Amine-modified silica surface applied as adsorbent in the phenol adsorption assisted by ultrasound

Oliveira, Marília R.; Oliveira, Matheus Moura; Oliveira, Ronney J.; Dervanoski, Adriana; Franceschi, Elton; Egues, Silvia Maria; Conto, Juliana F. De

doi:10.1080/00986445.2019.1615467

Cited by 5 publications

(1 citation statement)

References 42 publications

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“…Adding DA to the synthesis mixture resulted in shifting the pH 0 to a higher value, and also this pH 0 increased by increasing the amount of DA added. A similar observation about the zero-point charge of the silica and the effect of introducing amine was reported in the literature [ 26 ]. The obtained pH 0 values imply that in aqueous solution with a pH less than pH 0 , but higher than pK b of the DA (around 4), the surface will be rich with ≡SiOH 2+ species, while at any pH lower than the pK b , the SNP-DA surface will bear a more positive charge as a result of the protonation of both OH and NH 2 groups.…”

Section: Resultssupporting

confidence: 84%

One-Pot Synthesis of Amine-Functionalized Nano-Silica via Sol-Gel Assisted by Reverse Micelle Microemulsion for Environmental Application

et al. 2022

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Amine modified nano-silica was prepared via a one-pot route and under very mild conditions in water in oil microemulsion with a non-ionic surfactant to study the effect of changing the amount of N-[3-(Trimethoxysilyl)propyl]ethylenediamine (DA) added to the synthesis mixture on the characteristics of the obtained nanocomposite such as morphology, crystallinity, surface charge, particle size, surface area, and accordingly the effect of all of these factors on the efficiency of the nanocomposite for the removal of heavy metal ions, namely zinc, from aqueous solutions. XRD, SEM, TGA, BET, DLS, FTIR, and pH0 analysis were performed for samples and the results showed a strong effect for the amount of DA added to the synthesis mixture on the characteristics of the obtained nanocomposites. It was found that increasing the amount of DA added to the synthesis mixture increased the pH0, hydrodynamic particle size obtained by dynamic light scattering analysis, and the particle size obtained by SEM. Sample prepared without the addition of DA (SNP) and the samples prepared with 1.5 mL of DA (SNP-1.5DA) showed a better adsorption performance compared to the samples prepared with 0.5 and 1.0 mL of DA (SNP-0.5DA and SNP-1.0DA, respectively). The main factor affecting the adsorption efficiency was found to be the available surface area for each nanocomposite, which was directly related to the degree of crystallinity as obtained by XRD analysis.

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Section: Resultssupporting

confidence: 84%

One-Pot Synthesis of Amine-Functionalized Nano-Silica via Sol-Gel Assisted by Reverse Micelle Microemulsion for Environmental Application

et al. 2022

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Rapid synthesis of MCM-41 and SBA-15 by microwave irradiation: promising adsorbents for CO2 adsorption

Oliveira

Cecilia

Conto

et al. 2022

J Sol-Gel Sci Technol

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It is known that the world scenario is one of constant search for sustainable technologies that can reduce the emission of carbon dioxide (CO2) in the atmosphere. This is because CO2 is seen as the main responsible for the increase in the generation of greenhouse gases, which leads to global warming and climate change. The development of efficient adsorbents for CO2 capture is a current challenge. MCM-41 and SBA-15 were synthesized in a microwave reactor and used as adsorbents in this work. Microwave irradiation presents itself as an easy synthesis strategy with less preparation time and energy requirement. The silica synthesis period was extremely reduced (1 h) at a temperature of 60 and 80 °C in the microwave reactor, obtaining silica with good textural and chemical properties. The CO2 adsorption isotherms were performed at 0, 25, and 40 °C at 1 bar. The MCM-41 and SBA-15 present favorable results for CO2 capture processes, showing that pure silica synthesized by microwave already obtains promising results, reaching a maximum adsorption capacity of 2.16 mmol g−1 (1 bar—0 °C) and a good fit for the Langmuir, DsL and Toth models. Furthermore, to increase CO2 adsorption, the mesoporous silica was also modified via impregnation with branched polyethylene diamine (PEI) or tetraethylenepentamine (TEPA). It is worth mentioning that microwave irradiation reduced the synthesis steps and improved the properties and adsorption capacity of the silica. This work opens new opportunities in the efficient preparation of materials that require optimizing the adsorbent synthesis process. Graphical Abstract

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Implementing comprehensive machine learning models of multispecies toxicity assessment to improve regulation of organic compounds

Liu

et al. 2023

Journal of Hazardous Materials

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Amine-modified silica surface applied as adsorbent in the phenol adsorption assisted by ultrasound

Cited by 5 publications

References 42 publications

One-Pot Synthesis of Amine-Functionalized Nano-Silica via Sol-Gel Assisted by Reverse Micelle Microemulsion for Environmental Application

One-Pot Synthesis of Amine-Functionalized Nano-Silica via Sol-Gel Assisted by Reverse Micelle Microemulsion for Environmental Application

Rapid synthesis of MCM-41 and SBA-15 by microwave irradiation: promising adsorbents for CO2 adsorption

Implementing comprehensive machine learning models of multispecies toxicity assessment to improve regulation of organic compounds

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