A comparative study on fly ash, geopolymer and faujasite block for Pb removal from aqueous solution

Liu, Yi; Yan, Chunjie; Zhang, Zuhua; Wang, Hongquan; Zhou, Sen; Zhou, Wei

doi:10.1016/j.fuel.2016.07.116

Cited by 165 publications

(79 citation statements)

References 60 publications

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“…For the CGCS, the typical band near 1616 and 3444 cm −1 is assigned to the vibration of the hydroxyl groups of absorbed water [28]. In the spectrum of the SiO 2 /Al 2 O 3 molar ratios of 5.20 and 3.40, the bands around 1644 and 3448 cm −1 are caused by the solid phase hydrate in the hydroxyl group or the zeolite channel [22,29]. In the raw material CGCS and NaP zeolite, the bands around 1040 and 994 cm −1 are different.…”

Section: Sem Results Analysismentioning

confidence: 99%

“…The silicon-aluminum ratio leads to the continuous generation of crystal nuclei in the gel layer, and a complex and ordered grid-like channel structure appears, which is conducive to the diffusion of the molecules in the inner layer and accelerates the silicate condensation and crystallization. With the extension of time, crystal particles such as Na + accumulated on the surface of CGCS finally formed a stable NaP zeolite structure [22,23].…”

Section: Influence Of Crystallization Timementioning

confidence: 99%

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Green Synthesis Method and Application of NaP Zeolite Prepared by Coal Gasification Coarse Slag from Ningdong, China

Zhang

Zhao

et al. 2020

Applied Sciences

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In view of the current and urgent environmental protection needs, the use of industrial solid waste in China’s Ningdong is becoming more and more important. In this paper, NaP zeolite with good physical properties is synthesized by using coal gasification coarse slag (CGCS) as the raw material, without the addition of a silicon and aluminum source, without the addition of a template agent, and without high-temperature calcination. Add a small amount of NaOH and deionized water to the CGCS to adjust the molar ratio to SiO2:Al2O3:Na2O:H2O = 5.2:1.0:5.0:100. The effects of aging time, crystallization temperature, and crystallization time parameters on synthetic zeolite were studied. The raw materials and the obtained zeolite were tested by XRF, XRD, SEM, FT-IR, TG-DSC, BET, and other technologies. The results show that the specific surface area of the synthesized NaP zeolite can reach 161.06 m2/g, which has the characteristics of large specific surface area, regular morphology, and high crystallinity. We obtained NaP zeolite through a simple and low-cost synthesis method. The synthesized NaP zeolite was used to simulate the removal of ammonia nitrogen in wastewater, and the optimal removal rate was 92.67%. Among them, Na+ plays an important role in the synthesis of NaP zeolite and ion exchange with NH4+. Our research provides new ideas for solving the large-scale accumulation of CGCS and treating ammonia nitrogen in industrial wastewater. Thus, it is a promising green environmental protection and “treating waste by waste” route.

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Section: Sem Results Analysismentioning

confidence: 99%

Section: Influence Of Crystallization Timementioning

confidence: 99%

Green Synthesis Method and Application of NaP Zeolite Prepared by Coal Gasification Coarse Slag from Ningdong, China

Zhang

Zhao

et al. 2020

Applied Sciences

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“…In raw fly ash, the broad peak at 3412 cm -1 and 1622 cm -1 were ascribed to the stretching and deformation vibrations of OH and H-O-H groups from the water molecules. While for Gr3, the broad bands are strong and these bands belong to the weakly bound water molecules which were adsorbed on the surface or trapped in the large cavities between the rings of geopolymer [2,19]. In the raw fly ash the strong peak at 1383 cm -1 was due to CO deformation vibration, and for Gr3 the weak peak at 1425 cm -1 was attributed to CO bending vibration.…”

Section: Characterizationmentioning

confidence: 97%

Preparation of alkali-activated fly ash-based geopolymer and their application in the adsorption of copper (II) and zinc (II) ions

et al. 2019

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Alkali activation of fly ash can a promising alternative of the system to improve adsorption capability of fly ash. In finding the best chemical composition of the activator solution, geopolymer has been synthesized using molar ratios of Na2O/SiO2 0.16, 0.3, and 0.5 (Gr1, Gr3, Gr5). The results indicated that the geopolymer synthesized with a ratio molar of Na2O/SiO2 0.3 (Gr3) improved the adsorption properties of fly ash substantially. Gr3 was characterized by BET, XRD, and FTIR. The batch experiment was conducted at the different duration and initial concentrations. The equilibrium sorption data were fitted for the Langmuir and Freundlich equations. The maximum sorption capacities calculated from Langmuir isotherm was 54 mg g-1 and 47 mg g-1 for Cu (II) and Zn (II) respectively. The kinetic data reveal that the pseudo-second order model was appropriate for a description of the kinetic performance.

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“…The negative value of DG 0 conrms the spontaneous nature of the process. 46,52,53 However, the positive value of DG 0 implies that the adsorption process is not spontaneous, thus requiring the mechanical agitation. 54…”

Section: Thermodynamic Analysismentioning

confidence: 99%

Insights into the competitive adsorption of pollutants on a mesoporous alumina–silica nano-sorbent synthesized from coal fly ash and a waste aluminium foil

et al. 2020

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A comparative study on fly ash, geopolymer and faujasite block for Pb removal from aqueous solution

Cited by 165 publications

References 60 publications

Green Synthesis Method and Application of NaP Zeolite Prepared by Coal Gasification Coarse Slag from Ningdong, China

Green Synthesis Method and Application of NaP Zeolite Prepared by Coal Gasification Coarse Slag from Ningdong, China

Preparation of alkali-activated fly ash-based geopolymer and their application in the adsorption of copper (II) and zinc (II) ions

Insights into the competitive adsorption of pollutants on a mesoporous alumina–silica nano-sorbent synthesized from coal fly ash and a waste aluminium foil

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