Студенттер мен жас ғалымдардың «фараби әлемі» атты халықаралық ғылыми конференциясы
NITROGEN SELECTIVE REDUCTION OF NITRATES IN AQUEOUS ENVIRONMENT
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Сборник конф Фараби Әлемі 2023 химфак-печать
| NITROGEN SELECTIVE REDUCTION OF NITRATES IN AQUEOUS ENVIRONMENT
BY NANOCOMPOSITES APPLICATION Dyussenkulova B.Z 1,2 , Omirzakova A.T 2,3 Research supervisor: c.ch.s., senior teacher Vassilina G.K. 1,2 1 Al-Farabi Kazakh National University 2 Society of Petroleum Engineers International 3 Nazarbayev University balgyn111@gmail.com Nitrates are abundant contaminants in the groundwater’s composition. Natural nitrogen balance has nitrates in less amounts which is negligible. Agricultural sectors usually use nitrates as the source of fertilizers for vegetables and other types of flora. Excessive amounts of nitrates washed off with rainwaters to the groundwater. Consequently, nitrogen species are exceeded than allowed contamination levels for NO 3 - —N is 10ppm when 0.3ppm for NO 2 - —N due to anthropogenic factors. Nearly all nitrate removal technologies for drinking water treatment rely on biological denitrification else physicochemical separations such as ion exchange resins, electrodialysis, reverse osmosis. Biological treatments are effective for nitrogen selective reduction of nitrates; however, consume a lot of energy which was not satisfied to green ecological principles and has high cost. Nitrates remediation (nitrate to nitrogen) is preferable than nitrates valorization (nitrate to ammonium). In this case, nitrates reduction by natural catalysts is applicable which will continue about 30 days. Natural catalysts are based on support materials. Metals combination defines the selectivity of obtaining products. Natural catalysts are different by their size scale such as macro, submicron, nano, pico, etc. By decreasing of the size, the efficiency of the material increases. In this work, natural catalyst was developed on the nano size. The developed nanocomposite was In(6%)-Pt(1.5%)@BEA-MEG-3 which meant bimetallic catalysts on the surface of beta zeolite which modified by monoethylene glycol. Synthesized BEA-MEG-3 differs than common beta zeolite by the particle size and porosity including the zeta potential on the surface. Classical beta zeolites have only micropores. Modified beta zeolite has mesopores too. The main novelty of the conducted experiments is the catalytic reduction ability in 10 minutes instead of 30 days. Ammonia selectivity was about 0.2% from the reduced nitrates amount. The difference of nitrogen species gave the nitrogen gas amount. Then it could be concluded that In(6%)-Pt(1.5%)@BEA-MEG-3 reduced nitrates in 10 minutes with 99.8% of nitrogen selectivity. The research work was financially supported by SC at MEHS RK as part of №AP14870836 “Development of Catalytic Wastewater Treatment Technology for Enhanced Removal of Nitrogen Species”. «Фараби Әлемі» атты студенттер мен жас ғалымдардың халықаралық конференциясы 187 жүктеу/скачать 2,6 Mb. Достарыңызбен бөлісу:
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