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首页> 外文期刊>RSC Advances >Mesoporous TiO2 encapsulating a visible-light responsive upconversion agent for enhanced sonocatalytic degradation of bisphenol-A
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Mesoporous TiO2 encapsulating a visible-light responsive upconversion agent for enhanced sonocatalytic degradation of bisphenol-A

机译：介孔TiO2包封了可见光响应性上转化剂，用于增强双酚-A的单偶催化降解

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摘要

Herein, we report the integration of a visible-light active upconversion agent (Er: Y2O3) with mesoporous TiO2 via a modified two-step sol-gel coating method. The resultant material possesses a well-defined core-shell structure with a good upconversion property and exhibits uniform worm-like mesopores (similar to 3.8 nm), a high BET surface area (similar to 151.5 m(2) g(-1)) and a large pore volume (similar to 0.23 cm(3) g(-1)). The composite was demonstrated as an advanced sonocatalyst, showing a superior degradation performance for bisphenol-A (BPA). The effect of the erbium dopant content on the upconversion property and sonocatalytic performance was evaluated for the production of the best sonocatalyst. We found that the maximum pseudo first-order reaction rate constant in the presence of the composite with an Er3+ content of 3 wt% in Y2O3 nanocrystals is calculated to be 0.155 min(-1), which is 2.9 and 2 times larger than that of US alone (0.054 min(-1)) and hollow structured mesoporous TiO2 (0.077 min(-1)), respectively. More importantly, the degradation rate is much higher than that of the sonocatalysts reported previously for treatment of BPA (0.09-0.14 min(-1)). The superior catalytic activity can be attributed to an intensified cavitation reaction zone and an enhanced amount of photo-generated charges. Moreover, the recycling test shows that a constant catalytic activity is retained even after 4 cycles. This study paves a promising way for the development of a multi-functional catalyst for sonochemical processes.
机译：在此，我们通过改性的两步溶胶 - 凝胶涂布方法报告可见光活性上转化剂（ER：Y2O3）与中孔TiO2的整合。所得材料具有良好的核 - 壳结构，具有良好的上转化性能，并且表现出均匀的蠕虫叶片（类似于3.8nm），高BET表面积（类似于151.5m（2）g（-1））和大的孔体积（类似于0.23cm（3 )g（-1））。复合材料被证明为先进的儿童催留性，显示出对双酚-A（BPA）的优异降解性能。评价铒掺杂剂含量对升级性质和同胞催化性能的影响，用于生产最佳的儿童催留性。我们发现，在Y2O3纳米晶体中，在Y 2 O 3纳米晶体中存在的复合材料存在的最大伪第一阶反应速率恒定为0.155 min（-1），比其为0.155分钟（-1），为2.9倍和2倍我们单独（0.054分钟（-1））和中空结构化介孔TiO2（0.077分钟（-1））。更重要的是，降解率远高于先前用于治疗BPA的儿童催留催化剂（0.09-0.14分钟（-1））。优异的催化活性可归因于强化的空化反应区和增强量的光产生电荷。此外，再循环试验表明甚至在4个循环后均未保留恒定的催化活性。本研究铺平了一种有希望的方式，用于开发多功能催化剂用于多官能催化剂进行多种功能性催化剂。

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  • 来源
    《RSC Advances》 |2016年第44期|共9页
  • 作者

    Qiu Pengpeng; Thokchom Binota; Choi Jongbok; Cui Mingcan; Kim Hong-Dae; Han Zhengchang; Kim Dukmin; Khim Jeehyeong;

  • 作者单位

    Korea Univ Sch Civil Environm &

    Architecture Engn Seoul 136701 South Korea;

    Korea Univ Sch Civil Environm &

    Architecture Engn Seoul 136701 South Korea;

    Korea Univ Sch Civil Environm &

    Architecture Engn Seoul 136701 South Korea;

    Korea Univ Sch Civil Environm &

    Architecture Engn Seoul 136701 South Korea;

    Korea Inst Ind Technol Ulsan Reg Div Ulsan 681310 South Korea;

    G W Environm Ning Rd 6 Chem Ind Pk Nanjing Jiangsu Peoples R China;

    Mine Reclamat Corp Inst Mine Reclamat Technol Seoul South Korea;

    Korea Univ Sch Civil Environm &

    Architecture Engn Seoul 136701 South Korea;

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