Hydrothermal preparation of tobermorite from blast furnace slag for Cs+ and Sr2+ sorption

Tsutsumi, Takuma; Nishimoto, Shinji; Kameshima, Yoshikazu; Miyake, Michihiro

doi:10.1016/j.jhazmat.2013.12.024

Cited by 69 publications

(40 citation statements)

References 37 publications

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“…The present findings indicate that C-S-H(I) exhibited a comparatively higher cation exchange capacity compared with tobermorites as described in previous reports [40][41][42]. The total calcium content of C-S-H(I) in the MCSM was 6.09 mmol g À1 , while the exchangeable Ca was as high as 3.38 mmol g À1 (55.6%) at 35°C in the case of an MCSM dosage of 5 g L À1 .…”

Section: Sorption Mechanismsupporting

confidence: 85%

Preparation and evaluation of a mesoporous calcium-silicate material (MCSM) from coal fly ash for removal of Co(II) from wastewater

Lei

et al. 2015

Chemical Engineering Journal

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Section: Sorption Mechanismsupporting

confidence: 85%

Preparation and evaluation of a mesoporous calcium-silicate material (MCSM) from coal fly ash for removal of Co(II) from wastewater

Lei

et al. 2015

Chemical Engineering Journal

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“…Tobermorite [Ca 5 (OH) 2 Si 6 O 16 ·4H 2 O] is a type of crystalline C–S–H mineral synthesized in a hydrothermal environment . Recently, many studies have been carried out on tobermorite and Al‐substituted tobermorite, due to their good performance in applications such as thermal insulation and cation exchange . In our previous studies, we synthesized Al‐substituted tobermorite from alumina‐extracted fly ash in a dilute NaOH solution by a hydrothermal process.…”

Section: Introductionmentioning

confidence: 99%

“…30,31 Recently, many studies have been carried out on tobermorite and Al-substituted tobermorite, due to their good performance in applications such as thermal insulation and cation exchange. [32][33][34][35] In our previous studies, 35,36 we synthesized Al-substituted tobermorite from aluminaextracted fly ash in a dilute NaOH solution by a hydrothermal process. However, the incorporation mechanism of Al and Na in the samples was not investigated.…”

Section: Introductionmentioning

confidence: 99%

Incorporation of Al and Na in Hydrothermally Synthesized Tobermorite

Wang

Zheng

et al. 2016

J Am Ceram Soc.

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Calcium silicate hydrate and its Al‐substituted form synthesized by a hydrothermal process were investigated by X‐ray diffraction, compositional analysis, and magic‐angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy, in order to determine the mechanism of Al and Na incorporation in the tobermorite structure with varying molar ratios of Ca/Si and Al/Si. At a high molar ratio of Ca/Si, the silicate chains of tobermorite are ruptured, the degree of polymerization of the silicate chains is lowered, and the high calcium concentration lowers the content of Na2O in the structure. Solid‐state 29Si and 27Al MAS NMR spectroscopy confirm that all Al atoms were incorporated in the silicate chains of tobermorite. The tetrahedrally coordinated Al (Al(IV)) could either act as the bridging tetrahedron (QB2) for the dreierketten chain of tobermorite, or be present in Q3 sites that link two dreierketten chains together. Therefore, the degree of polymerization of the silicate chains of tobermorite is increased at high molar ratio of Al/Si. Furthermore, the greater charge deficit due to the replacement of Si4+ by Al3+ ions is compensated by increased adsorption or binding of Na+.

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“…Coleman et al [7,8,11] reported that Al-substituted 11 Å tobermorite exhibited cation exchange properties and was effective in the removal of Cd 2+ , Pb 2+ , and Zn 2+ from acidified aqueous wastes. An 11 Å tobermorite substituted with Na + and Al 3+ allows ion exchange with alkalis (Cs + , Rb + , and K + ) and alkaline earth elements (Ba 2+ , Sr 2+ , and Mg 2+ ) [12,13]. To the best of our knowledge, few studies have been conducted to study the adsorption of Cr(VI) by tobermorite or Al-substituted tobermorite.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization and Hexavalent Chromium Adsorption Characteristics of Aluminum- and Sucrose-Incorporated Tobermorite

Zhao

Wei

et al. 2017

Materials

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Tobermorites were synthesized from the lime-quartz slurries with incorporations of aluminum and sucrose under hydrothermal conditions, and then used for adsorption of Cr(VI). The chemical components, and structural and morphological properties of tobermorite were characterized by X-ray diffraction (XRD), thermogravimetric-differential scanning calorimetry (TG-DSC), Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR), scanning electron microscopy (SEM), X-ray photoelectron spectroscopic (XPS) and N2 adsorption–desorption measurements. The formation and crystallinity of tobermorite could be largely enhanced by adding 2.3 wt.% aluminum hydroxide or 13.3 wt.% sucrose. Sucrose also played a significantly positive role in increasing the surface area. The adsorption performances for Cr(VI) were tested using a batch method taking into account the effects of pH, the adsorption kinetics, and the adsorption isotherms. The adsorption capacities of the aluminum- and sucrose-incorporated tobermorites reached up to 31.65 mg/g and 28.92 mg/g, respectively. Thus, the synthesized tobermorites showed good adsorption properties for removal of Cr(VI), making this material a promising candidate for efficient bulk wastewater treatment.

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Hydrothermal preparation of tobermorite from blast furnace slag for Cs+ and Sr2+ sorption

Cited by 69 publications

References 37 publications

Preparation and evaluation of a mesoporous calcium-silicate material (MCSM) from coal fly ash for removal of Co(II) from wastewater

Preparation and evaluation of a mesoporous calcium-silicate material (MCSM) from coal fly ash for removal of Co(II) from wastewater

Incorporation of Al and Na in Hydrothermally Synthesized Tobermorite

Synthesis, Characterization and Hexavalent Chromium Adsorption Characteristics of Aluminum- and Sucrose-Incorporated Tobermorite

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