Heterogeneous photocatalysis using semiconductors, e.g. TiO₂ as photocatalyst is a promising technology for the degradation of environmental pollutants. Preliminary evidence indicates that TiO₂ containing construction materials and paints efficiently destroy the ozone precursors NO and NO₂ up to 80% and 30% respectively. The materials and paints containing TiO₂ developed so far are mostly for outdoor use. In the last decades, substantial efforts made to investigate further the photocatalytic activity of materials containing TiO₂ towards priority air pollutants like NO, NO₂, and volatile organic compounds (VOCs) frequently accumulated in indoor environments. A particular asset of these studies was to modify the titanium dioxide (TiO₂) in such a way that it can be activated by visible light to use in building materials and paints used indoors, too.

使用半导体（例如TiO ₂作为光催化剂）的多相光催化技术是一种有前途的降解环境污染物的技术。初步证据表明，含TiO ₂的建筑材料和涂料有效地破坏了臭氧前体NO和NO ₂，分别高达80％和30％。迄今为止开发的含TiO ₂的材料和涂料主要用于室外。在过去的几十年中，做出了巨大的努力来进一步研究含TiO ₂的材料对诸如NO，NO _2的优先空气污染物的光催化活性。以及挥发性有机化合物（VOC）经常在室内环境中积累。这些研究的特殊资产是对二氧化钛（TiO ₂）进行了改性，使其可以被可见光激活，从而也可以用于室内的建筑材料和油漆中。