The increased use value of bamboo leaves as silica source for t-type zeolite synthesis

The zeolite was synthesized from rice husk ash with high silica content using the microwave heating method. In the pre-treatment step, the silica content of rice husk ash was extracted by HCl at various concentrations. Zeolite was synthesized by the reaction of rice husk ash, the aqueous solution of NaOH and Al2O3 in the flask reactor, and was treated by microwave heating at various power from 100-200 W. The crystalline phase and the characteristic structure of the product were analyzed by XRD and SEM analysis. Moreover, the surface area of the product was analyzed by BET analysis. The result shows that with 2 M HCl as an acid treatment in the pre-treatment step, the high surface area of the zeolite was obtained, i.e., 266.7 m2/g. The adsorption efficiency of the product was analyzed using methylene blue, methyl orange, and methyl red as the textile dye waste. The result shows that the adsorption efficiency of the product on the methylene blue, methyl orange, and methyl red was 94.2%, 93.89%, and 94.7%, respectively.

Section: Introductionmentioning

confidence: 99%

Synthesis of Zeolite as a Textile Dye Waste Adsorbent from Rice Husk Ash Using Microwave Heating Method

Karisma

Altway

Agustiani

et al. 2022

Synthesis of silicalite-1 zeolite using silica from elephant grass (Pennisetum purpureum)

Sundari

Setiadji

Andriani

et al. 2019

Silicalite-1 is a type of zeolite with no aluminum content and is hydrophobic. This zeolite can be synthesized from various types of silica. Elephant grass (Pennisetum purpureum) is one of the potential agricultural wastes that has a fairly high silica content that can be used for zeolite synthesis. In this study, silicalite-1 zeolite was synthesized using silica extracted from elephant grass and tetrapropylammonium bromide (TPABr) templates. Silica samples extracted from elephant grass have 71.91% amorphous SiO2 content. Silicalite-1 zeolite was synthesized with molar ratio of 1SiO2 : 0.527TPABr : 0.395Na2O : 98.45 H2O, using hyrothermal method at 180°C for 24 hours in a stainless steel-teflon lined autoclave. The resulting silicalite-1 samples were confirmed by X-Ray Diffraction (XRD) and showed 2θ which was typical for silicalite-1 i.e. 8.02°, 8.93°, 23.09°, and 23.98°. The results of Scanning Electron Microscopy (SEM) show that silicalite-1 zeolite has hexagonal crystals with 43.36 µm size as a result of the calculation using the Schrerrer method.

Synthesis of zeolite NaX using elephant grass (pennisetum purpureum) as a silica source and its characterization

Setiadji

Sundari

Aprilia

et al. 2019

Zeolite NaX is a synthetic zeolite with faujasite framework that has large pores, which it is largely used as adsorbents. Zeolite NaX was synthesized using silica (SiO2) which was extracted from elephant grass (Pennisetum purpureum). The silica was isolated from elephant grass using its ash with conventional ignition method, with NaOH as solvent. The extracted silica purity is 86.33%. Zeolite NaX was synthesized with 3.5 Na2O : Al2O3 : 2.9 SiO2 : 150 H2O as molar ratio in hydrothermal condition at 90 °C for 15 hours. Synthesized zeolite was then characterized using FTIR to confirm the formation of zeolite based on chemical bonding that appears on the spectrum, XRD to confirm the framework structure of the formed zeolite, and SEM to obtain its morphology. Based on those analysis, it is known that the result of synthesis process is zeolite with NaX crystal structure and octahedral morphology with crystal sizes range 1-5 µm.