One-pot synthesis of NaA and NaP zeolite powders using agro-waste material and other low cost organic-free precursors

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

doi:10.1016/j.ceramint.2013.06.001

Cited by 44 publications

(22 citation statements)

References 15 publications

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“…In order to demonstrate how transition metals entered the skeleton, the peak shape and shift of the skeletal vibrational absorption peaks was obtained using FTIR. As shown in Figure B, in the case of NaP‐RAW zeolite adsorbent, the asymmetric stretching and in‐plane bending vibration absorption peaks of Si–O appeared at 751 and 991 cm −1 , respectively . The bending vibration band at 561 cm −1 was assigned to the out‐of‐plane connection vibration absorption peak of Si–O .…”

Section: Resultsmentioning

confidence: 93%

“…As shown in Figure 2B, in the case of NaP-RAW zeolite adsorbent, the asymmetric stretching and in-plane bending vibration absorption peaks of Si-O appeared at 751 and 991 cm −1 , respectively. 36 The bending vibration band at 561 cm −1 was assigned to the outof-plane connection vibration absorption peak of Si-O. 37 The symmetric stretching and out-of-plane bending vibration absorption peaks of Al-O appeared at 692 and 463 cm −1 , respectively.…”

Section: Synthesis Of Nap Zeolite Adsorbents Doped With Transition mentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 93%

Section: Synthesis Of Nap Zeolite Adsorbents Doped With Transition mentioning

confidence: 99%

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

et al. 2019

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“…Utilization of RHA for the preparation of NaA and NaY zeolites was reported by Tan et al Azizi and Yousefpour synthesized NaA and analcime zeolites using RHA as silica source under microwave and hydrothermal heating at 120‐180°C for 18 hours . Using RHA we have prepared NaA and NaP zeolites by hydrothermal process at 100°C for 15‐96 hours …”

Section: Introductionmentioning

confidence: 86%

Single‐step process without organic template for the formation of zeolite A from RHA

Kumar

Naskar

2019

Int J Applied Ceramic Tech

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Dice-shaped zeolite A (NaA) was prepared via direct dissolution of rice husk ash (96.5% SiO 2 ) in the presence of NaOH and sodium aluminate solution by autoclave process at 90°C/6 h without using any templating agent. The prepared particles were characterized by DTA/TG, XRD, FTIR, N 2 adsorption-desorption physisorption analysis, FESEM, and TEM. XRD results confirmed crystallization of pure NaA zeolite phase. FTIR study shows the characteristic bands at 554 cm −1 for double 4 membered ring (D4R) of NaA zeolite. The total BET surface area of the product was found to be 31.6 m 2 g −1 . FESEM and TEM images show dice shaped NaA particles of size around 1 μm which is formed via oriented crystalline aggregation of primary particles (30-40 nm). A tentative mechanism was proposed for the formation of NaA crystals through direct dissolution of rice husk ash. The synthesized NaA zeolite could be used for purification of alcohol and separation of toxic and radioactive ions from waste water via a cost-effective process. K E Y W O R D Scrystallization, microstructure, porosity, rice husk ash, zeolite A

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“…The EDX spectrum was also taken which delivers useful information about the presence of elements and their composition in the structure of electrode [39]. The curves display an IUPAC type IV isotherm in which the hysteresis loops were due to the foundation of textural mesoporosity originated from the intergrowth of the crystals [37,40]. The obtained data from this Figure demonstrates that oxygen, sodium, aluminum and silicon are presented on the structure of synthesized sample.…”

Section: Characterization Of Synthesized Naa Nanozeolitementioning

confidence: 98%

“…Alkali-metal cations as the source of hydroxide ions are needed to solubilize silicate and aluminate species and a limited structure-directing role to form cage-like structures [35]. The characteristic bands at 453 cm -1 is ascribed to the internal vibration of (Si-O-Al) bending, 717 cm -1 is related to the internal vibration of (Si, Al)-O symmetric stretching and 995 cm -1 is attributed to the internal vibration of (Si, Al)-O asymmetric stretching [37,38]. Figure 1b displays FT-IR spectrum of synthesized NaA nanozeolite.…”

Section: Characterization Of Synthesized Naa Nanozeolitementioning

confidence: 99%

Application of Synthesized NaA Nanozeolite as a Novel Supported Electrode for the Formaldehyde Electro‐catalytic Oxidation

Hassaninejad–Darzi

2018

Fuel Cells

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Nickel hydroxide doped NaA nanozeolite carbon paste electrode (Ni(OH)2‐NaA/CPE) was employed as simple and efficient sensor for electro‐catalytic oxidation and detection of formaldehyde (HCHO). For this goal, organic template free synthesis of NaA nanozeolite under room‐temperature was performed and characterized. Field emission scanning electronic microscopy (FESEM) technique exhibited the presence of spherical NaA nanozeolite morphology with particle size under 100 nm. The BET surface area and average pore diameter of synthesized NaA nanozeolite were obtained to be 3.622 × 102 m2 g−1 and 5.9 nm, respectively. Carbon paste electrode (CPE) was modified by NaA nanozeolite and then Ni2+ ions incorporated to this electrode to obtain Ni‐NaA/CPE. The values of electron transfer coefficient and mean value of catalytic rate constant for HCHO and redox sites of Ni(OH)2‐NaA/CPE were caculated to be 0.58 and 8.42 × 106 cm3 mol−1 s−1, respectively. The results indicate that Ni(OH)2‐NaA/CPE displays good electrocatalytic activity with respects to HCHO oxidation owing to its mesoporous structure and the large surface area of NaA nanozeolite. Moreover, amperometric studies exhibited that the fabricated electrode has a detection limits of 2.0 μM allowing the quantitative analysis of HCHO in the concentration range from 6.0 × 10−3 to 2.31 × 10−1mM with high sensitivity (1.6716 × 103 μA mM−1).

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One-pot synthesis of NaA and NaP zeolite powders using agro-waste material and other low cost organic-free precursors

Cited by 44 publications

References 15 publications

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

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

Single‐step process without organic template for the formation of zeolite A from RHA

Application of Synthesized NaA Nanozeolite as a Novel Supported Electrode for the Formaldehyde Electro‐catalytic Oxidation

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