Anodized TiO2 nanotubes using Ti wire in fluorinated ethylene glycol with air bubbles for removal of methylene blue dye
Anodized TiO2 nanotubes using Ti wire in fluorinated ethylene glycol with air bubbles for removal of methylene blue dye
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DOI：
10.1007/s10800-021-01644-z
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发表时间：
2021-11
影响因子：
2.9
通讯作者：
N. Isa;N. Mohamad Nor;W. Z. Wan Kamis;W. K. Tan;G. Kawamura;A. Matsuda;Z. Lockman
中科院分区：
文献类型：
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作者：
N. Isa;N. Mohamad Nor;W. Z. Wan Kamis;W. K. Tan;G. Kawamura;A. Matsuda;Z. Lockman
以乙二醇(EG)/氟化铵(NH_4F)-气泡电解液为电解液，用钛丝为阳极，制备了长度为7.25 ± 0.51-m、直径为66.78 ± 4.18 nm、壁厚为41.48 ± 4.31 nm的TiO2纳米管。探讨了TNTs在不同水分含量的电解液中生长的可能性。结果表明，在无水、有气泡的电解液中，TNTs的生长速度明显快于水含量为1-5%的电解液。研究了400℃热处理的优化TNTs在紫外光照射下，以硼氢化钠(NaBH4)为牺牲剂(空穴清除剂)对亚甲基蓝(MB)染料的光催化降解。结果表明，TNTs在第一次、第二次和第三次循环中，反应时间分别为70min，对MB的降解率分别为99%、74%和40%左右。动力学研究表明，光还原过程符合准一级动力学，第一、二、三个循环的反应速率分别为0.0280、0.0213和0.0052−1。这项研究的发现将为在EG/NH4F电解液中利用钛丝在EG/NH4F电解液中利用气泡在TNTs上诱导紫外光降解MB染料的设计提供新的见解。
TiO2nanotubes (TNTs) with self-aligned 7.25 ± 0.51-µm length, 66.78 ± 4.18-nm diameter, and 41.48 ± 4.31-nm wall thickness were fabricated using Ti wire in an anodic process using an ethylene glycol (EG)/NH4F–air bubbles electrolyte. The possible growth of TNTs in the electrolyte with different water content was explored. It was found that the growth rate of TNTs in an electrolyte with air bubbles and no water content was significantly faster than that in an electrolyte with 1–5-vol% water content. The degradation of methylene blue (MB) dye with sodium borohydride (NaBH4) as the sacrificial reagent (hole scavenger) under ultraviolet (UV) irradiation was investigated in a photocatalytic study of 400 °C annealed optimized TNTs. The results showed that TNTs can reduce MB at approximately 99%, 74%, and 40% removal efficiency using the first, second, and third cycles, respectively, for 70-min reaction time each. A kinetic study revealed that the photoreduction process followed the pseudo-first-order kinetic with reaction rates of 0.0280, 0.0213, and 0.0052 min−1for the first, second, and third cycles, respectively. This study’s findings will provide new insights into the design of UV light induced on anodized TNTs using Ti wire in EG/NH4F electrolytes with air bubbles aided by NaBH4for the degradation of MB dye.Graphical abstract