Synthesis, characterization of mesoporous silica materials from waste coal fly ash for the classical Mannich reaction

Dhokte, Aashish O.; Khillare, Santosh L.; Lande, Machhindra K.; Arbad, Balasaheb R.

doi:10.1016/j.jiec.2011.05.033

Cited by 47 publications

(30 citation statements)

References 41 publications

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“…The used coal fly ash for the silica synthesis had various particle sizes (2.0-30 µm) and chemical compositions (31.6-60.1 wt.% Si, 10.2-40.8 wt.% Al, 0.8-8.4 wt.% Fe, 0.4-24.8 wt.% Ca) [35][36][37][38].…”

Section: Fly Ash As Raw Materials For Mesoporous Silica Synthesismentioning

confidence: 99%

Fly Ash, from Recycling to Potential Raw Material for Mesoporous Silica Synthesis

Miricioiu

Niculescu

2020

Nanomaterials

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In order to meet the increasing energy demand and to decrease the dependency on coal, environmentally friendly methods for fly ash utilization are required. In this respect, the priority is to identify the fly ash properties and to consider its potential as raw material in the obtaining of high-value materials. The physico-chemical and structural characteristics of the fly ash coming from various worldwide power plants are briefly presented. The fly ash was sampled from power plants where the combustion of lignite and hard coal in pulverized-fuel boilers (PC) and circulating fluidized bed (CFB) boilers was applied. The fly ash has high silica content. Due to this, the fly ash can be considered a potential raw material for the synthesis of nanoporous materials, such as zeolites or mesoporous silica. The samples with the highest content of SiO2 can be used to obtain mesoporous silica materials, such as MCM-41 or SBA-15. The resulting mesoporous silica can be used for removing/capture of CO2 from emissions or for wastewater treatment. The synthesis of various porous materials using wastes would allow a high level of recycling for a sustainable society with low environmental impact.

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Section: Fly Ash As Raw Materials For Mesoporous Silica Synthesismentioning

confidence: 99%

Fly Ash, from Recycling to Potential Raw Material for Mesoporous Silica Synthesis

Miricioiu

Niculescu

2020

Nanomaterials

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“…The mean sizes of the modified silica particles decreased when increasing seed concentration, and increased when increasing the concentration of magnesium ion. Additionally, some recent studies developed mesoporous silica, such as SBA or MCM series [21,22]. These studies proved could control the pores using anionic or cationic surfactants followed by an incineration process.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and surface characterization of silica nanoparticles from industrial resin waste controlled by optimal gelation conditions

Liou¹,

Lin²

2012

Journal of Industrial and Engineering Chemistry

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“…Mesoporous silica has been synthesized from a variety of silicate sources, including tetraethoxysilane (TEOS), sodium silicate, fumed silica, colloidal silica, and fly ash (e.g., [7][8][9][10][11]). One would expect the formation of mesoporous silica may not be sensitive to the silicate source.…”

Section: Introductionmentioning

confidence: 99%

Formation of Mesoporous Materials from Silica Dissolved in Various NaOH Concentrations: Effect of pH and Ionic Strength

Park¹,

Han

Kim

2012

Journal of Nanomaterials

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We describe the effects of NaOH/SiO2ratio and pH on the formation of mesoporous materials, which was synthesized via an alkali-metal hydroxide fusion method, from amorphous silica dissolved in NaOH. Physical properties (e.g., specific surface area, pore volume, and pore size) of mesoporous materials synthesized at different conditions (i.e., pH, NaOH/SiO2ratio) were evaluated through X-ray diffraction, nitrogen adsorption-desorption, and transmission electron microscope analyses. The results showed that, at the NaOH/SiO2ratios of 0.5, 1, and 2, gels were successfully synthesized while no product was formed at the NaOH/SiO2ratios greater than 2. Additionally, mesoporous materials were found to be formed at both pH 10 and 11 while they were unstable under more alkaline conditions. The adsorption/desorption isotherm results for the mesoporous materials synthesized at around pH 11 and with NaOH/SiO2ratios of 0.5–0.8 showed a hysteresis loop characteristic of the bottle-neck pore shape. Furthermore, mesoporous materials with good physical properties were synthesized from all gels at pH 10 regardless of sodium concentration.

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Synthesis, characterization of mesoporous silica materials from waste coal fly ash for the classical Mannich reaction

Cited by 47 publications

References 41 publications

Fly Ash, from Recycling to Potential Raw Material for Mesoporous Silica Synthesis

Fly Ash, from Recycling to Potential Raw Material for Mesoporous Silica Synthesis

Synthesis and surface characterization of silica nanoparticles from industrial resin waste controlled by optimal gelation conditions

Formation of Mesoporous Materials from Silica Dissolved in Various NaOH Concentrations: Effect of pH and Ionic Strength

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