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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:Y _(2) O _(3) ) with mesoporous TiO _(2) 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 (～3.8 nm), a high BET surface area (～151.5 m ~(2) g ~(?1) ) and a large pore volume (～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 Er ~(3+) content of 3 wt% in Y _(2) O _(3) 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 TiO _(2) (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：Y _（2）O _（3））与中孔TiO_（2）的整合。所得材料具有明确定义的核 - 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（〜3.8nm），高BET表面积（〜151.5m〜（2）g〜（？1））和大的孔体积（〜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Y _（2）O _（3）纳米晶体中的3wt％3wt％的ER〜（3+）含量在复合材料存在下最大的伪第一阶反应速率常数计算为0.155分钟〜 （？1），它们单独的2.9倍和2倍（0.054分钟〜（α1））和中空结构化介孔TiO _（2）（0.077min〜（？1））。更重要的是，降解速率远高于先前用于治疗BPA（0.09-0.14分钟〜（？1））的儿童催化剂。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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