Engineering Durable Superhydrophobic Photocatalyst for Oil‐Water Separation and Degradation of Chemical Pollutants
Engineering Durable Superhydrophobic Photocatalyst for Oil‐Water Separation and Degradation of Chemical Pollutants
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工程耐用超疏水光催化剂用于油水分离和化学污染物降解
DOI：
10.1002/slct.202100925
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发表时间：
2021-08
期刊：
影响因子：
2.1
通讯作者：
Xun Yuan
中科院分区：
文献类型：
--
作者：
Haiguang Zhu;Long Chen;Xinyue Dou;Yong Liu;Xun Yuan
摘要 废水处理，特别是含有不溶性油类和可溶性化学污染物的废水处理，一直是环境保护领域的主要关注点。结合疏水性和光催化活性的材料是从水中分离不溶性油和光降解可溶性化学污染物的良好候选者。然而，此类材料的广泛应用因其易受光分解问题而受到限制。在本文中，我们报告了一种耐用而高效的疏水光催化剂的设计，通过将光催化二氧化钛（TiO2）固定在碳化三聚氰胺泡沫（CMF）上以获得三维（3D）多孔结构，然后在TiO2表面上涂覆疏水性聚二甲基硅氧烷（PDMS）层（CMF-TiO2-PDMS）。该设计的主要特点是，PDMS 层可以在紫外线照射下与 TiO2 形成化学键，从而重新接枝到 TiO2 表面，从而赋予所得的 CMF-TiO2-PDMS 稳定的疏水性，从而持久抵抗光催化氧化。正如预期的那样，所设计的 CMF-TiO2-PDMS 光催化剂在去除不溶性有机溶剂和在紫外线照射下光降解可溶性化学污染物方面表现出优异的耐久性。这项研究很有趣，不仅因为它为设计用于废水处理的耐用而高效的疏水光催化剂提供了范例，而且还为其他多功能材料的设计提供了启示。
Abstract Wastewater treatment, especially for those containing insoluble oils and soluble chemical pollutants, has been a major concern in the field of environmental protection. Materials integrating both hydrophobicity and photocatalytic activity are good candidates in terms of separating insoluble oils from water and photodegrading soluble chemical pollutants. However, the wide application of such materials is curtailed by their susceptible photodecomposition issue. In this paper, we report the design of a durable yet efficient hydrophobic photocatalyst by immobilizing photocatalytic titanium dioxide (TiO2) on a carbonized melamine foam (CMF) for a three-dimensional (3D) porous structure, and subsequently coating a hydrophobic polydimethylsiloxane (PDMS) layer on TiO2 surface (CMF-TiO2-PDMS). The key feature of the design is that the PDMS layer could re-graft on the TiO2 surface via forming chemical bonds with TiO2 under UV illumination, granting the resulting CMF-TiO2-PDMS stable hydrophobicity to durably resist photocatalytic oxidation. As expected, the as-designed CMF-TiO2-PDMS photocatalyst shows excellent durability in removing insoluble organic solvents and photodegrading soluble chemical pollutants under UV illumination. This study is interesting not only because it provides a paradigm in designing durable yet efficient hydrophobic photocatalyst for wastewater treatment, but also shed lights on the design of other multifunctional materials.
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