Adsorption of selenite and selenate by nanocrystalline aluminum oxide, neat and impregnated in chitosan beads

Yamani, Jamila S.; Lounsbury, Amanda W.; Zimmerman, Julie

doi:10.1016/j.watres.2013.10.054

Cited by 124 publications

(100 citation statements)

References 44 publications

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“…To address its environmental concerns, studies have been performed to remove selenium species from water and soil, or to retard its migration. A few materials were tested for this purpose, including iron oxide [4][5][6], alumina [7,8], and titania [9]. In particular, iron containing oxide, hydroxide, and minerals has been the most extensively studied for this purpose [3,[10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Selenite and Selenate by Metal Oxides Studied with Fluorescent DNA Probes for Analytical Application

Liu

2017

J. Anal. Test.

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Selenium is a required micronutrient at low concentrations, while it becomes toxic at high concentrations. Inorganic selenium exists mainly as SeO 3 2-(selenite or Se(IV)) and SeO 4 2-(selenate or Se(VI)). Currently, few biosensors can effectively measure these selenium species in water. In this work, we study the adsorption of selenite/ selenate by various metal oxide nanoparticles including CeO 2 , CoO, Cr 2 O 3 , Fe 2 O 3 , Fe 3 O 4 , In 2 O 3 , Mn 2 O 3 , NiO, TiO 2 , and ZnO. Fluorescently-labeled DNA molecules are used as probes and first adsorbed on these oxides, resulting in quenched fluorescence. Upon addition of selenite, the DNA probes are displaced from the surface with fluorescence recovered for six out of the ten oxides, while the response to selenate was much lower in all the cases. The signaling is optimal below 400 mM NaCl at near neutral pH when Fe 3 O 4 nanoparticles were used. Quantitative studies were performed on three oxides with detection limits for selenite being 0.3 lM (CeO 2 ), 2.0 lM (Fe 3 O 4 ), and 3.0 lM (Fe 2 O 3 ), respectively. The system, however, is also responsive to a few other anions such as phosphate and arsenate. Therefore, it can be used as a method for analyzing selenium species when the system is known to be free of such competing anions. This study represents the first effort of designing selenite sensors using DNA as probes, and it may stimulate related work for this important analyte.

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Section: Introductionmentioning

confidence: 99%

Adsorption of Selenite and Selenate by Metal Oxides Studied with Fluorescent DNA Probes for Analytical Application

Liu

2017

J. Anal. Test.

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“…It has been reported that the adsorption of anions at the oxide/water interfaces is generally assumed to take place via a surface complexation mechanism. [21][22][23][24][25][26][27][28][29][30][31][32][33][34] No reports have been published to date on the relationship between Bayer electrofilter fines (BEFs) and their ability to adsorb selenate ions. The aim of this study is to examine the adsorption of selenate ions from an aqueous solution onto BEFs.…”

Section: àmentioning

confidence: 99%

“…Similar phenomena have also been reported by other researchers using other adsorbents. 18,23,31,38 According to the Se(VI) speciation distribution diagram, the H 2 SeO 4 , HSeO 4 À , and SeO 4 2À species are present at pH <4, whereas only the SeO 4 2À species is present in the solution at a pH of between 4 and 10. 8 In all cases, the sorption of selenium decreases at alkaline pH as was expected considering the surface charge and in view of the decrease in the fraction of the aqueous HSeO 4 À species.…”

Section: Effect Of Phmentioning

confidence: 99%

Bayer Electrofilter Fines as Potential Se(VI) Adsorbents

Ayala

Fernández

2015

JOM

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“…A variety of treatment methods have been studied for Se removal from contaminated waters, including ion-exchange [9], reverse osmosis [10], zero-valent iron [11], microbial reduction [12], chemical precipitation [13], a hybrid electro-coagulation membrane process [14] and adsorption [15][16][17][18][19][20][21][22][23]. Among these, adsorption is believed to be the most promising process and has been studied extensively.…”

Section: Introductionmentioning

confidence: 99%

“…Among these, adsorption is believed to be the most promising process and has been studied extensively. Metal oxides such as various iron (Fe) oxides and aluminum (Al) oxide have been demonstrated to be effective adsorbents for Se removal [15,18,20,[22][23][24]. Coagulation by Al and Fe salts is an important water treatment process and has been widely used in drinking water plants.…”

Section: Introductionmentioning

confidence: 99%

Removal of Se(IV) and Se(VI) from drinking water by coagulation

Chen

et al. 2015

Separation and Purification Technology

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a b s t r a c t Selenium (Se) is one of contaminants required to be regulated during drinking water treatment, however, little information has been collected to date regarding Se removal by coagulation. In this study, the performance of Se removal by coagulation has been evaluated with respect to the dependence on Se species, coagulant type, water pH and interfering ions. The results showed that a Fe-based coagulant was much more efficient than Al-based coagulants in Se removal. The removal of selenite (Se(IV)) by coagulation was much more pronounced than that of selenate (Se(VI)). With an FC dosage of more than 0.4 mM Fe/L, Se(IV) removal efficiency of more than 98% could be achieved when the initial Se(IV) concentration was 250 lg/L. For Al-based coagulants (AlCl 3 (AC) and polyaluminum chloride (PACl)) Se removal efficiency was positively correlated with the content of Al 13 species during the coagulation process. Adsorption onto hydroxide flocs was the most active coagulation mechanism for Se removal and precipitation also played specific roles at low dosage, especially for Se(IV) removal and with Fe coagulant. High coagulant dosage and weakly acidic pH could enhance the formation of hydroxide flocs having more active adsorption sites and high zeta potential, and thus favored Se removal. These findings are important to understand the efficiency and mechanisms of Se removal by coagulation.

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Adsorption of selenite and selenate by nanocrystalline aluminum oxide, neat and impregnated in chitosan beads

Cited by 124 publications

References 44 publications

Adsorption of Selenite and Selenate by Metal Oxides Studied with Fluorescent DNA Probes for Analytical Application

Adsorption of Selenite and Selenate by Metal Oxides Studied with Fluorescent DNA Probes for Analytical Application

Bayer Electrofilter Fines as Potential Se(VI) Adsorbents

Removal of Se(IV) and Se(VI) from drinking water by coagulation

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