School of Material Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China.
J Hazard Mater. 2013 Sep 15;260:112-21. doi: 10.1016/j.jhazmat.2013.05.005. Epub 2013 May 13.
Although photocatalysis has been actively surveyed on removing organic pollutants in ultraviolet (UV) environment, because of lacking UV in solar exposure, photodegradation is difficult to be considerably degraded in conventional exposure condition. In this work, an innovative approach was proposed to compensate for it, which was developed in model wastewater using thermal sensitizer at room temperature. At the optimal component condition, the removal rate of adsorption and thermocatalytic degradation processes can reach the highest level of 82.07% solely response to temperature in the dark. Moreover, the kinetics of degradation rate was modeled considering that it was found similarly to Langmuir-Hinshelwood behavior, and a tentative mechanism was objectively established, describing reasonably well in line with the experimental results. On the other hand, it was found that high amount of methylene blue (MB) adsorbed onto thermal sensitizer was of unambiguous importance to subsequent thermocatalytic performance. Briefly, all above suggest that the feasibility to the thermodegradation route has been successfully verified under room temperature excitation. Herein the insight into degradation pattern of dye over thermal excitation may further enlarge applications for wastewater treatment.
虽然光催化在去除紫外（UV）环境中的有机污染物方面已经得到了积极的研究，但由于太阳辐射中缺乏 UV，在常规暴露条件下，光降解很难得到显著降解。在这项工作中，提出了一种创新的方法来弥补这一不足，该方法在模型废水中使用室温下的热敏剂进行开发。在最佳成分条件下，仅在黑暗中响应温度，吸附和热催化降解过程的去除率就可以达到 82.07%的最高水平。此外，考虑到降解速率动力学与 Langmuir-Hinshelwood 行为相似，对其进行了建模，并建立了一个合理的假设机制，与实验结果吻合得很好。另一方面，研究发现，吸附在热敏剂上的大量亚甲基蓝（MB）对随后的热催化性能具有重要意义。简而言之，所有这些都表明，在室温激发下，热降解途径的可行性已得到成功验证。本文对热激发下染料降解模式的深入了解可能会进一步扩大废水处理的应用范围。
