Hybrid composites based on technical cellulose from rice husk

Shapovalova, Irina; Вураско, А. В.; Petrov, L. A.; Kraus, Eduard; Leicht, Heinrich; Heilig, Michael; Stoyanov, O. V.

doi:10.1002/app.45796

Cited by 8 publications

(8 citation statements)

References 24 publications

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“…Cellulose matrices. Production of plant-based pulp was carried out in two stages: the first stage -alkaline treatment [13], the second stage -oxygen-organosolv pulping [14,15]. After delignification, the pulp was washed with distilled water and ground.…”

Section: Methodsmentioning

confidence: 99%

“…It was noticed the only RH matrix was uniformly stained due to the high content of epidermal fibres in outer layer of a seed. Epidermal fibres contain up to 30% mineral components by the end of the growing season [14,19,20]. While growing, two processes occur simultaneously within the cell wall: formation of the supramolecular structure of cellulose and accumulation of silica dioxide [21].…”

Section: Studies Of Modified Cellulose-containing Matricesmentioning

confidence: 99%

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Study of Technical Cellulose as a Matrix-Sorbent to Develop Express Analytic System for Water Safety Control

Maslakova

Вураско

Pervova

et al. 2021

JCPRM

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The study presented by the authors is devoted to the study of the properties and the possibility of using technical cellulose from non-wood plant raw materials as a solid-phase matrix to obtain solid-phase reactive indicator systems by the following methods: synthesis method on the base of a hetarylformazane immobilized on a cellulose matrix and development of analytical systems based on preconcentration of the determined metal ion by a matrix with subsequent its «revealing» by the formazan («revealing» method). The article focuses on determination of optimal combinations of chromogenic organic reagents (hetarylformazanes) and cellulose-based matrices for developing solid-phase reaction-based indicator systems. Adsorption features of formazan reagents onto cellulose matrices was studied. It has been established the relation between the reagent molecule structure, composition of cellulose matrix and analytical properties of the test-systems synthesized to determine metal ions. Different approaches were developed and applied to reveal the visually observable and easily measured effect due to cellulose properties as well as properties of hetarylformazanes fixed on the surface of the matrix. This fact allows to control sensitivity and selectivity of solid-phase reactive indicator systems for water quality assessment.

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Section: Methodsmentioning

confidence: 99%

Section: Studies Of Modified Cellulose-containing Matricesmentioning

confidence: 99%

Study of Technical Cellulose as a Matrix-Sorbent to Develop Express Analytic System for Water Safety Control

Maslakova

Вураско

Pervova

et al. 2021

JCPRM

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“…Затем высушивали на воздухе до полного испарения растворителя. Пропитанную ТЭОС и высушенную целлюлозу подвергали гидролизу в водно-аммиачной атмосфере в течение 72 ч, затем высушивали при 80 С до постоянного веса [Шишмаков и др., 2012;Шаповалова и др., 2016;Shapovalova et al, 2018]. Количество закрепившегося на поверхности целлюлозных волокон диоксида кремния рассчитывали весовым методом.…”

Section: содержание основных компонентов в растительном сырьеunclassified

“…4). Это подтверждает ранее проведенные исследования, где установлено, что SiO 2 , остающийся в технической целлюлозе, полученной окислительно-органосольвентным способом из РШ, по данным рентгеноструктурного анализа находится в аморфном состоянии [Shapovalova et al, 2018 Наличие аморфного характера диоксида кремния, входящего в состав минерального компонента технической целлюлозы (образец № 7) подтверждается микрофотографиями (рис. 5).…”

Section: содержание основных компонентов в растительном сырьеunclassified

Catalase activity of natural and synthesized on technical cellulosesilicon dioxide

Шаповалова¹,

Вураско²,

Агеев³

2021

Известия СПбЛТА

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Дана оценка влияния свойств природного и синтезированного на технической целлюлозе из рисовой и овсяной шелухи диоксида кремния на каталазную активность диоксидсодержащих материалов. Техническую целлюлозу из шелухи получали окислительно-органосольвентным способом. Закрепление диоксида кремния на целлюлозе проводили золь-гель методом с применением тетраэтоксисилана. Свойства полученных диоксидсодержащих материалов оценивали: рентгеноструктурным анализом, методом тепловой десорбции азота, эмиссионным спектральным анализом с индукционно-связанной плазмой. Каталазную активность диоксидсодержащих материалов оценивали по модельной реакции разложения Н2О2. В ходе работы получены образцы целлюлозы: из рисовой шелухи с содержании зольного остатка от 0,3 до 33,5%; из овсяной и рисовой шелухи без содержания минеральных компонентов. Золь-гель методом получены материалы с содержанием синтетического диоксида кремния от 0 до 47,2% на основе рисовой шелухи и от 0 до 44,3% на основе овсяной шелухи. Установлено, что количество закрепленного диоксида кремния золь-гель методом не зависит от природы технической целлюлозы. Диоксид кремния остающийся в технической целлюлозе находится в аморфном состоянии. Максимум удельной поверхности (20,4 м2/г) достигается при предельном содержанием диоксида кремния (30,3%). Синтезированный на технической целлюлозе золь-гель методом диоксид кремния находится в кристаллическом состоянии, при этом максимальная удельная поверхность составляет для диоксидсодержащего материала на основе ОШ 18,5 м2/г, а для диоксидсодержащего материала на основе РШ 15,7 м2/г); Выявлено, что каталазной активностью обладает диоксидсодержащий материал с природным диоксидом кремния. Такой каталазный эффект можно объяснить наличием примесей в виде металлов, которые накапливаются в минеральном компоненте растительного сырья при вегетации. Образцы целлюлозы с синтезированным диоксидом кремния каталазной активностью не обладают, независимо от удельной поверхности и содержания SiO2. The influence of the properties of natural and synthesized silicon dioxide on technical cellulose from rice and oat husks on the catalase activity of dioxidecontaining materials is estimated. Technical cellulose from the husk was obtained by the oxidative-organosolvent method. The fixation of silicon dioxide on cellulose was carried out by the sol-gel method using tetraethoxysilane. The properties of the obtained dioxide-containing materials were investigated by X-ray diffraction analysis, nitrogen thermal desorption method, inductively coupled plasmaemission spectroscopy. The catalase activity of the dioxide-containing materials was evaluated by the model reaction of Н2О2 decomposition. In the course of the work, the following samples of cellulose were obtained: one from rice husks with an ash content of 0.3 to 33.5%; one from oat and rice husks without mineral components. The sol-gel method was used to obtain materials with a content of synthetic silicon dioxide from 0 to 47.2% based on rice husk and from 0 to 44.3% based on oat husk. It was established that the amount of fixed silicon dioxide by the sol-gel method does not depend on the origin of the technical cellulose. The silicon dioxide remaining in the technical cellulose is in an amorphous state. The maximum specific surface area (20.4 m2/g) is achieved at the limiting silicon dioxide content (30.3%). The silicon dioxide synthesized on technical cellulose by the sol-gel method is in a crystalline state, with the maximum specific surface area being 18.5 m2/g for a dioxide-containing material based on OH, and 15.7 m2/g for a dioxide-containing material based on RH; It was found that dioxide-containing material with natural silicon dioxide possesses the catalase activity. This catalase effect can be explained by the presence of impurities in the form of metals, which are accumulated in the mineral component of plant raw materials during the vegetation. Cellulose samples with synthesized silicon dioxide do not have catalase activity, independently from specific surface area and SiO2 content.

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“…It can be extracted from plants and trees in purest form by simple and nontoxic methods. Apart from this, cellulose can also be extracted in crystalline and amorphous forms from agricultural wastes like sugar cane bagasse, − rice husk, − corncob, − and grain straws . Likewise, high amounts of accessible biopolymers such as chitosan, agarose, and carrageenan originate in the seas.…”

Section: Advantages Of Biopolymer-based Electrolytes Over Other Conve...mentioning

confidence: 99%

Biopolymer-Based Electrolytes for Dye-Sensitized Solar Cells: A Critical Review

2020

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Continual escalation of our world population demands a vast and safe energy supply, the majority of which has been produced by fossil fuel sources. However, because of the huge energy demand, exponential depletion of these nonrenewable energy sources is inescapable and forthcoming in the coming century. Hence, utilization of renewable energy such as solar energy has gained attention because of its direct conversion of light energy into electrical power without any harmful environmental impacts. Solar energy has been harvested by different types of solar cells varying from inorganic to organic to the combination of both. Among them, the dye-sensitized solar cell (DSSC) with a biopolymer-based electrolyte has gained enormous consideration from researchers because of its sustainability, abundance of available raw material, low production cost, and easy production in addition to the low volatilization of electrolytes compared to liquid state electrolytes. This review aims to give an overview of the recent inputs in the development of biopolymer-based DSSCs. The performance of the biopolymers as electrolytes in DSSCs will be critically reviewed based on the physicochemical properties of the biopolymers. Key technical challenges and future research areas for the advancement of biopolymer-based DSSCs are also discussed.

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Hybrid composites based on technical cellulose from rice husk

Cited by 8 publications

References 24 publications

Study of Technical Cellulose as a Matrix-Sorbent to Develop Express Analytic System for Water Safety Control

Study of Technical Cellulose as a Matrix-Sorbent to Develop Express Analytic System for Water Safety Control

Catalase activity of natural and synthesized on technical cellulosesilicon dioxide

Biopolymer-Based Electrolytes for Dye-Sensitized Solar Cells: A Critical Review

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