Synthesis, characterization and study of arsenate adsorption from aqueous solution by α- and δ-phase manganese dioxide nanoadsorbents

Singh, Mandeep; Thanh, Dong Nguyen; Ulbrich, Pavel; Strnadová, Nina; Štěpánek, František

doi:10.1016/j.jssc.2010.09.023

Cited by 65 publications

(15 citation statements)

References 34 publications

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“…α-MnO 2 powder was prepared as previously described 51 . Briefly, 1.10 g potassium permanganate (KMnO 4 ) was dissolved in 20 ml double-distilled water and the resulting mixture was stirred for 30 min at 60 °C.…”

Section: Methodsmentioning

confidence: 99%

Regulating proton-coupled electron transfer for efficient water splitting by manganese oxides at neutral pH

et al. 2014

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Manganese oxides have been extensively investigated as model systems for the oxygen-evolving complex of photosystem II. However, most bioinspired catalysts are inefficient at neutral pH and functional similarity to the oxygen-evolving complex has been rarely achieved with manganese. Here we report the regulation of proton-coupled electron transfer involved in water oxidation by manganese oxides. Pyridine and its derivatives, which have pKa values intermediate to the water ligand bound to manganese(II) and manganese(III), are used as proton-coupled electron transfer induction reagents. The induction of concerted proton-coupled electron transfer is demonstrated by the detection of deuterium kinetic isotope effects and compliance of the reactions with the libido rule. Although proton-coupled electron transfer regulation is essential for the facial redox change of manganese in photosystem II, most manganese oxides impair these regulatory mechanisms. Thus, the present findings may provide a new design rationale for functional analogues of the oxygen-evolving complex for efficient water splitting at neutral pH.

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Section: Methodsmentioning

confidence: 99%

Regulating proton-coupled electron transfer for efficient water splitting by manganese oxides at neutral pH

et al. 2014

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“…[35][36][37][38] In the present work hydrothermal method is followed to synthesize MnO 2 nanostructures due to its simplicity, low cost and effectiveness. We have effectively utilized hydrothermal technique to synthesize two different polymorphs (a and b) of MnO 2 nanocacti as well as nanorods without using any seed, capping agent or template.…”

Section: Introductionmentioning

confidence: 99%

Morphology and phase tuning of α- and β-MnO₂nanocacti evolved at varying modes of acid count for their well-coordinated energy storage and visible-light-driven photocatalytic behaviour

et al. 2017

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“…As can be seen in Figure 4(a), at the low pH values, the uptake of cobalt(II) ion on the material surfaces decreases because of two main reasons. The first reason is due to the charge of the material surface, which is positive and is not favorable for the uptake of Co(II) cation [33][34][35][36][37][38]. The second reason is that there is a competition between the H + and Co 2+ ions [37,38].…”

Section: Factors Affecting the Adsorption Of Cobaltmentioning

confidence: 99%

Determination of Cobalt in Seawater Using Neutron Activation Analysis after Preconcentration by Adsorption ontoγ-MnO₂Nanomaterial

Dinh

Nguyen³

et al. 2018

Journal of Chemistry

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The -MnO 2 nanomaterial has been used to adsorb cobalt in the seawater at Phan Thiet City, Binh Thuan Province, Vietnam. Its concentration is determined by using the neutron activation analysis (NAA) method at the Dalat nuclear research reactor. Factors affecting the uptake of cobalt on the -MnO 2 material such as the pH, adsorption time, and initial cobalt(II) concentration are investigated. The irradiated experiment data are calculated using the K0-Dalat program. The results obtained show that the trace dissolved cobalt in Phan Thiet seawater is found equal to 0.25 ± 0.04 g/L ( = 5, = 95%) with the adsorption efficiency being higher than 95% ( = 4, = 95%).

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Synthesis, characterization and study of arsenate adsorption from aqueous solution by α- and δ-phase manganese dioxide nanoadsorbents

Cited by 65 publications

References 34 publications

Regulating proton-coupled electron transfer for efficient water splitting by manganese oxides at neutral pH

Regulating proton-coupled electron transfer for efficient water splitting by manganese oxides at neutral pH

Morphology and phase tuning of α- and β-MnO₂nanocacti evolved at varying modes of acid count for their well-coordinated energy storage and visible-light-driven photocatalytic behaviour

Determination of Cobalt in Seawater Using Neutron Activation Analysis after Preconcentration by Adsorption ontoγ-MnO₂Nanomaterial

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Synthesis, characterization and study of arsenate adsorption from aqueous solution by α- and δ-phase manganese dioxide nanoadsorbents

Cited by 65 publications

References 34 publications

Regulating proton-coupled electron transfer for efficient water splitting by manganese oxides at neutral pH

Regulating proton-coupled electron transfer for efficient water splitting by manganese oxides at neutral pH

Morphology and phase tuning of α- and β-MnO2nanocacti evolved at varying modes of acid count for their well-coordinated energy storage and visible-light-driven photocatalytic behaviour

Determination of Cobalt in Seawater Using Neutron Activation Analysis after Preconcentration by Adsorption ontoγ-MnO2Nanomaterial

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Morphology and phase tuning of α- and β-MnO₂nanocacti evolved at varying modes of acid count for their well-coordinated energy storage and visible-light-driven photocatalytic behaviour

Determination of Cobalt in Seawater Using Neutron Activation Analysis after Preconcentration by Adsorption ontoγ-MnO₂Nanomaterial