CdS-sensitized TiO2 in phenazopyridine photo-degradation: catalyst efficiency, stability and feasibility assessment.
CdS-sensitized TiO2 in phenazopyridine photo-degradation: catalyst efficiency, stability and feasibility assessment.
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DOI：
10.1016/j.jhazmat.2009.08.093
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发表时间：
2010-01
影响因子：
13.6
通讯作者：
A. Zyoud;Nidal Zaatar;Iyad Saadeddin;C. Ali;Daehoon Park;G. Campet;H. Hilal
中科院分区：
文献类型：
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作者：
A. Zyoud;Nidal Zaatar;Iyad Saadeddin;C. Ali;Daehoon Park;G. Campet;H. Hilal
使用纳米颗粒CdS敏化的金红石TiO 2（TiO 2/CdS，2）作为光催化剂，在太阳模拟器辐射下有效地实现了非那吡啶（1）在水中的矿化。尽管如此，2显示出两个主要缺点。首先，该系统很难通过简单的过滤回收，并且需要离心。其次，敏化剂CdS在光降解反应条件下表现出相对较高的浸出有害Cd 2+离子的倾向。为了解决这一难题，将2号种子固定在沙面上。砂/TiO 2/CdS系统，3，更容易回收，但显示出略低的催化活性相比，2。另一方面，载体不能防止Cd 2+的浸出。这表明有限的未来适用性的CdS敏化的二氧化钛光催化剂系统，在太阳能为基础的水净化策略，除非浸出的倾向是完全防止。
Mineralization of phenazopyridine, 1, in water, under solar-simulator radiation was efficiently achieved using nanoparticle CdS-sensitized rutile TiO2, TiO2/CdS, 2, as photo-catalysts. Despite that, 2 showed two main drawbacks. Firstly, the system was difficult to recover by simple filtration, and demanded centrifugation. Secondly, the sensitizer CdS showed relatively high tendency to leach out hazardous Cd2+ions under photo-degradation reaction conditions. In an attempt to solve out such difficulties, 2 was supported onto sand surface. The sand/TiO2/CdS system, 3, was easier to recover but showed slightly lower catalytic activity compared to 2. On the other hand, the support failed to prevent leaching of Cd2+. This indicates limited future applicability of CdS-sensitized TiO2photo-catalyst systems, in solar-based water purification strategies, unless leaching out tendency is completely prevented.