Abstract. Highly selective molecularly imprinted nanocomposites MIP RhB -PPy/TiO 2 were successfully prepared by surface molecular imprinting technique with rhodamine B (RhB) as template molecule. The prepared MIP RhB -PPy/TiO 2 coated with a thin imprinted layer could respond to visible light. The static and dynamic binding experiments revealed that MIP RhB -PPy/TiO 2 possessed strong affinity, high adsorption capacity and fast adsorption rate for RhB. The selectivity experiments indicated that MIP RhB -PPy/TiO 2 had excellent recognition selectivity for RhB. Selective photocatalytic degradation experiments indicated that the apparent rate constant (k) for the photodegradation of RhB over MIP RhB -PPy/TiO 2 is 0.0158 min -1 , being 3.6 times of that over non-imprinted nanocomposites NIP-PPy/TiO 2 (0.0044 min -1 ). Compared with the NIP-PPy/TiO 2 , MIP RhB -PPy/TiO 2 showed higher photocatalytic selectivity toward RhB under visible light, which was attributed the introduction of the imprinted cavities on the surface of MIP RhB -PPy/TiO 2 . Moreover, MIP RhB -PPy/TiO 2 exhibited high reusability and stability. The results indicate that molecularly imprinted nanocomposites MIP RhB -PPy/TiO 2 have a promising perspective in industrial wastewater treatment.

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Volatile organic compounds (VOCs) in indoor air are considered a major threat to human health and environmental safety. The development of applicable technologies for the removal of VOCs is urgently needed. Nowadays, photocatalytic oxidation (PCO) based on metal-containing photocatalysts has been regarded as a promising method. However, unmodified photocatalysts are generally limited in applications because of the narrow light response range and high recombination rate of photo-generated carriers. As a result, nano metal-containing photocatalysts doped with elements or other materials have attracted much attention from researchers and has developed over the past few decades. In addition, different doping types cause different levels of catalyst performance, and the mechanism for performance improving is also different. However, there are few reviews focusing on this aspect, which is really important for catalyst design and application. This work aims to give a comprehensive overview of nano metal-containing photocatalysts with different doping types for the removal of VOCs in an indoor environment. First, the undoped photocatalysts and the basic mechanism of PCO is introduced. Then, the application of metal doping, non-metal doping, co-doping, and other material doping in synthetic metal-containing photocatalysts are discussed and compared, respectively, and the synthesis methods, removal efficiency, and mechanisms are further investigated. Finally, a development trend for using nano metal-containing photocatalysts for the removal of VOCs in the future is proposed. This work provides a meaningful reference for selecting effective strategies to develop novel photocatalysts for the removal of VOCs in the future.