质净化带来了新的希望。研究团队由Ni Yan、Jiaming Zhang、Tengfei Ren、Mengxi Yin、Xia Huang和Xiaoyuan Zhang组成，他们发现了一种名为Janus电催化膜的神奇材料。这种膜就像一个“超级净化小能手”，能够通过特殊的顺序策略实现可调节的氧化还原反应，从而达到超快的水净化效果。Janus电催化膜具有独特的结构，它的两侧有着不同的催化功能。在净化水的过程中，它可以按照特定的顺序依次发挥作用。就好比一个训练有素的团队，每个成员都在合适的时间做着自己擅长的事情。通过这种顺序策略，它可以精准地对水中的污染物进行氧化和还原反应，将污染物分解或者转化为无害的物质。这项研究成果意义重大。它为解决水污染问题提供了一种新的技术手段，有望在未来的污水处理厂、饮用水净化等领域得到广泛应用，让我们能够更快、更好地获得干净、安全的水资源。

期刊

Environmental Science & Technology

标题

Janus Electrocatalytic Membrane Enables Tunable Redox via Sequential Tactics toward Ultrafast Water Decontamination

作者

Ni Yan, Jiaming Zhang, Tengfei Ren, Mengxi Yin, Xia Huang, and Xiaoyuan Zhang

摘要

Emerging contaminants (ECs) in water are a prominent environmental concern worldwide. Despite advanced oxidation or reduction being appealing transformation approaches, existing technologies face challenges in adaptability to the removal of both electron-rich ECs and ECs with electron-withdrawing moieties. Here, a Janus electrocatalytic membrane was fabricated to induce hydroxyl radicals (•OH) and atomic hydrogen (H*) simultaneously and tune redox processes via sequential tactics to achieve adaptable and ultrafast removal of diverse ECs. The Janus electrocatalytic carbon-fiber membrane with single-atom (SA) Fe and Ni anchored on two different sides, respectively, exhibited an excellent performance in the degradation of various ECs and treatment of the secondary effluent of pharmaceutical wastewater. Model ECs like propranolol and chloramphenicol were 100% removed at a high water flux (680 L m–2 h–1) and low energy consumption (<0.015 kWh m–3 log–1). In the electrofiltration sequence of Side-Fe to -Ni, the •OH yield was enhanced due to the flow-enhanced mass transfer of Side-Fe-induced H2O2 to Side-Ni-induced H* and the subsequent reaction to form •OH, favoring electron-rich organic degradation. While in the opposite sequence, the process of H*-mediated reduction followed by •OH-mediated oxidation achieved thermodynamical superiority, favoring the degradation of ECs with electron-withdrawing groups. This study highlighted a new reversible membrane design enabling tunable redox for the removal of various ECs from wastewater.

原文链接

https://pubs.acs.org/doi/10.1021/acs.est.5c03417

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静远嘲风（MY Scimage） 成立于2007年，嘲风取自中国传统文化中龙生九子，子子不同的传说，嘲风为守护屋脊之瑞兽，喜登高望远；静远取自成语“宁静致远”，登高莫忘初心，远观而不可务远。

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