Hydrothermal Synthesis of Zeolite A Using Natural Kaolin from KG. Gading Bongawan Sabah

Johnson, E. B. G.; Arshad, Sazmal Effendi; Asik, Jahimin

doi:10.3923/jas.2014.3282.3287

Cited by 18 publications

(8 citation statements)

References 13 publications

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“…The hexagonal geometry of kaolinite particles is preserved following calcination, as evidenced by micrographs of metakaolin Figure 5 (c and d). On the other hand, the metakaolin particles do not form the booklet structure [20,21].…”

Section: Sem Resultsmentioning

confidence: 97%

Investigating the Effect of Different Parameters on Physical Properties of Metakaolin-Based Geopolymers

AL-Jabar¹,

Al-Kaisy²,

Ibrahim³

2022

ETJ

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The presence of K+ ions negatively influences GP's physical properties.  W/MK ratio is the most important factor that affects GP's physical properties.  Increasing the Si/Al ratio will lead to an increase in the density of GP.  Short mixing time is necessary to achieve better GP properties.Recently, geopolymers have received widespread attention due to their ability to completely replace ordinary cement with better efficiency, lower cost, and less damage to the climatic environment. This paper aimed to prepare MK-based geopolymer cement at ambient temperature with different alkaline activators and processing parameters. XRD, PSA, DTA-TGA, SEM, and other techniques have characterized the prepared samples. ANOVA test was employed to identify the main effect of the processing parameters. Results showed that the incorporation of potassium ions has a negative effect on the physical properties of GP, in which the presence of such ions tends to decrease the density of GP. Furthermore, the apparent porosity and water absorption were increased. For Na and K, Naactivated GP, it was also concluded that the density of GP increases by increasing Si/Al ratios. Despite the Na-based GP processes having a larger density in compared to the K, Na-based ones. The results also suggested a strong effect of the W\MK ratio on physical properties, in which decreasing this ratio is necessary to achieve GP with better properties. The findings also revealed that a one-minute mixing period was sufficient for producing a homogeneous and dense GP paste.

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Section: Sem Resultsmentioning

confidence: 97%

Investigating the Effect of Different Parameters on Physical Properties of Metakaolin-Based Geopolymers

AL-Jabar¹,

Al-Kaisy²,

Ibrahim³

2022

ETJ

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“…A high hydroxide ion has been chosen in this research to increase the rate of crystallization during zeolite synthesis. [40] The result from EDX analysis shows that the kaolinite, metakaolin, and synthesized zeolites contained a comparable ratio of Si and Al. The ideal ratio allows the synthesis of zeolite A and sodalites without requiring any additional chemical as a source of Si and Al.…”

Section: Field Emission Scanning Electron Microscopy and Energy-dismentioning

confidence: 96%

Evaluation of phase transformation behaviors of zeolite and antibacterial properties against Gram‐positive and ‐negative bacteria

Ishak

Malek

Yusop

et al. 2020

J Chinese Chemical Soc

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This study deals with the synthesis of zeolite from natural kaolinite using hydrothermal treatment and evaluation of its phase transformation behaviors. The synthesized zeolites were modified with silver ion by using the ion exchange method for the enhancement of antibacterial properties. The characterizations were performed by using X-ray diffraction spectroscopy, Fouriertransform infrared spectroscopy, field emission scanning electron microscopy, and energy-dispersive X-ray. Disk diffusion technique (DDT) was used for the evaluation of the antibacterial property of the modified zeolites. This study observed the transformation of kaolinite into amorphous metakaolin after calcination treatment at 900 C and the successful reconstruction of amorphous metakaolin into synthesized crystal zeolite in the presence of sodium hydroxide as an activating agent. It was also found that the zeolite type A was produced at 100 C, while sodalites were produced at 120 and 140 C. DDT analysis revealed that the modified zeolites showed significant antibacterial capability against Escherichia coli ATCC 11229 and Staphylococcus aureus ATCC 6538. In general, the present study has proven that the zeolites can be synthesized from natural material and can be modified with silver ion to enhance their antibacterial activity.

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“…Metakaolinite and (1.0M and 3.0M) NaOH solutions were used as starting material without any additional silica to the reaction mixture [32]. NaOH is utilized as homogeneous catalyst which is a non-renewable and becomes consumable chemical in the process [21].…”

Section: Zeolizationmentioning

confidence: 99%

“…%) of kaolin before and after calcination and synthesis zeolite contains SiO2, Al2O3, Fe2O3, TiO2, MgO, CaO and K2O which obtained from XRF analysis was summarized in Table 1. Zeolite-Y is directly prepared from metakaolinite without any additional silica [8,32,36]. It is obvious that the clay is mainly composed of Si and Al who contains also iron oxide affects greatly the brightness of the product.…”

Section: Chemical and Mineralogical Analysismentioning

confidence: 99%

Synthesis and Characterization of Zeolite-Y from natural clay of Wadi Hagul, Egypt

Bahgaat

Hassan²,

Melegy

et al. 2020

Egypt. J. Chem.

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Zeolites were synthesized from alternative cheap raw material as clay minerals which used as a common source for Al2O3 and SiO2 for synthesis zeolite-Y. Synthetic zeolite-Y has many characteristics, high purity and larger cavities that distinguish it from its counterparts. This study concerned with evaluation of the viability of producing low-silica zeolite through the process of hydrothermal calcination (metakaolinization) of raw material (kaolin) from Wadi Hagul, Egypt at 800 o C for 6 h. Metakaolinite was synthesized under hydrothermal treatment with 1.0 M NaOH solution without additional any catalysts as silica source at 90 o C/2d under atmospheric pressure. Zeolite Na-Y of molar ratio of 2.23 was achieved. The Cation Exchange Capacity (CEC) test showed an impressive value of 401.09 meq/ 100 g clay for prepared zeolite-Y. The raw kaolin, metakaolin and zeolite were characterized by XRF, XRD and SEM. The results confirmed that Zeolite was successfully produced from the raw material extracted from Wadi Hagul with an ideal percentage which approximately equal to 100% of the raw material used. The synthetic zeolite-y can be applied for remediation of wastewater and polluted soil.

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Hydrothermal Synthesis of Zeolite A Using Natural Kaolin from KG. Gading Bongawan Sabah

Cited by 18 publications

References 13 publications

Investigating the Effect of Different Parameters on Physical Properties of Metakaolin-Based Geopolymers

Investigating the Effect of Different Parameters on Physical Properties of Metakaolin-Based Geopolymers

Evaluation of phase transformation behaviors of zeolite and antibacterial properties against Gram‐positive and ‐negative bacteria

Synthesis and Characterization of Zeolite-Y from natural clay of Wadi Hagul, Egypt

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