Layered silicate stabilises diiron to mimic UV-shielding TiO2 nanoparticle
Layered silicate stabilises diiron to mimic UV-shielding TiO2 nanoparticle
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DOI：
10.1016/j.mtnano.2022.100227
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发表时间：
2022-08-01
影响因子：
10.3
通讯作者：
Ide, Yusuke
中科院分区：
文献类型：
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作者：
El-Hosainy, Hamza;Mine, Shinya;Ide, Yusuke
尽管水-Fe（III）络合物在生物酶中无处不在，并且它们具有有用的特性和成本效益，但人工稳定这些短暂的分子以用于实际用途仍然具有挑战性。在此，我们证明，二聚水-Fe（III）物种可以使用柔性微孔层状硅酸盐稳定，以产生具有显著降低的不期望的光催化活性的白色UV吸收粉末。这种粉末材料和天然油的混合物被成功地用于屏蔽UV敏感基底;其屏蔽性能与商业TiO（2）（）金红石涂层的屏蔽性能相当。综合分析和计算表明，二羟基桥联的二聚体[（H2O）（OH）（2）O 5 FeIII（OH）（2）（FeOS）-O-III（H2O）（OH）（2）]（O-S：骨架氧）与硅酸盐孔相匹配，并解释了材料的稳定性和屏蔽性能。虽然TiO 2纳米颗粒被广泛用作防晒霜和化妆品中的紫外线吸收剂，但由于其细胞毒性，它们会对健康造成风险。因此，这种材料可以作为一种安全，具有成本效益的TiO 2纳米粒子的替代品，无论是作为紫外线吸收剂还是在其他应用中。(C)2022爱思唯尔有限公司保留所有权利。
Despite the ubiquity of aqua-Fe(III) complexes in biological enzymes and their useful properties and cost-effectiveness, artificially stabilizing these fleeting molecules for practical uses remains challenging. Herein, we demonstrate that a dimeric aqua-Fe(III) species can be stabilised using a flexible microporous layered silicate to produce a white UV-absorbing powder with significantly reduced undesirable photocatalytic activity. A mixture of this powder material and a natural oil is successfully employed to shield a UV-sensitive substrate; its shielding performance was comparable to that of a commercial-TiO(2)( )rutile coating. Comprehensive analyses and calculations reveal that a dihydroxo-bridged dimer, [(H2O)(OH)(2)O5FeIII(OH)(2)(FeOS)-O-III(H2O) (OH)(2)] (O-S: framework oxygen), fits the silicate pore and account for the stabilities and shielding properties of the material. Although TiO2 nanoparticles are widely used as UV absorbers in sunscreens and cosmetics, they pose health risks owing to their cytotoxicity. Thus, this material can serve as a safe, cost-effective alternative to TiO2 nanoparticles, either as a UV absorber or in other applications. (C) 2022 Elsevier Ltd. All rights reserved.