Sorption of Fluoride Ions onto Cellulose and Aluminum Oxide Composites
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ICAL CHEMISTRY OF SOLUTIONS
Sorption of Fluoride Ions onto Cellulose and Aluminum Oxide Composites A. V. Dolganova, A. V. Balandinaa, *, D. B. Chugunova, A. S. Timoninaa, and A. V. Knyazevb aOgarev
National Research Mordovia State University, Saransk, 430005 Russia bLobachevsky University, Nizhny Novgorod, 603950 Russia *e-mail: [email protected]
Received March 3, 2020; revised June 10, 2020; accepted June 27, 2020
Abstract—Sorption properties of a composite based on microcrystalline cellulose and nanosized aluminum oxide film immobilized on its surface in removal of fluoride ions from water are studied. The optimal thickness of the sorbent layer at which the maximum sorption of fluoride ions occurs is 50 nm. The effects of various parameters, such as the solution pH and sorption time, on sorption are studied. The kinetic parameters of sorption and the rate-controlling step of the process are determined. The ion exchange mechanism of fluoride ion sorption onto the prepared sorbent is confirmed by IR spectroscopy. DOI: 10.1134/S0036023620110030
Among the aforementioned methods, absorption is considered the most efficient technique for fluorine removal due to its low cost, high performance and environmental sustainability.
Bahena et al. [18] studied the mechanism of adsorption onto α-Al2O3; Valdivieso et al. [19] investigated the influence of temperature on this process. Extensive research focused on activated Al2O3 with its surface modified using lanthanum(III) and yttrium(III) compounds [20] or manganese oxide [21], via impregnation with alum [22], by applying copper oxide [23], or magnesial activation [24] has been conducted. The methods for fluorine removal from water using adsorbents based on TiO2 [25], bismuth and aluminum titanate [26], and manganese and cerium oxides [27] have been reported in literature. Inorganic composite materials containing natural polymers draw researchers’ attention to be potentially used as adsorbents due to a number of advantages they have. Cellulose is the most abundant renewable biopolymer on the Earth [28, 29]. It is also affordable, safe, and has a well-developed surface. In this study, we investigated the adsorption properties of microcrystalline cellulose, with an aluminum oxide nanolayer applied onto its surface using atomic layer deposition (ALD) technology. The resulting composite material was used to study sorption of fluoride ions from water, investigate the dependence of sorption capacity on the thickness of aluminum oxide layer, contact time between the solution and the sorbent, and solution pH. The kinetic parameters of this process were also determined.
It was shown in a number of studies that the efficiency of fluorine removal is strongly dependent on solution pH [16, 17]; the most efficient adsorption of fluoride ions takes place at pH 5–7.
EXPERIMENTAL All reagents used in this study were of chemically pure or pure for analysis grade: alizarin complexon
INTRODUCTION Fluorine is one of the essential elements found in the human body, and it exhibits a therapeut
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