Synthesis of CaCO3–SiO2 composite using CO2 for fire retardant

Kong, Ha-Sung; Kim, Byoung-Ju; Kang, Kyung-Sik

doi:10.1016/j.matlet.2018.12.033

Cited by 6 publications

(5 citation statements)

References 14 publications

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“…To completely dissolve the Ca(OH) 2 hydrochloric acid was added until the turbid solution became transparent. The stock solution (15 ml) was charged to a round bottom flask with a stirring bar [19]. Ammonium hydroxide solution acting as a catalyst was slowly added to the round bottom flask with stirring.…”

Section: Preparation Of Caco 3 /Porous Carbon Core Shell Compositementioning

confidence: 99%

Synthesis and applications of CaCO3/HPC core–shell composite subject to heavy metals adsorption processes

Fathy

Zayed

Moustafa

2019

Heliyon

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Core-shell particles are a class of materials from nanostructures that have received increased attention recently due to their interesting properties and wide range of applications in catalysis, biology, chemistry of materials and sensors. Simple and cost-effective one-pot synthesis route to directly prepare CaCO 3 @highly porous carbon microsphere in a core–shell structure (denoted as CaCO 3 /HPC) had been developed as a high-performance heavy metals sorbent. XRD (X-Ray Diffraction), SEM (scanning electron microscopy), Raman, FTIR (Fourier Transform Infrared Spectroscopy) and BET tools were used in structure characterization of the products. The adsorption properties of the products obtained were studied. From this study the adsorption performances of CaCO 3 /HPCwere found to be optimal by comparing the maximum adsorption capacity of heavy metal ions (Pb (II) and Co(III)) with CaCO 3 /HPC.The adsorption of CaCO 3 /HPCtest to Pb(II) and Co(III), in particular Pb(II) had a good effect over a wide pH range (pH 2–7). The maximum adsorption capacitiesof CaCO 3 /HPC for Pb (II) and Co(III) were 677.6 mg/g, and 308.5 mg/g, respectively, at pH = 6 (lead ion was 5.5) and 25 °C, and the adsorption rate was fast. The lead ions can be adsorbed almost entirely in 5 minutes and only 0.2 g/L was the best effective doseof adsorbent. The prepared and carefully testednanocomposites had been found to be of excellent performances in adsorption and in analytical regeneration. The adsorption processof Pb(II) and Co(III) through core shell of the preparednanocomposite adsorbent was found to be a second-order chemical adsorption and fit for Langmuir and Freundlich isotherms, in the form of amonomolecular and multi-layer heavy metal adsorptionprocesses. The (CaCO 3 /HPC)-based sorbents (with and without) pelletization shows superior heavy metals adsorption performances compared to a CaCO 3 -based sorbent.

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Section: Preparation Of Caco 3 /Porous Carbon Core Shell Compositementioning

confidence: 99%

Synthesis and applications of CaCO3/HPC core–shell composite subject to heavy metals adsorption processes

Fathy

Zayed

Moustafa

2019

Heliyon

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“…The peaks observed at 2919.1 and 2851.2 cm –1 are assigned to the stretching vibration of C–H in RTV . The adsorption band centered at 1481.3 cm –1 is assigned to the characteristic absorption peak of CaCO 3 . The new peak located at 1101.2 cm –1 is attributed to the Si–O vibration of RTV chemically bound on the surface of CAC. , The crystal structures of CAC and SCAC samples were analyzed using the XRD technique, and the corresponding patterns are depicted in Figure b.…”

Section: Resultsmentioning

confidence: 99%

Superhydrophobic Calcium Aluminate Cement with Super Mechanical Stability

Wang

Lei

et al. 2019

Ind. Eng. Chem. Res.

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In the present study, a simple and cost-effective method for the preparation of a superhydrophobic calcium aluminate cement (SCAC) with superstable mechanical stability is reported. Room-temperature vulcanized silicone rubber (RTV) is used as an internal hydrophobic additive in concrete. The as-prepared cement surface and all cross-sections exhibit superhydrophobicity. The mechanical stability of the superhydrophobic-cement sample was evaluated by multiple severe mechanical damages. The SCAC sample exhibits super mechanical stability against sandpaper abrasion under high pressure, long-time impinging with sand, repeated knife scratches, and electric-cutter cutting. Amazingly, the cement sample was ground into powder, which was also superhydrophobic. In addition, the SCAC sample shows improved corrosion resistance for rebar against Cl– in comparison with the superhydrophilic-cement sample. Moreover, the application of superhydrophobic cement can be extended to oil–water separation using SCAC powder combined with an adhesive.

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“…The template that is based on the Stöber method can be divided into the soft template method and hard template method. For example, inorganic nanomaterials, such as ferric oxide, gold, and calcium carbonate, can be used as hard templates. Cetyltrimethylammonium bromide (CTAB) , or sodium dodecyl benzenesulfonate can be used as soft templates.…”

Section: Inorganic Nanomaterials Prepared By Sonochemical Methodsmentioning

confidence: 99%

Sonochemical Preparation of Inorganic Nanoparticles and Nanocomposites for Drug Release–A Review

Liu

Cavalli

et al. 2021

Ind. Eng. Chem. Res.

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Inorganic nanoparticles (NPs) and nanocomposites (NCs) generally possess versatile properties, that is, good specific surface area (SSA), magnetism, easy functionalization with ligands, etc.; thus, such nanomaterials have rapidly been appearing in drug release and diagnosis. This review presents the sonochemical synthesis of nano-SiO2, magnetic Fe3O4, graphene oxide, metal–organic frameworks, ZnO, Ca3(PO4)2, and ZrP2O7, and their NCs. The cavitation effects, such as extremely high temperature and pressure, radical reactions, high-speed microjets, shock waves, deagglomeration, and strong hydrodynamic shear-forces at collapsing cavities assist the preparation of inorganic NPs and NCs. As compared to conventional hydrothermal synthesis, the ultrasound (US)-assisted method can shorten preparation time and reduce particle size. Moreover, the prepared NPs are much more uniform in size distribution and form. Most US-assisted prepared NPs and NCs were proven to be appropriate as drug nanocarriers. Also, the drug release mechanisms are briefly presented and discussed. Furthermore, the effects of ultrasonic equipment, power, sonication time, substrate concentration, pH value, and surfactants on the characteristics and morphology of NPs and NCs are summarized.

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Synthesis of CaCO3–SiO2 composite using CO2 for fire retardant

Cited by 6 publications

References 14 publications

Synthesis and applications of CaCO3/HPC core–shell composite subject to heavy metals adsorption processes

Synthesis and applications of CaCO3/HPC core–shell composite subject to heavy metals adsorption processes

Superhydrophobic Calcium Aluminate Cement with Super Mechanical Stability

Sonochemical Preparation of Inorganic Nanoparticles and Nanocomposites for Drug Release–A Review

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