Effects of calcium ions on surface characteristics and adsorptive properties of hydrous manganese dioxide

Liu, Ruiping; Liu, Huijuan; Qiang, Zhimin; Qu, Jiuhui; Li, Guibai; Wang, Dongsheng

doi:10.1016/j.jcis.2008.11.051

Cited by 75 publications

(33 citation statements)

References 13 publications

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“…The synchronous spectrum of NMO laden with different Cs + contents is shown in The bands at 1020 and 875 cm -1 were increased with increasing metal ion content, and 13 they may be assigned to vibration of the surface hydroxyl groups combined with M atoms [34,36,37]. It was also noted that the intensity of the correlation peak at 875 cm -1 in the case of Co 2+ adsorption was very high, and other correlation peaks could not be observed.…”

Section: The Region 1200-800 CM -1mentioning

confidence: 99%

Cesium and cobalt adsorption on synthetic nano manganese oxide: A two dimensional infra-red correlation spectroscopic investigation

Lafi

Abdullah

2015

Journal of Molecular Structure

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Section: The Region 1200-800 CM -1mentioning

confidence: 99%

Cesium and cobalt adsorption on synthetic nano manganese oxide: A two dimensional infra-red correlation spectroscopic investigation

Lafi

Abdullah

2015

Journal of Molecular Structure

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“…They showed that Ca 2+ can facilitate δMnO 2 aggregation. The adsorption of carboxylate is also enhanced more significantly by Ca 2+ (Liu et al 2009). It is possible that Ca 2+ has an important role in aggregating the manganese-calcium core around the OEC of photosystem II.…”

Section: Resultsmentioning

confidence: 97%

“…It is possible that there is a direct reaction between deposit and support (Harriman et al 1988). Recently, Liu et al (2009) reported the effects of calcium ions (Ca 2+ ) on the surface characteristics and adsorptive properties of hydrous manganese dioxide (δMnO 2 ) (Liu et al 2009). They showed that Ca 2+ can facilitate δMnO 2 aggregation.…”

Section: Resultsmentioning

confidence: 99%

Amorphous Manganese-Calcium Oxides as a Possible Evolutionary Origin for the CaMn4 Cluster in Photosystem II

Najafpour

2010

Orig Life Evol Biosph

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In this paper a few calcium-manganese oxides and calcium-manganese minerals are studied as catalysts for water oxidation. The natural mineral marokite is also studied as a catalyst for water oxidation for the first time. Marokite is made up of edge-sharing Mn(3+) in a distorted octahedral environment and eight-coordinate Ca(2+) centered polyhedral layers. The structure is similar to recent models of the oxygen evolving complex in photosystem II. Thus, the oxygen evolving complex in photosystem II does not have an unusual structure and could be synthesized hydrothermally. Also in this paper, oxygen evolution is studied with marokite (CaMn₂O₄), pyrolusite (MnO₂) and compared with hollandite (Ba(0.2)Ca(0.15)K(0.3)Mn(6.9)Al(0.2)Si(0.3)O(16)), hausmannite (Mn₃O₄), Mn₂O₃.H₂O, Ca Mn₃O₆.H₂O, CaMn₄O₈.H₂O, CaMn₂O₄.H₂O and synthetic marokite (CaMn₂O₄). I propose that the origin of the oxygen evolving complex in photosystem II resulted from absorption of calcium and manganese ions that were precipitated together in the archean oceans by protocyanobacteria because of changing pH from ~5 to ~8-10. As reported in this paper, amorphous calcium-manganese oxides with different ratios of manganese and calcium are effective catalysts for water oxidation. The bond types and lengths of the calcium and manganese ions in the calcium-manganese oxides are directly comparable to those in the OEC. This primitive structure of these amorphous calcium-manganese compounds could be changed and modified by environmental groups (amino acids) to form the oxygen evolving complex in photosystem II.

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“…has previously shown to promote the catalytic hydrolysis of diethyl ethylphosphonothiolate (DEEP) (Bartram and Wagner 2003). As an important functional metal oxide, MnO 2 is among the most attractive representatives of inorganic materials exhibiting such a rich physical and chemical properties and wide applications in various fields such as catalysis, ion exchange, molecular adsorption, sensing and energy storage (Jiao and Frei 2010;Koivula et al 2009;Liu et al 2009;Wang et al 2011;Yan et al 2012). MnO 2 is a very interesting material because of the diversity in its crystalline structure and high manganese valence (Shen et al 1993;Cao and Suib 1994;Qi et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Manganese dioxide nanoparticles-silver-Y zeolite as a nanocomposite catalyst for the decontamination reactions of O, S-diethyl methyl phosphonothiolate

Dastafkan

Sadeghi

Obeydavi

2014

Int. J. Environ. Sci. Technol.

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The decontamination reactions of O,S-diethyl methyl phosphonothiolate, as an agricultural organophosphorous pesticide onto 20 wt% loaded manganese dioxide nanoparticles-silver-Y zeolite as a nanocomposite catalyst in different solvents, were evaluated and monitored by means of gas chromatography-flame ionization detector and gas chromatography-mass spectrometry. Prior to the reaction, the catalyst was synthesized in three steps: at first, sodium-Y zeolite was prepared by hydrothermal method; then, silver-Y zeolite was prepared from sodium-Y zeolite using ion exchange procedure; and finally, manganese dioxide nanoparticles were synthesized by in situ impregnation method by pouring the pre-prepared silver-Y zeolite into manganese(II) nitrate solution and loaded as 20 wt% onto silver-Y zeolite structure. The formation of the synthesized units and final nanocomposite catalyst was verified through scanning electron microscopy, X-ray diffraction, atomic absorption spectrometry and Fourier transform-infrared spectroscopy techniques. Gas chromatography chromatograms showed that O,S-diethyl methyl phosphonothiolate was decontaminated perfectly by the catalyst in n-heptane solvent after 8 h, at room temperature, while chloroform and isopropanol solvents and other reaction times gave lower decontamination results. Moreover, gas chromatography-mass spectrometry chromatograms confirmed the formation of ethyl methyl phosphonic acid as a major and final product, which exemplifies the role of hydrolysis reaction during the degradation progress.

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Effects of calcium ions on surface characteristics and adsorptive properties of hydrous manganese dioxide

Cited by 75 publications

References 13 publications

Cesium and cobalt adsorption on synthetic nano manganese oxide: A two dimensional infra-red correlation spectroscopic investigation

Cesium and cobalt adsorption on synthetic nano manganese oxide: A two dimensional infra-red correlation spectroscopic investigation

Amorphous Manganese-Calcium Oxides as a Possible Evolutionary Origin for the CaMn4 Cluster in Photosystem II

Manganese dioxide nanoparticles-silver-Y zeolite as a nanocomposite catalyst for the decontamination reactions of O, S-diethyl methyl phosphonothiolate

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