Comparative study on arsenate removal mechanism of MgO and MgO/TiO<sub>2</sub> composites: FTIR and XPS analysis

Wu, Pei-Yun; Jiang, Yin-Ping; Zhang, Qun-Ying; Jia, Yong; Peng, Daiyin; Xu, Wei

doi:10.1039/c5nj02358k

Cited by 78 publications

(46 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The egg‐like morphology of the CaO particles is destroyed and the particles seem to be clustered together. This observation is consistent with a previous study where loss of nanowire and necklace like morphology of MgO and MgO/TiO 2 respectively, was observed after chemisorption of arsenate ions . Thus, the change in morphology of CaO after phosmet adsorption further suggests chemical interaction between the CaO surface and phosmet.…”

Section: Resultssupporting

confidence: 93%

Adsorptive Degradation of Phosmet Using Hierarchically Porous Calcium Oxide : An Experimental and Theoretical Study

Nagpal

Kakkar

2020

ChemistrySelect

View full text Add to dashboard Cite

The potential of hierarchically porous calcium oxide (HrÀ CaO) as a destructive adsorbent for organophosphate pesticides has been explored in this work. HrÀ CaO has been synthesized via an environment friendly precipitation method using water/ glycerol as the solvent system and gelatin as a template. Asprepared CaO exhibits a hierarchically porous structure with a high surface area of 74.8 m 2 g À 1 . The adsorption of phosmet on HrÀ CaO obeys pseudo-second order kinetics and is described well by the Langmuir adsorption isotherm model. Thermodynamic studies further explain the adsorption process to be exothermic and spontaneous. Fourier transform infrared (FTIR), Scanning electron microscopy (SEM) and Xray diffraction (XRD) analysis of HrÀ CaO after phosmet adsorption and the fragmentation pattern of phosmet obtained through mass spectrometric studies suggest chemical interaction of phosmet with HrÀ CaO. Density functional theory (DFT) studies further confirm highly exothermic destructive phosmet adsorption and degradation products matching the peaks obtained in the mass spectrum.

show abstract

Section: Resultssupporting

confidence: 93%

Adsorptive Degradation of Phosmet Using Hierarchically Porous Calcium Oxide : An Experimental and Theoretical Study

Nagpal

Kakkar

2020

ChemistrySelect

View full text Add to dashboard Cite

show abstract

“…The lower ζ ‐potential values observed in magnesium oxide can be related to the unstable suspension colloidal of MgO particles, involving a large agglomeration of the particles. The IEP of the MgO particles was about pH ≈ 11.7, which was consistent with the reports . The positive ζ ‐signal of MgO is mainly located in the range of 4‐11 pH, suggesting that the surface of MgO particles is positive and the anion is adsorbed as shown in Figure .…”

Section: Resultssupporting

confidence: 90%

Sintering behavior of magnesium aluminate spinel MgAl₂O₄ synthesized by different methods

Mouyane

Jaber

Bendjemil

et al. 2019

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

This paper is focusing basically on the ceramic technology, of which several methods for the synthesis of MgAl2O4 have been investigated. The synthesis conditions regarding the powders cleanliness, microstructure, and sintering parameters of MgAl2O4 were studied. MgAl2O4 powder was synthesized via conventional solid‐state route using different milling process: vertical attrition milling, WAB as a high‐energy horizontal attrition milling, and Pulverisette as a planetary ball miller, and via solution combustion route using Urea, Glycine, and a mixture of Urea/Glycine. Urea and Glycine was used as fuel. The white powders were obtained for all solid‐state routes and for Urea‐combustion technique. The black and gray powders were obtained in the case of combustion technique, respectively, using a fuel of Glycine and Glycine/Urea mixture. The obtained powders and pellets were characterized by XRD, SEM, and Dilatometry. The results show that, among all the solid‐state route processes, wet attrition milling gives the better and clean spinel phase. The WAB milling and Pulverisette miller introduce a contamination by some yttria‐stabilized zirconia balls in the corresponding powder. Furthermore, the flash combustion technique permit to have nanoparticles with a dense spinel phase of MgAl2O4 and with lower sintering temperature in less time and with no calcination step.

show abstract

“…[ [34][35][36][37][38] The corresponding O 1s region (Fig. 2c) contains peaks at 529.3 eV from CoO, and at 531.1 eV from overlapping oxygen contributions of carbonate, OH, and CO. [25,32,34] When the sample was exposed to 10 -5 Torr of CO, only the C 1s and O 1s peaks from the carbonate increased (blue spectra (2) in Fig.…”

Section: B Co Adsorption and Reaction With Coo X Filmsmentioning

confidence: 99%

CO Oxidation Mechanisms on CoO_x-Pt Thin Films

et al. 2020

View full text Add to dashboard Cite

The reaction of CO and O 2 with submonolayer and multilayer CoO x films on Pt(111), to produce CO 2 , was investigated at room temperature in the mTorr pressure regime. Using operan do ambient pressure X-ray photoelectron spectroscopy and high pressure scanning tunneling microscopy, as well as density functional theory calculations, we found that the presence of oxygen vacancies in partially oxidized CoO x films significantly enhances the activity of CO oxidation to form CO 2 upon exposure to mTorr pressures of CO at room temperature. In contrast, CoO films without O-vacancies are much less active for CO 2 formation at RT, and CO only adsorbed in the form of carbonate species stable up to 260° C. On submonolayer CoO x islands, the carbonates form preferentially at island edges, deactivating the edge sites for CO 2 formation, even while the reaction proceeds inside the islands. These results provide a detailed understanding of CO oxidation pathways on systems where noble metals such as Pt interact with reducible oxides. ASSOCIATED CONTENTSupporting Information. XPS peak fitting procedures, further temperature dependent XPS measurements, XPS of multilayer films in CO and CO + O 2 mixtures, irreducibility of carbonate films, further discussion of CoO x films, and additional DFT calculation details and results. This material is available free of charge via the internet at http://pubs.acs.org.

show abstract

Comparative study on arsenate removal mechanism of MgO and MgO/TiO₂ composites: FTIR and XPS analysis

Abstract: The arsenate removal mechanism using MgO and MgO/TiO2 adsorbents was revealed by Fourier transform infrared and X-ray photoelectron spectroscopy.

Cited by 78 publications

References 58 publications

Adsorptive Degradation of Phosmet Using Hierarchically Porous Calcium Oxide : An Experimental and Theoretical Study

Adsorptive Degradation of Phosmet Using Hierarchically Porous Calcium Oxide : An Experimental and Theoretical Study

Sintering behavior of magnesium aluminate spinel MgAl₂O₄ synthesized by different methods

CO Oxidation Mechanisms on CoO_x-Pt Thin Films

Contact Info

Product

Resources

About

Comparative study on arsenate removal mechanism of MgO and MgO/TiO2 composites: FTIR and XPS analysis

Abstract: The arsenate removal mechanism using MgO and MgO/TiO2 adsorbents was revealed by Fourier transform infrared and X-ray photoelectron spectroscopy.

Cited by 78 publications

References 58 publications

Adsorptive Degradation of Phosmet Using Hierarchically Porous Calcium Oxide : An Experimental and Theoretical Study

Adsorptive Degradation of Phosmet Using Hierarchically Porous Calcium Oxide : An Experimental and Theoretical Study

Sintering behavior of magnesium aluminate spinel MgAl2O4 synthesized by different methods

CO Oxidation Mechanisms on CoOx-Pt Thin Films

Contact Info

Product

Resources

About

Comparative study on arsenate removal mechanism of MgO and MgO/TiO₂ composites: FTIR and XPS analysis

Sintering behavior of magnesium aluminate spinel MgAl₂O₄ synthesized by different methods

CO Oxidation Mechanisms on CoO_x-Pt Thin Films