Vol. 9 No. 2 (2010)

Mikroorganisme yang terdapat di dalam rongga mulut dapat menyebabkan penyakit pada jaringan keras dan lunak rongga mulut. Salah satu mikroorganisme tersebut adalah bakteri S. mutans yang menjadi etiologi karies gigi. Tembaga (Cu) merupakan salah satu agen kimiawi untuk mengendalikan pertumbuhan mikroorganisme. Tembaga dapat digabungkan dengan zeolit sebagai material antibakteri. Penelitian ini bertujuan mengetahui pengaruh konsentrasi Cu di dalam Cu-zeolit alam terhadap daya antibakteri pada S mutans. Penelitian dilakukan dengan menbuat 5 kelompok konsentrasi Cu-zeolit, yaitu kelompok 0,05M,…

Ekstraksi alumina dari bijih bauksit Kalimantan Barat (mengandung sekitar 45% Al2O3 dan 16% Fe2O3) telah dilakukan, menghasilkan alumina dan residu bauksit (red mud). Residu masih mengandung alumina sekitar 20% dan besi (Fe2O3) sekitar 37%. Residu selanjutnya diproses melalui pemanggangan atau pensinteran dengan campuran soda-kapur (lime-soda sinter process) pada suhu 800-1100OC. Sinter dilarutkan dalam larutan sodium karbonat encer menghasilkan larutan sodium aluminat (2NaAlO2) dan residu pelarutan. Larutan dipresipitasi menghasilkan endapan aluminium hidrat (Al(OH)3) yang dapat dimanfaatkan…

Industrial minerals, such as natural zeolite can be engineered into raw materials on manufacturing of medical products, especially as an antiseptic. Zeolite with the crystal structure characteristic could be function as an antiseptic carrier and active subtances would be saved on crystal structure of zeolite which was on certain circumstances will be work or out of the frame structure. The active substances are an inhibitor metal with low concentration and could be a toxic for microbial cell plasma. The used natural zeolite as an antiseptic carrier with inhibitor metal Cu has not yet…

The ion exchange of Cs on NH4-Zeolite which has been activated become a zeolite monocation has been conducted on natural zeolite from Bayah, Lampung, and Tasikmalaya. On these three types of zeolite, the process of ion exchange of Cs with ammonium ion was conducted at various time (from 1 hour up to 24 hours) and temperature (303 K and 323 K). Cation exchange kinetics and diffusion process on each type of zeolite was observed and calculated the parameters included diffusion coefficient and activation energy using Arrhenius formula. The study showed that diffusion coefficient from Cs-ions into…

The analysis of Cs-isotope was conducted on separation process of Cs 137 isotope using a Lampung zeolite. Analysis of Cs based on modification of ASTM E320-79 method. Modification process including a Cs separation by extraction using a TBP/OK and by direct sedimentation as CsClO4, which was subsequently applied using a zeolite. Cs-isotope measurement was conducted using spectrometer γ. The result of Cs 137 analysis through the direct sedimentation with zeolite obtained about 86,40% ± 0,1%, while the analysis of Cs-137 by extraction modification separated process which followed by catching…

MoO3/TS-1 catalyst has been proven have a higher catalityc activity rather than TS-1 on phenol hydroxylation reaction become a hydroquinone. Preparation catalyst using a impregnasi technique with ammonium molbidate as a precursor. Catalyst calcined at temperature 400-800°C and characterized by X-Ray Diffraction (XRD), pyridin adsorption, and hydrophilicity test. Calcinations temperature affects a catalyst characteristic and related to catalyst activity. MoO3/TS-1 catalyst has been calcined at temperature 400°C showed a higher hydrophilicity rather than TS-1, a faster speed reaction on phenol…