PENGARUH WAKTU HIDROTERMAL TERHADAP UKURAN PORI ZEOLIT HAM, MODIFIKASI

Fajari, Ahmad Anwaril (2006) PENGARUH WAKTU HIDROTERMAL TERHADAP UKURAN PORI ZEOLIT HAM, MODIFIKASI. Undergraduate thesis, FMIPA Undip.

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Abstract

Zeolit alam menipakan material berpori yang multiguna dengan luas per ukaan cukup besar dan termasuk dalam kelompok material mikropori. Pe anfaatan zeolit alam selama ini belum optimal khususnya pada adsorpsi senyawa/molekul dengan ukuran lebih besar 20 A sehingga zeolit alam perlu dil ukan modifikasi pada ukuran porinya. Upaya untuk memodifikasi ukuran por zeolit salah satunya dapat dilakukan melalui metode resintesis. Penyusunan ke bali struktur zeolit dan pembentukan inti kristal terjadi melalui proses hi termal. Dengan melakukan variasi waktu hidrotermal diharapkan akan be ngaruh terhadap ukuran pori zeolit hasil modifikasi. Modifikasi zeolit alam dengan metode resintesis dilakukan melalui des ksi yang menghasilkan supematan, kemudian dilakukan penambahan mol kul pengarah hingga terbentuk gel dan dilakukan proses hidrotermal. Waktu hidr tennal divariasi untuk melihat pengaruhnya terhadap ukuran pori, Inas pe ukaan, volume zeolit dan kristalinitas zeolit. Selanjutnya dilakukan proses kals nasi yang bertujuan untuk mendekomposisi molekul pengarah dan m ntapkan kerangka zeolit. Keberadaan molekul pengarah dapat dianalisis den ,an spektrofotometri infra merah, kristalinitas zeolit basil modifikasi diketahui den... difraksi sinar-X, sedangkan ukuran pori dan luas permukaan pori dite tukan dengan metode adsorpsi gas nitrogen melalui persamaan BET. Hasil analisis XRD dan spektrofotometri infra merah menunjukkan bahwa zeal t hasil modifikasi merupakan padatan kristal dan kandungan molekul pen ah dalarn zeolit telah berkurang. Ukuran pori zeolit hasil modifikasi berdasarkan analisis BET adalah 26,05 A untuk ZH-1, 31,49 A untuk ZH-2 dan 25,6 A untuk ZH-3 yang semuanya lebih besar dari ukuran pori zeolit alam seb ar 16,20 A. Luas permukaan dan volume zeolit optimum terjadi pada ZH-2 yait secara berturut-turut 54,51 m2/g dan 85,81 cm3/g. Dari penelitian ini dapat dish pulkan bahwa waktu hidrotermal optimum untuk sintesis material zat padat adal h dna ban. Natural zeolites are porous materials which multi function with large enou h surface area and included in-group of macro porous materials. Recently the xploitation of natural zeolite for has not been optimal especially to adsorb coin ounds/molecules bigger than 20 A therefore natural zeolite should be mod fled zeolite pore size. One way to modify zeolite pore size can be done thro gh resynthesis method. Rearrangement of zeolite structure and forming of cryst 1 nucleus is through a process of hydrothermal. It is expected by conducting vari tion of hydrothermal time will have an effect on pore size of zeolite result of mod fication. Natural zeolite modification with resynthesis method was carried through dest uction to produce of supernatants, then added by director molecules until it fo ed a gel and hydrothermal process was done. The variation of hydrothermal time to know the influence of pore size, surface area, volume of zeolite and crys llinity of zeolite. The following step was calcinations process which aims to deco pose director molecules and settling of zeolite structure framework. The exis nce of director molecules was characterized using infrared spectroscopy, the zeol e crystallinity was characterized using XRD, while pore size and surface area of zeolite were determined using nitrogen gas method adsorption through equ ion of BET. The result of analysis XRD and infrared spectroscopy indicated that zeol le result of modification representing crystalline solid and director molecules cont nt in zeolite have decreased. Pore size of the zeolite modification based on anal sis BET were 26.05 A, 31.49 A and 25.67 A for ZH- I, Z1-1-2 and Z1-1-3 resp ctively which was bigger than natural zeolite pore size that was 16.20 A. ZH¬2 ha optimum surface area and volume of zeolite that were 54.51 m2/g and 85.81 cm- for the later. From this research concluded that two days would be the optil urn hydrothermal time for synthesis of solid material.

Item Type:Thesis (Undergraduate)
Subjects:Q Science > QD Chemistry
Divisions:Faculty of Science and Mathematics > Department of Chemistry
ID Code:30721
Deposited By:Mr UPT Perpus 1
Deposited On:05 Nov 2011 10:10
Last Modified:05 Nov 2011 10:10

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