Adsorption of Co, Ni, Cu, and Zn on hydrous manganese dioxide from complex electrolyte solutions resembling sea water in major ion content

Kanungo, S. B.; Tripathy, S. Swarupa; Rajeev, .

doi:10.1016/s0021-9797(03)00464-8

Cited by 42 publications

(13 citation statements)

References 22 publications

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“…4). These results are similar to those obtained in previous studies on the adsorption behavior of Zn (II) on various adsorbent materials such as mixed column clays [34]; geopolymeric Linz-Donawitz powder [35] and hydrous manganese dioxide [36]. Thanh et al [32] reported that four mechanisms such as complex formation, ion exchange, dissolution-precipitation and electrostatic interaction on the adsorbent surface are effective on metal retention by magnetite composite and raw hydroxyapatite adsorbents.…”

Section: (A) (B) (C) (D)supporting

confidence: 89%

A Study On the Zn(II) Separation Efficiency of Chemically Synthesized Hydroxyapatite (HAp) Particles

Dizle

Uysal

2021

Aksaray University Journal of Science and Engineering

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In this study, hydroxyapatite particles (HAp) were chemically synthesized by using coprecipitation method to determine their capabilities on the sorption of Zn(II) ions from aqueous solutions. HAp particles were chosen because of their low cost for production, high stability, easy to use, and effective sorption power. In order to determine the operation conditions of the adsorption system to be installed when this adsorbent is desired to be used in field applications, parameters such as system pH, initial Zn(II) concentration and adsorbent concentrations have been optimized. Properties and functional structure of the adsorbent materials were characterized by using SEM, FTIR, and EDX analyzes. The kinetic behavior of Zn(II) adsorption with HAp was consistent with the pseudo second order kinetic model. Additionally, the equilibrium states of the adsorption processes were studied by using Langmuir, Freundlich, Temkin, Scatchard and Dubinin-Radushkevich (D-R) isotherm models. The maximum sorption capacity HAp was obtained as 500 mg/g, and best removal value of 91% were determined at pH of 6.0, optimum adsorbent concentration of 3.75 g/L, in 25 mg/L Zn(II) concentration and optimum mixing time of 45 min. This study showed that the HAp can be considered an effective adsorbent on the Zn(II) removal from wastewater.

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Section: (A) (B) (C) (D)supporting

confidence: 89%

A Study On the Zn(II) Separation Efficiency of Chemically Synthesized Hydroxyapatite (HAp) Particles

Dizle

Uysal

2021

Aksaray University Journal of Science and Engineering

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“…It should be noted that although Cu is highly particle relative with respect to Fe-Mn (oxyhydr)oxide surfaces (Catts & Langmuir, 1986;Kanungo & Tripathy, 2004;Tessier et al, 1996), the release of Cu from desorption…”

Section: Controls On Marine Cu Distributionsmentioning

confidence: 99%

Characterizing the Roles of Biogeochemical Cycling and Ocean Circulation in Regulating Marine Copper Distributions

Cui

Gnanadesikan

2022

JGR Oceans

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Copper (Cu) is a key micronutrient for marine phytoplankton. Its oceanic biogeochemical cycle has elicited considerable attention due to dissolved Cu exhibiting a unique linear profile with depth. Several processes have been proposed for explaining this behavior. In this study, we characterize the relationships between the observed Cu, PO43−, and Si on a global scale. We find that the depth profiles of Cu resemble those of Si more than of PO43− in the global ocean. To understand their relationships, we couple the biogeochemical and internal circulation processes in a model, fitting optimal Cu:PO43− uptake ratios and remineralization length‐scales to replicate the marine Cu distributions. The modeling results suggest that Cu uptake needs in the Southern Ocean are substantially higher than those in other oceanic regions. In addition, our modeling results indicate a deep Cu remineralization in the global ocean. We offer an alternative mechanism that relies on biogeochemical cycling and internal circulation to produce the linear depth profiles of dissolved Cu. Our results suggest that diatoms are likely the major phytoplankton dominating oceanic Cu cycling.

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“…S3. This phenomenon, also known as ''isomorphic substitution'', has been encountered by other researchers (Kanungo et al, 2004). Divalent cations, such as Ni(II) or Cu(II), can readily substitute for Mn(II) in the manganese oxide lattice to counterbalance the charge that develops during dissolution of Mn(IV) to Mn(III) and (II) (Nicolas-Tolentino et al, 1999).…”

Section: àmentioning

confidence: 87%

Reaction of aqueous Cu–Citrate with MnO2 birnessite: Characterization of Mn dissolution, oxidation products and surface interactions

Jefferson

Liu

et al. 2015

Chemosphere

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Adsorption of Co, Ni, Cu, and Zn on hydrous manganese dioxide from complex electrolyte solutions resembling sea water in major ion content

Cited by 42 publications

References 22 publications

A Study On the Zn(II) Separation Efficiency of Chemically Synthesized Hydroxyapatite (HAp) Particles

A Study On the Zn(II) Separation Efficiency of Chemically Synthesized Hydroxyapatite (HAp) Particles

Characterizing the Roles of Biogeochemical Cycling and Ocean Circulation in Regulating Marine Copper Distributions

Reaction of aqueous Cu–Citrate with MnO2 birnessite: Characterization of Mn dissolution, oxidation products and surface interactions

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