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WASTE COOKING OIL CONVERSION TO BIODEISEL CATALIZED BY EGG SHELL OF PUREBRED CHIKEN WITH ETHANOL AS A SOLVENT Tehubijuluw, Hellna; Sutapa, I Wayan; Lethulur, Mealan
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 14, ISSUE 1, February 2014
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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Abstract

The synthesis of biodiesel from the waste cooking oil was carried out using the catalyst from egg shell of purebred chiken with ethanol as a solvent. Synthesis of biodiesel was prepared in two steps, esterification and transesterification. Esterification was conducted in mol ratio of ethanol and waste cooking oil of  9:1 with H2SO4 as a catalyst. Mol ratio of ethanol and used cooking oil in the transesterification of  12:1 with the CaO catalyst of shell eggs. CaO catalyst was yielded by calcinations egg shell of purebred chicken on 1000 for two hours. Calcination product was characterized with XRD to determine of CaO. Result of biodiesel was characterized based on FTIR, H-NMR, dan ASTM (American Standard Testing of Materials). Theoretically,yielded of biodiesel was 58% and experiment was 36.779%.
ANALYSIS OF HYDROGEN ADSORPTION AND DIFFUSION ON Mg(0001) SURFACE: AN AB INITIO DFT STUDY Sutapa, I Wayan; Amunanto, Ria; Wijaya, Karna
Jurnal Sains dan Terapan Kimia Vol 4, No 1 (2010)
Publisher : Jurnal Sains dan Terapan Kimia

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Abstract

Ab initio density functional theory (DFT) calculations are performed to study the adsorption ofH2 molecules on a Mg(0001) surface. First, the adsorption energy was investigated. In thecalculation of the adsorption process of molecular hydrogen, observation showed a physicaladsorption of molecular hydrogen rather than chemisorptions.The diffusion process of atomichydrogen on Mg (0001) was also presented. Finally, we are comparing all of our calculationwith results from previous experiments.Keyword: DFT, Adsorption, Diffusion, Mg(0001), H2
KAJIAN HIDROGRAF SATUAN SINTETIK NAKAYASU UNTUK PERHITUNGAN DEBIT BANJIR RANCANGAN DI DAERAH ALIRAN SUNGAI KODINA Sutapa, I Wayan
MEKTEK Vol 7, No 1 (2005)
Publisher : MEKTEK

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Abstract

Analyse of the design discharge in the catchment area can be used by some methods, one of them is Synthetic Unit Hydrograph Nakayasu. In this method applying need presumably studied so that result got well enough. The Synthetic Unit Hydrograph Nakayasu try applied in catchment area Kodina in Central Sulawesi to look for the level of deviation of Synthetic Unit Hydrograp Nakayasu with the measured unit hydrograph. Modification of Equation of Synthetic Unit Hydrograph Nakayasu conducted by degrading basic formula the time peak (Tp) from value Tr and peak discharge (Qp) from equation T03 in the form of value ? (discharge coefficient). As the result of research show happened by the big enough deviation to nature of the basic unit hydrograph of namely for the Tp = 26% and Qp = 22,40%. So,  Synthetic Unit Hydrograph  Nakayasu cannot be used direct to calculate the design discharge in catchment area Kodina. It?s required research of a kind to Synthetic Unit Hydrograp Nakayasu to look for the coefficient  from value of Tp and Qp
RASIONALISASI POS HIDROLOGI PADA SATUAN WILAYAH SUNGAI (SWS) LAMBUNU – BUOL DENGAN METODE KAGAN Sutapa, I Wayan
MEKTEK Vol 11, No 3 (2009)
Publisher : MEKTEK

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Abstract

The aim of this research is to get post network of hydrology efficient, effective and can deputize a catchment area so that earn minimization of is expense of required for the operation and conservancy. Data the used is monthly rainfall during 10 years start from year 1997 till 2006. Method which is used in data analysis that is method of Kagan. Pursuant to result of Method analysis of Kagan for the SWS of Lambunu-Buol with amount of existing rain post in this time amount to 13 posts with mistake of calculation according to result of analysis 2,814 % obtained by distance between post 45,199 km, amountly have answered the demand of but spreading of rain post not yet fulfilled what required by Kagan, so that require to be conducted by post reposition. Existing posts will be reposition are Station of Tada, Kayu Agung, Ongka, Lalos and Air Terang
ADSORPTION CU2+ METAL ION OF PECTIN FROM “TONGKA LANGIT” BANANA’S CRUST (MUSA SPEICES VAN BALBISIANA) Sutapa, I Wayan; Dirk Siahay, Victor Petrus; Tanasale, Matheis F.J.D.P.
Indonesian Journal of Chemical Research Vol 1 No 2 (2014): Edisi Bulan Januari (Edition for January)
Publisher : Chemistry Department, Pattimura University

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Abstract

The adsorption Cu2+ metal ion of pectin from ?tongka langit? banana?s crust (Musa Speices van balbisiana) has been done. Pectin was obtained from extraction ?tongka langit? banana?s crust with HCl at temperature 90 oC during 4 hours. Pectin was produced 9.49 grams (10.41%). Identification functional group of pectin before and after adsorption use FT-IR spectrophotometer and defractometer XRD while Cu2+ metal adsorption result was analized with using AAS. Adsorption Cu2+ metal was followed adsorption isotherm Freundlich with KF value = 4.33 mg/g and n value = 0.86.
BIODIESEL PRODUCTION FROM BINTANGGUR OIL (CALLOPHYLLUM INOPHYLLUM L.) USING CALSIUM OXIDE (CAO) CATALYST Sutapa, I Wayan; Rosmawaty, Rosmawaty; Samual, Ismah
Indonesian Journal of Chemical Research Vol 1 No 1 (2013): Edisi Pertama (First Edition)
Publisher : Chemistry Department, Pattimura University

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Abstract

The research of the biodiesel from bintanggur oil (Calophyllum inophyllum L.) using calsium oxide (CaO) catalyst had been done. In this study, a two-step process was used to produce biodiesel from bintanggur oil. Initially by esterification process using H2SO4 1.25% catalyst by weight of oil and methanol with a molar ratio of 1:9 and continued by transesterification process with 1:12 (oil : methanol) with the catalyst 8 wt% CaO. The esterification and the transesterification process carried out of 2 hours and 7 nespectively at a 65 °C. The synthesis of biodiesel was analyzed by FT-IR spectrophotometer. The conversion of biodiesel is 44.49%. The biodiesels properties were caracterized by ASTM method. Results of biodiesels properties there are specific gravity of 0.8878 g/cm3, viscosity kinematic 5.572 cSt, flash point 176.5  °C, pour point 9 °C, cooper strip corrosion 1b, and Conradson carbon residue 2.469%.
COW’S FAT PROCESSING TO BIODIESEL BY NAOH AS CATALYST IN METHANOL Grace Fransina, Eirene; Sutapa, I Wayan; Hehanussa, Susan
Indonesian Journal of Chemical Research Vol 1 No 1 (2013): Edisi Pertama (First Edition)
Publisher : Chemistry Department, Pattimura University

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Abstract

The research about biodiesel produced from cow?s fat using sodium hydroxide (NaOH) as catalyst has been done.  Biodiesel produced from cow?s fat was done through transesterification process using methanol 1:12 which priory react with 0.3% NaOH as catalyst due to oil and methanol weight.  The transesterification process was conducted for 5 hours at 65°C.  Biodiesel from cow?s fat is characterisized by GC-MS and ASTM (American Society for Testing and Materials) method.  Methyl ester which produced from cow?s fat are 31.67% of stearic acid, 25.67% of palmitate acid, and 22.68% of oleate acid.  Biodisel from cow?s fat are qualified as diesel fuel and biodiesel characterisized by ASTM for specific density (0.8705 kg/m3), kinematic viscosity (4,481 mm2/s), flash point (176,5 0C), pour point (21 0C), and Conradson?s carbon residu (0.0139% wt).
PREDIKSI POTENSI ANTIKANKER SENYAWA TURUNAN XANTHON MENGGUNAKAN HUBUNGAN KUANTITATIF STRUKTUR DAN AKTIVITAS (HKSA) Male, Yusthinus; Sutapa, I Wayan; Pusung, Yulian A. D.
CHEMISTRY PROGRESS Vol 11, No 1 (2018)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.11.1.2018.27907

Abstract

ABSTRAK Telah dilakukan penelitian untuk memprediksi potensi antikanker senyawa turunan xanthon menggunakan hubungan kuantitatif struktur dan aktivitas (HKSA) (Quantitative Structure Activity Relationship-QSAR) dengan deskriptor elektronik berupa muatan bersih atom, momen dipol, polarisabilitas, energi HOMO-LUMO, dan Log P yang dihitung menggunakan metode semi empirik PM3. Hasil analisis HKSA menunjukan bahwa model persamaan HKSA terbaik adalah Log IC50 = 18,730 + (-1,042.qC1) + (1,633.qC2) + (3,369.qC3) + (1,257.qC4) + (29,759.qC8) + (53,543.qC9) + (2,337.qC10) + (-0,161.momen dipol) + (1.550.Ehomo) + (-2,919.Elumo) +(0,140.Polarisabilitas) + (0.892. Log P) (n=27; r=0,997; r2=0,993; SE=0,08530; Fhitung/Ftabel=9,1588; PRESS= 50,04021). Penelitian ini menunjukkan bahwa pusat aktif senyawa turunan xanthon terletak pada atom karbon C1, C2, C3, C4 C8, C9 dan C10 sehingga modifikasi substituen pada posisi-posisi ini akan memberikan dampak signifikan terhadap aktifitas antikanker senyawa turunan xanthon  ABSTRACT The research has been done to predict anti cancer potential of xanthon derivative compounds using Quantitative Structure Activity Relationship (QSAR) with electronic descriptor such as : atomic net charge, dipole moment, polarizability, HOMO-LUMO energy and Log P were calculated by semi-empirical PM3 method. The best QSAR model equation were determined from analysis of multiple linear regression. The result of QSAR analysis shows that best QSAR model equation is Log IC50 = 18,730 + (-1,042.qC1) + (1,633.qC2) + (3,369.qC3) + (1,257.qC4) + (29,759.qC8) + (53,543.qC9) + (2,337.qC10) + (-0,161.momen dipol) + (1.550.Ehomo) + (-2,919.Elumo) +(0,140.Polarisabilitas) + (0.892. Log P) (n=27; r=0,997; r2=0,993; SE=0,08530; Fcal/Ftable=9,1588; PRESS= 50,04021). This research also shows that active site of the xanthon derivatives is located on carbon atom C1, C2, C3, C4 C8, C9 and C10 so that the modification of the substituents in these positions will have a significant impact on the anticancer activity of xanthon derivatives. 
STUDI INVENTARISASI POTENSI EMBUNG WILAYAH SUNGAI PARIGI POSO Sutapa, I Wayan
SMARTek Vol 8, No 4 (2010)
Publisher : SMARTek

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Abstract

Tujuan studi ini untuk menginventarisasi sungai-sungai yang potensial dijadikan lokasi embung untuk memenuhi kebutuhan air penduduk di sekitarnya dan mengetahui debit yang tersedia pada sungai tersebut. Metodologi yang digunakan adalah pengumpulan data dari instansi terkait, survai lapangan, pemilhan lokasi embung dan analisis kebutuhan & ketersediaan air di sungai. Berdasarkan kriteria pemilihan lokasi embung dengan keempat aspek, nilai modifikasi bobot pertimbangan dan pertimbangan salah satu aspek saja maka disimpulkan nilai lokasi yang tertinggi adalah Embung Parigimpu. Neraca air Embung Parigimpu menunjukkan terjadi kekurangan air, baik untuk tahun dasar perencanaan (2009) maupun proyeksi sampai tahun 2025. Artinya di lokasi ini perlu dibangun embung yang berfungsi untuk menampung air saat musim penghujan dan mendistribusikannya pada saat musim kemarau.Kata Kunci : Daerah Aliran Sungai, Nilai lokasi dan neraca air
ANALISIS POTENSI EROSI PADA DAERAH ALIRAN SUNGAI (DAS) DI SULAWESI TENGAH Sutapa, I Wayan
SMARTek Vol 8, No 3 (2010)
Publisher : SMARTek

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Abstract

Tujuan penelitian ini untuk mengetahui potensi erosi yang terjadi di beberapa DAS di Sulawesi Tengah dan upaya yang perlu ditempuh untuk meningkatkan produktivitas lahan guna mendukung pertumbuhan tanaman dan menurunkan atau menghilangkan dampak negatif pengelolaan lahan. Penelitian ini dilakukan di Kabupaten Touna, Donggala, Banggai dan Kota Palu dengan memilih DAS dari setiap kabupaten secara acak. Besarnya erosi dihitung dengan metode empiris USLE dan menggunakan perangkat lunak Arcview GIS. Hasil penelitian menunjukkan bahwa klasifikasi bahaya erosi bervariasi mulai sangat ringan sampai sangat berat. Di Kabupaten Touna bahaya erosinya tergolong sangat ringan yag menunjukkan kondisi DASnya sangat baik. Di Kabupaten Donggala klasifikasi bahaya erosi sangat berat, yang kemungkinan kondisi hutan sudah kritis. Sedangkan di kabupaten yang lain bervariasi dari ringan sampai sedang