Taib Mustaffa Ali Azhar, Alias Nurhaswani, Jaafar Mariatti, Razak Khairunisak Abdul, Tan Wai Kian, Shahbudin Irna Puteri, Kawamura Go, Matsuda Atsunori, Lockman Zainovia
Green Electronics Oxide nanoMaterials Group (GEM), School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, 14300, Nibong Tebal, Penang, Malaysia. Advanced Technology Training Centre (ADTEC) Taiping, PT 15643, Kamunting Raya, Mukim Asam Kumbang, 34600, Kamunting, Perak, Malaysia.
Nanotechnology. 2020 Oct 23;31(43):435605. doi: 10.1088/1361-6528/aba3d8. Epub 2020 Jul 8.
Arrays of TiO nanotubes (TiO NTs) with grassy surfaces were observed on titanium foil anodised at 60 V in fluorinated ethylene glycol (EG) with added hydrogen peroxide (HO). The grassy surface was generated by the chemical etching and dissolution of the surface of the TiO NTs walls, which was accelerated by the temperature increase on the addition of HO . Upon annealing at 600 °C, the grassy part of the TiO NTs was found to consist of mostly anatase TiO whereas the bottom part of the anodic oxide comprised a mixture of anatase and rutile TiO. The TiO NTs were then used to reduce hexavalent chromium (Cr(VI)) under ultraviolet radiation. They exhibited a rather efficient photocatalytic effect, with 100% removal of Cr(VI) after 30 min of irradiation. The fast removal of Cr(VI) was due to the anatase dominance at the grassy part of the TiO NTs as well as the higher surface area the structure may have. This work provides a novel insight into the photocatalytic reduction of Cr(VI) on grassy anatase TiO NTs.
在添加了过氧化氢（HO）的氟化乙二醇（EG）中于60V电压下对钛箔进行阳极氧化处理后，观察到了具有草状表面的二氧化钛纳米管（TiO NTs）阵列。草状表面是由TiO NTs管壁表面的化学蚀刻和溶解产生的，添加HO后温度升高加速了这一过程。在600℃退火后，发现TiO NTs的草状部分主要由锐钛矿型TiO组成，而阳极氧化物的底部部分则由锐钛矿型和金红石型TiO的混合物组成。然后，TiO NTs被用于在紫外辐射下还原六价铬（Cr(VI)）。它们表现出相当高效的光催化效果，照射30分钟后Cr(VI)的去除率达到100%。Cr(VI)的快速去除归因于TiO NTs草状部分的锐钛矿型占主导以及该结构可能具有的更高表面积。这项工作为草状锐钛矿型TiO NTs上Cr(VI)的光催化还原提供了新的见解。
