The Effects of NaOH Concentration on the Hydrothermal Synthesis of a Hydroxyapatite–Zeolite Composite Using Blast Furnace Slag

Ryu, Gum-Sung; Khalid, Hammad R.; Lee, Namkon; Wang, Zhen; Park, Solmoi

doi:10.3390/min11010021

Cited by 10 publications

(5 citation statements)

References 49 publications

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“…The XRF analysis demonstrates the composition of magnetite decreases from magnetized zeolite C to A, consistent with the XRD results, suggesting higher iron incorporation resulted from the particle size subdivision, as denoted in Table 7. The FTIR spectra of the modified zeolite and magnetized zeolite demonstrate the existence of hydroxyl (OH-), water (O-H-O), and chemical bonding with a corresponding wave number higher than 3000 cm −1 , while the peaks between 2000~1000 cm −1 and below 1000 cm −1 can be further attributed to Si(Al)-O vibration and Si-O-Si(Al) vibration separately [31], consistent with the FTIR spectra of typical Na-P1 zeolite with a chemical formula of Na 6 Al 6 Si 10 O 32 •12H 2 O [32]. The Na-P1-type zeolite maintains a Gismodine structure with 2D cross-open channels following [100] and [010] directions, leading to superior ion exchange and adsorption ability.…”

Section: Crystalline Structure Of Anthracite Modified Zeolite and Mag...supporting

confidence: 82%

An Evaluation of Cesium Removal from Simulated Radioactive Contaminated Soil with a Magnetized Zeolite Derived from Anthracite

Zhang,

Zhu,

et al. 2023

Applied Sciences

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The magnetized zeolite with an optimized conversion rate of 53% can be readily synthesized from industrial anthracite using a water-based method. The highly porous structure of ferromagnetism zeolite demonstrates robust magnetic properties with a magnetite content of 12–15%, satisfying adsorbent separation and recycling through magnetic cylinder rotating and vibrating separation. A cesium adsorption and removal efficiency as high as 99.92% with a corresponding adsorbent recovery ratio of up to 96.36% can be achieved for the simulated cesium-contaminated soil with a water content of 20% and a cesium content of 1% with an adsorbent-to-contaminated soil ratio of 1:2. Adsorption and magnetic separation technology with magnetized zeolite synthesized from anthracite exhibited a high cesium removal rate and zeolite recovery ratio, demonstrating promising application potential in treating radioactive waste soils and robust and economically viable engineering feasibility.

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Section: Crystalline Structure Of Anthracite Modified Zeolite and Mag...supporting

confidence: 82%

An Evaluation of Cesium Removal from Simulated Radioactive Contaminated Soil with a Magnetized Zeolite Derived from Anthracite

Zhang,

Zhu,

et al. 2023

Applied Sciences

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“…However, as shown in Figure b, the V-HAP prepared under pH = 13 showed lower activity as compared to pH 11. The addition of NaOH may have prevented the formation of HAP because of the reaction between Na and PO 4 to form NaHPO 4 , Na 2 HPO 4 , and Na 3 PO 4 . , Another possibility is that Na was doped onto the HAP structure, which could influence the doping of V into the structure. , Therefore, pH 11 was chosen as the optimum pH for the V-HAP synthesis for HMF oxidation.…”

Section: Resultsmentioning

confidence: 99%

Exploiting an Efficient and Stable Catalyst for the Selective Oxidation of 5-Hydroxymethylfurfural to 2,5-Diformylfuran by Incorporating Vanadium in the Framework of Hydroxyapatite

Patria

Kumar

Luo

et al. 2022

ACS Sustainable Chem. Eng.

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Hydroxyapatite displays immense potential in catalysis because of its properties to form doped single and multiphasic systems. In the present study, vanadium-incorporated hydroxyapatite was investigated for aerobic oxidation of 5-hydroxymethylfurfural to 2,5-diformylfuran. The amount of vanadium precursor and the pH in catalyst synthesis were significant factors in defining the catalytic properties of V-HAP. The morphologies and structures of the catalysts were well studied. Field emission scanning electron microscopy revealed different morphologies of the catalyst with varying amounts of vanadium and pH, suggesting that both these factors play a critical role in determining the catalytic properties. Through X-ray diffraction spectra, the incorporation of vanadium ions into the HAP framework by replacing phosphate ions was confirmed by the augmentation of lattice parameters and unit cell volume. The vanadium amount corresponding to x = 3 and pH 11 for the synthesis of the catalyst displayed good catalytic efficiency for HMF conversion. To further enhance the performance of the synthesized catalyst, the reaction parameters such as the temperature of reaction and catalyst loading were optimized. Under optimum reaction conditions, 78% HMF conversion with 63 and 81% DFF yield and selectivity, respectively, was observed. V-HAP (x = 3) was highly stable in nature and did not show a decrease in activity during experimental cycles, thereby showing that the incorporated vanadium did not leach out and that the catalyst was recyclable, which was also confirmed by energy-dispersive X-ray spectroscopy results. V-HAP (x = 3) was also compared with V2O5-HAP and was found to have superior catalytic properties as compared to the latter. This study contributes to the development of green and stable catalysts for biomass conversion.

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“…The difference in pore size and specific surface area in the sample is due to the characteristics of the NaOH solution, where the pores are eroded in the zeolite activation process, affecting the pore size to increase and the specific surface area to decrease as a result of several pores merging into one part [26,31]. The decrease in the specific surface area of zeolite is also caused by large pores being more dominant than tiny pores and relatively large pores forming a hierarchical connection system between pores [32].…”

Section: Figure 3 Bjh Desorption Graph Of Unactivated and Activated Z...mentioning

confidence: 99%

Effect of NaOH Concentration Toward the Characteristics of Activated Natural Zeolite from Blitar – East Java

2023

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This study discusses the activation of natural zeolite from Blitar City – East Java using NaOH solution (0.5 M and 1.0 M). Characteristics of unactivated and activated zeolites were also investigated, as well as the effect of the activator (NaOH solution) on functional groups, element composition, pore size, specific surface area, and total pore volume. FTIR spectroscopy, XRF, and gas physisorption were conducted to support the study. Experimental data showed that: (1) the major functional groups were observed at 1250-780 cm-1 in the infrared spectra, in which the unactivated and the activated zeolite were not significantly different; (2) the elemental composition of zeolite (Si and Al) tended to decrease after the activation process; (3) the pore size of the activated zeolite increased while the surface area and total pore volume decreased. Based on this study, activated zeolite (AZB-1.0) showed the optimum result: the pore size increased by 4.12847 nm, and the total pore volume did not decrease significantly by 0.04987 cc/g.

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The Effects of NaOH Concentration on the Hydrothermal Synthesis of a Hydroxyapatite–Zeolite Composite Using Blast Furnace Slag

Cited by 10 publications

References 49 publications

An Evaluation of Cesium Removal from Simulated Radioactive Contaminated Soil with a Magnetized Zeolite Derived from Anthracite

An Evaluation of Cesium Removal from Simulated Radioactive Contaminated Soil with a Magnetized Zeolite Derived from Anthracite

Exploiting an Efficient and Stable Catalyst for the Selective Oxidation of 5-Hydroxymethylfurfural to 2,5-Diformylfuran by Incorporating Vanadium in the Framework of Hydroxyapatite

Effect of NaOH Concentration Toward the Characteristics of Activated Natural Zeolite from Blitar – East Java

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