Introduction

The patented technology regards photocatalytic compositions, containing graphene, usable in several substrates that are able to reduce atmospheric and water pollution. Application of TiO2-based photocatalysts to cementitious materials is the subject of many researches in the last two decades. The application of TiO2-based photocatalysts to cementitious materials is mainly aimed at achieving two goals, the depolluting action due to the oxidation of NOx present in the atmosphere to NO3- and the self-cleaning effect of the photocatalytic cement surface. As regard to depollution, NOx emission reduction is a focus of environmental regulations. In Europe, the values are specified in the European Union (EU) directives (e.g., 2008/50/EC).

Technical features

A photocatalytic compositions comprising a photocatalyst and a graphene material. These compositions can be used as substrates (paint, plaster, cementitious composition, gypsum, hydraulic binder, etc.) particularly for reducing pollution in air or water. The preparation of the photocatalyst is a process not requiring high-temperature heating or addition of toxic surfactants. Studies shows up to 40% enhancement in photodegradation, and the catalyst is 50-70% more efficient in reducing NOx than current photocatalysts. It maintains its photodegradation activity over time.

Possible Applications

• Production of paint, plaster, cementitous composition, gypsum, hydraulic binder, etc.

Advantages

• Efficient photocatalytic action;
• Scalable and economical;
• No release of toxic substances;
• Surface cleaning;
• Reduction of pollutants.