Molten salt synthesis of rutile phase Ag/TiO2 nanowires for efficient photoreduction of Cr(VI)

Next Materials Pub Date : 2025-07-22 DOI:10.1016/j.nxmate.2025.100978

Sarah Keiza Ismail , Munawar Khalil , Jeong-Myeong Ha , Rika Tri Yunarti

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Abstract

The morphology of TiO₂ structures is a critical parameter in photocatalysis. Fabricating rutile phase TiO₂ in nanostructures forms is a promising method to increase the surface area of the catalyst, thereby accelerating photocatalytic rates. The Molten salt synthesis (MSS) method can be used to enhance the reaction rate of a crystalline solid over an extended period of time. Nonetheless, TiO₂ photocatalytic activity is limited to UV light exposure. Additionally, modification with Ag (silver) nanoparticle is a potential option for enhancing the photocatalytic activity. In this research, rutile phase TiO₂ with nanowires (NW) morphology was prepared by the molten-salt method with addition of Ag into the surface of TiO₂. The Ag/TiO₂ NW was investigated for its photocatalytic performance to reduce hexavalent chromium (Cr(VI)) under visible-light irradiation. According to the result, Ag/TiO₂ NW achieved Cr(VI) photoreduction efficiency of 96.38 % after 150 min of irradiation time with a rate constant (k_app) of 2.21 × 10⁻² min⁻¹. The photodegradation of Cr(VI) followed pseudo-first-order kinetics. The electron-hole photogeneration was hindered with the existence of Ag nanoparticles, which contributed the increased photocatalytic activity from the rutile phase Ag/TiO₂ NW. This research provided an affordable and eco-friendly approach to produce nanomaterial to enhance photocatalytic activity for reduction of heavy metal.

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熔盐法制备金红石相Ag/TiO2纳米线高效光还原Cr（VI）

TiO2结构的形貌是光催化的关键参数。以纳米结构形式制备金红石相TiO2是一种很有前途的方法，可以增加催化剂的表面积，从而加快光催化速率。熔盐合成（MSS）方法可用于在较长时间内提高结晶固体的反应速率。然而，TiO2的光催化活性仅限于紫外线照射。此外，银纳米粒子修饰是提高光催化活性的一种潜在选择。本研究采用熔盐法制备了具有纳米线形貌的金红石相TiO2，并在TiO2表面添加Ag。研究了Ag/TiO2 NW在可见光照射下对六价铬（Cr(VI)）的光催化性能。结果表明，Ag/TiO2 NW在辐照150 min后，Cr（VI）光还原效率为96.38 %，速率常数（kapp）为2.21 × 10−2 min−1。Cr（VI）的光降解遵循准一级动力学。Ag纳米粒子的存在阻碍了电子空穴的光生成，从而提高了金红石相Ag/TiO2 NW的光催化活性。本研究为提高光催化还原重金属活性的纳米材料的制备提供了一种经济、环保的方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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