Correlation between the formation of silica skeleton structure and Fourier transform reflection infrared absorption spectroscopy spectra

Muroya, Masa-aki

doi:10.1016/s0927-7757(99)00054-0

Cited by 59 publications

(29 citation statements)

References 19 publications

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“…In addition, a sharp vibrational band at 712 cm −1 has been shown to be characteristic to solid nitrate (Toops et al, 2005). The O-Si-O asymmetrical stretch of the silicate ion (SiO 4− 4 ) at 1033 cm −1 is clearly visible in all spectra and confirms what has been stated in the literature (Cunningham et al, 1974;Allen et al, 1994;Martinez et al, 1998;Muroya, 1999). Blanco and McIntyre (1972) identified quartz (SiO 2 ) and kaolinite to be the major species in coarse atmospheric aerosol samples.…”

Section: Pm10-25 Coarse Particlessupporting

confidence: 83%

Mass concentration and ion composition of coarse and fine particles in an urban area in Beirut: effect of calcium carbonate on the absorption of nitric and sulfuric acids and the depletion of chloride

Kouyoumdjian

Saliba

2006

Atmos. Chem. Phys.

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Abstract. Levels of coarse (PM10-2.5) and fine (PM2.5) particles were determined between February 2004 and January 2005 in the city of Beirut, Lebanon. While low PM mass concentrations were measured in the rainy season, elevated levels were detected during sand storms originating from Arabian desert and/or Africa. Using ATR-FTIR and IC, it was shown that nitrate, sulfate, carbonate and chloride were the main anionic constituents of the coarse particles, whereas sulfate was mostly predominant in the fine particles in the form of (NH 4 ) 2 SO 4 . Ammonium nitrate was not expected to be important because the medium was defined as ammonium poor. In parallel, the cations Ca 2+ and Na + dominated in the coarse, and NH + 4 , Ca 2+ and Na + in the fine particles. Coarse nitrate and sulfate ions resulted from the respective reactions of nitric and sulfuric acid with a relatively high amount of calcium carbonate. Both CaCO 3 and Ca(NO 3 ) 2 crystals identified by ATR-FTIR in the coarse particles were found to be resistant to soaking in water for 24 h but became water soluble when they were formed in the fine particles suggesting, thereby, different growth and adsorption phenomena. The seasonal variational study showed that nitrate and sulfate ion concentrations increased in the summer due to the enhancement of photochemical reactions which facilitated the conversion of NO 2 and SO 2 gases into NO − 3 and SO 2− 4 , respectively. While nitrate was mainly due to local heavy traffic, sulfates were due to local and long-range transport phenomena. Using the air mass trajectory HYS-PLIT model, it was found that the increase in the sulfate concentration correlated with wind vectors coming from Eastern and Central Europe. Chloride levels, on the other hand, were high when wind originated from the sea and low during sand storms. In addition to sea salt, elevated levels of chloride were also attributed to waste mass burning in proximity to the site. In comparison to other neighboring MediterCorrespondence to: N. Saliba (ns30@aub.edu.lb) ranean countries, relatively higher concentrations of calcium in Beirut were good indication of calcitic crustal abundance. Considering the importance of the health and climate impacts of aerosols locally and regionally, this study constitutes a point of reference for eastern Mediterranean transport modeling studies and local regulatory and policy makers.

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Section: Pm10-25 Coarse Particlessupporting

confidence: 83%

Mass concentration and ion composition of coarse and fine particles in an urban area in Beirut: effect of calcium carbonate on the absorption of nitric and sulfuric acids and the depletion of chloride

Kouyoumdjian

Saliba

2006

Atmos. Chem. Phys.

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“…Although there are a number of studies on the assignments of vibration bands of silica solids, glasses and gels [31,32], the assignments related to the distribution of anionic species in sodium silicate solution, especially very dilute solutions, are still unclear and some even incompatible [16][17][18]. To obtain the distribution of silicate species with pH and concentration, a silicate speciation model was set up using WinSGW program [33].…”

Section: Spectra Of Aqueous Sodium Silicatementioning

confidence: 99%

A study of sodium silicate in aqueous solution and sorbed by synthetic magnetite using in situ ATR-FTIR spectroscopy

Yang

Roonasi

Holmgren

2008

Journal of Colloid and Interface Science

166

105

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The sorption of sodium silicate by synthetic magnetite (Fe 3 O 4 ) at different pH conditions (pH 7-11) and initial silicate concentrations (1 × 10 −3 and 10 × 10 −3 mol L −1 ) was studied using in situ attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy. The analysis of infrared spectra of sodium silicate in solution as well as adsorbed on magnetite nano-particles clearly showed the evolution of different silicate species depending on pH and silica concentration. The silicate concentration studied (10 × 10 −3 mol L −1 ) contained polymeric or condensed silicate species at lower pH as well as monomers at high pH, as evident from infrared spectra. Condensation of monomers resulted in an increased intensity of absorptions in the high frequency part (>1050 cm −1 ) of the spectral region, which contains information about both silicate in solution and sorbed silicate viz. 1300 cm −1 -850 cm −1 . In the pH range studied, infrared spectra of sorbed silicate and sorbed silicate during desorption both indicated the presence of different types of surface complexes at the magnetite surface. The sorption mechanism proposed is in accordance with a ligand exchange reaction where both monodentate and bidentate complexes could exist at low surface loading level, the relative proportion of the complexes being due to both pH and concentration in solution. Oligomerization occurred on the magnetite surface at higher surface loading.

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“…The band of symmetric stretching (ν a ) of Si-O-Si shows the doublet at the wavenumbers of 797 and 779 cm À 1 . The bending O-Si-O deformation is located at 460 cm À 1 [57][58][59]. The bands at 562 and 465 cm À 1 are assigned to yttrium oxide.…”

Section: Synthesis Of Sry 2 (Sio 4 ) 3 O Phasementioning

confidence: 97%

“…4(a). The following literature [54][55][56][57][58][59][60] and the comparison with infrared spectra of pure phases identified by HT-XRD (Fig. 2) were used for the assignment of IR bands in the spectra.…”

Section: Synthesis Of Sry 2 (Sio 4 ) 3 O Phasementioning

confidence: 99%

Preparation, kinetics of sinter-crystallization and properties of hexagonal strontium-yttrate-silicate apatite phase: SrY4[SiO4]3O

Ptáček

Bartoníčková

Švec

et al. 2015

Ceramics International

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Correlation between the formation of silica skeleton structure and Fourier transform reflection infrared absorption spectroscopy spectra

Cited by 59 publications

References 19 publications

Mass concentration and ion composition of coarse and fine particles in an urban area in Beirut: effect of calcium carbonate on the absorption of nitric and sulfuric acids and the depletion of chloride

Mass concentration and ion composition of coarse and fine particles in an urban area in Beirut: effect of calcium carbonate on the absorption of nitric and sulfuric acids and the depletion of chloride

A study of sodium silicate in aqueous solution and sorbed by synthetic magnetite using in situ ATR-FTIR spectroscopy

Preparation, kinetics of sinter-crystallization and properties of hexagonal strontium-yttrate-silicate apatite phase: SrY4[SiO4]3O

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