Synthesis of cashew nut-like zeolite NaP powders using agro-waste material as silica source

Bohra, Subha; Kundu, Debtosh; Naskar, Milan Kanti

doi:10.1016/j.matlet.2013.04.080

Cited by 28 publications

(24 citation statements)

References 8 publications

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“…The double ring present in the NaP zeolite backbone can be demonstrated by a band of 603 cm −1 [32]. The vibrational peaks of the infrared spectra of the two samples matched well with the typical NaP zeolite in the literature, confirming the successful synthesis of NaP zeolite [33,34]. Figure 5a,b shows the TG and DSC curves for NaP zeolite with different SiO 2 /Al 2 O 3 molar ratio.…”

Section: Sem Results Analysissupporting

confidence: 75%

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 Analysissupporting

confidence: 75%

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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“…The symmetric stretching and out‐of‐plane bending vibration absorption peaks of Al–O appeared at 692 and 463 cm −1 , respectively . Peaks in the 500‐1000 cm −1 range were the skeletal vibration bands of NaP . Owing to the hydration of zeolite, the bending and stretching vibration absorption peaks of O–H appeared at 1431, 1647, and 3627 cm −1 …”

Section: Resultsmentioning

confidence: 99%

“…38,39 Peaks in the 500-1000 cm −1 range were the skeletal vibration bands of NaP. 40 Owing to the hydration of zeolite, the bending and stretching vibration absorption peaks of O-H appeared at 1431, 1647, and 3627 cm −1 . 41 Figure 2C presents the magnified details of M-NaP zeolite adsorbents.…”

Section: Synthesis Of Nap Zeolite Adsorbents Doped With Transition Me...mentioning

confidence: 99%

In‐situ synthesis of NaP zeolite doped with transition metals using fly ash

et al. 2019

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Here, a novel approach has been proposed to synthesize NaP zeolite adsorbents doped with transition metals (M‐NaP) using the Na2SiO3 and NaAlO2 compounds extracted from fly ash via activation and stage treatment. The preparation process of M‐NaP employed the in‐situ synthesis in combination with organic complexation method. The effects of the addition amounts and valence state of transition metals on the zeolite products were investigated. The crystalline phase, morphology, and particle size of M‐NaP were characterized using X‐ray diffractometry (XRD), Scanning electron microscopy (SEM), and Laser particle size analyzer (PSD). The doping process was investigated using X‐ray photoelectron spectroscopy (XPS) and Materials Studio. The adsorption performance of M‐NaP was tested by the adsorption of Zn2+. The optimal molar ratio of n(Al2O3)/n(M) was identified as 8:1 for Co–NaP, Ni–NaP, and Fe–NaP, compared with 6:1 for Ti–NaP. The influence of transition metals on adsorption was: Co–NaP > Ni–NaP > Ti–NaP > Fe‐NaP. Due to largest surface area of Co–NaP (162.5 m2/g, five times than that of NaP‐RAW), the maximum removal rate of Zn2+ was above 99.50% at 25°C. The existence state of transition metals in M‐NaP primarily included: isomorphous substitution and balance of the skeletal charge, with the latter in majority. The simulation of Materials Studio indicates that Si at T4 was first substituted and then, Si at T3 opposite T4 was replaced when the replacement of Si in different sites occurred.

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“…Recently, natural minerals and solid waste as raw materials, such as fly ash, 9–11 metakaolin, 12 and bentonite, 13 have aroused a great interest to the cost‐effective synthesis of zeolite P. For example, by adding a small amount of NaOH and deionized water, Ji et al obtained well‐crystallized zeolite P from coal gasification coarse slag by a hydrothermal method, where the synthesis gel had to be aged for 24 h and then hydrothermally treated at 105°C for 12 h 14 . Bohra et al prepared cashew nut‐like zeolite P from agro‐waste by hydrothermal method at 100°C for 48 h 15 . Although natural minerals and solid waste as raw materials exhibit the low‐cost advantage, the solubility of silicon or aluminum sources and impurities from these materials in the hydrothermal process lead to longer crystallization time and lower crystallization purity than those of the products synthesized from pure chemical reagents.…”

Section: Introductionmentioning

confidence: 99%

Rapid synthesis of zeolite P from potassic rocks by gel‐like‐solid phase method

Yang

Guo

et al. 2021

Asia-Pacific J Chem Eng

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A facile, rapid, and energy‐saving gel‐like‐solid method was applied to prepare zeolites from natural minerals. Using potassic rocks (PRs) activated by the alkali fusion decomposition method together with silica‐alumina xerogel as silicon‐ and aluminum‐species, zeolite P has been successfully synthesized via gel‐like‐solid phase method. The effects of crystallization time (t), crystallization temperature (T), m (PRs)/m (xerogel) ratios, and n(H2O)/n (SiO2) ratios on the crystallinity and morphology of zeolite P were investigated. The optimal synthesis conditions were m (PRs)/m (xerogel) of 0.185, n(H2O)/n (SiO2) of 28.12, crystallization t of 3 h, and crystallization T of 140°C. The synthesized zeolite P featuring high crystallinity possessed spherical morphology aggregated by small grains and was applied in the ion exchange for Ca2+ and Mg2+ ions. The maximum Ca2+ and Mg2+ ions exchange capacities of zeolite P could reach 415 mgCaCO3·g−1 and 162 mgMgCO3·g−1, respectively. Compared with other published materials, the synthesized zeolite P exhibited satisfactory Ca2+ and Mg2+ ions exchange capacities. The above results demonstrated that the gel‐like‐solid phase method could shorten the crystallization t and enhance the crystallinity of zeolites synthesized from natural minerals and solid waste, showing a great potential in actual applications.

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Synthesis of cashew nut-like zeolite NaP powders using agro-waste material as silica source

Cited by 28 publications

References 8 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

In‐situ synthesis of NaP zeolite doped with transition metals using fly ash

Rapid synthesis of zeolite P from potassic rocks by gel‐like‐solid phase method

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