Kenchappa Somashekharappa Kiran, Lokesh Sampangi Venkatesh
Department of Nanotechnology, Centre for PG Studies-Bangalore Region, Visvesvaraya Technological University, Muddenahalli, Chikkaballapura 562101, India.
ACS Omega. 2021 Mar 12;6(11):7248-7256. doi: 10.1021/acsomega.0c02087. eCollection 2021 Mar 23.
The degradation of methylene blue and rhodamine B dyes using potassium hexatitanate nanoparticles (KTNPs) and potassium hexatitanate nanotubes (KTNTs) synthesized via a hydrothermal method as efficient photocatalysts under UV light irradiation was investigated. The kinetics of degradation was determined for the two different catalysts--KTNPs and KTNTs--by monitoring the optical absorption of the dyes. The as-synthesized KTNPs were found to be spherical in shape with an average particle size of ∼36 ± 1.7 nm, whereas the KTNTs evidenced a tubular hollow structure with ∼7 nm internal diameter and ∼12 nm external diameter, as perused by structural and morphological studies. The larger surface area of KTNTs showed a greater impact on the photodegradation of dyes manifesting their high potential as compared to KTNPs under UV irradiation, and the reusability studies showed more than 90% (KTNTs) and 80% (KTNPs) degradation of the dyes even after the fourth cycle elucidating their stability.
研究了通过水热法合成的六钛酸钾纳米颗粒（KTNPs）和六钛酸钾纳米管（KTNTs）作为高效光催化剂在紫外光照射下对亚甲基蓝和罗丹明B染料的降解情况。通过监测染料的光吸收来确定两种不同催化剂——KTNPs和KTNTs的降解动力学。结构和形态学研究表明，合成的KTNPs呈球形，平均粒径约为36±1.7nm，而KTNTs呈管状中空结构，内径约为7nm，外径约为12nm。KTNTs较大的表面积对染料的光降解有更大影响，表明其在紫外光照射下比KTNPs具有更高的潜力，并且可重复使用性研究表明，即使在第四个循环后，染料的降解率仍超过90%（KTNTs）和80%（KTNPs），说明它们具有稳定性。
