Evaluation of synthetic Birnessite utilization as a sorbent for cobalt and strontium removal from aqueous solution

Ghaly, M.; El-Dars, Farida M. S. E.; Hegazy, M.M.; Rahman, Rehab O. Abdel

doi:10.1016/j.cej.2015.09.025

Cited by 69 publications

(11 citation statements)

References 41 publications

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“…was also observed ( Figure S4) and supported by prior studies [64]. Thus, reactive sites exposed during the dissolution of clay minerals and birnessite might contribute to Cr(VI) adsorption, which would explain the poor fit of the TLM and DLM to the measured data.…”

Section: Modeling Approach For Kaolinite and Illitesupporting

confidence: 86%

Chromate adsorption on selected soil minerals: Surface complexation modeling coupled with spectroscopic investigation

Veselská

Fajgаr

Číhalová

et al. 2016

Journal of Hazardous Materials

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Section: Modeling Approach For Kaolinite and Illitesupporting

confidence: 86%

Chromate adsorption on selected soil minerals: Surface complexation modeling coupled with spectroscopic investigation

Veselská

Fajgаr

Číhalová

et al. 2016

Journal of Hazardous Materials

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“…Марганцевые минералы группы филломанганата, в частности бернессит (δ-MnO 2 ), наиболее распространены в почвах, а также в донных отложениях (Manceau et al, 2002). Исследования сорбции катионов на δ-MnO 2 (Fu et al, 1991;Zasoski, Burau, 1988;Loganathan et al, 1977;Catts, Langmuir, 1986;Metwally et al, 2017;Ghaly et al, 2016;Bevara et al, 2018) показали, что этот оксид имеет большую площадь поверхности и высокую способность сорбировать катионы, особенно тяжелые металлы. Адсорбция тяжелых металлов на бернессите происходит при более низких значениях рН по сравнению с адсорбцией на гематите, магнетите, рутиле и глиноземе (Tamura et al, 1996).…”

Section: Introductionunclassified

Adsorption of strontium on manganese oxide (δ-MnO2) at elevated temperatures: experiment and modeling

2019

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Strontium adsorption has been studied by the method of acid-base potentiometric titrations at three different temperatures: 25, 50, 75C. The effect of pH, ionic strength, sorbate/sorbent ratio, and temperature on adsorption was investigated. Experimental data were simulated using two various surface complexation models, with two different electrostatic descriptions of the interface: the constant capacitance model (CCM) and the triple-layer model (TLM). Although the both models used are able to account for the acid-base reactions and surface complexation of strontium on birnessite, we consider that the TLM is more applicable for a description of heterophaseous system H+ MnOH Sr2+. Under conditions of low ionic strength and negatively charged surface, Sr2+ ions compete with the electrolyte ions and form outer-sphere complexes along with inner-sphere complexes. Consequently, using the CCM for description of strontium adsorption data could be mathematically satisfactory, but physically senseless. The equilibrium model proposed here consists of the complexes of inner (MnOHSr2+, MnOSr+, MnOSrOH0) and outer types ([MnO Sr2+]+). The corresponding intrinsic equilibrium constants of the formation of these surface complexes were calculated for 25,50, and 75C.

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“…It can be used as a highly sensitive and selective hydrogen gas sensor [15], catalysis [16], ion exchange, and energy storage [17]. Several methods were developed to prepare the birnessite-type MnO2 structures, including hydrothermal synthesis [18], micro-emulsion route [19], sol gel [20], electro-deposition [21], and microwaveassisted route [22].…”

Section: Introductionmentioning

confidence: 99%

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Riad

Mikhail

2019

Asian J. Nanosci. Mater.

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Birnessite and manganite materials were prepared using a simple precipitation process in an alkaline medium. Potassium hydroxide and tetraethyl ammonium hydroxide (TEAH) used as the precipitating agents. Different techniques such as XRD, DSC, TGA, FT-IR, TEM and N2 adsorption analyses were employed to characterize the prepared samples. The results revealed that the formed phase in the prepared sample is dependent on the concentration of the precipitating agent. In addition, the XRD results showed the formation of various phases through controlling the concentration of the precipitating agent. Pure phase of birnessite produced in the high alkaline medium, and manganite (γ-MnOOH) at relatively low alkalinity. The samples prepared by using TEAH were well crystalline compared with the analogue one prepared by KOH. The obtained results elaborated the role of TEAH in directing the order of the particles during the preparation step.

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Evaluation of synthetic Birnessite utilization as a sorbent for cobalt and strontium removal from aqueous solution

Cited by 69 publications

References 41 publications

Chromate adsorption on selected soil minerals: Surface complexation modeling coupled with spectroscopic investigation

Chromate adsorption on selected soil minerals: Surface complexation modeling coupled with spectroscopic investigation

Adsorption of strontium on manganese oxide (δ-MnO2) at elevated temperatures: experiment and modeling

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