Study of adhesion properties and mechanism of sodium silicate binder reinforced with silicate fume

Song, Lai; Liu, Weihua; Xin, Fanghai; Li, Yingmin

doi:10.1016/j.ijadhadh.2021.102820

Cited by 29 publications

(10 citation statements)

References 15 publications

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“…Due to the existence of crystalline water, Na 2 SiO 3 ·9H 2 O is easily hydrolyzed to form sodium hydroxide and orthosilicic acid (H 4 SiO 4 ) with high adhesion. In the reaction process, the powdered Na 2 SiO 3 ·9H 2 O will gradually transform into colloidal H 4 SiO 4 adhering to the bottom of the reactor, affecting the mass transfer in the reaction process and reducing the yield of DMT 38 . In addition, the presence of crystalline water in sodium silicate will also cause its crystallinity to decrease (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…In the reaction process, the powdered Na 2 SiO 3 •9H 2 O will gradually transform into colloidal H 4 SiO 4 adhering to the bottom of the reactor, affecting the mass transfer in the reaction process and reducing the yield of DMT. 38 In addition, the presence of crystalline water in sodium silicate will also cause its crystallinity to decrease (Fig. 5), which may also be the reason for the better catalytic activity of calcined sodium silicate.…”

Section: Effect Of Variables In Pet Experimentsmentioning

confidence: 99%

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Calcined sodium silicate as solid base catalyst for alcoholysis of poly(ethylene terephthalate)

Tang

Liu

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND Chemical recycling of waste poly(ethylene terephthalate) (PET) is an effective way to save energy and protect the environment. In this work, calcined sodium silicate was adopted as a novel solid base catalyst for methanolysis of PET for the first time. The effects of various parameters on the conversion of PET and the yield of dimethyl terephthalate (DMT) in the methanolysis process of PET were investigated. RESULTS The results showed that the conversion of PET could reach about 100% and the yield of DMT could reach about 95% under the following conditions: calcined sodium silicate, 5 wt%; molar ratio of methanol to PET, 5:1; reaction time, 30 min; reaction temperature, 200 °C. The higher the mass ratio of methanol to PET and the higher the temperature, the higher were the conversion of PET and the yield of DMT. In addition, the catalyst can be reused more than five times and has good catalytic activity. CONCLUSIONS Calcined sodium silicate has the advantages of low cost, simple fabrication method, high catalytic activity and environmental friendliness. The use of this solid base catalyst is a promising strategy for realizing the recycling of waste polyester. © 2022 Society of Chemical Industry (SCI).

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Section: Resultsmentioning

confidence: 99%

Section: Effect Of Variables In Pet Experimentsmentioning

confidence: 99%

Calcined sodium silicate as solid base catalyst for alcoholysis of poly(ethylene terephthalate)

Tang

Liu

et al. 2022

J of Chemical Tech & Biotech

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“…The density functional theory (DFT) calculations were carried out using a Castep module of Material Studio 2020. − The interactions between the valence electrons and the ionic core , were described using the generalized gradient approximation (GGA) method with a Perdew–Burke–Ernzerhof (PBE) function . The dispersion-corrected DFT , was adopted with the energy cutoff for the plane-wave basis set at 450 eV.…”

Section: Methodsmentioning

confidence: 99%

Heterogenous Iron Oxide Assemblages for Use in Catalytic Ozonation: Reactivity, Kinetics, and Reaction Mechanism

Kong

Garg

Mortazavi

et al. 2023

Environ. Sci. Technol.

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Heterogeneous catalytic ozonation (HCO) has gained increasing attention as an effective process to remove refractory organic pollutants from industrial effluents. However, widespread application of HCO is still limited due to the typically low efficacy of catalysts used and matrix passivation effects. To this end, we prepared an Al 2 O 3 -supported Fe catalyst with high reactivity via a facile urea-based heterogeneous precipitation method. Due to the nonsintering nature of the preparation method, a heterogeneous catalytic layer comprised of γ-FeOOH and α-Fe 2 O 3 is formed on the Al 2 O 3 support (termed NS-Fe-Al 2 O 3 ). On treatment of a real industrial effluent by HCO, the presence of NS-Fe-Al 2 O 3 increased the removal of organics by ∼100% compared to that achieved with a control catalyst (i.e., α-Fe 2 O 3 /Al 2 O 3 or γ-FeOOH/Al 2 O 3 ) that was prepared by a conventional impregnation and calcination method. Furthermore, our results confirmed that the novel NS-Fe-Al 2 O 3 catalyst demonstrated resistance to the inhibitory effect of high concentration of chloride and sulfate ions usually present in industrial effluent. A mathematical kinetic model was developed that adequately describes the mechanism of HCO process in the presence of NS-Fe-Al 2 O 3 . Overall, the results presented here provide valuable guidance for the synthesis of effective and robust catalysts that will facilitate the wider industrial application of HCO.

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“…The density functional theory (DFT) calculations were performed in Material Studio 2020 with the Castep program. 36–38 Fe 12 SrO 19 (114) surfaces were modeled using a two-layer slab. The (2 × 4) unit cell was employed to prevent cross interactions amongst molecules at the surface.…”

Section: Methodsmentioning

confidence: 99%

A strontium ferrite modified separator for adsorption and catalytic conversion of polysulfides for excellent lithium–sulfur batteries

Qiu

et al. 2023

Dalton Trans.

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Study of adhesion properties and mechanism of sodium silicate binder reinforced with silicate fume

Cited by 29 publications

References 15 publications

Calcined sodium silicate as solid base catalyst for alcoholysis of poly(ethylene terephthalate)

Calcined sodium silicate as solid base catalyst for alcoholysis of poly(ethylene terephthalate)

Heterogenous Iron Oxide Assemblages for Use in Catalytic Ozonation: Reactivity, Kinetics, and Reaction Mechanism

A strontium ferrite modified separator for adsorption and catalytic conversion of polysulfides for excellent lithium–sulfur batteries

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