锰钛矿型钙钛矿纳米盘对有机污染物的光催化去除活性。
Photocatalytic activity of MnTiO perovskite nanodiscs for the removal of organic pollutants.
作者信息
Kitchamsetti Narasimharao, Didwal Pravin N, Mulani Sameena R, Patil Madhuri S, Devan Rupesh S
机构信息
Department of Metallurgy Engineering and Materials Science, Indian Institute of Technology Indore, Simrol, Indore 453552, India.
Department of Materials Science and Engineering, Chonnam National University, 77, Yongbongro, Bukgu, Gwangju, 61186, South Korea.
出版信息
Heliyon. 2021 Jun 11;7(6):e07297. doi: 10.1016/j.heliyon.2021.e07297. eCollection 2021 Jun.
MTO nanodiscs synthesized using the hydrothermal approach were explored for the photocatalytic removal of methylene blue (MB), rhodamine B (RhB), congo red (CR), and methyl orange (MO). The disc-like structures of ~16 nm thick and ~291 nm average diameter of stoichiometric MTO were rhombohedral in nature. The MTO nanodiscs delivered stable and recyclable photocatalytic activity under Xe lamp irradiation. The kinetic studies showed the 89.7, 80.4, 79.4, and 79.4 % degradation of MB, RhB, MO, and CR at the rate constants of 0.011(±0.001), 0.006(±0.001), 0.007(±0.0007), and 0.009 (±0.0001) min, respectively, after the 180 min of irradiation. The substantial function of photogenerated holes and hydroxide radicals pertaining to the dye removal phenomena is confirmed by radical scavenger trapping studies. Overall, the present studies provide a way to develop pristine and heterostructure perovskite for photocatalysts degradation of various organic wastes.
研究了采用水热法合成的MTO纳米盘对亚甲基蓝（MB）、罗丹明B（RhB）、刚果红（CR）和甲基橙（MO）的光催化去除性能。化学计量比的MTO纳米盘呈盘状结构，厚度约为16 nm，平均直径约为291 nm，本质上为菱面体。在氙灯照射下，MTO纳米盘具有稳定且可循环的光催化活性。动力学研究表明，照射180分钟后，MB、RhB、MO和CR的降解率分别为89.7%、80.4%、79.4%和79.4%，速率常数分别为0.011（±0.001）、0.006（±0.001）、0.007（±0.0007）和0.009（±0.0001）min⁻¹。自由基捕获研究证实了光生空穴和氢氧根自由基在染料去除现象中的重要作用。总体而言，本研究为开发用于光催化降解各种有机废物的原始和异质结构钙钛矿提供了一种方法。
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