Degradação de corantes e poluentes emergentes utilizando fotocatalisadores homogêneos e heterogêneos a base de molibdênio

Abstract

Water is a fundamental natural resource for life, economic development and social wellbeing, having an infinity of uses, from the simplest to the most complex. Despite being a public good, it has gradually become a scarce resource that needs to be handled with great discernment. In the last year the world population had a growth rate of 0.9%, indicating an increase of 67 million people (Brazil had a growth rate of 0.5%, indicating an increase of 1.1 million people), which also provides an increase in water consumption. And consequently there will be an increase in demand for food and use of water resources for its production, as well as in various industrial activities. In this sense, it becomes increasingly important to find new ways to treat effluents, especially agricultural ones, whose activity is responsible for the highest percentage of water consumption. In this way, photocatalytic degradation appears to be very promising, since depending on the percentage of removal of harmful agents, it would be possible to reuse the effluent in some activities in the agricultural environment, thus reducing water consumption. In this work it was possible to synthesize and characterize molybdenum-based compounds modified for photodegradation of the Rhodamine B molecule and a real agricultural effluent. Among the three compounds for homogeneous reactions, MoPH was the one that presented the most promising results for dye removal (above 90% of Rhodamine B in 5 hours of reaction). Therefore, this material was used for the photodegradation reactions of the agricultural effluent, obtaining a reduction of approximately 75% of carbon percentage.