Вода і водоочисні технології. Науково-технічні вісті, № 2(33)

Постійне посилання зібрання

https://ela.kpi.ua/handle/123456789/53922

Переглянути

Перегляд Вода і водоочисні технології. Науково-технічні вісті, № 2(33) за Ключові слова "dyes"

Зараз показуємо 1 - 2 з 2
  • Ескіз
    ДокументВідкритий доступ
    Investigation of natural flocculants for use in wastewater purification processes
    (КПІ ім. Ігоря Сікорського; ТОВ «Українська водна спілка», 2022) Solodovnik, T. V.; Yakymenko, I. K.
    Contaminated industrial wastewater significantly reduces the volume of drinking water. A wide range of composition and insufficient treatment of wastewater from enterprises such as the textile, chemical or metalworking industries, which often fall into water bodies, negatively affect the state of aquatic ecosystems, and that is why it is necessary to carefully select the optimal treatment method. Among the types of wastewater treatment, the coagulation-flocculation process has gained considerable popularity, which occurs due to the adhesive and adsorption properties of coagulants and flocculants, which is widely used in the purification technologies of both natural and industrial wastewater from colloidal particles, radionuclides, phosphates, dyes and suspended particles. Coagulants are able to hydrolyze in water with the formation of various coagulation structures with high adsorption and adhesion properties, flocculants, in turn, contribute to the formation of flakes, sedimentation and filtration, stabilize the cleaning process, improve quality and increase the efficiency of equipment. During the experimental work, the employees of the Department of Chemical Technology and Water Treatment established the advantages of using natural flocculants in the process of wastewater treatment using colored model solutions as an example. A study was made of the influence on the degree of purification of such characteristics as the type of flocculant (for example, chitosan and sodium alginate) and coagulant (Al2(SO4)3-18H2O, ALS, PIX-318), the optimal dose of reagents, the type of dye (direct, active, dispersed) , settling time and content of residual ions. During the research, the Jar-test method was used, the essence of which is to simulate the process of floc formation, which is typical for industrial wastewater treatment plants. The study of the composition of model water samples was carried out using the spectrophotometric analysis method.
  • Ескіз
    ДокументВідкритий доступ
    Synthesis of TIO2 by solvothermal method and its photocatalytic activity towards Biseptol and Congo red
    (КПІ ім. Ігоря Сікорського; ТОВ «Українська водна спілка», 2022) Aleksyk, A.; Yanushevska, O.; Dontsova, T.
    The creation of ceramic membranes with additional functional properties, such as antibacterial and photocatalytic, is a popular and promising area of research in the field of water treatment. The article is devoted to the synthesis of titanium (IV) oxide powders by the solvothermal method for their further usage as a photocatalytic selective layer in ceramic membranes. The study of the peculiarities of the photocatalytic materials synthesis for the creation of photocatalytic and at the same time antimicrobial ceramic membranes on their basis is extremely relevant, because it will allow to develop a method of synthesis of photocatalysts active to various pollutants. Therefore, the aim of the work was the synthesis of TiO2 powders by solvothermal method at different ratios of the starting reagents, the study of their physicochemical properties and the study of their photocatalytic properties in relation to different pollutant – antibiotics and dyes. The obtained powders were characterized by diffraction analysis, infrared spectroscopy, low-temperature nitrogen adsorptiondesorption and scanning electron microscopy. It is established that the ratio of the initial components significantly affects the final properties and characteristics of TiO2 powders. It was shown that the synthesis with a significant excess of the starting reagent (titanium isopropoxide) does not lead to the crystalline TiO2 sample, which was confirmed by diffraction analysis and infrared spectroscopy. The revealed porous structure of all TiO2 samples indicates a high specific surface area in them, which is also consistent with scanning electron microscopy studies. The highest photocatalytic activity is possessed by TiO2 samples, which are nanocomposites of anatase and rutile modifications. Such nanocomposites showed quite high activity towards antibiotics (Biseptol) and anionic dyes (Congo red).