College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha, Hunan 410082, China.
College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha, Hunan 410082, China.
Water Res. 2015 Aug 1;79:128-46. doi: 10.1016/j.watres.2015.04.038. Epub 2015 May 7.
The pollutants classified as "persistent organic pollutants (POPs)", are being subject to high concern among the scientific community due to their persistence in the environment. TiO2-based photocatalytic process has shown a great potential as a low-cost, environmentally friendly and sustainable treatment technology to remove POPs in sewage to overcome the shortcomings of the conventional technologies. However, this technology suffers from some main technical barriers that impede its commercialization, i.e., the inefficient exploitation of visible light, low adsorption capacity for hydrophobic contaminants, uniform distribution in aqueous suspension and post-recovery of the TiO2 particles after water treatment. To improve the photocatalytic efficiency of TiO2, many studies have been carried out with the aim of eliminating the limitations mentioned above. This review summarizes the recently developed countermeasures for improving the performance of TiO2-based photocatalytic degradation of organic pollutants with respect to the visible-light photocatalytic activity, adsorption capacity, stability and separability. The performance of various TiO2-based photocatalytic processes for POPs degradation and the underlying mechanisms were summarized and discussed. The future research needs for TiO2-based technology are suggested accordingly. This review will significantly improve our understanding of the process of photocatalytic degradation of POPs by TiO2-based particles and provide useful information to scientists and engineers who work in this field.
被归类为“持久性有机污染物 (POPs)”的污染物由于其在环境中的持久性而引起科学界的高度关注。基于 TiO2 的光催化工艺作为一种低成本、环保且可持续的处理技术，具有去除污水中 POPs 的巨大潜力，克服了传统技术的缺点。然而，该技术存在一些主要的技术障碍，阻碍了其商业化，即对可见光的利用效率低、对疏水性污染物的吸附能力低、在水悬浮液中的均匀分布以及水处理后 TiO2 颗粒的回收。为了提高 TiO2 的光催化效率，已经进行了许多研究，旨在消除上述限制。本综述总结了最近为提高 TiO2 基光催化降解有机污染物的性能而开发的对策，涉及可见光光催化活性、吸附能力、稳定性和可分离性。总结并讨论了各种基于 TiO2 的光催化工艺对 POPs 降解的性能及相关机理。相应地提出了对 TiO2 基技术的未来研究需求。本综述将显著提高我们对基于 TiO2 的颗粒光催化降解 POPs 过程的理解，并为该领域的科学家和工程师提供有用的信息。
