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Sorption of ammonium and phosphate ions from aqueous solutions by carbon and mineral sorbents

Zakutevskyy Oleg, Shaposhnikova Tatyana, Kotynska Lyudmila, Biedrzycka Adrianna, Skwarek Ewa

Physicochemical Problems of Mineral Processing

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2022

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Vol. 58, iss. 4

art. no. 150285

EN

A search for a sorbent capable of simultaneously extracting both phosphate anions and ammonium cations from a highly competitive medium like the biological environment of the human’s body was realized. For this purpose a comparative study of a sorption of ammonium and phosphate ions from aquatic environments in the absence of any backgrounds electrolytes and from Ringer's solution by activated charcoal, its oxidized forms and mineral amorphous sorbents – powdered titanium silicate, as well as spherically granular hydrous zirconium silicate and titanium dioxide, obtained by original methods of synthesis, as well as some of their ion-substituted forms in comparison with commercially available silica gel was carried out. The features of the sorption of ammonium cations and phosphate anions by the studied sorbents are discussed. It was established that sorption properties of the sorbents depend strongly from their chemical nature. It determines a selectivity of ion-exchange and a possibility of chemosorption processes in Ringer's solution. A relationship between the sorption of calcium cations and phosphate anions from Ringer's solution was supposed which made it possible to assume the chemosorption mechanism. Based on the sorption mechanism understanding the sorption properties of titanium silicate with respect to phosphate anions were considerable improved by converting the initial sample into Ca- and Ce-ion-substituted forms without significant loss of its high sorption properties toward ammonium cations

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Some applications of barium titanate prepared by different methods

Sydorchuk Volodymyr, Khalameida Svitlana, Skwarek Ewa, Biedrzycka Adrianna

Physicochemical Problems of Mineral Processing

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2022

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Vol. 58, iss. 2

art. no. 147192

EN

The paper presents some application of barium titanate synthesized by different methods. Barium titanate samples were prepared by four procedures: solid state, mechanochemical as direct synthesis and modification as well as hydrothermal and microwave. The obtained samples were systematically studied using X-ray diffraction, nitrogen adsorption, Fourier transform infrared spectroscopy (FTIR), potentiometric titration, and quasi-elastic light scattering and zeta potential measurements. The values of pHpzc (point of zero charge) and pHIEP (isoelectric point) characteristic of the electrical double layer were determined. The prepared samples were tested as photocatalysts under visible light. As a result, relationship between the conditions of barium titanate synthesis, its physicochemical and electrokinetic parameters, as well as photocatalytic activity under visible light was first established.

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Ograniczenie emisji i poprawa efektywności energetycznej oczyszczalni Kujawy w Krakowie

Biedrzycka Adrianna

Nowoczesne Budownictwo Inżynieryjne

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2022

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Nr 5

54--57

PL

W krakowskiej oczyszczalni Kujawy zakończyła się modernizacja węzłów przeróbki osadu nadmiernego i biogazu. Oczyszczalnia produkuje teraz więcej zielonej energii. Zyskuje na tym środowisko, gdyż mniejszy pobór energii elektrycznej z systemu dystrybucyjnego, a więc pochodzącej ze spalania węgla, oznacza mniejszą emisję gazów cieplarnianych. Oszczędności będę mieć Wodociągi Miasta Krakowa, mogąc kupować mniej energii konwencjonalnej i ograniczając jej straty.