Feasible synthesis of coal fly ash based porous composites with multiscale pore structure and its application in Congo red adsorption

Sun, Guangai; Zhang, Jiayu; Hao, Bianlei; Li, Xiang; Yan, Mi; Liu, Kaiqi

doi:10.1016/j.chemosphere.2022.134136

Cited by 23 publications

(6 citation statements)

References 42 publications

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“…The thermal conductivity of the M95Q5F0 and M90Q0F0 AMCs was found to be 63.72 and 92.74 W/mK, respectively, at 250 • C. On the other hand, the M95Q0F5 and M90Q0F10 AMCs possessed a thermal conductivity of 49.81 and 78.20 W/mK, respectively, at 250 • C. The thermal conductivity at 250 • C of the 5 wt.% fly ash-reinforced M95Q0F5 AMC was approximately 21.82% lower than the thermal conductivity of the 5 wt.% quartz-reinforced AMC at the same temperature. This could be due to structural properties of fly ash, which is a porous material [55,56]. Any entrapment of air and gas cannot be ruled out in such porous structures.…”

Section: Thermal Conductivity Of the Compositesmentioning

confidence: 99%

An Investigation of the Thermal Properties of LM13- Quartz- Fly-Ash Hybrid Composites

Murthy,

Ambekar,

Hiremath

2024

J. Compos. Sci.

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In the present work, a metal–matrix composite was casted using the LM13 aluminum alloy, which is most widely used for casting automotive components. Such applications require materials to withstand high operating temperatures and perform reliably without compromising their properties. In this regard, particulate-reinforced composites have gained widespread adaptability. The particulate reinforcements used comprise of one of the widely available industrial by-products. which is fly ash, along with the abundantly available quartz. Hybrid composites are fabricated through the economical liquid route that is widely used in mass production. Though there are numerous published research articles investigating the mechanical properties of metal–matrix composites, very few investigated the thermal properties of the composites. In the present work, thermal properties such as thermal conductivity and thermal diffusivity of cast hybrid composites were evaluated. The particulate reinforcements were added in varied weight percentages to the molten LM13 alloy and were dispersed uniformly using a power-driven stirrer. The melt with the dispersed particulate reinforcements was then poured into a thoroughly dried sand mold, and the melt was allowed to solidify. The quality of the castings was ascertained through density evaluation followed by a microstructural examination. It was found that the composites with only the fly ash particles as a reinforcement were less dense in comparison to the composites cast with the quartz particulate reinforcement. However, the hybrid composite, with both particulate reinforcements were dense. The microstructure revealed a refined grain structure. The thermal diffusivity and thermal conductivity values were lower for the composites cast with only the fly ash reinforcement. On the other hand, the composites cast with only quartz as the particulate reinforcement exhibited higher thermal diffusivity and thermal conductivity. The specific heat capacity was found to be lower for the fly ash-reinforced composites and higher for the quartz-reinforced composites in comparison to the LM13 base matrix alloy. However, the highest value of thermal diffusivity and thermal conductivity were reported for the hybrid composites with a 10 wt.% inclusion of both fly ash and quartz particulate reinforcements.

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Section: Thermal Conductivity Of the Compositesmentioning

confidence: 99%

An Investigation of the Thermal Properties of LM13- Quartz- Fly-Ash Hybrid Composites

Murthy,

Ambekar,

Hiremath

2024

J. Compos. Sci.

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“…The pore-forming agent Na 2 CO 3 decomposes into mesoporous and macroporous structures with increasing temperature, which benefits the adsorption of Pb 2+ by CGPC [34]. At temperatures above 800 • C, a high-temperature transformation of kaolinite to mullite occurs in coal gangue, making the CGPC denser and increasing its strength [35,36]. However, excessive densification negatively affects the adsorption of Pb 2+ , resulting in a decrease in adsorption capacity.…”

Section: Effect Of Flux On the Performance Of Cgpcmentioning

confidence: 99%

Preparation of Coal Gangue-Based Porous Ceramics and Its Application on Pb2+ Cycling Adsorption

et al. 2023

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The presence of lead in wastewater poses a significant threat to human health. To address this issue, coal gangue-based porous ceramics (CGPC) were developed to remove Pb2+ in wastewater. Coal gangue (CG) waste from Lvliang City, Shanxi province in China was used as raw material, and porosity was introduced through the addition of a pore-forming agent and an extrusion molding process. Properties of CGPC were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) surface area analysis, Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA) to explore its adsorption mechanism. The researchers examined the impact of pH, dosage of adsorbent, initial concentration, duration of adsorption, and temperature on the adsorption efficiency of CGPC. The CGPC of best performance had a porosity of 32.91% and compressive strength of 20.5 MPa prepared at 800 °C under nitrogen atmosphere with 10 wt% Na2CO3 pore-forming agent and 8 wt% CaO-MnO2 combined fluxing agent. The removal rate of Pb2+ in simulated lead-containing wastewater with a concentration of 200 mg/L reached 99.63%, and the maximum adsorption capacity was 32.15 mg/g. The adsorption process of Pb2+ by CGPC involves chemical adsorption and ion exchange. After being regenerated for seven cycles with 1 mol/L NaOH as the desorption agent, the removal rate of Pb2+ by CGPC still had 72%.

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“…In addition, prolonged exposure to MB may provoke many diseases, such as eye and skin irritation, digestive infections, and mental confusion, for both aquatic animals and humans [ 4 ]. The key issue in treating contaminated water is the development of high-performance adsorbents, since the adsorption technology is characterized by high efficiency, simple operation, and environmental friendliness, as compared with other wastewater treatment techniques (such as chemical precipitation, membrane filtration, degradation, and so on) [ 5 ]. Ordered mesoporous silica materials with uniform and adjustable channels, high specific surface areas and pore volumes, and large and tunable pore sizes provide important impetuses for the development of high-performance adsorbents [ 6 ] and are widely used for the efficient removal of heavy metals and toxic organic dyes [ 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Coal-Fly-Ash-Based Ordered Mesoporous Materials and Their Adsorption Application

et al. 2023

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A feasible approach was developed for the synthesis of ordered mesoporous SBA-15-type materials using coal fly ash (CFA) as raw material. In the proposed approach, CFA was, firstly, activated by subcritical water with the addition of NaOH, which allowed an efficient extraction of silicon species from CFA under strong acidic conditions at near room temperature. Subsequently, in the synthesis system, using silicon extraction solution as the silicon precursor, the introduction of anhydrous ethanol as a co-solvent effectively inhibited the polymerization of silanol species and promoted their collaborative self-assembly with surfactant molecules by enhancing the hydrogen bond interactions. The resultant SBA-15 material had a high purity, high specific surface area (1014 m2/g) and pore volume (1.08 cm3/g), and a highly ordered mesostructure, and, therefore, exhibited an excellent removal efficiency (90.5%) and adsorption capacity (160.8 mg/g) for methylene blue (MB) from simulated wastewater. Additionally, the generation of surface acid sites from the homogenous incorporation of Al atoms onto the mesoporous walls of SBA-15 combined with the perfect retention of the ordered mesostructure endowed the obtained Al-SBA-15 material with a further boost in the removal performance of MB. The MB removal efficiency can reach ~100%, along with a maximum adsorption capacity of 190.1 mg/g.

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Feasible synthesis of coal fly ash based porous composites with multiscale pore structure and its application in Congo red adsorption

Cited by 23 publications

References 42 publications

An Investigation of the Thermal Properties of LM13- Quartz- Fly-Ash Hybrid Composites

An Investigation of the Thermal Properties of LM13- Quartz- Fly-Ash Hybrid Composites

Preparation of Coal Gangue-Based Porous Ceramics and Its Application on Pb2+ Cycling Adsorption

Synthesis of Coal-Fly-Ash-Based Ordered Mesoporous Materials and Their Adsorption Application

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