Russian Journal of Biological Physics and Chemisrty Russian Journal of Biological Physics and Chemisrty АКТУАЛЬНЫЕ ВОПРОСЫ БИОЛОГИЧЕСКОЙ ФИЗИКИ И ХИМИИ 2499-9962 54537 МЕДИЦИНСКАЯ БИОФИЗИКА И БИОФИЗИЧЕСКАЯ ХИМИЯ MEDICAL BIOPHYSICS AND BIOPHYSICAL CHEMISTRY МЕДИЦИНСКАЯ БИОФИЗИКА И БИОФИЗИЧЕСКАЯ ХИМИЯ Investigation of some physical and chemical properties of nepheline concentrate based silicon sorbents Исследование некоторых физико-химических свойств кремниевых сорбентов, полученных на основе нефелинового концентрата Веляев Ю О Velyaev Yu O velyaevyo@yandex.ru Майоров Д В Maiorov D V Севастопольский государственный университет ru Sevastopol State University ru Институт химии и технологии редких элементов и минерального сырья им. И.В. Тананаева - обособленное подразделение ФГБУН ФИЦ «Кольский научный центр РАН» (ИХТРЭМС КНЦ РАН) ru Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Kola Science Center Russian Academy of Sciences ru 25 06 2020 25 06 2020 5 2 354 358 20 06 2020 20 06 2020 https://rusjbpc.ru/en/nauka/article/54537/view

В работе показана возможность получения на основе кислотного разложения нефелинового концентрата высокоэффективных кремниевых сорбентов с заданными структурно-поверхностными свойствами - удельными поверхностью и объемом, диаметром частиц и др. Приведены физико-химические свойства образцов диоксида кремния, полученных разложением нефелинового концентрата азотной и серной кислотами, причём при вскрытии нефелина раствором серной кислоты предложено использовать системы H2SO4-H2O и H2SO4-C2H5OH. Приведены данные по сорбции-десорбции и распределению объема пор по их диаметру полученных образцов SiO2, на основании которых сделаны выводы о типе и форме пор, преобладающих в образцах. Показано, что из нефелина могут быть получены как мезо-, так и микро- и макропористые кремнезёмы с развитой удельной поверхностью (285¸600 м2/г). Сделан вывод о том, что на основе нефелинового концентрата могут быть получены кремниевые сорбенты с контролируемыми структурно-поверхностными свойствами.

The paper shows the possibility of obtaining high-performance silicon sorbents based on acid decomposition of nepheline concentrate with specified structural and surface properties - specific surface area and volume, particle diameter, etc. The physical and chemical properties of silicon dioxide samples obtained by decomposition of nepheline concentrate with nitric and sulfuric acids are given, and it is proposed to use the systems H2SO4-H2O and H2SO4-C2H5OH when opening nepheline with a solution of sulfuric acid. Data on sorption-desorption and distribution of pore volume by their diameter of the SiO2 samples obtained are given. Conclusions are made about the type and shape of the pores prevailing in the samples. It is shown that both meso-and micro - and macroporous silicas with a developed specific surface area (285¸600 m2/g) can be obtained from nepheline. It is concluded that silicon sorbents with controlled structural and surface properties can be obtained on the basis of nepheline concentrate.

 аморфный диоксид кремния нефелин сорбция удельная поверхность пористая структура amorphous silicon dioxide nepheline sorption BET surface area porous structure

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