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过氧钛酸盐纳米管用于罗丹明B光催化降解中阳离子交换的影响

Effects of Cation Exchange in Rhodamine B Photocatalytic Degradation Using Peroxo-Titanate Nanotubes.

作者信息

Han Do Hyung, Park Hyunsu, Goto Tomoyo, Cho Sunghun, Seo Yeongjun, Kondo Yoshifumi, Nishida Hisataka, Sekino Tohru

机构信息

Department of Advanced Hard Materials, SANKEN, Osaka University, 8-1 Mihogaoka, Ibaraki 567-0047, Japan.

Institute for Advanced Co-Creation Studies, Osaka University, 1-1 Yamadaoka, Suita 565-0871, Japan.

出版信息

Nanomaterials (Basel). 2024 Jul 9;14(14):1170. doi: 10.3390/nano14141170.

DOI:10.3390/nano14141170
PMID:39057847
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11279905/
Abstract

Lepidocrocite-type layered sodium titanate (NaHTiO) is widely used in environmental remediation because of its large specific surface area, formed by anisotropic crystal growth, and its ability to store and exchange cations between layers. Additionally, peroxo-titanate nanotubes (PTNTs), which are tubular titanates with peroxy groups, exhibit visible-light absorption capabilities, rendering them suitable for photocatalytic applications under visible light irradiation. However, because of cation exchange reactions, the Na concentration and pH of the solution can fluctuate under aqueous conditions, affecting the photocatalytic performance of the PTNTs. Herein, we evaluated the impact of cation exchange reactions on the photocatalytic degradation of Rhodamine B (Rh B) by PTNTs at controlled Na ratios. The observed pH of Rh B solutions increases due to the cation exchange reaction with Na and HO, leading to the formation of zwitter-ionic Rh B molecules, eventually weakening their adsorption and photodegradation performance. Moreover, the results indicate that inhibiting the pH increase of the Rh B solution can prevent the weakening of both the adsorption and photodegradation performance of PTNTs. This study highlights the significance of regulating the sodium ion content in layered titanate materials, emphasizing their importance in optimizing these materials' photocatalytic efficacy for environmental purification applications.

摘要

纤铁矿型层状钛酸钠（NaHTiO）因其具有较大的比表面积（由各向异性晶体生长形成）以及在层间储存和交换阳离子的能力，而被广泛应用于环境修复领域。此外，过氧钛酸盐纳米管（PTNTs）是带有过氧基团的管状钛酸盐，具有可见光吸收能力，使其适用于可见光照射下的光催化应用。然而，由于阳离子交换反应，在水相条件下溶液的Na浓度和pH值会发生波动，从而影响PTNTs的光催化性能。在此，我们评估了在控制Na比例的情况下阳离子交换反应对PTNTs光催化降解罗丹明B（Rh B）的影响。由于与Na和HO的阳离子交换反应，观察到Rh B溶液的pH值升高，导致两性离子Rh B分子的形成，最终削弱了它们的吸附和光降解性能。此外，结果表明抑制Rh B溶液的pH值升高可以防止PTNTs的吸附和光降解性能减弱。本研究突出了调节层状钛酸盐材料中钠离子含量的重要性，强调了其在优化这些材料用于环境净化应用的光催化效率方面的重要性。

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