Hydrothermal synthesis of analcime without template

Bortolini, Heloisa R.; Lima, Dirléia S.; Perez‐Lopez, Oscar W.

doi:10.1016/j.jcrysgro.2019.125424

Cited by 14 publications

(6 citation statements)

References 32 publications

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“…The XRD patterns of the GFW showed several peaks located in the 2θ of 20.8 202), (312), (400), (332), ( 422), ( 501), ( 512), ( 404), (611), and (604) planes of analcime zeolite-like material (JCPDS . It is noteworthy that the fabrication of analcime zeolite from glass fiber waste without template was observed, which agrees well with those reported studies by Liu et al [35,36]. This is mainly because the glass fibers were extremely fast quenched (cooling rate > 105 K/s), and their network structure possesses much higher potential energy [37].…”

Section: Surface Characterization Of Mesoporous Zeolite-like Nanomaterialssupporting

confidence: 90%

Transformation of Glass Fiber Waste into Mesoporous Zeolite-Like Nanomaterials with Efficient Adsorption of Methylene Blue

Tsai

Horng

2021

Sustainability

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Recycling and reusing glass fiber waste (GFW) has become an environmental concern, as the means of disposal are becoming limited as GFW production increases. Therefore, this study developed a novel, cost-effective method to turn GFW into a mesoporous zeolite-like nanomaterial (MZN) that could serve as an environmentally benign adsorbent and efficient remover of methylene blue (MB) from solutions. Using the Taguchi optimizing approach to hydrothermal alkaline activation, we produced analcime with interconnected nanopores of about 11.7 nm. This MZN had a surface area of 166 m2 g−1 and was negatively charged with functional groups that could adsorb MB ranging from pH 2 to 10 and all with excellent capacity at pH 6.0 of the maximum Langmuir adsorption capacity of 132 mg g−1. Moreover, the MZN adsorbed MB exothermically, and the reaction is reversible according to its thermodynamic parameters. In sum, this study indicated that MZN recycled from glass fiber waste is a novel, environmentally friendly means to adsorb cation methylene blue (MB), thus opening a gateway to the design and fabrication of ceramic-zeolite and tourmaline-ceramic balls and ceramic ring-filter media products. In addition, it has environmental applications such as removing cation dyes and trace metal ions from aqueous solutions and recycling water.

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Section: Surface Characterization Of Mesoporous Zeolite-like Nanomaterialssupporting

confidence: 90%

Transformation of Glass Fiber Waste into Mesoporous Zeolite-Like Nanomaterials with Efficient Adsorption of Methylene Blue

Tsai

Horng

2021

Sustainability

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“…The analcime zeolite of PLMCT 3 and SLMCT 2 was characterized by a close-pack structure with a small pore diameter that makes the diffusion of molecules (e.g., nitrogen) difficult, developing lower area than sodalite zeolite found in LMC [ 39 ]. The surface area values reported for composite monoliths (SLMCT 2 ) and pellets (PLMCT 3 ) are comparable to those reported for a synthesized analcime with high crystallinity and low porosity [ 37 ].…”

Section: Resultssupporting

confidence: 69%

“…The diffractogram spectra of the muscovite/analcime composites PMLCT 3 and SLMCT 2 differed in their intensity and crystallinity. The starting materials, the preparation of the composites, the Fe 3+ /Mn 2+ incorporation into the structure and the temperature determined the crystalline symmetry of the obtained materials [ 37 , 38 ].…”

Section: Resultsmentioning

confidence: 99%

Fe3+/Mn2+ (Oxy)Hydroxide Nanoparticles Loaded onto Muscovite/Zeolite Composites (Powder, Pellets and Monoliths): Phosphate Carriers from Urban Wastewater to Soil

et al. 2022

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The development of an efficient adsorbent is required in tertiary wastewater treatment stages to reduce the phosphate–phosphorous content within regulatory levels (1 mg L−1 total phosphorous). In this study, a natural muscovite was used for the preparation of muscovite/zeolite composites and the incorporation of Fe3+/Mn2+ (oxy)hydroxide nanoparticles for the recovery of phosphate from synthetic wastewater. The raw muscovite MC and the obtained muscovite/sodalite composite LMC were used in the powder form for the phosphate adsorption in batch mode. A muscovite/analcime composite was obtained in the pellets PLMCT3 and monolith SLMCT2 forms for the evaluation in fixed-bed mode for continuous operation. The effect of pH, equilibrium and kinetic parameters on phosphate adsorption and its further reuse in sorption–desorption cycles were determined. The characterization of the adsorbents determined the Fe3+ and Mn2+ incorporation into the muscovite/zeolite composite’s structure followed the occupancy of the extra-framework octahedral and in the framework tetrahedral sites, precipitation and inner sphere complexation. The adsorbents used in this study (MC, LMC, PLMCT3 and SLMCT2) were effective for the phosphate recovery without pH adjustment requirements for real treated wastewater. Physical (e.g., electrostatic attraction) and chemical (complexation reactions) adsorption occurred between the protonated Fe3+/Mn2+ (oxy)hydroxy groups and phosphate anions. Higher ratios of adsorption capacities were obtained by powder materials (MC and LMC) than the pellets and monoliths forms (PLMCT3 and SLMCT2). The equilibrium adsorption of phosphate was reached within 30 min for powder forms (MC and LMC) and 150 min for pellets and monoliths forms (PLMCT3 and SLMCT2); because the phosphate adsorption was governed by the diffusion through the internal pores. The adsorbents used in this study can be applied for phosphate recovery from wastewater treatment plants in batch or fixed-bed mode with limited reusability. However, they have the edge of environmentally friendly final disposal being promissory materials for soil amendment applications.

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“…XRD patterns were obtained for fresh samples (calcined and reduced) and for spent samples (after the catalytic tests). The average crystallite sizes were estimated through the Scherrer's equation 35,36 …”

Section: Methodsmentioning

confidence: 99%

“…Scanning electron microscopy with energy dispersive spectroscopy (SEM‐EDS) analyses were performed in a Pro‐X Phenom microscope, using backscattered electrons at 10 kV and a 2500× magnification. Prior to the analyses, the samples were metallized with gold 35,40 …”

Section: Methodsmentioning

confidence: 99%

Effect of Ni/Cu ratio on activity and selectivity of CO₂ methanation over Ni‐Cu/SiO₂ catalysts

Dias

Perez‐Lopez

2021

Greenhouse Gases

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In the present work two series of Ni‐Cu/SiO2 catalysts were evaluated in CO2 methanation. Samples with fixed Ni/Cu ratio and variable total metal loadings, and samples with fixed Ni loadings and variable Ni/Cu ratio were prepared by wet impregnation and characterized by N2 physisorption, X‐ray diffractometry, H2 temperature programmed reduction , scanning electron microscopy with energy dispersive spectroscopy , and temperature programmed oxidation. The catalytic tests were carried out from 250 to 450 °C, H2/CO2 = 4 and 1 atm in a fixed bed tubular reactor with online analysis by gas chromatography. Higher Ni loadings lead to higher Ni° crystallite sizes for samples with fixed Ni/Cu ratio, whereas no difference was observed for samples with variable Ni/Cu ratio. In addition, higher Ni/Cu ratios shifted the reduction temperature to higher values, revealing an increase in metal‐support interaction. Catalysts with Ni/Cu = 10 ratio presented almost equal CO2 conversion regardless of the Ni content, which is attributed to the increase in the Ni° crystallite size as the Ni content increases, whereas the selectivity for CH4 increased with the Ni content due to Ni migration to the surface. For catalysts with fixed Ni content, the higher the Ni/Cu ratio, the greater the CO2 conversion and the CH4 selectivity, demonstrating that the proper adjustment of the Ni/Cu ratio is essential for a high CH4 yield. The catalyst with the highest Ni/Cu ratio achieved a CO2 conversion of 63.3% and CH4 selectivity of 95.7% at 400 °C, showing the greatest resistance to sintering during 5 hr and low carbon formation, which can be attributed to the small crystallite size (∼15 nm) and high metal‐support interaction, resulting from an appropriate Ni/Cu ratio. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Hydrothermal synthesis of analcime without template

Cited by 14 publications

References 32 publications

Transformation of Glass Fiber Waste into Mesoporous Zeolite-Like Nanomaterials with Efficient Adsorption of Methylene Blue

Transformation of Glass Fiber Waste into Mesoporous Zeolite-Like Nanomaterials with Efficient Adsorption of Methylene Blue

Fe3+/Mn2+ (Oxy)Hydroxide Nanoparticles Loaded onto Muscovite/Zeolite Composites (Powder, Pellets and Monoliths): Phosphate Carriers from Urban Wastewater to Soil

Effect of Ni/Cu ratio on activity and selectivity of CO₂ methanation over Ni‐Cu/SiO₂ catalysts

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Hydrothermal synthesis of analcime without template

Cited by 14 publications

References 32 publications

Transformation of Glass Fiber Waste into Mesoporous Zeolite-Like Nanomaterials with Efficient Adsorption of Methylene Blue

Transformation of Glass Fiber Waste into Mesoporous Zeolite-Like Nanomaterials with Efficient Adsorption of Methylene Blue

Fe3+/Mn2+ (Oxy)Hydroxide Nanoparticles Loaded onto Muscovite/Zeolite Composites (Powder, Pellets and Monoliths): Phosphate Carriers from Urban Wastewater to Soil

Effect of Ni/Cu ratio on activity and selectivity of CO2 methanation over Ni‐Cu/SiO2 catalysts

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Effect of Ni/Cu ratio on activity and selectivity of CO₂ methanation over Ni‐Cu/SiO₂ catalysts