COMPOSITE PLATINUM NANOPARTICLES-MODIFIED MATERIAL WITH PHOTO-OXIDANT PROPERTIES EXTENDED IN ULTRAVIOLET AND VISIBLE RANGE, FOR DEGRADING ORGANIC POLLUTANTS, AND PREPARATION PROCESS

摘要

The invention relates to a process for preparing a composite material modified with platinum nanoparticles, for degrading organic pollutants in waste water. According to the invention, the process consists in mixing a flying ash fraction of 40 μ m with NaOH in a mass ratio of 1:1.2, followed by a heat treatment at a temperature of 500°C, for 3 h, and cooling down to the ambient temperature when titanium dioxide is added to the ground mixture in a ratio of 1:1, as well as polyethylene glycol and bidistilled water, to result in a suspension which is subjected to hydrothermal synthesis at a temperature of 100°C, while stirring continuously at 300 rpm, for 24 h, ageing, separation and drying of the resulting composite material which is further wetted with a dispersion of Pt nanoparticles functionalized with cysteamine monochlorohydrate 3M and subjected to ultrasonication, filtration, drying at the temperature of 105...115°C, for 12 h, t result in a composite material with dual adsorbent and photo-catalyst properties in ultraviolet and visible spectrum range.