INVESTIGATION OF ANALYTICAL TEST SYSTEMS OBTAINED USING MICROPOROUS BLOCK COPOLYMERS
Rubrics: 2. CHEMICAL TECHNOLOGY
Authors:
1.
Kazanskiy nacional'nyy issledovatel'skiy tehnologicheskiy universitet
2.
Kazanskiy nacional'nyy issledovatel'skiy tehnologicheskiy universitet
3.
Kazanskiy gosudarstvennyy energeticheskiy universitet
4.
Kazanskiy nacional'nyy issledovatel'skiy tehnologicheskiy universitet
5.
KNITU
Type:
Article
Pages:
from 63
to 68
Status:
In work
Language:
Russian
Keywords:
BLOCK COPOLYMERS, MODIFICATION, NANOSIZED ORGANOSUBSTITUTED SILICAS, SORPTION CAPACITY, ANALYTICAL TEST SYSTEMS
Abstract (English):
Sensor membrane materials play a key role in determining metal ions in their aqueous solutions. The performance of ion exchange membranes, particularly their speed and effectiveness, is directly linked to their internal structure and physical form. Block copolymers, frequently considered promising materials for sensor membranes, exhibit a remarkable characteristic known as microphase separation. This phenomenon, occurring both in solid and dissolved states, plays a crucial role in influencing the membrane's ion exchange capabilities. The desire for separation and self-organization leads to the formation of microscopic areas enriched with a specific type of blocks. In some cases, voids may appear in such polymers, the inner surface of which can absorb analytical reagents. Due to the existence of free space in the voids formed, complexation reactions can occur, causing analytical reactions to the ions of the metals being determined. This study explores the synthesis of microporous block copolymers. The research utilizes poloxamer, a block copolymer composed of propylene and ethylene oxides, modified with hydroxyl and potassium alcoholate functionalities. This modified poloxamer is subsequently reacted with an asymmetric aromatic diisocyanate, 2,4-toluene diisocyanate, to create the desired microporous structure. Non-sticky nanosized organo-substituted silicas ASiP-Cu-0.5 were used as modifiers. The obtained polymers were applied to polyethylene terephthalate film used as a substrate. As a result, a sensor test system was manufactured and investigated using 1-(2-pyridylazo)-2-naphthol as an analytical reagent for Cu(II)ions and PHENAZO for determining magnesium(II) ions. PHENAZO is a highly sensitive and selective reagent for spectrophotometric analysis of magnesium ions. Its unique ability to form a distinctive blue-violet complex with magnesium enables accurate detection. The reagent itself is crimson in color, but its complex with magnesium exhibits maximum light absorption at 560 nanometers, compared to the reagent's peak absorption at 490 nanometers. This sensitivity is further amplified by immobilizing PHENAZO on modified microporous block copolymers. This innovative approach creates highly effective substrates for determining magnesium and copper ions in aqueous solutions, making them valuable tools for practical applications in analytical chemistry.
Sensor membrane materials play a key role in determining metal ions in their aqueous solutions. The performance of ion exchange membranes, particularly their speed and effectiveness, is directly linked to their internal structure and physical form. Block copolymers, frequently considered promising materials for sensor membranes, exhibit a remarkable characteristic known as microphase separation. This phenomenon, occurring both in solid and dissolved states, plays a crucial role in influencing the membrane's ion exchange capabilities. The desire for separation and self-organization leads to the formation of microscopic areas enriched with a specific type of blocks. In some cases, voids may appear in such polymers, the inner surface of which can absorb analytical reagents. Due to the existence of free space in the voids formed, complexation reactions can occur, causing analytical reactions to the ions of the metals being determined. This study explores the synthesis of microporous block copolymers. The research utilizes poloxamer, a block copolymer composed of propylene and ethylene oxides, modified with hydroxyl and potassium alcoholate functionalities. This modified poloxamer is subsequently reacted with an asymmetric aromatic diisocyanate, 2,4-toluene diisocyanate, to create the desired microporous structure. Non-sticky nanosized organo-substituted silicas ASiP-Cu-0.5 were used as modifiers. The obtained polymers were applied to polyethylene terephthalate film used as a substrate. As a result, a sensor test system was manufactured and investigated using 1-(2-pyridylazo)-2-naphthol as an analytical reagent for Cu(II)ions and PHENAZO for determining magnesium(II) ions. PHENAZO is a highly sensitive and selective reagent for spectrophotometric analysis of magnesium ions. Its unique ability to form a distinctive blue-violet complex with magnesium enables accurate detection. The reagent itself is crimson in color, but its complex with magnesium exhibits maximum light absorption at 560 nanometers, compared to the reagent's peak absorption at 490 nanometers. This sensitivity is further amplified by immobilizing PHENAZO on modified microporous block copolymers. This innovative approach creates highly effective substrates for determining magnesium and copper ions in aqueous solutions, making them valuable tools for practical applications in analytical chemistry.
Keywords:
BLOCK COPOLYMERS, MODIFICATION, NANOSIZED ORGANOSUBSTITUTED SILICAS, SORPTION CAPACITY, ANALYTICAL TEST SYSTEMS
BLOCK COPOLYMERS, MODIFICATION, NANOSIZED ORGANOSUBSTITUTED SILICAS, SORPTION CAPACITY, ANALYTICAL TEST SYSTEMS
