Izvestiya of Saratov University.
ISSN 1816-9775 (Print)
ISSN 2541-8971 (Online)


Химия

Photocatalytic water purification from phenol and formaldehyde

Industrial development leads to an increasing number of persistent and highly toxic organic compounds such as phenol and formaldehyde. Chemical oxidation processes (in particular, photooxidation) are widely used for water treatment and wastewater and groundwater treatment. As part of the work done, an assessment of the possibility of using photocatalysis for post-treatment of wastewater from phenol, formaldehyde, and their mixtures has been carried out.

Application of cationic dye pyronin G (Y) for quantitative extraction-photometric determination of higher carboxylic acids in fi sh

The relevance of this study is due to the need to develop methods for the extraction and quantitative determination of higher carboxylic acids in fi sh. In this work, we propose a simple, inexpensive, and highly sensitive extraction-photometric technique for the selective determination of the total content of fatty acids.

Synthesis and some properties of colloidal quantum dots of mercury selenide

The synthesis of colloidal quantum dots of mercury selenide using mercury oxide as a precursor is proposed. The proposed method is characterized by the use of a less toxic component in the reaction mixture - mercury oxide. The transmission electron microscopy method established an average diameter of 5–6 nm and the shape of quantum dots. A histogram of the size distribution of synthesized nanoparticles is presented. An important property of the synthesized nanoparticles is the crystal structure established by X-ray diff raction analysis.

Modern methods of controlled radical polymerization for obtaining branched polymers of acrylamide, acrylic acid and (met)acrylates

 A search and analysis has been carried out of English-language 2005–2020 scientifi c literature devoted to methods of obtaining branched (co)polymers of acrylamide, acrylic acid and (met)acrylates in order to obtain novel materials with valuable properties. It has been found that modern methods of controlled radical polymerization are mainly used for this purpose, namely, atom transfer radical polymerization (ATRP), reversible addition-fragmentation chain transfer polymerization (RAFT) and group transfer polymerization (GTP).

Interaction of 3H-furan-2-ones and 4-oxobutanoic acids with 2-(aminophenyl)methanol

Reactions of 4-oxobutanoic acids as well as their cyclic analogues 3H-furan-2-ones with 1,3-binucleophilic reagent (2-aminophenyl) methanol lead to the formation of 1-R-5H-benzo[d]pyrrolo[2,1-b][1,3]oxazines and 3a-R-2,3,3a-trihydro-5H-benzo[d]pyrrolo[2,1-b][1,3]oxazin1-ones, respectively. Quantum-chemical calculations of the Fukui reactivity indices and local hardness have substantiated the mechanisms of the reactions carried out.

ВЛИЯНИЕ ОРГАНИЧЕСКИХ И НЕОРГАНИЧЕСКИХ ВЕЩЕСТВ, СОДЕРЖАЩИХСЯ В ПИТЬЕВОЙ ВОДЕ, НА ЕЕ КАЧЕСТВО И ЗДОРОВЬЕ НАСЕЛЕНИЯ

Вода является одним из ключевых факторов здоровья человека. Качество питьевой воды – глобальная проблема современного человечества. Практически все ее источники подвергаются антропогенному и техногенному воздействию разной интенсивности. Проблема качества питьевой воды актуальна как в глобальном масштабе, так и в рамках отдельно взятого региона или населенного пункта.

Определение загрязнения атмосферного воздуха по физико-химическим характеристикам талого снега

Состояние окружающей среды в городах определяется степенью загрязнения отдельных компонентов окружающей среды. Геохимические аномалии в городских агломерациях часто образуются в депонирующих загрязнение средах: почвенный, снежный покров, донные отложения. Приоритетными в системе мониторинга компонентов окружающей среды являются наблюдения за состоянием атмосферного воздуха как наиболее опасного источника загрязнения с прямым экологическим воз-действием. Цель исследования – экологический мониторинг антропогенного воздействия на атмосферный воздух в разных районах г.

Получение новых замещённых имидазолоновых производных на основе 1-(2-оксо-2-фенилэтилиден)пирроло[3,2,1-ij]хинолин-2-онов

В настоящей работе продемонстрирована возможность получения новых биологически активных молекул, содержащих в своей структуре привилегированный фрагмент имидазолона, посредством катализируемого кислотой Бренстеда взаимодействия 1,3-диметилмочевины с 1-(2-оксо-2-фенилэтилиден)пирроло[3,2,1-ij]хинолин-2-онами. Наличие активной оксоилиденовой системы в последних позволяет вводить данные соединения в реакции циклизации с различными бинуклеофильными агентами.

Evaluation of the sorption properties of coastal sands in relation to emulsified petroleum products

The sorption properties of some sands selected in the coastal zones of economically important, but at the same time ecologically oppressed territories of Vietnam are considered. The purpose of the research is to assess the absorption capacity of sands in relation to emulsifi ed petroleum products, to identify their ecological role in typical situations of spillage of small amounts of toxic substances. It is shown that the sorption qualities of the sands depend on the location of the sands, their geochemical and granulometric heterogeneity.

Prospects for the use of polymer-containing materials and sorbents for membrane ultrafi ltration, sorption and concentration of nucleic acids from aqueous media. A review

Unlike antibiotics and heavy metals, nucleic acids exist in the aquatic environment as a part of prokaryotic and eukaryotic microorganisms (bacteria, fungi, etc.) rather than in a free form. In this regard, the most important primary stage of sample preparation of an object for the quantitative analysis of DNA and RNA in natural and wastewaters includes membrane ultrafi ltration of an aqueous sample, followed by its sorption preconcentration on a solid phase carrier.

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