Silica and silica–titania sol–gel materials: Synthesis and analytical application

Моросанова, Е. И.

doi:10.1016/j.talanta.2012.07.043

Cited by 46 publications

(19 citation statements)

References 92 publications

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“…The sol-gel preparation procedure, not only being a rather easy way to prepare catalyst materials, provides advantages over the SiO 2 -TiO 2 preparation process [6,8,9]. The sol-gel preparation steps include sol (colloid suspension) preparation, alkoxysilane hydrolysis, and condensation of silica and titania precursors.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Activity Studies of Vanadia/Silica–Titania Catalysts in SVOC Partial Oxidation to Formaldehyde: Focus on the Catalyst Composition

et al. 2018

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Abstract:In this work, silica-titania supported catalysts were prepared by a sol-gel method with various compositions. Vanadia was impregnated on SiO 2 -TiO 2 with different loadings, and materials were investigated in the partial oxidation of methanol and methyl mercaptan to formaldehyde. The materials were characterized by using N 2 physisorption, X-ray diffraction (XRD), X-ray fluorescence spectroscopy (XRF), X-ray photoelectron spectroscopy (XPS), Scanning transmission electron microscope (STEM), NH 3 -TPD, and Raman techniques. The activity results show the high importance of an optimized SiO 2 -TiO 2 ratio to reach a high reactant conversion and formaldehyde yield. The characteristics of mixed oxides ensure a better dispersion of the active phase on the support and in this way increase the activity of the catalysts. The addition of vanadium pentoxide on the support lowered the optimal temperature of the reaction significantly. Increasing the vanadia loading from 1.5% to 2.5% did not result in higher formaldehyde concentration. Over the 1.5%V 2 O 5 /SiO 2 + 30%TiO 2 catalyst, the optimal selectivity was reached at 415 • C when the maximum formaldehyde concentration was~1000 ppm.

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Section: Introductionmentioning

confidence: 99%

Catalytic Activity Studies of Vanadia/Silica–Titania Catalysts in SVOC Partial Oxidation to Formaldehyde: Focus on the Catalyst Composition

et al. 2018

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“…На основании про-веденных нами ранее исследований была установ-лена способность родственных реагентов к комплек-сообразованию с кремний-титановыми ксерогелями. В данной работе использовали порошки кремний-ти-тановых ксерогелей (Si-Ti) со следующими характе-ристиками: площадь поверхности 535 м 2 /г, площадь микропор 314 м 2 /г, общий объем пор 0.3 см 3 /г, объем микропор 0.14 см 3 /г, средний размер пор 19 Å. Твердофазная спектрофотометрия была ис-пользована для выбора условий и последующего определения фторид-ионов благодаря достаточной оптической прозрачности влажных порошков этих материалов в тонких слоях (≤ 1 мм) [11].…”

Section: результаты их обсуждениеunclassified

“…Недавно нами была установ-лена способность кремний-титановых золь-гель материалов к комплексообразованию с полифе-нолами, дофамином и пероксидом водорода [9][10][11].…”

Section: Introductionunclassified

The use of silica-titania xerogels for the solid phase spectrophotometric determination of fluoride ions in the artificial saliva

Morosanova¹,

Samodelov²,

Моросанова³

2015

АиК

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Поступила в редакцию 27 августа 2015 г., после исправлений -22 сентября 2015 г.Для твердофазно-спектрофотометрического определения фторид-ионов в искусственной слю-не были предложены и использованы новые индикаторные материалы -модифицированные пиро-катехиновым фиолетовым кремний-титановые ксерогели. Определение основано на разрушении окрашенных комплексов иммобилизованного титана(IV) с пирокатехиновым фиолетовым фторид-ионами. Выбраны условия комплексообразования титана(IV), включенного в матрицу кремний-ти-тановых ксерогелей, с пирокатехиновым фиолетовым и условия разрушения иммобилизованных окрашенных соединений в присутствии фторид-ионов. Разработаны методики твердофазно-спек-трофотометрического определения фторид-ионов в искусственной слюне: в зависимости от объе-ма анализируемого раствора диапазоны определяемых содержаний составляют 0.05-1 мг/л (предел обнаружения 0.02 мг/л) и 5-100 мг/л (предел обнаружения 2 мг/л). Правильность методик провере-на методом «введено-найдено», относительное стандартное отклонение -0.05-0.23. Время ана-лиза 10 минут.Ключевые слова: фторид-ионы, определение, искусственная слюна, твердофазная спек-трофотометрия, кремний-титановые ксерогели. Silica-titania xerogels modified with the pyrocatechol violet have been proposed as new sensor materials for fluoride determination in the artificial saliva. The determination is based on the ability of fluoride ions to disrupt the colored titanium(IV)-pyrocatechol violet complexes. The complex reactions of matrix embedded titanium(IV) with pyrocatechol violet (resulting in blue colored xerogels) and with fluoride ions (resulting in bleaching of colored xerogels) have been investigated. The selected conditions have been used for developing the procedures of fluoride determination in the artificial saliva and water. Varying the volume of the analyzed solution two analytical ranges (0.05-1 ppm (LOD 2 ppm) and 5-100 ppm (LOD 0.02 ppm)) have been obtained. The procedures' accuracy has been evaluated using the spiked probes of the artificial saliva achieving the RSD of 5-23%. The developed sensor materials can be used for studying the efficiency of various fluor-containing products for medical diagnostics, scientific research, and also for the construction of new dental materials.

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“…Mesoporous materials are finding many applications in the fields of science and technology as adsorbents, supports for catalysis and sensing elements [1][2][3]. Owing to large surface area and uniform pore-size distribution [4] that can be tuned to fit dimensions of biomolecules, mesoporous materials have also been applied in biosensors as advanced immobilization matrix impregnated with biomolecules [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

An adhesive conducting electrode material based on commercial mesoporous titanium dioxide as a support for Horseradish peroxidase for bioelectrochemical applications

Rahemi

Trashin

Meynen

et al. 2016

Talanta

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An adhesive conducting electrode material containing of graphite, biocompatible ion exchange polymer nafion(®) and commercial mesoporous TiO2 impregnated with horseradish peroxidase (HRP) is prepared and characterized by amperometric, UV-vis and N2 sorption methods. The factors influencing the performance of the resulting biosensor are studied in detail. The optimal electrode material consists of 45% graphite, 50% impregnated HRP-TiO2 and 5% nafion(®). The optimum conditions for H2O2 reduction are an applied potential of -0.3 V and 0.1 mM hydroquinone. Sensitivity and limit of detection in the optimum conditions are 1 A M(-1) cm(-2) and 1 µM correspondingly. The N2 sorption results show that the pore volume of TiO2 decreases sharply upon adsorption of HRP. The preparation process of the proposed enzyme electrode is straightforward and potentially can be used for preparation of carbon paste electrodes for bioelectrochemical detections.

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Silica and silica–titania sol–gel materials: Synthesis and analytical application

Cited by 46 publications

References 92 publications

Catalytic Activity Studies of Vanadia/Silica–Titania Catalysts in SVOC Partial Oxidation to Formaldehyde: Focus on the Catalyst Composition

Catalytic Activity Studies of Vanadia/Silica–Titania Catalysts in SVOC Partial Oxidation to Formaldehyde: Focus on the Catalyst Composition

The use of silica-titania xerogels for the solid phase spectrophotometric determination of fluoride ions in the artificial saliva

An adhesive conducting electrode material based on commercial mesoporous titanium dioxide as a support for Horseradish peroxidase for bioelectrochemical applications

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