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All Journal Makara Journal of Science
Tresye Utari, Tresye
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok 16424, Indonesia

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KAOLIN SEBAGAI SUMBER SiO2 UNTUK PEMBUATAN KATALIS Ni/SiO2: KARAKTERISASI DAN UJI KATALIS PADA HIDROGENASI BENZENA MENJADI SIKLOHEKSANA Bakri, Bakri; Utari, Tresye; Sari, Indra Puspita
Makara Journal of Science Vol. 12, No. 1
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Kaolin as a SiO2 Source for Ni/SiO2 Catalyst Syntheses: Characterization and Application of Catalyst for Hydrogenation Benzene to Cyclohexane. Kaolin one of clay minerals has been employed as a SiO2 source and produced a mixture of two type SiO2, quartz and quartz alpha, with the amount of 60 % of kaolin used. The SiO2 produced had been diverted to silica gel and used as supporting agent for Ni/SiO2 catalyst through impregnation of Ni(NO3)2 solution to form Ka and Kb catalysts, that having surface area smaller than the silica gel. The pore size and volume of Ka catalyst is bigger than Kb catalyst. Catalytic properties of Ni/SiO2 catalysts have been investigated for benzene hydrogenation and resulting Ka catalyst had produced more cyclohexane than Kb catalyst.
PENGARUH TEKNIK POLIMERISASI EMULSI TERHADAP UKURAN PARTIKEL KOPOLI(STIRENA/BUTIL AKRILAT/METIL METAKRILAT) Budianto, Emil; Nizardo, Noverra Mardhatillah; Utari, Tresye
Makara Journal of Science Vol. 12, No. 1
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Influence of Emulsion Polymerization Techniques to Particle Size of Copoly(styrene/butyl acrylate/methyl methacrylate). In the majority of applications, particle size and particle size distribution are highly significant factors that determine the properties of a polymer dispersion, such as its flow behavior or its stability. For example, a coating material with small particle size will give smooth coating result, good adhesive strength, good water resistance and latex stability. This article describes influence of various emulsion polymerization techniques to particle size of copoly(styrene/butyl acrylate/methyl methacrylate) with mix surfactant SDBS linear chain and nonyl fenol (EO10) and initiator ammonium persulphate. DSC data, solid content and IR spectrum showed that copoly(styrene/butyl acrylate/methyl methacrylate) was produced. Batch emulsion polymerization technique gave the highest particle size i.e. 615 nm and also the highest % conversion of monomer i.e. 97%. The more concentration of monomer was seeded to initial charge gave greater particle size and greater poly dispersity index.
ANION EXCHANGE CAPACITY OF CHROMATE ON MODIFIED ZEOLITE CLINOPTILOLITE WITH HDTMA-Br AND ITS REGENERATION Wibowo, Widajanti; Utari, Tresye; Yunarti, Rika Tri
Makara Journal of Science Vol. 15, No. 1
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Zeolite Clinoptilolite from Lampung, located in South of Sumatra, had been modified with surfactant hexadecyltrimethylammonium bromide (HDTMA-Br) as chromate anion exchanger. Surfactant modified zeolite (SMZ) Clinoptilolite in particle size range of 1.5 - 2.0 mm, which contained 196.7 mmol HDTMA-Br/kg zeolite, was used for anion exchange of chromate at neutral pH. This experiment was conducted in a glass column filled with 5 gram SMZ. The breakthrough chromate exchange capacity was found 1.262 mg/g SMZ, while the total capacity was found 2.107 mg/g SMZ. The regeneration of SMZ saturated with chromate was conducted using a mixed solutions of 0.28 M Na2CO3 and 0.5 M NaOH, compared with using a solution of 0.01 M Na2S2O4. The desorption of chromate achieved 92% with the mixed solutions of Na2CO3 and NaOH and 90% with the Na2S2O4 solution. The regenerated SMZ with Na2CO3-NaOH solutions was prior washed with HCl solution to remove the carbonate from SMZ, before being used for chromate sorption again. Its breakthrough capacity was reduced to 1.074 mg/g SMZ, and to 0.724 mg/g SMZ when regenerated with Na2S2O4 solution. These results indicated that regeneration of SMZ affected its exchange capacity for anion chromate. However, it is still could be acceptable, when Na2CO3/NaOH solutions were used for the regeneration of SMZ saturated with anion chromate.
Co-Authors Bakri Bakri Destia Puteri Ananda, Destia Emil Budianto Noverra Mardhatillah Nizardo Sari, Indra Puspita Widajanti Wibowo Yoki Yulizar Yunarti, Rika Tri