«Environmental protection in oil and gas complex»

Study of the efficiency of carbon nitride-based catalysts for purifying water from the biocide component

UDC: 544.478.42
DOI: -

Authors:

¹ D. Mendeleev University of Chemical Technology of Russia, Moscow, Russia

Keywords: graphitic carbon nitride, biocide solution, wastewater treatment, drilling solutions, oilfield, highly intensive oxidation processes, photocatalysts, nano-powder

Annotation:

Biocide solutions are widely used in drilling fluids in the oil industry. Getting into industrial wastewater, resorcinol, as a component of drilling fluids, carries a significant environmental burden on the environment. To destroy complex organic compounds, samples of graphite-like carbon nitride (g-C3N4) with silicon and titanium doping were synthesized by thermal decomposition of melamine. The process of nanopowders formation as well as their morphology and agglomerate size, have been studied. It was shown that the main parts of the resulting catalysts are layered structures with strong bonds. The resulting catalyst samples, containing silicon in their structure, have the shape of curved sheets of nanometer size. The presence of heptazine ring structure has been proven. Based on the data obtained on low-temperature nitrogen adsorption, conclusions were drawn about the mesoporous structure of the obtained samples. Using the integral pore distribution curve, it was proven that the most probable pore size is 2…25 nm, based on which we can conclude that reactions occur on the surface of the catalysts. Studies have been carried out on the photo-oxidation of model water containing a component of the biocidal solution – resorcinol. The photocatalytic activity of the resulting graphite-like carbon nitride powders was analyzed and it was shown that g-C3N4 doped by silicon has greater activity. The efficiency of water purification from resorcinol reaches 90 %.

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